JP5957650B2 - Decontamination method, dry ice driving system and decontamination system - Google Patents

Description

  The present invention relates to a decontamination method for decontaminating a decontamination target site within a predetermined range, a dry ice driving system used for the decontamination method, and a decontamination system used for the decontamination method.

  A dry ice pellet supply device that supplies pelletized dry ice, an air compressor that supplies compressed air for injecting the pelletized dry ice, and a dry ice supply device and an air compressor that are in communication with the nuclear plant. Nozzles for blasting dry ice pelletized on the surface of tools such as jigs and tools used in the atmosphere, and work for blasting dry ice on tools in an atmosphere isolated from the surrounding environment A decontamination apparatus using dry ice blasting that includes a box and a recovery device that recovers radioactive material removed from tools is disclosed. An example of a decontamination procedure using this decontamination equipment is to paint the surface of tools before use, use the tools in a contaminated atmosphere in a nuclear power plant, and then place the tools in a work box. The dry ice pelletized is blasted from the nozzle to the tools to remove the radioactive material adhering to the surface of the paint together with the paint, and the removed radioactive material is recovered by the recovery device.

JP-A-5-113494

  The decontamination apparatus disclosed in Patent Document 1 applies paint to the surface of tools such as jigs and tools, and removes radioactive substances adhering to the surface of the paint together with the paint by dry ice blasting. Does not adsorb and hold radioactive substances, and the radioactive substances attached to the surface of the paint are scattered from the paint when dry ice is sprayed by dry ice blasting, so it is not possible to recover all of the radioactive substances using the paint. . In addition, this decontamination device can only be used to remove radioactive substances attached to tools, and it is a decontamination target over a wide range of facilities that are likely to generate radioactive substances and locations that are contaminated with radioactive substances. The site cannot be efficiently decontaminated in a short time.

  It is an object of the present invention to reliably remove most of the radioactive material at a decontamination target location within a predetermined range and to perform decontamination efficiently over a wide range of decontamination target locations in a short time. It is to provide a method. Another object of the present invention is to provide a dry ice driving system for use in a decontamination method for decontaminating a decontamination target site within a predetermined range, and for use in a decontamination method for decontamination over a wide range of decontamination target sites. There is. Furthermore, another object of the present invention is a decontamination method that can be used in a decontamination method for decontaminating a decontamination target area within a predetermined range, and can efficiently decontaminate a decontamination object area over a wide range in a short time. To provide a system.

  The first premise of the present invention for solving the above problem is a decontamination method for decontaminating a predetermined range of decontamination target portions.

The first feature of the decontamination method of the present invention according to the first premise is that the decontamination method is a first decontamination paint application step in which a peeling-type decontamination paint that adsorbs and holds a radioactive substance is applied to a decontamination target location. After the coating film 1 is made by drying the decontamination paint and creating a coating film of a predetermined thickness at the decontamination target location, and after the coating film is made by the coating film first creation process, a dry ice blasting device is used. While moving the nozzle of the dry ice blasting device in an arbitrary direction, the dry ice blasting device is driven by the dry ice second driving step and the dry ice second driving step of driving dry ice pellets into the coating film by compressed air from the nozzle of the dry ice blasting device. The coating film first cutting step for cutting the coating film formed at the decontamination target site by the dry ice pellets struck into the film, and the peeling target section surrounded by the cutting site of the coating film Coating a release target segments forming step, and the dry ice first implantation step of implanting dry ice pellets into a predetermined site of the coating film peeling subject section by the compressed air from the nozzles of the dry ice blasting apparatus, the dry ice first implantation step to produce the the sublimation of the dry ice pellets implanted in the film, from the surface of the release subject section a coating film is bulging, from the release target segments of decontamination target portion peeled coating film having a predetermined area of peeling off the coating film on the decontamination object point And a peeling area creating step for creating a peeling area.

  As an example of the decontamination method having the first feature, the decontamination method moves the nozzle of the dry ice blasting device in the delamination area after the delamination area is created at the decontamination target location by the delamination area creation step. A dry ice third driving step for driving dry ice pellets into the peeling region, and a coating film second cutting step for cutting the coating film in the vicinity including the peeling region with the dry ice pellets driven into the peeling region.

  As another example of the decontamination method having the first feature, the decontamination method creates a plurality of peeling regions at the decontamination target site by driving dry ice pellets, and peels the coating film from the decontamination target site. After that, a coating film collecting step for collecting the coating film in the peeling region is included.

  As another example of the decontamination method having the first feature, the decontamination method peels off the coating film from the decontamination target site by driving dry ice pellets, and then applies the coating from the decontamination target site by the coating film recovery process. After collecting the film, the decontamination paint second application step for re-applying the decontamination paint to the decontamination target location, and the decontamination paint applied in the decontamination paint second application step is dried to the decontamination target location. And a coating film second preparation step for forming a coating film having a predetermined thickness.

  As another example of the decontamination method having the first feature, the decontamination method uses an air suction device to suck in air at a decontamination target site when the dry ice pellets are driven. An air cleaning step of removing dust contained therein using a filter;

As another example of the decontamination method having the first feature, in the decontamination method, the nozzle of the dry ice blasting device used in the dry ice first driving step is a round nozzle having a circular injection port , The nozzle of the dry ice blasting device used in the ice second driving step and the dry ice third driving step is a flat nozzle having an injection port that is long in one direction .

  As another example of the decontamination method having the first feature, the thickness dimension of the coating film is in the range of 0.3 to 1.5 mm, and the diameter of the dry ice pellet is in the range of 2 to 5 mm.

  The second premise of the present invention for solving the above problem is a decontamination method for decontaminating a predetermined range of decontamination target portions.

  The first feature of the decontamination method of the present invention based on the second premise is that the decontamination method applies a release-type decontamination paint that adsorbs and retains a radioactive substance to a decontamination target first application step. A coating film first creating step of drying the decontamination paint to form a coating film of a predetermined thickness at a decontamination target location, a through hole drilling step of drilling a through hole at a predetermined location of the coating film, and an air injection device Compressed air injection step of injecting compressed air from the nozzle of the through hole to the through hole, the coating film is bulged from the surface of the decontamination target area by the air pressure of the compressed air injected into the through hole, and the coating film is peeled off from the decontamination target area. And a peeling area creating step of creating a peeling area of a predetermined area by peeling the coating film at a decontamination target location.

  As an example of the decontamination method having the second feature, the decontamination method creates a plurality of separation regions in the decontamination target portion by injecting compressed air, and peels the coating film from the decontamination target portion. And a coating film collecting step for collecting the coating film in the peeling region.

  As another example of the decontamination method having the second feature, the decontamination method peels off the coating film from the decontamination target site by injecting compressed air, and then applies the coating from the decontamination target site by the coating film recovery process. After the film is collected, the decontamination paint second application step in which the release-type decontamination paint is applied again to the decontamination target location, and the decontamination paint applied in the decontamination paint second application step is dried to decontamination target location. And a coating film second preparation step for forming a coating film of a predetermined thickness.

  As an example of the decontamination method having the second feature, the decontamination method sucked the air at the decontamination target location by using an air suction device when jetting the compressed air in the compressed air jet process. An air cleaning step of removing dust contained in the air using a filter;

  As an example of the decontamination method having the second feature, the thickness dimension of the coating film is in the range of 0.3 to 1.5 mm, and the discharge gauge pressure in the air injection device is in the range of 0.4 to 0.8 MPa. It is in.

  As an example of the decontamination method having the second feature, the application surface of the decontamination target area where the release-type decontamination paint is applied is a flat surface, an uneven surface, or a surface having complex undulations.

  As an example of the decontamination method having the second feature, the application surface of the decontamination target portion where the release-type decontamination paint is applied is a smooth surface or a porous surface on which a large number of fine holes are formed.

As an example of the decontamination method having the first and second features, in the decontamination method, the area of the release region created by one release region creation step is in the range of 0.25 to ¹ m ² .

  As an example of the decontamination method having the first and second features, a decontamination target location is a facility where there is a risk of generation of radioactive material, or a location contaminated by radioactive material.

  A third premise of the present invention for solving the above-mentioned problem is a dry ice driving system used for a decontamination method for decontaminating a predetermined range of decontamination target portions.

The feature of the dry ice driving system of the present invention in the third premise is that the dry ice driving system is connected to the dry ice blasting device and the air suction device, and the dry ice blasting device and the air suction device to be decontaminated. It consists of jetting / suctioning means that sucks air from the decontamination target site while spraying dry ice pellets, and the air suction device is installed on the cart, the movable cart with casters, the filter installed on the cart, and the cart And a blower that allows air to flow through the filter. The injection / suction means includes a hood having a predetermined volume, a suction port of a suction hose that extends from the air suction device and is fixed to the hood, and a circular injection port. the a, a round nozzle is connected to the discharge orifice of the injection gun is replaceably secured to the hood of the dry ice blasting apparatus Has a long injection port in one direction, formed from a flat nozzle which is replaceably fixed to the connecting has been hood muzzle of the spray gun of dry ice blasting apparatus, the dry ice implantation system, the suction holding the radioactive material After creating a coating film at the location to be decontaminated with the peeling-type decontamination paint , use a flat nozzle to move the flat nozzle in any direction, and drive dry ice pellets toward the coating film by spraying and suction means At the same time, while sucking the air in the decontamination target area, the coating film is cut to form a separation target section in the decontamination target section, and by using a round nozzle, the spray coating / suction means applies the predetermined section of the coating film in the separation target section. sucking air stripping subject section with driving a dry ice pellet was bulging a coating film from the surface of the release target segments by sublimation of the dry ice pellets, it is stripped District It is to peel the coating from the.

  As an example of a dry ice driving system according to the present invention, a filter of an air suction device is installed in a cart to collect dust, and a bug is installed in the cart to collect dust flowing out of the cyclone separator. It is formed from a filter and a HEPA filter that is installed on the carriage and collects particulates contained in the air that has flowed out of the bag filter.

  As another example of the dry ice driving system according to the present invention, the air suction device is connected to the lower opening of the cyclone separator, and contains a lead shielding container for collecting dust collected by the cyclone separator, and the lower opening of the bag filter. And a lead shielding container for storing the dust collected by the bag filter.

  The fourth premise of the present invention for solving the above problem is a decontamination system used in a decontamination method for decontaminating a predetermined range of decontamination target portions.

  The feature of the decontamination system of the present invention in the fourth premise is that the decontamination system is connected to the air injection device, the air suction device, and the air injection device and the air suction device, and injects compressed air to the decontamination target location. However, the air suction device includes a movable carriage having casters, a filter installed in the carriage, and a filter installed in the carriage and air to the filter. A blower that allows flow, and a jet / suction means includes a hood of a predetermined volume, a suction port of a suction hose that extends from the air suction device and is fixed to the hood, and an air injection device that is fixed to the hood. In the decontamination system, a coating film is made at the location to be decontaminated with a peeling-type decontamination paint that absorbs and holds radioactive substances, and then the coating film is perforated by spraying and suction means. The When injecting compressed air toward the through-hole to suck the air from the simultaneous decontamination target portions, is to peel the coating from the decontamination target portion by bulging a coating film by air pressure of the compressed air.

  As an example of the decontamination system according to the present invention, a filter of an air suction device is installed in a cart to collect dust, and a bag filter is installed in the cart to collect dust flowing out of the cyclone separator. And a HEPA filter that is installed on the carriage and collects particulates contained in the air flowing out of the bag filter.

  As another example of the decontamination system according to the present invention, an air suction device is connected to the lower opening of the cyclone separator and accommodates dust collected by the cyclone separator, and the bag filter has a lower opening. And a lead shielding container for storing the dust collected by the bag filter.

  According to the decontamination method having the first feature, a peelable decontamination paint that adsorbs and holds a radioactive substance is applied to a decontamination target portion, a coating film having a predetermined thickness is formed on the decontamination target portion, and then dry ice Dry ice blasting is performed by driving dry ice pellets into a predetermined part of the coating film from the nozzle of the blasting device, and swelling the coating film at the decontamination target area by sublimation of the dry ice pellet to peel the coating film from the surface of the decontamination target area. The radioactive material adsorbed and held on the coating film (peelable decontamination paint) does not scatter when the dry ice pellets are driven into the device, and most of the radioactive material present in the decontamination target area within the specified range together with the coating film Can be reliably removed from the decontamination target location. In the decontamination method, a peeling area of a predetermined area is created by peeling the coating film (peelable decontamination paint) from the decontamination target location, and the coating area of the predetermined area is peeled off from the decontamination target location at the time of peeling the coating film Therefore, it is easy to remove the coating film, and the radioactive material adsorbed and held on the coating film can be removed from the decontamination target area in a wide area at a time. Dyeing can be performed efficiently in a short time, and decontamination does not take time and effort, and decontamination can be performed at low cost.

The decontamination method is to create a coating film by the coating film first preparation process, then move the nozzle of the dry ice blasting device in any direction, drive the dry ice pellets into the coating film, and decontamination with dry ice pellets The coating film made at the location to be decontaminated using a dry ice blasting device is created by cutting the coating film made at the location and creating the separation target area surrounded by the cut site of the coating at the location to be decontaminated. Can be cut, and a separation target section having a predetermined area can be easily formed at a decontamination target location. In the decontamination method, after creating a separation target section at a decontamination target location, a dry ice pellet is driven into a predetermined portion of the coating film in the separation target section to bulge the coating film in the separation target section and from the surface of the separation target section Since the paint film can be peeled off, the radioactive material adsorbed and retained on the paint film (peelable decontamination paint) will not be scattered when the dry ice pellets are driven in the dry ice blasting device. Most of the radioactive material present in the can be reliably removed from the separation target section. In the decontamination method, a plurality of separation target sections can be formed at a decontamination target area within a predetermined range, and the coating film can be efficiently peeled for each separation target section. Therefore, the decontamination method is adsorbed and held by the coating film (peeling type decontamination paint). The decontaminated radioactive material can be removed at once in a predetermined area for each section to be stripped, and even if the decontamination target area is wide, decontamination of the decontamination target area over a wide range can be performed efficiently in a short time. In addition, decontamination does not take time and effort, and decontamination can be performed at low cost.

  After the separation region is created at the decontamination target location by the separation region creation process, the dry ice blasting device nozzle is moved in the separation region, and the dry ice pellet is driven into the separation region, and the separation region is included by the dry ice pellet. The decontamination method of cutting the coating film in the vicinity is to cut the coating film in the vicinity (peeling-type decontamination paint) including the peeling area made in the decontamination target location using a dry ice blasting device. Thus, the coating film peeled off from the decontamination target location can be cut off, and the coating film adsorbing and holding the radioactive substance can be easily recovered from the decontamination target location. The decontamination method is to remove most of the radioactive material present in the decontamination target area from the decontamination target area by cutting out the coating film in the peeling area and collecting the coating film from the decontamination target area. can do. The decontamination method can remove the radioactive material adsorbed and retained on the coating film (peelable decontamination paint) at once in a wide area, and efficiently decontaminate the decontamination target over a wide range in a short time. In addition, decontamination does not take time and effort, and decontamination can be performed at low cost.

  A decontamination method including a coating film collecting step for recovering a coating film in the peeling area after making a plurality of peeling areas in the decontamination target area by driving dry ice pellets, By removing multiple radioactive areas from the decontamination target area within a predetermined range by creating a plurality of delamination areas at the decontamination target area within the predetermined range and collecting the coating film in these delamination areas. In addition, decontamination of a wide range of decontamination target portions can be performed efficiently in a short time, and decontamination can be performed at low cost without taking time and labor. The decontamination method collects the coating film (exfoliation-type decontamination paint) that adsorbs and holds the radioactive material from the decontamination target location, and stores the collected coating film in a predetermined manner, so that the decontamination target location is the radioactive material. Even if it is contaminated, the decontamination target portion can be reliably decontaminated.

  After removing the coating film from the decontamination target site by driving in dry ice pellets, recovering the coating film from the decontamination site through the coating film recovery process, and then applying the decontamination paint again to the decontamination site. The decontamination method of drying the paint and forming a coating film of a predetermined thickness on the decontamination target site is to remove the coating film from the decontamination target site and decontaminate the decontamination target site, and then to the decontamination target site. By applying the decontamination paint again to make a coating film, it is possible to protect the decontamination target portion from being contaminated again by the radioactive material by the coating film.

  A decontamination method that uses a filter to remove dust contained in the sucked air while sucking in air at the location to be decontaminated using an air suction device when driving dry ice. The device sucks in air at the decontamination target location and removes dust contained in the air at the decontamination target location with the filter, so that the dust at the decontamination target location is collected by the filter and scattered at the decontamination target location. Even if the dust contains a radioactive substance, secondary contamination of the radioactive substance by the dust can be prevented.

  The nozzle of the dry ice blasting device used in the dry ice first driving step is a round nozzle, and the nozzle of the dry ice blasting device used in the dry ice second driving step and the dry ice third driving step is a flat nozzle. One decontamination method uses a round nozzle in the dry ice first driving step, so that holes can be easily drilled in a predetermined portion of the coating film by dry ice pellets driven into the coating film from the round nozzle. The dry ice pellets enter between the hole and the coating area from the hole, and the coating film can be reliably bulged at the decontamination area by sublimation of the dry ice pellet. The film can be peeled off reliably. The decontamination method uses the flat nozzle in the dry ice second driving step and the dry ice third driving step, so that the coating film can be surely cut by the dry ice pellets driven into the coating film from the flat nozzle, The coating film (peeling type decontamination paint) adsorbing and holding the radioactive substance can be cut out and the coating film can be easily recovered from the decontamination target location.

  The decontamination method in which the thickness dimension of the coating film is in the range of 0.3 to 1.5 mm and the diameter of the dry ice pellet is in the range of 2 to 5 mm, the coating film has a thickness in the above range, and the coating film Even if the coating film bulges by sublimation of the dry ice pellets of the above diameter at the time of peeling, the radioactive material was adsorbed and retained while preventing the coating film from scattering due to the coating film being crushed. A coating film (peelable decontamination paint) having a predetermined area can be peeled off collectively from the decontamination target location.

  According to the decontamination method having the second feature, a release-type decontamination paint that adsorbs and holds a radioactive substance is applied to a decontamination target portion, a coating film having a predetermined thickness is formed on the decontamination target portion, and then air injection Compressed air is sprayed from the nozzle of the device into the through-hole of the coating, and the coating is bulged from the surface of the decontamination target by the compressed air pressure, and the coating is peeled off from the decontamination target. The radioactive material adsorbed and retained on the coating film (peelable decontamination paint) does not scatter when air is injected, and most of the radioactive material present in the decontamination target area within the specified range is decontaminated together with the coating film. It can be reliably removed from the target location. In the decontamination method, a peeling area of a predetermined area is created by peeling the coating film (peelable decontamination paint) from the decontamination target location, and the coating area of the predetermined area is peeled off from the decontamination target location at the time of peeling the coating film Therefore, it is easy to remove the coating film, and the radioactive material adsorbed and held on the coating film can be removed from the decontamination target area in a wide area at a time. Dyeing can be performed efficiently in a short time, and decontamination does not take time and effort, and decontamination can be performed at low cost.

  A decontamination method for creating a plurality of peeled areas at a decontamination target location by injecting compressed air, removing the coating film from the decontamination target location, and then collecting the coating film in the peeling region is within a predetermined range of decontamination. By creating a plurality of peeling areas in the target area and collecting the coating film in those peeling areas, the radioactive material adsorbed and held on the coating film can be removed from the decontamination target area in a predetermined range at once, and a wide range The decontamination of the decontamination target area can be efficiently performed in a short time, and decontamination can be performed at low cost without taking time and labor for decontamination. The decontamination method collects the coating film (exfoliation-type decontamination paint) that adsorbs and holds the radioactive material from the decontamination target location, and stores the collected coating film in a predetermined manner, so that the decontamination target location is the radioactive material. Even if it is contaminated, the decontamination target portion can be reliably decontaminated.

  After removing the coating film from the decontamination target area by injecting compressed air and recovering the coating film from the decontamination object area through the coating film recovery process, the releasable decontamination paint is applied again to the decontamination object area. The decontamination method of drying the decontamination paint to form a coating film of a predetermined thickness at the decontamination target site is that the decontamination target site is decontaminated after removing the coating film from the decontamination target site. By applying the decontamination paint again to the target portion to form a coating film, it is possible to protect the decontamination target portion from being contaminated again by the radioactive material by the coating film.

  A decontamination method that uses a filter to remove dust contained in the sucked air while sucking air at a decontamination target location using an air suction device when jetting compressed air in the compressed air jet process is When the air is sprayed, the air at the decontamination target location is sucked by the air suction device, and the dust contained in the air at the decontamination target location is removed by the filter. It is possible to prevent the dust from being scattered at the location, and even if the dust contains a radioactive substance, secondary contamination of the radioactive substance by the dust can be prevented.

  The decontamination method in which the thickness dimension of the coating film is in the range of 0.3 to 1.5 mm and the discharge gauge pressure in the air injection device is in the range of 0.4 to 0.8 MPa, the coating film has a thickness in the above range. Since the discharge gauge pressure in the air jetting device is in the above range, the coating film will not be damaged even if the coating film is exfoliated by injecting compressed air into the through-hole of the coating film. Compressed air can surely bulge the coating and prevent the coating from scattering due to the coating being damaged, while removing the coating (exfoliation type decontamination coating) of the specified area that absorbs and holds the radioactive material. It can be peeled off from the target area.

  The decontamination method in which the application surface of the decontamination target area to which the release-type decontamination paint is applied is a flat surface, an uneven surface, or a surface having complex undulations, Apply exfoliation-type decontamination paint that adsorbs and retains radioactive materials on the undulating surfaces, create coatings with a predetermined thickness on those surfaces, and then inject compressed air from the nozzles of the air injection device into the coating's through-holes. Since the coating film is bulged on the flat surface, uneven surface, and complex undulating surface, and the coating film is peeled off from the surface, the coating film (peeling type decontamination paint at the time of jetting of compressed air in the air spray device ) The radioactive material adsorbed and held on the surface is not scattered, and the majority of the radioactive material present on the flat surface, uneven surface, and complex undulation surface of the decontamination target is surely removed together with the coating film. Can do. In the decontamination method, even if the application surface of the decontamination target location is an uneven surface or a surface having complex undulations, the coating film is removed from the surface of these surfaces by injecting compressed air into the through holes of the coating film. Since it can be peeled off, decontamination of uneven surfaces and surfaces with complex undulations can be performed efficiently in a short time.

  The decontamination method in which the application surface of the decontamination target area to which the release-type decontamination paint is applied is a smooth surface or a porous surface in which a large number of fine holes are formed is a radioactive material on the smooth surface or the porous surface of the decontamination object area. After applying a release-type decontamination paint that adsorbs and holds the coating, and creating coatings with a predetermined thickness on those surfaces, the compressed air is sprayed from the nozzles of the air injection device to the through-holes of the coatings on smooth and porous surfaces. Since the coating film is bulged and the coating film is peeled off from the surface of those surfaces, the radioactive material adsorbed and held on the coating film (peeling type decontamination paint) is not scattered at the time of jetting of compressed air in the air spray device, It is possible to reliably remove most of the radioactive substance existing on the smooth surface or porous surface of the decontamination target portion together with the coating film. The decontamination method can remove the coating film from the surface of the porous surface by injecting compressed air into the through-hole of the coating film even if the application surface of the decontamination target location is a porous surface. Surface decontamination can be performed efficiently in a short time.

Since the decontamination method in which the area of the release region created by one release region creation step is in the range of 0.25 to ¹ m ² can make the release region of the area by one release region creation step, The coating film of the area can be peeled off at the same time when the coating film is peeled off, the peeling work of the coating film is easy, and the radioactive substance adsorbed and held on the coating film (peelable decontamination paint) is removed from the decontamination target location. Decontamination can be performed over a wide area at a time, decontamination of a predetermined range of decontamination target can be performed efficiently in a short time, and decontamination does not take time and effort, and decontamination at low cost Decontamination of the target part can be performed.

  The decontamination method where the decontamination target site is a facility that is likely to generate radioactive material, or is contaminated by radioactive material, is used for facilities that are likely to generate radioactive material or that are contaminated by radioactive material. After applying a release-type decontamination paint that adsorbs and holds substances, and creating a coating film of a predetermined thickness at the facility or contaminated site, a dry ice pellet is driven into the coating film from the nozzle of the dry ice blasting device, Since the coating film is bulged at the contaminated part and peeled off from the surface of the facility or the contaminated part, the radioactive material adsorbed and held on the coating film (peelable decontamination paint) when driving dry ice pellets in the dry ice blasting machine Will not scatter and most of the radioactive material present in the facility or contaminated area can be removed with the coating film. The decontamination method is to apply a release-type decontamination paint that adsorbs and retains radioactive substances to facilities that are likely to generate radioactive substances or to areas that are contaminated with radioactive substances. After that, compressed air is sprayed from the nozzle of the air spray device to the through-hole of the coating film, and the coating film is bulged at the facility and the contaminated part to peel off the coating film from the surface of the facility and the contaminated part. The radioactive material adsorbed and retained on the coating film (peelable decontamination paint) does not scatter during the air injection, and it is possible to reliably remove most of the radioactive material present in the facility and contaminated areas together with the coating film. it can. The decontamination method creates a peeled area with a predetermined area where the paint film is peeled off from the facility and the contaminated part, and the paint film of the prescribed area can be peeled off from the facility and the contaminated part at once when the paint film is peeled off. The radioactive material adsorbed and retained on the coating film (peelable decontamination paint) can be removed at once from a facility or contaminated area over a wide area, and the decontamination of the facility or contaminated area is shortened. In addition to being efficient in time, decontamination does not take time and effort, and decontamination can be performed at low cost.

  According to the dry ice driving system according to the present invention, the air in the decontamination target area is sucked in using the air suction device while the dry ice pellet is driven into the decontamination target area using the dry ice blasting device, Since the coating film is bulged by sublimation of the pellets and the coating film is peeled off from the decontamination target area, it is possible to decontaminate within the specified range together with the coating film (peeling type decontamination paint) while preventing dust from being scattered at the decontamination target area. Most of the radioactive material present at the site can be reliably removed from the site to be decontaminated. Since the dry ice driving system can peel a coating area of a predetermined area from the decontamination target area at the time of peeling of the coating film (peelable decontamination paint), it is easy to remove the coating film. The adsorbed radioactive material can be removed from the decontamination target area at once in a wide area, and the decontamination target area within a predetermined range can be efficiently decontaminated in a short time. Decontamination can be performed at low cost without much time and effort.

  In the dry ice driving system in which the filter of the air suction device is formed of a cyclone separator, a bag filter, and a HEPA filter, dust contained in the air sucked in the decontamination target area is reliably ensured by these filters when the dry ice pellets are driven. It can be removed, dust can be prevented from scattering at the decontamination target site, and even if the dust contains a radioactive substance, secondary contamination of the radioactive substance by the dust can be prevented.

  A lead shielding container for storing dust collected by the cyclone separator connected to the lower opening of the cyclone separator, and a lead shielding container for receiving dust collected by the bag filter connected to the lower opening of the bag filter. In the dry ice driving system, the dust collected by the cyclone separator or bag filter is stored in the lead shielding container, and even if the dust contains radioactive substances, the radiation is shielded by the lead shielding container. It is possible to prevent secondary contamination of radioactive materials during use of the ice driving system.

  According to the decontamination system according to the present invention, the air at the decontamination target site is sucked using the air suction device while the compressed air is jetted into the through-hole of the coating film using the air jet device, and the compressed air Since the paint film is bulged by air pressure and peeled off from the decontamination target area, it prevents dust from being scattered in the decontamination target area while keeping the paint film (peelable decontamination paint) and the decontamination target area within the specified range. Most of the radioactive materials present can be reliably removed from the decontamination site. The decontamination system can remove the coating area of a predetermined area from the decontamination target area at the same time when the coating film (peeling type decontamination paint) is peeled off. The retained radioactive material can be removed from a decontamination target area at a large area at a time, and the decontamination target area within a predetermined range can be efficiently decontaminated in a short time. Decontamination can be performed at a low cost.

  A decontamination system in which a filter of an air suction device is formed of a cyclone separator, a bag filter, and a HEPA filter reliably removes dust contained in air sucked at a decontamination target site when compressed air is injected. It is possible to prevent dust from being scattered at the decontamination target site, and even if the dust contains a radioactive substance, secondary contamination of the radioactive substance by the dust can be prevented.

  A lead shielding container for storing dust collected by the cyclone separator connected to the lower opening of the cyclone separator, and a lead shielding container for receiving dust collected by the bag filter connected to the lower opening of the bag filter. The decontamination system includes decontamination because the dust collected by the cyclone separator and bag filter is stored in the lead shielding container, and even if the dust contains radioactive substances, the radiation is shielded by the lead shielding container. It is possible to prevent cross-contamination of radioactive materials during use of the system.

Process schematic which shows an example of a decontamination coating material 1st application process. The process schematic which shows an example of a coating film 1st creation process. 3-3 front end view of FIG. The figure which shows an example of the dry ice implantation system used in a dry ice 1st implantation process, an air cleaning process, and a peeling area | region creation process. The enlarged view which shows an example of the injection and suction means of the dry ice driving system. The figure which shows an example of the round nozzle used in the drive of a dry ice pellet. Process schematic which shows an example of a dry ice 1st implantation process. Process schematic which shows an example of the peeling area | region creation process following FIG. The perspective view which shows an example of the bulging coating film. FIG. 10 is an end view taken along line 10-10 in FIG. 9; Process schematic which shows an example of the peeling area | region creation process following FIG. The process schematic which shows an example of a coating-film collection | recovery process. Process schematic which shows an example of a dry ice 2nd implantation process and an air cleaning process. Process schematic which shows an example of a coating film 1st cutting process. The figure which shows an example of the flat nozzle used in the drive of a dry ice pellet. Process schematic which shows an example of a peeling object division creation process. Process schematic which shows an example of a dry ice 3rd implantation process, an air cleaning process, and a coating film 2nd cutting process. The figure which shows the state from which the peeling area | region of the coating film was isolate | separated from the floor surface and the wall surface. The process schematic which shows an example of a through-hole drilling process. The figure which shows an example of the decontamination system used in a compressed air injection process, an air cleaning, and a peeling area | region creation process. Enlarged view showing an example of injection / suction means of the decontamination system The figure which shows an example of the injection nozzle used in a compressed air injection process. Process schematic which shows an example of a compressed air injection process. The process schematic which shows an example of the peeling area | region creation process following FIG. The perspective view which shows an example of the bulging coating film. FIG. 26 is an end view taken along line 26-26 in FIG. The process schematic which shows an example of the peeling area | region creation process following FIG. The process schematic which shows an example of a coating-film collection | recovery process. Process schematic which shows another example of a decontamination coating material 1st application | coating process. Process schematic which shows another example of a coating film 1st creation process. Process schematic which shows another example of a through-hole drilling process. Process schematic which shows another example of a compressed air injection process. The process schematic which shows another example of the peeling area | region creation process following FIG. The process schematic which shows another example of the peeling area | region creation process following FIG. The process schematic which shows an example of a coating-film collection | recovery process.

  With reference to the accompanying drawings such as FIG. 1 which is a process schematic diagram showing an example of a first decontamination paint application process, a decontamination method having the first feature of the present invention and dry ice placement used in the decontamination method The details of the system are as follows. FIG. 2 is a process schematic diagram showing an example of the first coating film forming process, and FIG. 3 is an end view taken along line 3-3 in FIG. FIG. 4 is a diagram showing an example of the dry ice driving system 15 used in the first dry ice driving process, the air cleaning process, and the separation region creating process. FIG. It is an enlarged view which shows an example. FIG. 6 is a diagram illustrating an example of a round nozzle 21A used in driving dry ice pellets.

  In FIG. 1, the floor surface 11 and the inner wall surface 12 or the outer wall surface 12 (decontamination target portion of a predetermined range) or radioactive material of a facility where the release-type decontamination paint 10 may cause a radioactive material 14 (see FIG. 3). 14 is applied to the floor 11, the inner wall 12, and the outer wall 12 (decontamination target location within a predetermined range) of the facility contaminated by 14. 1 and 2, a part of the floor surface 11 and the wall surface 12 is omitted. In FIG. 3, the state which the coating film 13 (peeling-type decontamination coating material 10) adsorbed and held the radioactive substance 14 is shown notionally.

  The peelable decontamination paint 10 can be applied not only to the floor surface 11 and the wall surface 12 of the facility, but also to the ceiling surface, pillars, and beams of the facility, and further, machines, instruments, furniture and fixtures installed in the facility. It can also be applied to any equipment such as. Moreover, it can be applied not only to the flat surface of the facility, but also to an uneven surface or a surface having complex undulations, and can also be applied to a smooth surface or a porous surface in which a large number of fine holes are formed. . The peelable decontamination paint 10 can be applied not only to a facility but also to any structure, and can also be applied to any laying object such as a paved road or interlocking.

  Facilities that may generate radioactive material 14 include nuclear facilities and medical institutions that handle radioactive materials. Nuclear power facilities include nuclear power plants, intermediate storage facilities, reprocessing plants, MOX fuel plants, fast breeder reactors, fast breeder reactor fuel plants, fast breeder reactor reprocessing plants, high-level radioactive waste final disposal facilities, etc. There is. This decontamination method is applicable not only to facilities that may generate radioactive material 14, but also to any part contaminated by radioactive material 14 (for example, areas contaminated by radioactive material 14 due to an accident) (removal of a predetermined range). It can be carried out at the location to be dyed).

  As a first decontamination method shown as an example, a decontamination paint first application step, a coating film first creation step, a dry ice first driving step, an air cleaning step, a peeling area creation step, a coating film recovery step, decontamination Each process of a coating material 2nd application process and a coating film 2nd preparation process is implemented. In the first decontamination paint application step, as shown in FIG. 1, a peelable decontamination paint 10 that adsorbs and holds the radioactive substance 14 is applied to the floor surface 11 and the wall surface 12 of the facility.

  Although there is no particular limitation on the application area of the decontamination paint 10 on the floor surface 11 and the wall surface 12, the decontamination paint 10 is usually applied to the entire area of the floor surface 11 and the wall surface 12. As shown in FIG. 1, the decontamination paint 10 is applied by any one of a brush, a roller, and a spray method. The thing to which the decontamination paint 10 is applied includes all kinds of hardened cement such as mortar and concrete, stone, wood, metal, plastic and the like.

  In the first coating film forming step, the separation-type decontamination paint 10 is applied to the entire area of the floor surface 11 and the wall surface 12, and then the paint 10 is cured for a predetermined time, the paint 10 is naturally dried, and the floor surface 11 and the wall surface 12 are applied. A coating film 13 having a predetermined thickness is made. When the decontamination paint 10 is dried, the thickness (volume) of the paint 10 decreases, and a coating film 13 having a predetermined thickness is formed on the floor surface 11 and the wall surface 12.

  In addition, the thickness of the coating film 13 can be appropriately determined according to various conditions such as the shape of the portion to which the paint 10 is applied, the state of the surface, and the degree of contamination of the radioactive substance 14. When the coating film 13 is formed on the floor surface 11 and the wall surface 12 by the coating film first creation step, as shown in FIG. Adsorbed and held by the paint 10). The floor surface and the wall surface are flat surfaces without undulations, but are either smooth surfaces or porous surfaces.

  After making the coating film 13 by the decontamination paint 10 on the floor surface 11 and the wall surface 12, the dry ice 1st drive process is implemented. In the dry ice first driving step, a dry ice driving system 15 shown in FIG. 4 is used. The dry ice driving system 15 includes a dry ice blasting device 16, an air suction device 17 (suction means), and an injection / suction means 18.

  The dry ice blast device 16 includes a dry ice blast device main body 19 that can be moved by a caster, a blast hose 20 that is connected to an injection pipe (not shown) of the device main body 19 and extends from the main body 19, and a blast hose 20 It is formed of a spray gun (not shown) that is detachably attached to the distal end portion, and a nozzle 21 (see FIG. 6) that is detachably connected to a firing port of the spray gun. The dry ice blasting device main body 16 has a built-in battery. The apparatus main body 16 injects pellet-shaped (particulate) dry ice (dry ice pellets) with compressed air.

The dry ice blasting device 16 can adjust the spray amount of dry ice pellets in the range of 10 to 100 kg / hour, and can adjust the air consumption in the range of 1 to 15 m ³ / min. The air injection pressure can be adjusted in the range of 2 to 20 bar. Moreover, the spray speed of dry ice pellets can be adjusted in the range of 200 to 1000 m / sec.

  The air suction device 17 includes a movable carriage 22 having casters, a cyclone separator 23 and a bag filter 24, a blower 25 (intake device) and a filter case 26, a suction hose 27 and a connection hose 28. . The cyclone separator 23 is mounted on a carriage 22 and is installed on a frame member of the carriage 22 via a fixing means (not shown). A suction hose 27 is connected to the cyclone separator 23.

  A lead shielding container 29 is installed below the cyclone separator 23. The lead shielding container 29 is detachably loaded on the carriage 22 and is detachably connected to the lower opening of the cyclone separator 23 via a connecting means (not shown). The cyclone separator 23 collects dust such as chips, dust, and dust. The dust collected by the cyclone separator 23 falls from the lower opening of the separator 23 and is stored in the lead shielding container 29.

  The bag filter 24 is mounted on the carriage 22 and is installed on a frame member of the carriage 22 via a fixing means (not shown). The bag filter 24 is coupled to the cyclone separator 23 via a connection hose 28. A lead shielding container 30 is installed below the bag filter 24. The lead shielding container 30 is detachably loaded on the carriage 22 and is detachably connected to the lower opening of the bag filter 24 via a connecting means (not shown). The bag filter 24 collects dust that has passed through the cyclone separator 23. The dust collected by the bag filter 24 falls from the lower opening of the bag filter 24 and is stored in the lead shielding container 30.

  The blower 25 is mounted on the carriage 22 and is installed on the carriage 22 via a fixing means (not shown). The blower 25 is connected to the bag filter 24 via the connection hose 28. The blower 25 sucks air from the suction hose 27 and causes the sucked air to flow into the cyclone separator 23, the bag filter 24, and the filter case 26. The filter case 26 is mounted on the carriage 22 and is installed on the carriage 22 via fixing means (not shown). The filter case 26 is coupled to the blower 25 via a connection hose 28. A HEPA filter (not shown) is housed in the filter case 26 so as to be detachable.

  The injection / suction means 18 is formed of a hood 31 that is shaped like a conical cylinder that expands toward the end, a suction port 32 of a suction hose 27, and a nozzle 21 that is connected to a spray port of a spray gun. The suction port 32 and the nozzle 21 of the suction hose 27 are fixed to the top of the hood 31 via fixing means (not shown). In the hood 31, the round nozzle 21A (see FIG. 6) can be replaced with a flat nozzle 21B (see FIG. 15) described later, and the flat nozzle 21B can be replaced with a round nozzle 21A.

  When the blower 25 is activated, air is sucked into the suction hose 27 of the jetting / suction means 18 as indicated by an arrow in FIG. As shown in FIG. 6, the nozzle 21 connected to the firing port of the spray gun is a round nozzle 21 </ b> A formed into a cylindrical shape having a circular spray port 33. The diameter (diameter) of the injection port 33 of the round nozzle 21A is 3 to 5 mm. In addition, the shape of the hood 31 is not limited to the conical cylinder shape which spreads toward the end, and can be an arbitrary shape such as a pyramidal cylinder shape or a rectangular cylinder shape which spreads toward the end.

In the dry ice first driving step, dry ice pellets are driven into a predetermined portion (one point of the coating film) of the coating film 13 from the jetting / suction means 18 (the round nozzle 21A of the dry ice blasting device 16) by compressed air. In addition, the injection quantity of the dry ice pellet in the dry ice 1st implantation process was 4.5 m < ³ > / min, and the injection pressure of the pellet was 0.6 MPa. However, there is no particular limitation on the spray amount and spray pressure of the dry ice pellets, and the spray amount and spray pressure can be arbitrarily determined according to each condition.

  At the time of driving the dry ice pellets, an air cleaning process is performed simultaneously with the first dry ice driving process. In the air cleaning process, the air suction device 17 is operated, and dry ice pellets are driven from above the coating film 13 toward the coating film 13, and at the same time, the air around the injection site is sprayed / suction means 18 (suction hose 27). Suction port 32). The air sucked from the suction port 32 of the suction hose 27 at the time of driving the dry ice pellets flows into the cyclone separator 23 (filter) through the suction hose 27. Dust contained in the air is collected by the cyclone separator 23 and accommodated in the lead shielding container 29.

  The air flowing out from the cyclone separator 23 flows into the bag filter 24 (filter) through the connection hose 28. Dust that reaches the bag filter 24 without being collected by the cyclone separator 23 is collected by the bag filter 24 and accommodated in the lead shielding container 30. The air that has flowed out of the bag filter 24 enters the blower 25 through the connection hose 28, passes through the blower 25, and flows into the filter case 26.

  When air flows into the filter case 26, the air flows through the HEPA filter (filter) housed in the case 26, and particulates contained in the air are collected by the HEPA filter, and clean air from which dust and particulates have been removed is obtained. The air is exhausted outside the air suction device 17. The dust stored in the lead shielding containers 29 and 30 is stored after being transferred to another lead shielding container after a predetermined amount of dust has accumulated.

  FIG. 7 is a process schematic diagram illustrating an example of the first dry ice driving process, and FIG. 8 is a process schematic diagram illustrating an example of a peeling region creation process continued from FIG. 7. FIG. 9 is a perspective view showing an example of the bulged coating film 13, and FIG. 10 is an end view taken along the line 10-10 of FIG. FIG. 11 is a process schematic diagram illustrating an example of a peeling region creation process continued from FIG. 8, and FIG. 12 is a process schematic diagram illustrating an example of a coating film recovery process. 8, 9, and 11, the hood 31 and the suction hose 27 are not shown, and only the nozzle 21 is shown. FIG. 10 conceptually shows a state in which the coating film 13 (peelable decontamination paint 10) adsorbs and holds the radioactive substance 14.

When dry ice pellets are driven into a predetermined portion of the coating film 13 while sucking air using the dry ice driving system 15, holes 34 are formed in the coating film 13 as shown in FIG. 6 due to the driving impact. The dry ice pellets enter between the floor surface 11 and the wall surface 12 and the coating film 13 (between the surface of the floor surface 11 and the wall surface 12 and the back surface of the coating film 13) through the hole 34. In the peeling region creation step, dry ice pellets that have entered between the floor surface 11 or the wall surface 12 and the coating film 13 are instantly sublimated from the solid to the gas between the floor surface 11 or the wall surface 12 and the coating film 13 (vaporization). However, the volume expands (about 800 times) to become gas (CO ² ).

As shown in FIGS. 8 and 9, the coating film 13 bulges (expands) from the floor surface 11 and the wall surface 12, swells like a balloon, and peels off from the floor surface 11 and the wall surface 12. After the coating film 13 is bulged by the gas sublimated from the dry ice pellets, the driving of the dry ice pellet is interrupted, and when a predetermined time has elapsed, the gas is released from the holes 34 of the coating film 13 to the outside air, and the bulging coating film 13. As shown in FIG. 11, a peeling area 35 having a predetermined area is formed on the floor surface 11 and the wall surface 12 (decontamination target location within a predetermined range). The area of the peeled area 35 created by one of the separation area creating step is in the range of 0.25~1m ^2.

  After the peeling area 35 having a predetermined area is formed on the floor surface 11 and the wall surface 12, the dry ice driving process and the peeling area creation process are repeated using the dry ice driving system 15, and other parts of the floor surface 11 and the wall surface 12 are repeated. A plurality of peeling regions 35 are formed, and the coating film 13 is peeled from substantially the entire area of the floor surface 11 and the wall surface 12. After peeling the coating film 13 from substantially the entire area of the floor surface 11 and the wall surface 12, in the coating film collecting step, the operator lifts the coating film 13 from the floor surface 11 and the wall surface 12, for example, as shown in FIG. The coating film 13 is rolled on the surface 11 and the wall surface 12 to collect the coating film 13 from the entire area of the floor surface 11 and the entire wall surface 12. The collected coating film 13 is stored in a lead shielding container.

In this decontamination method, the thickness dimension of the coating film 13 produced by the coating film first preparation step is in the range of 0.3 to 1.5 mm. When the thickness dimension of the coating film 13 is less than 0.3 mm, the coating film 13 is easily torn by the gas (CO ² ) from which the dry ice pellets are sublimated, and the gas is not released to the outside air from the tear of the coating film 13. The coating film 13 cannot be bulged from the wall 11 or the wall 12, and the peeling area 35 having a predetermined area cannot be formed on the floor 11 or the wall 12.

  When the thickness dimension of the coating film 13 exceeds 1.5 mm, the hardness of the coating film 13 is increased more than necessary, and the coating film 13 is expanded from the floor surface 11 and the wall surface 12 even if the driven dry ice pellets are sublimated. The peeling area 35 having a predetermined area cannot be formed on the floor surface 11 or the wall surface 12. In this decontamination method, since the thickness dimension of the coating film 13 is in the above range, the coating film 13 can be bulged from the floor surface 11 and the wall surface 12 by sublimation of the dry ice pellets that have been driven in, and the floor surface 11 and the wall surface 12 can be bulged. In addition, the peeling area 35 having a predetermined area can be reliably formed.

  In this decontamination method, the diameter of the dry ice pellet to be driven into the coating film 13 is in the range of 2 to 5 mm. If the pellet diameter is less than 2 mm, the impact applied to the coating film 13 is small even if the pellet having the diameter is driven into the coating film 13, and the hole 34 cannot be drilled in the coating film 13 having a predetermined thickness. 11 or the wall surface 12 and the coating film 13 cannot enter the dry ice pellet.

  When the diameter of the dry ice pellets exceeds 5 mm, the impact when the pellets are driven into the coating film 13 is larger than necessary, and the coating film 13 may be destroyed before the coating film 13 is peeled off. In this decontamination method, since the diameter of the dry ice pellets is in the above range, the holes 34 can be drilled in the coating film 13 by the driven pellets, and the pellets are formed between the floor surface 11 or the wall surface 12 and the coating film 13. Therefore, the peeling area 35 having a predetermined area can be reliably formed on the floor surface 11 and the wall surface 13.

  After the coating film collection step is completed (after decontamination is completed), a decontamination paint second application step and a coating film second preparation step are performed. In the second decontamination paint application process, the peelable decontamination paint 10 is applied to the floor surface 11 and the wall surface 12 of the facility by any of brushes, rollers, and spray methods, as in the first decontamination paint application process. In the coating film second creating step, after the decontamination paint 10 is applied to the floor surface 11 and the wall surface 12, the paint 10 is cured for a predetermined time, the paint 10 is naturally dried, and the floor surface 11 and the wall surface 12 are coated with a predetermined thickness. A membrane 13 is made.

  In the first decontamination method, after the peeled coating film 13 is collected, the coating film 13 having a predetermined thickness is again applied to the floor surface 11 and the wall surface 12 by the decontamination paint second coating step and the coating film second preparation step. Although it is made, the decontamination paint second application step and the coating film second preparation step can be omitted, and the decontamination work can be completed upon completion of the coating film collection step.

  In the first decontamination method, a peelable decontamination paint 10 that adsorbs and holds a radioactive substance 14 is applied to a floor surface 11 and a wall surface 12 (a decontamination target area within a predetermined range) of a facility, and the floor surface 11 and the wall surface 12 are applied. After the coating film 13 having a predetermined thickness is formed, dry ice pellets are driven into a predetermined portion of the coating film 13 from the spray / suction means 18 (the round nozzle 21A of the dry ice blasting device 16), and the coating film is applied to the floor surface 11 and the wall surface 12. Since the coating film 13 is peeled off from the surface of the floor surface 11 and the wall surface 12, the coating film 13 (peelable decontamination paint 10) is adsorbed and held when the dry ice pellets are driven in the dry ice driving system 15. The radioactive substance 14 is not scattered, and most of the radioactive substance 14 existing on the floor surface 11 and the wall surface 12 of the facility in a predetermined range together with the coating film 13 is the floor surface 11 and the wall surface 12. It can be et reliably removed.

In the decontamination method, a peeling area 35 having a predetermined area (0.25 to ¹ m ² ) obtained by peeling the coating film 13 from the floor surface 11 or the wall surface 12 is formed. Since the coating film 13 of the area can be peeled at once, the peeling operation of the coating film 13 is easy, and the radioactive substance 14 adsorbed and held on the coating film 13 (peelable decontamination paint 10) is removed from the floor surface 11 or the wall surface. 12 can be removed at a large area at a time, and decontamination of the floor surface 11 and the wall surface 12 in a predetermined range can be efficiently performed in a short time, and the decontamination does not take time and labor, and is low Decontamination can be performed at a cost.

  The decontamination method removes the coating film 13 produced by the coating film first creation process from the floor surface 11 and the wall surface 12 of the facility, and then reapplys the peelable decontamination paint 10 to the floor surface 11 and the wall surface 12. Since the decontamination paint 10 is dried to form a coating film 13 having a predetermined thickness on the floor surface 11 and the wall surface 12, the coating film 13 is removed from the floor surface 11 and the wall surface 12 to decontaminate the floor surface 11 and the wall surface 12. After the decontamination, the decontamination paint 10 is applied again to the floor surface 11 and the wall surface 12 to form a coating film 13, whereby the contamination of the decontaminated floor surface 11 and the wall surface 12 due to the radioactive substance 14 is caused by the coating film. Can be protected.

  The decontamination method uses an air suction device 17 (suction means) to suck in the air on the floor surface 11 and the wall surface 12 of the facility when driving dry ice pellets, and filters out dust contained in the sucked air (a cyclone separator). 23, bag filter 24, HEPA filter), the dust on the floor surface 11 and the wall surface 12 is collected and collected by the filters 23, 24, and the dust is scattered on the floor surface 11 and the wall surface 12. Even if the radioactive substance 14 is contained in the dust, secondary contamination of the radioactive substance 14 by the dust can be prevented.

  In the decontamination method, since the round nozzle 21A is used in the dry ice first driving step, dry ice pellets are intensively driven into one point of the coating film 13 from the round nozzle 21A, and the coating film 13 is formed by the dry ice pellet. The hole 34 can be easily drilled in the predetermined portion of the sheet, and the dry ice pellets enter the floor surface 11 or the wall surface 12 and the coating film 13 from the hole 34, and the floor surface 11 or the wall surface 12 is sublimated by the pellet sublimation. Thus, the coating film 13 can be reliably bulged, and the coating film 13 can be reliably peeled off from the surface of the floor surface 11 or the wall surface 12.

  The dry ice driving system 15 used in the decontamination method uses the dry ice blasting device 16 to drive the air suction device 17 while driving dry ice pellets into the floor surface 11 and the wall surface 12 (decontamination target portion of a predetermined range) of the facility. Is used to suck the air on the floor surface 11 and the wall surface 12 and bulge the coating film 13 by sublimation of the pellet to peel the coating film 13 from the floor surface 11 and the wall surface 12. It is possible to reliably remove most of the radioactive material 14 existing on the floor surface 11 and the wall surface 12 in a predetermined range together with the coating film 13 (peelable decontamination paint 10) from the floor surface 11 and the wall surface 12 while preventing the scattering of the water. it can.

  Since the dry ice driving system 15 can peel the coating film 13 having a predetermined area from the floor surface 11 and the wall surface 12 at the time of peeling the coating film 13, the peeling operation of the coating film 13 is easy. The adsorbed and held radioactive substance 14 can be removed from the floor surface 11 and the wall surface 12 in a wide area at a time, and the decontamination of the floor surface 11 and the wall surface 12 in a predetermined range can be efficiently performed in a short time. Decontamination does not take time and effort, and decontamination can be performed at low cost.

  FIG. 13 is a process schematic diagram illustrating an example of a second dry ice driving process and an air cleaning process, and FIG. 14 is a process schematic diagram illustrating an example of a coating film first cutting process. FIG. 15 is a diagram illustrating an example of a flat nozzle 21B of the dry ice blasting device 16 used in driving dry ice, and FIG. 16 is a process schematic diagram illustrating an example of a separation target section creating process.

  As a second decontamination method shown as another example, a decontamination paint first application step, a coating film first preparation step, a dry ice second driving step, an air cleaning step, a coating film first cutting step, a separation target section Each process of a creation process, a dry ice 1st placing process, an air cleaning process, a peeling area creation process, a coating film collection process, a decontamination paint second application process, and a coating film second creation process is performed.

  In the first decontamination paint first application step, the peelable decontamination paint 10 that adsorbs and holds the radioactive substance 14 is applied to the floor surface 11 and the wall surface 12 (decontamination target location) of the facility by using a brush, a roller, or a spray method. (See FIG. 1). In the coating film first preparation step, after applying the decontamination paint 10 to the floor surface 11 and the wall surface 12, the paint 10 is cured for a predetermined time, the paint 10 is naturally dried, and the floor surface 11 and the wall surface 12 are coated with a predetermined thickness. A membrane 13 is made (see FIG. 2). The radioactive substance 14 present on the floor surface 11 and the wall surface 12 is adsorbed and held on the coating film 13 (peelable decontamination paint 10) (see FIG. 3).

  In the dry ice second driving step, a dry ice pellet driving system 15 shown in FIG. 4 is used to drive dry ice pellets toward the coating film 13 formed on the floor surface 11 and the wall surface 12. In the dry ice second driving step, a flat nozzle 21B is used as the nozzle 21 shown in FIG. The flat nozzle 21 </ b> B has a jet port 33 that is long in one direction, and sprays dry ice pellets linearly from the jet port 33. The jet nozzle 33 of the flat nozzle 21B has a length of 50 mm and a width of 3 mm.

  In the dry ice second driving step, after the coating film 13 is formed on the floor surface 11 and the wall surface 12 in the first coating film forming step, the spray / suction means 18 of the dry ice driving system 15 (the flat nozzle of the dry ice blasting device 16) 21B) is driven in an arbitrary direction on the floor surface 11 and dry ice pellets are driven into the coating film 13.

  In addition, an air cleaning process is implemented at the time of the drive of the dry ice pellet in the dry ice 2nd drive process. In the air cleaning process, the air suction device 17 is operated, and dry ice pellets are driven from above the coating film 13 toward the coating film 13, and at the same time, the air around the injection site is sprayed / suction means 18 (suction hose 27). Suction port 32).

  In the coating film first cutting step, the coating film 13 is cut by moving the flat nozzle 21B while continuously driving dry ice pellets. When dry ice pellets are linearly driven into the coating film 13 from the flat nozzle 21B, the coating film 13 is weakened at low temperature due not only to the impact of the pellets but also due to a rapid local temperature drop and thermal shrinkage difference due to the pellets. The cleavage site 36 is formed in the coating film 13 as shown in FIG.

  In the separation target section creating step, as shown in FIG. 16, a separation target section 37 surrounded by a cutting site 36 obtained by cutting the coating film 13 is formed on the floor surface 11. In FIG. 16, the separation target section 37 is formed on the floor surface 11, but the separation target section 37 may be formed on the wall surface 12.

  After the separation target section 37 is formed by the separation target section creation process, the first dry ice driving step is performed. In the dry ice first driving step, after the flat nozzle 21B is replaced with the round nozzle 21A, the dry ice pellets are separated from the spraying / suction means 18 (the round nozzle 21A of the dry ice blasting device 16) by the compressed air in the separation target section 37. It is driven into a predetermined part (one point of the coating film) of the coating film 13 (see FIG. 7).

  At the time of driving the dry ice pellets, an air cleaning process is performed. In the air cleaning process, the air suction device 17 is operated, and dry ice pellets are driven from above the coating film 13 toward the coating film 13, and at the same time, the air around the injection site is sprayed / suction means 18 (suction hose 27). Suction port 32).

  When dry ice pellets are driven into a predetermined portion of the coating film 13 in the separation target section 37 while sucking air using the dry ice driving system 15, holes 34 are drilled in the coating film 13 due to the driving impact ( 8 and 9), the pellets enter between the floor surface 11 and the wall surface 12 and the coating film 13 through the hole 34.

In the exfoliation region creation step, the dry ice pellets instantaneously sublimate (vaporize) from solid to gas between the floor surface 11 or the wall surface 12 and the coating film 13, and the volume expands to become gas (CO ² ). The coating film 13 bulges from the floor surface 11 and the wall surface 12, and the coating film 13 peels off from the floor surface 11 and the wall surface 12 (see FIGS. 8, 9, and 10). When a predetermined time elapses, the gas is released from the hole 34 of the coating film 13 to the outside air, the bulging coating film 13 is deflated, and a peeling area 35 having a predetermined area is created in the separation target section 37 (see FIGS. 11 and 12). .

  After the peeling area 35 having a predetermined area is formed in the separation target section 37 of the floor surface 11 or the wall surface 12, the dry ice driving system 15 is used, and the dry ice driving process and the separation area creating process are further performed in the separation target section 37. Repeatedly, a plurality of peeling regions 35 are formed in other parts of the separation target section 37, and the coating film 13 is peeled from substantially the entire area of the separation target section 37. After peeling the coating film 13 from substantially the entire area of the separation target section 37, in the coating film collecting step, the operator rolls up the coating film 13 from the separation target section 37 and rolls up the coating film 13 in the separation target section 37. The coating film 13 is collected from the entire section 37.

  The thickness dimension of the coating film 13 made by the coating film first creating step is in the same range of 0.3 to 1.5 mm as that of the first decontamination method. Moreover, the diameter of the dry ice pellets driven into the coating film 13 is in the same range of 2 to 5 mm as that of the first decontamination method. After the coating film recovery process is completed, the dry ice second driving process, the air cleaning process, the coating film first cutting process, the peeling target section creating process, the dry ice first driving process, the air cleaning process, the peeling area creating process, the coating Each step of the membrane recovery step is repeated, and the coating 13 on the entire floor 11 and the entire wall 12 is peeled off and recovered.

  After peeling and collecting the coating 13 on the entire area of the floor 11 and the wall 12, the decontamination paint second application step and the coating film second preparation step are carried out. The peelable decontamination paint 10 is applied to the floor surface 11 or the wall surface 12 by either a roller or a spray method, and the coating material 10 is cured for a predetermined time to form a coating film 13 having a predetermined thickness on the floor surface 11 and the wall surface 12. The decontamination paint second application step and the coating film second preparation step can be omitted, and the decontamination work can be completed by completing the peeling and recovery of the coating film 13 over the entire floor surface 11 and the entire wall surface 12.

  In addition to the effects of the first decontamination method, the second decontamination method has the following effects. In the second decontamination method, dry ice pellets are sprayed from the flat nozzle 21B of the dry ice blasting device 16, and the pellets are formed on the floor surface 11 and the wall surface 12 (decontamination target area within a predetermined range) of the facility. The film 13 can be cut, and the separation target section 37 having a predetermined area can be easily formed on the floor surface 11 or the wall surface 12.

  In this decontamination method, after a separation target section 37 is formed on the floor surface 11 or the wall surface 12, dry ice pellets are driven into a predetermined portion of the coating film 13 in the separation target section 37 to bulge the coating film 13 in the separation target section 37. Since the coating film 13 can be peeled off from the surface of the separation target section 37, the radioactive substance 14 adsorbed and held on the coating film 13 (peeling-type decontamination paint 10) does not scatter when the pellets are driven. Most of the radioactive substance 14 existing in the separation target section 37 together with the coating film 13 can be reliably removed from the separation target section 37.

  In this decontamination method, a plurality of separation target sections 37 can be formed on the floor surface 11 and the wall surface 12 of the facility, and the coating film 13 can be efficiently peeled for each separation target section 37. The radioactive substance 14 adsorbed and held by the paint 10) can be removed at a predetermined area for each separation target section 37 at a time, and even if the floor surface 11 and the wall surface 12 are wide, a predetermined range of the floor surface 11 can be obtained. In addition, it is possible to efficiently decontaminate the wall surface 12 in a short time, and it is possible to perform decontamination at a low cost without taking time and labor for decontamination.

  FIG. 17 is a process schematic diagram showing an example of the dry ice third driving process, the air cleaning process, and the coating film second cutting process. FIG. 18 shows the peeling region 35 of the coating film 13 from the floor surface 11 and the wall surface 12. It is a figure which shows the state isolate | separated. As a third decontamination method shown as another example, a decontamination paint first application step, a coating film first creation step, a dry ice first implantation step, an air cleaning step, a release region creation step, and a dry ice third implantation Each process of a process, an air cleaning process, a coating-film 2nd cutting process, a coating-film collection | recovery process, a decontamination coating material 2nd application process, and a coating-film 2nd creation process is implemented.

  In the first decontamination paint first application step, the peelable decontamination paint 10 that adsorbs and holds the radioactive substance 14 is applied to the floor surface 11 and the wall surface 12 (decontamination target location) of the facility by using a brush, a roller, or a spray method. (See FIG. 1). In the coating film first preparation step, after applying the decontamination paint 10 to the floor surface 11 and the wall surface 12, the paint 10 is cured for a predetermined time, the paint 10 is naturally dried, and the floor surface 11 and the wall surface 12 are coated with a predetermined thickness. A membrane 13 is made (see FIG. 2). The radioactive substance 14 present on the floor surface 11 and the wall surface 12 is adsorbed and held on the coating film 13 (peelable decontamination paint 10) (see FIG. 3).

  After making the coating film 13 by the decontamination paint 10 on the floor surface 11 and the wall surface 12, the dry ice 1st drive process is implemented. In the dry ice first driving step, the dry ice driving system 15 shown in FIG. 4 is used, and dry ice pellets are applied to the coating film 13 from the jetting / suction means 18 (the round nozzle 21A of the dry ice blasting device 16) by compressed air. It is driven into a site (one point of the coating film) (see FIG. 7).

  At the time of driving the dry ice pellets, an air cleaning process is performed. In the air cleaning process, the air suction device 17 is operated, and dry ice pellets are driven from above the coating film 13 toward the coating film 13, and at the same time, the air around the injection site is sprayed / suction means 18 (suction hose 27). Suction port 32).

  When dry ice pellets are driven into a predetermined portion of the coating film 13 while sucking air using the dry ice driving system 15, holes 34 are formed in the coating film 13 due to the driving impact (see FIGS. 8 and 9). The pellets enter between the floor surface 11 and the wall surface 12 and the coating film 13 through the holes 34.

In the exfoliation region creation step, the dry ice pellets instantaneously sublimate (vaporize) from solid to gas between the floor surface 11 or the wall surface 12 and the coating film 13, and the volume expands to become gas (CO ² ). The coating film 13 bulges from the floor surface 11 and the wall surface 12, and the coating film 13 peels off from the floor surface 11 and the wall surface 12 (see FIGS. 8, 9, and 10). When a predetermined time elapses, the gas is released from the holes 34 of the coating film 13 to the outside air, the bulging coating film 13 is deflated, and a peeling area 35 having a predetermined area is created (see FIG. 11).

  After the peeling area 35 is formed by the peeling area creation process, a dry ice third driving process is performed. In the dry ice third driving step, the dry ice driving system 15 shown in FIG. 4 is used, the round nozzle 21A is replaced with the flat nozzle 21B, and then dry ice pellets are driven toward the peripheral portion 38 of the peeling region 35.

  In the dry ice third driving step, the spray / suction means 18 (the flat nozzle 21B of the dry ice blasting device 16) of the dry ice driving system 15 is moved along the peripheral edge 38 of the peeling region 35 (in any direction) Dry ice pellets are driven into the coating 13. In addition, an air cleaning process is performed at the time of driving dry ice pellets in the third dry ice driving process. In the air cleaning process, the air suction device 17 is operated, and dry ice pellets are driven from above the coating film 13 toward the coating film 13, and at the same time, air in the peripheral portion 38 of the peeling region 35 is ejected and sucked by the suction / suction means 18 ( Suction is performed by the suction port 32) of the suction hose 27.

  In the coating film second cutting step, the coating film 13 is cut by moving the flat nozzle 21 </ b> B along the peripheral edge 38 of the peeling region 35 while continuously driving dry ice pellets. When dry ice pellets are linearly driven into the coating film 13 from the flat nozzle 21B, the coating film 13 is weakened at low temperature due not only to the impact of the pellets but also due to a rapid local temperature drop and thermal shrinkage difference due to the pellets. As shown in FIG. 17, the cleavage site 36 is formed at the peripheral portion 38 of the peeling region 35. When the coating film 13 is cut along the peripheral portion 38 of the peeling region 35, as shown in FIG. 18, the peeling region 35 surrounded by the cutting part 36 is the floor surface 11 or the wall surface 12 (other parts of the coating film 13). Separated from.

  After separating the peeling area 35 from the floor surface 11 and the wall surface 12 by the coating film second cutting process, in the coating film collecting process, the operator rolls up the coating film 13 in the peeling area 35 and rolls and collects the coating film 13. . In addition, the thickness dimension of the coating film 13 produced by the coating film 1st preparation process exists in the range of 0.3-1.5 mm same as that of the 1st decontamination method. Moreover, the diameter of the dry ice pellets driven into the coating film 13 is in the same range of 2 to 5 mm as that of the first decontamination method.

  In the third decontamination method, a dry ice driving system 15 is used, and a dry ice first driving process, an air cleaning process, a peeled area creating process, a dry ice third driving process, an air cleaning process, and a coating film second cutting process. The coating film recovery process is repeated to peel and recover the coating film 13 from the entire area of the floor 11 and the entire wall 12. After the coating film 13 is peeled and recovered from the entire area of the floor 11 and the wall surface 12, the decontamination paint second application process and the coating film second preparation process are performed. The peelable decontamination paint 10 is applied to the floor surface 11 or the wall surface 12 by either a roller or a spray method, and the coating material 10 is cured for a predetermined time to form a coating film 13 having a predetermined thickness on the floor surface 11 and the wall surface 12. The decontamination paint second application step and the coating film second preparation step can be omitted, and the decontamination work can be completed by completing the peeling and recovery of the coating film 13 over the entire floor surface 11 and the entire wall surface 12.

  The third decontamination method has the following effects in addition to the effects of the first decontamination method. In the third decontamination method, after the separation region 35 is formed on the floor surface 11 and the wall surface 12 (decontamination target portion within a predetermined range) by the separation region creation step, the jetting / sucking means 18 ( While moving the flat nozzle 21B) of the dry ice blasting device 16, the dry ice pellets are driven into the peeling region 35, and the coating film 13 at the peripheral edge 35 of the peeling region 35 (the vicinity including the peeling region 35) is cut by the pellets. Thus, the coating film 13 peeled off from the floor surface 11 and the wall surface 12 can be easily cut off, and the coating film 13 (peelable decontamination paint 10) that adsorbs and holds the radioactive substance 14 is removed from the floor surface 11 and the wall surface 12. It can be easily recovered.

  In this decontamination method, after forming the peeling area 35 on the floor surface 11 and the wall surface 12, the dry ice pellets are driven into a predetermined portion of the coating film 13 in the peeling area 35 to cut the coating film 13, and the coating of the peeling area 35 is performed. Since the film 13 can be peeled and collected, the radioactive substance 14 adsorbed and held on the coating film 13 (peeling-type decontamination paint 10) does not scatter when the pellets are driven, and the peeling region 35 together with the coating film 13 is not scattered. Most of the radioactive substance 14 present in the film can be reliably removed from the peeling region 35.

  This decontamination method makes it possible to create a plurality of peeling regions 35 on the floor surface 11 and the wall surface 12 of the facility, and to efficiently peel and collect the coating film 13 for each peeling region 35. The radioactive substance 14 adsorbed and held by the dyed paint 10) can be removed at a predetermined area for each peeling region 35 at a time, and even if the floor surface 11 and the wall surface 12 are wide, a predetermined range of the floor surface 11 In addition, it is possible to efficiently decontaminate the wall surface 12 in a short time, and it is possible to perform decontamination at a low cost without taking time and labor for decontamination.

  With reference to the accompanying drawings such as FIG. 19 which is a process schematic diagram showing an example of a through-hole drilling process, details of the decontamination method having the second feature of the present invention and the decontamination system used for the decontamination method are shown. The explanation is as follows. FIG. 20 is a view showing an example of a decontamination system used in the compressed air injection step, the air cleaning, and the separation region creation step, and FIG. 21 is an enlarged view showing an example of an injection / suction unit of the decontamination system. It is. FIG. 22 is a diagram illustrating an example of an injection nozzle used in the compressed air injection process. In addition, the process schematic of a decontamination paint 1st application process uses FIG. 1, and the process schematic of a coating film 1st production process uses FIG.

  In the same way as the decontamination method of FIG. 1, the peelable decontamination paint 10 is a facility floor surface 11 and an inner wall surface 12 or an outer wall surface 12 (a decontamination target location within a predetermined range) or a facility where there is a risk of generation of a radioactive substance 14. It is applied to the floor surface 11, the inner wall surface 12 and the outer wall surface 12 (decontamination target location within a predetermined range) of the facility contaminated by the radioactive substance 14. This decontamination method (decontamination system) is not limited to facilities where radioactive substances 14 may be generated, but also every part contaminated by radioactive substances 14 (for example, areas contaminated by radioactive substances 14 due to accidents) (predetermined) It can be carried out at a decontamination target area).

  The decontamination method uses a decontamination system to be described later, a decontamination paint first application step, a coating film first creation step, a through-hole drilling step, a compressed air injection step, an air cleaning step, a release region creation step, a coating layer Each process of a collection | recovery process, a decontamination coating material 2nd application process, and a coating film 2nd creation process is implemented. In the first decontamination paint application step, the peelable decontamination paint 10 that adsorbs and holds the radioactive substance 14 is applied to the floor surface 11 and the wall surface 12 of the facility (in FIG. 1).

  There is no particular limitation on the application area of the release-type decontamination paint 10 on the floor surface 11 and the wall surface 12, but the decontamination paint 10 is usually applied to the entire area of the floor surface 11 and the wall surface 12. The decontamination paint 10 is applied by any one of a brush, a roller, and a spray method. The thing to which the decontamination paint 10 is applied includes all kinds of hardened cement such as mortar and concrete, stone, wood, metal, plastic and the like.

  In the first coating film forming step, the separation-type decontamination paint 10 is applied to the entire area of the floor surface 11 and the wall surface 12, and then the paint 10 is cured for a predetermined time, the paint 10 is naturally dried, and the floor surface 11 and the wall surface 12 are applied. A coating film 13 having a predetermined thickness is made. When the decontamination paint 10 is dried, the thickness (volume) of the paint 10 decreases, and a coating film 13 having a predetermined thickness is formed on the floor surface 11 and the wall surface 12.

  In addition, the thickness of the coating film 13 can be appropriately determined according to various conditions such as the shape of the portion to which the paint 10 is applied, the state of the surface, and the degree of contamination of the radioactive substance 14. When the coating film 13 is formed on the floor surface 11 and the wall surface 12 by the coating film first creation step, the radioactive substance 14 existing on the floor surface 11 and the wall surface 12 is adsorbed and held by the coating film 13 (peelable decontamination paint 10). (Supported in FIG. 3). The floor surface 11 and the wall surface 12 are flat surfaces having no irregularities or undulations, but are either smooth surfaces or porous surfaces.

  After making the coating film 13 by the decontamination paint 10 on the floor surface 11 and the wall surface 12, a through-hole drilling process is implemented. In the through-hole drilling step, cylindrical or pointed drilling tools 39A and 39B are used, and a through-hole 40 that penetrates the coating film 13 to a predetermined portion of the coating film 13 and reaches the floor surface 11 and the wall surface 12 is drilled. . When the cylindrical drilling tool 39A is used, the tip of the tool 39A is pressed substantially perpendicularly to the coating film 13, and the coating film 13 is cut out to form a circular through hole 40. When the pointed drilling tool 39 </ b> B is used, the tip of the tool 39 </ b> B is pierced substantially perpendicularly to the coating film 13, and a plurality of through holes 40 are formed in the coating film 13.

  Note that the injection nozzle 47 of the air compressor 42 of the decontamination system 41 may be used as a drilling tool. In this case, the tip of the spray nozzle 47 is pressed substantially perpendicularly to the coating film 13, and the coating film 13 is cut out to form a circular through hole 40. Moreover, in the through-hole drilling step, a plurality of through-holes 40 may be drilled in advance at positions of the coating film 13 that are spaced apart from each other by a predetermined interval (separation interval of each through-hole 40: 50 to 100 cm).

  After the through-hole 40 is drilled in the coating film 13, a compressed air injection process is performed. In the compressed air injection process, a decontamination system 41 shown in FIG. 20 is used. The decontamination system 41 includes an air compressor 42 (air injection device), an air suction device 43, and injection / suction means 44. The air compressor 42 is connected to an air compressor main body 45 that can be moved by a caster, an air hose 46 that is connected to an injection pipe (not shown) of the compressor main body 45 and extends from the main body 45 to the outside, and is attached to and detached from the tip of the air hose 46. An injection gun (not shown) that is detachably mounted, and an injection nozzle 47 (see FIG. 22) that is detachably connected to a firing port of the injection gun are formed.

The air compressor main body 45 has a built-in battery. The air compressor body 45 injects compressed air having a predetermined discharge gauge pressure. The air compressor main body 45 can adjust the discharge gauge pressure in a range of 0.4 to 0.8 MPa, and can adjust the discharge air amount in a range of ³ to 6 m ³ / min.

  The air suction device 43 includes a movable carriage 48 having casters, a cyclone separator 49 and a bag filter 50, a blower 51 (intake device) and a filter case 52, a suction hose 53, and a connection hose 54. . The cyclone separator 49 is mounted on a carriage 48 and is installed on a frame member of the carriage 48 via a fixing means (not shown). A suction hose 53 is connected to the cyclone separator 49.

  A lead shielding container 55 is installed below the cyclone separator 49. The lead shielding container 55 is detachably loaded on the carriage 48 and is detachably connected to the lower opening of the cyclone separator 49 via a connecting means (not shown). The cyclone separator 49 collects dust such as chips, dust, and dust. The dust collected by the cyclone separator 49 falls from the lower opening of the separator 49 and is stored in the lead shielding container 55.

  The bag filter 50 is mounted on a carriage 48 and is installed on a frame member of the carriage 48 via a fixing means (not shown). The bag filter 50 is connected to a cyclone separator 49 via a connection hose 54. A lead shielding container 56 is installed below the bag filter 50. The lead shielding container 56 is detachably mounted on the carriage 48 and is detachably connected to the lower opening of the bag filter 50 via a connecting means (not shown). The bag filter 50 collects dust that has passed through the cyclone separator 49. The dust collected by the bag filter 50 falls from the lower opening of the bag filter 50 and is stored in the lead shielding container 56.

  The blower 51 is mounted on the carriage 48 and is installed on the carriage 48 via a fixing means (not shown). The blower 51 is coupled to the bag filter 50 via a connection hose 54. The blower 51 sucks air from the suction hose 53 and causes the sucked air to flow into the cyclone separator 49, the bag filter 50, and the filter case 52. The filter case 52 is mounted on the carriage 48 and is installed on the carriage 48 via a fixing means (not shown). The filter case 52 is coupled to the blower 51 via a connection hose 54. A HEPA filter (not shown) is accommodated in the filter case 52 so as to be detachable.

  The injection / suction means is formed of a hood 57 formed in a conical cylindrical shape that widens toward the end, a suction port 58 of the suction hose 53, and a spray nozzle 47 connected to the spray port of the spray gun. The suction port 34 and the injection nozzle 23 of the suction hose 29 are fixed to the top of the hood 33 via fixing means (not shown). When the blower 51 is activated, air is sucked into the suction hose 53 of the jetting / suctioning means as indicated by an arrow in FIG. As shown in FIG. 22, the injection nozzle 47 connected to the injection port of the injection gun is a round nozzle formed in a cylindrical shape having a circular injection port 59. The diameter (diameter) of the injection port 59 of the injection nozzle 47 is 2 to 5 mm. Note that the shape of the hood 57 is not limited to a conical cylindrical shape that is widening toward the end, and can be any shape such as a pyramidal tubular shape that is widening toward the end or a rectangular tubular shape.

In the compressed air injection step, compressed air is injected from the injection / suction means (the injection nozzle 47 of the air compressor 42) toward the through hole 40 formed in the coating film 13. The discharge gauge pressure of the air compressor 42 can be adjusted in a range of 0.4 to 0.8 MPa according to each condition, and the discharge air amount of the air compressor 42 is adjusted in a range of ³ to 6 m ³ / min. be able to.

  At the time of jetting compressed air, an air cleaning process is performed simultaneously with the compressed air jetting process. In the air cleaning process, the air suction device 43 is operated, and compressed air is jetted from above the coating film 13 toward the through hole 40. At the same time, as shown by arrows in FIG. The air in the target area) is sucked by the jet / suction means (suction port 58 of the suction hose 53). The air sucked from the suction port 58 of the suction hose 53 during the injection of the compressed air flows into the cyclone separator 49 (filter) through the suction hose 53 as shown by an arrow in FIG. The dust contained in the air is collected by the cyclone separator 49 and accommodated in the lead shielding container 55.

  The air flowing out from the cyclone separator 49 flows into the bag filter 50 (filter) through the connection hose 54. Dust that reaches the bag filter 50 without being collected by the cyclone separator 49 is collected by the bag filter 50 and accommodated in the lead shielding container 56. The air flowing out from the bag filter 50 enters the blower 51 through the connection hose 54, passes through the blower 51, and flows into the filter case 52.

  When the air flows into the filter case 52, the air flows through the HEPA filter (filter) housed in the case 52, particulates contained in the air are collected by the HEPA filter, and clean air from which dust and particulates have been removed is removed. The air is exhausted outside the air suction device 43. The dust contained in the lead shielding containers 55 and 56 is transferred to another lead shielding container and stored after a predetermined amount of dust is accumulated.

  FIG. 23 is a process schematic diagram illustrating an example of a compressed air injection process, and FIG. 24 is a process schematic diagram illustrating an example of a separation region creation process continued from FIG. FIG. 25 is a perspective view showing an example of the bulged coating film 13, and FIG. 26 is an end view taken along line 26-26 of FIG. FIG. 27 is a process schematic diagram illustrating an example of a peeling region creation process continued from FIG. 25, and FIG. 28 is a process schematic diagram illustrating an example of a coating film collection process. 24, 25, and 27, the illustration of the hood 57 and the suction hose 53 is omitted, and only the injection nozzle 47 is shown. In FIG. 26, the coating film 13 (peelable decontamination paint 10) adsorbs the radioactive substance 14. The held state is conceptually shown.

  When the compressed air is injected into the through hole 40 formed in the coating film 13 while sucking air using the decontamination system 41, the compressed air passes through the through hole 40 and the floor surface 11 or the wall surface 12 and the coating film 13. (Between the surface of the floor surface 11 or the wall surface 12 and the back surface of the coating film 13). In the separation region creation step, the air pressure of the compressed air acts between the floor surface 11 or the wall surface 12 and the coating film 13 and is applied by the air pressure of the compressed air that has entered between the floor surface 11 or the wall surface 12 and the coating film 13. The film 13 bulges (expands) from the floor surface 11 and the wall surface 12, and the coating film 13 expands like a balloon and gradually peels off from the floor surface 11 and the wall surface 12.

After the coating film 13 bulges due to the air pressure of the compressed air, the injection of the compressed air is interrupted, and when a predetermined time elapses, the air is discharged from the through holes 40 of the coating film 13 to the outside air, and the bulging coating film 13 is deflated. 27, a peeling area 60 having a predetermined area is formed on the floor surface 11 or the wall surface 12 (a predetermined range of decontamination target locations). The area of the peeled area 60 created by one of the separation area creating step is in the range of 0.25~1m ^2.

  After the peeling area 60 having a predetermined area is formed on the floor surface 11 and the wall surface 12, the through-hole 40 is drilled in the coating film 13 adjacent to the peeling area 60 by the through-hole drilling process, and the through-hole is formed by the compressed air injection process. Compressed air is sprayed onto 40 to create a new peeling area 60 on the coating film 13. In this way, the through-hole drilling step and the compressed air injection step are repeated to create a plurality of peeling regions 60 in other portions of the floor surface 11 and the wall surface 12, and the coating film 13 is applied from substantially the entire area of the floor surface 11 and the wall surface 12. Peel off. Alternatively, after a plurality of through holes 40 are previously drilled in the coating film 13 by the through hole drilling process, a plurality of peeling regions 60 may be formed by sequentially injecting compressed air into the through holes 40 by the compressed air spraying process.

  After peeling the coating film 13 from substantially the entire area of the floor surface 11 and the wall surface 12, in the coating film collecting step, the operator lifts the coating film 13 from the floor surface 11 and the wall surface 12, for example, as shown in FIG. The coating film 13 is rolled on the surface 11 and the wall surface 12 to collect the coating film from the entire floor surface 11 and the entire wall surface 12. The collected coating film 13 is stored in a lead shielding container.

  In the decontamination method, the thickness dimension of the coating film 13 made by the coating film first creating step is in the range of 0.3 to 1.5 mm. When the thickness dimension of the coating film 13 is less than 0.3 mm, the coating film 13 is easily damaged by the air pressure of the compressed air injected from the decontamination system 41 to the through-hole 40 of the coating film 13, and the compressed air is The coating film 13 cannot be bulged from the floor surface 11 or the wall surface 12 and the peeling area 60 having a predetermined area cannot be formed on the floor surface 11 or the wall surface 12.

  When the thickness dimension of the coating film 13 exceeds 1.5 mm, the hardness of the coating film 13 increases more than necessary, and even if the air pressure of the compressed air injected from the decontamination system 41 acts, the floor surface 11 and the wall surface 12. Thus, the coating film 13 cannot be raised, and the peeling area 60 having a predetermined area cannot be formed on the floor surface 11 or the wall surface 12. In this decontamination method, since the thickness dimension of the coating film 13 is in the above range, the coating film 13 can be bulged from the floor surface 11 and the wall surface 12 by the air pressure of the compressed air, and the floor surface 11 and the wall surface 12 have a predetermined area. The peeling region 60 can be surely made.

  In the decontamination method (decontamination system 41), the discharge gauge pressure in the air compressor 42 is in the range of 0.4 to 0.8 MPa. When the discharge gauge pressure of the air compressor 42 is less than 0.4 MPa, even if compressed air is injected from the decontamination system 41 to the through hole 40 of the coating film 13, it acts between the floor surface 11 or the wall surface 12 and the coating film 13. The air pressure to be applied is small, the compressed air hardly enters between the floor surface 11 or the wall surface 12 and the coating film 13, and the coating film 13 cannot be bulged from the floor surface 11 or the wall surface 12. In other words, it is not possible to make the peeling area 60 having a predetermined area.

  When the discharge gauge pressure of the air compressor 42 exceeds 0.8 MPa, the air pressure acting between the floor surface 11 and the wall surface 12 and the coating film 13 becomes larger than necessary, and the through hole of the coating film 13 from the decontamination system 41. The coating film 13 is easily damaged by the air pressure of the compressed air jetted onto 40, and the compressed air is not released to the outside air from the tears of the coating film 13, and the coating film 13 is bulged from the floor surface 11 or the wall surface 12. The separation area 36 having a predetermined area cannot be formed on the floor surface 11 or the wall surface 12. In this decontamination method (decontamination system 41), since the discharge gauge pressure in the air compressor 42 is in the above range, the compressed air surely enters between the floor surface 11 or the wall surface 12 and the coating film 13 and is compressed. The coating film 13 is not damaged by the air, and the peeling area 60 having a predetermined area can be reliably formed on the floor surface 11 and the wall surface 12.

  After the coating film collection step is completed (after decontamination is completed), a decontamination paint second application step and a coating film second preparation step are performed. In the second decontamination paint application process, the peelable decontamination paint 10 is applied to the floor surface 11 and the wall surface 12 of the facility by any of brushes, rollers, and spray methods, as in the first decontamination paint application process. In the coating film second creating step, after the decontamination paint 10 is applied to the floor surface 11 and the wall surface 12, the paint 10 is cured for a predetermined time, the paint 10 is naturally dried, and the floor surface 11 and the wall surface 12 are coated with a predetermined thickness. A membrane 13 is made.

  In addition, in the decontamination method shown in FIGS. 19-28, after collect | recovering the peeled coating films 13, it apply | coats predetermined thickness to the floor surface 11 and the wall surface 12 by a decontamination paint 2nd coating process and a coating film 2 creation process. Although the film 13 is made again, the decontamination work can be completed by completing the coating film collection process by omitting the second decontamination paint application step and the second coating film preparation step.

  In the decontamination method, a peeling-type decontamination paint 10 that adsorbs and holds a radioactive substance 14 is applied to a floor surface 11 and a wall surface 12 (a decontamination target area in a predetermined range) of a facility, and a predetermined thickness is applied to the floor surface 11 and the wall surface 12. After forming the coating film 13, compressed air is sprayed from the spraying / suction means (the spray nozzle 47 of the air compressor 42) to the through-hole 40 of the coating film 13 to bulge the coating film 13 on the floor surface 11 and the wall surface 12, Since the coating film 13 is peeled off from the surface of the floor surface 11 and the wall surface 12, the radioactive substance 14 adsorbed and held on the coating film 13 (peelable decontamination paint 10) is scattered when jetting compressed air in the decontamination system 41. Rather, most of the radioactive substance 14 existing on the floor 11 and the wall 12 of the facility within a predetermined range together with the coating film 13 can be reliably removed from the floor 11 and the wall 12.

In the decontamination method, a peeling area 60 having a predetermined area (0.25 to ¹ m ² ) obtained by peeling the coating film 13 from the floor surface 11 and the wall surface 12 is formed. Since the coating film 13 of the area can be peeled at once, the peeling operation of the coating film 13 is easy, and the radioactive substance 14 adsorbed and held on the coating film 13 (peelable decontamination paint 10) is removed from the floor surface 11 or the wall surface. 12 can be removed at a large area at a time, and decontamination of the floor surface 11 and the wall surface 12 in a predetermined range can be efficiently performed in a short time, and the decontamination does not take time and labor, and is low Decontamination can be performed at a cost.

  The decontamination method removes the coating film 13 produced by the coating film first creation process from the floor surface 11 and the wall surface 12 of the facility, and then reapplys the peelable decontamination paint 10 to the floor surface 11 and the wall surface 12. Since the decontamination paint 10 is dried and a coating film 13 having a predetermined thickness is newly formed on the floor surface 11 and the wall surface 12, the coating film 13 is removed from the floor surface 11 and the wall surface 12 to remove the floor surface 11 and the wall surface 12. After the dyeing, the decontamination paint 10 is applied again to the floor surface 11 and the wall surface 12 to form a coating film 13, so that the contamination of the decontaminated floor surface 11 and the wall surface 12 due to the radioactive substance 14 is applied again. It can be protected by the membrane 13.

  The decontamination method uses an air suction device 43 during the jetting of compressed air to suck the air on the floor surface 11 and the wall surface 12 of the facility while filtering dust contained in the sucked air (the cyclone separator 49 and the bag filter 50). Since the dust is collected using the HEPA filter), the dust on the floor surface 11 and the wall surface 12 is collected and collected by the filters 49 and 50, and the scattering of the dust on the floor surface 11 and the wall surface 12 can be prevented. Even if the radioactive material 14 is contained in the dust, secondary contamination of the radioactive material 14 by the dust can be prevented.

  The decontamination system 41 used in the decontamination method uses an air compressor 42 (air injection device) and sucks air while injecting compressed air onto the floor surface 11 and the wall surface 12 (decontamination target portion of a predetermined range) of the facility. Since the air of the floor surface 11 and the wall surface 12 is sucked using the apparatus 43 and the coating film 13 is expanded by the air pressure of the compressed air to peel the coating film 13 from the floor surface 11 and the wall surface 12, the floor surface 11 and the wall surface 12 and reliably remove most of the radioactive material 14 present on the floor surface 11 and the wall surface 12 in a predetermined range together with the coating film 13 (peelable decontamination paint 10) from the floor surface 11 and the wall surface 12 while preventing dust scattering. can do.

  Since the decontamination system 41 can peel the coating film 13 of a predetermined area from the floor surface 11 and the wall surface 12 at the same time when the coating film 13 is peeled off, the peeling operation of the coating film 13 is easy and is adsorbed by the coating film 13. The retained radioactive substance 14 can be removed from the floor surface 11 and the wall surface 12 in a wide area at a time, and the decontamination of the floor surface 11 and the wall surface 12 in a predetermined range can be efficiently performed in a short time. Dyeing does not take time and effort and can be decontaminated at a low cost.

  The decontamination system 41 collects dust contained in the sucked air using a filter (a cyclone separator 49, a bag filter 50, and a HEPA filter) while sucking air on the floor surface 11 and the wall surface 12 when compressed air is injected. Since dust is collected, dust on the floor surface 11 and the wall surface 12 is collected and collected by the filters 49 and 50, and scattering of dust on the floor surface 11 and the wall surface 12 can be prevented, and the radioactive material 14 is included in the dust. Even if it is, secondary contamination of the radioactive substance 14 by dust can be prevented.

  FIG. 29 is a process schematic diagram illustrating another example of the first decontamination paint application process, and FIG. 30 is a process schematic diagram illustrating another example of the first coating film forming process. FIG. 31 is a process schematic diagram illustrating another example of the through-hole drilling process, and FIG. 32 is a process schematic diagram illustrating another example of the compressed air injection process. FIG. 33 is a process schematic diagram illustrating another example of the separation region creation process continued from FIG. 32, and FIG. 34 is a process schematic diagram illustrating an example of the separation region creation process continued from FIG. 33. FIG. 35 is a process schematic diagram illustrating an example of a coating film collecting process. 29 to 35, a part of the road surface 61 is omitted. 33 and 34, the hood 57 and the suction hose 53 are not shown, and only the injection nozzle 47 is shown.

  The decontamination method shown in FIGS. 29 to 35 includes a decontamination paint first application process, a coating film first creation process, a through-hole drilling process, a compressed air injection process, an air cleaning process, a peeling area creation process, and a coating film collection process. Each of the steps are performed. In the first decontamination paint application step, the stripping-type decontamination paint 10 that adsorbs and holds the radioactive substance 14 on the road surface 61 that is an uneven surface or the road surface 61 that is a surface having complicated undulations (a decontamination target area within a predetermined range) is provided. Apply. The decontamination paint 10 is applied by any one of a brush, a roller, and a spray method.

  In the first paint film creation step, the separation-type decontamination paint 10 is applied to the entire area of the road surface 61 or a predetermined section, then the paint 10 is cured for a predetermined time, and the paint 10 is naturally dried. Make 13 When the coating film 13 is formed on the road surface 61 by the first coating film creation step, the radioactive substance 14 present on the road surface 61 is adsorbed and held on the coating film 13 (peelable decontamination paint 10). The road surface 61 is either a smooth surface or a porous surface. The thickness dimension of the coating film 13 made by the coating film first creating step is in the range of 0.3 to 1.5 mm.

  After forming the coating film 13 by the decontamination paint 10 on the road surface 61, a through-hole drilling process is implemented. In the through-hole drilling step, cylindrical or pointed drilling tools 39A and 39B (see FIG. 19) are used to drill the through-hole 40 that reaches the road surface 61 through the coating film 13 at a predetermined position of the coating film 13. To do. Note that the injection nozzle 47 of the air compressor 42 of the decontamination system 41 may be used as a drilling tool. Moreover, in the through-hole drilling step, a plurality of through-holes 40 may be drilled in advance at positions of the coating film 13 that are spaced apart from each other by a predetermined interval (separation interval of each through-hole 40: 50 to 100 cm).

After the through-hole 40 is drilled in the coating film 13, a compressed air injection process is performed. In the compressed air injection process, a decontamination system 41 shown in FIGS. 20 and 21 is used. In the compressed air injection step, compressed air is injected from the injection / suction means (the injection nozzle 47 of the air compressor 42) toward the through hole 40 formed in the coating film 13. It should be noted that the discharge gauge pressure of the air compressor 42 can be adjusted in the range of 0.4 to 0.8 MPa according to the conditions such as the unevenness and the undulations of the road surface 61, and the amount of air discharged from the air compressor 42 Can be adjusted within a range of ³ to 6 m ³ / min.

  At the time of jetting compressed air, an air cleaning process is performed simultaneously with the compressed air jetting process. In the air cleaning process, the air suction device 43 is operated, and compressed air is jetted from above the coating film 13 toward the through hole 40, and at the same time, air around the through hole 40 (decontamination target location) is jetted. Suction is performed by suction means (suction port 58 of suction hose 53). The air sucked from the suction port 58 of the suction hose 53 during the injection of the compressed air flows into the cyclone separator 49 through the suction hose 53. The dust contained in the air is collected by the cyclone separator 49 and accommodated in the lead shielding container 55.

  The air flowing out from the cyclone separator 49 flows into the bag filter 50 through the connection hose 54. Dust that reaches the bag filter 50 without being collected by the cyclone separator 49 is collected by the bag filter 50 and accommodated in the lead shielding container 56. The air flowing out from the bag filter 50 enters the blower 51 through the connection hose 54, passes through the blower 51, and flows into the filter case 52. When air flows into the filter case 52, the air flows through the HEPA filter housed in the case 52, particulates contained in the air are collected by the HEPA filter, and clean air from which dust and particulates have been removed is an air suction device. 43 is exhausted to the outside.

  When compressed air is injected into the through-hole 40 drilled in the coating film 13 while sucking air using the decontamination system 41, the compressed air passes through the through-hole 40 between the road surface 61 and the coating film 13 ( It enters between the surface of the road surface 61 and the back surface of the coating film 13. In the separation region creation step, the air pressure of the compressed air acts between the road surface 61 and the coating film 13, and the coating film 13 bulges from the road surface 61 by the air pressure of the compressed air that has entered between the road surface 61 and the coating film 13 ( The coating film 13 swells like a balloon and gradually peels off from the road surface 61.

After the coating film 13 bulges due to the air pressure of the compressed air, the injection of the compressed air is interrupted, and when a predetermined time elapses, the air is discharged from the through holes 40 of the coating film 13 to the outside air, and the bulging coating film 13 is deflated. As shown in FIG. 34, a peeling area 60 having a predetermined area is formed on the road surface 61 (decontamination target portion within a predetermined range). The area of the peeled area 60 created by one of the separation area creating step is in the range of 0.25~1m ^2.

  After the peeling area 60 having a predetermined area is formed on the road surface 61, the through-hole 40 is drilled in the coating film 13 adjacent to the peeling area 60 by the through-hole drilling process, and the compressed air is injected into the through-hole 40 by the compressed air injection process. It sprays and the new peeling area | region 60 is made in the coating film 13. FIG. In this way, the through-hole drilling step, the compressed air injection step, and the separation region creation step are repeated to create a plurality of separation regions 60 in other parts of the road surface 61, and the coating film 13 is applied from substantially the entire area of the road surface 61 or from a predetermined section. Peel off. After peeling the coating film 13 from substantially the entire area of the road surface 61 or from a predetermined section, in the coating film collecting step, the operator lifts the coating film 13 from the road surface 61, and the coating film 13 is applied to the road surface 61 as shown in FIG. It rolls and collects a coating film from the whole road surface 61 or predetermined section. The collected coating film 13 is stored in a lead shielding container. The decontamination work is completed upon completion of the coating film collection process.

  In addition, after the coating-film collection | recovery process is completed (after decontamination is completed) similarly to the decontamination method shown in FIGS. 19-28, a decontamination coating material 2nd application process and a coating-film 2nd creation process are implemented. You can also. In the second decontamination paint application step, the peelable decontamination paint 10 is applied to the road surface 61 of the facility by any one of a brush, a roller, and a spray method, as in the first decontamination paint application step. In the coating film second creation step, after applying the decontamination paint 10 to the road surface 61, the paint 10 is cured for a predetermined time, the paint 10 is naturally dried, and the coating film 13 having a predetermined thickness is formed on the road surface 61.

  29 to 35, the decontamination paint 10 that adsorbs and holds the radioactive substance 14 is applied to the road surface 61 that is an uneven surface or the road surface 61 that is a surface having complicated undulations (a decontamination target within a predetermined range). The coating film 13 having a predetermined thickness is formed on the road surface 61, and then compressed air is sprayed from the spraying / suction means (the spray nozzle 47 of the air compressor 42) into the through hole 40 of the coating film 13. Since the coating film 13 is bulged and the coating film 13 is peeled off from the surface of the road surface 61, the radioactive substance 14 adsorbed and held on the coating film 13 (peelable decontamination paint 10) when compressed air is jetted in the decontamination system 41. Is not scattered, and most of the radioactive substance 14 existing on the road surface 61 within a predetermined range together with the coating film 13 can be reliably removed from the road surface 61.

In the decontamination method, a peeling area 60 having a predetermined area (0.25 to ¹ m ² ) is formed by peeling the coating film 13 from the road surface 61, and the coating film 13 having a predetermined area is removed from the road surface 61 at a time when the coating film 13 is peeled off. Since the coating film 13 can be easily peeled off, the radioactive material 14 adsorbed and held on the coating film 13 (peelable decontamination paint 10) can be removed from the road surface 61 in a wide area at a time. In addition, it is possible to efficiently decontaminate a predetermined range of road surface 61 having irregularities and complex undulations in a short time, and decontamination can be performed at low cost without taking time and effort for decontamination. .

  The decontamination method uses a filter (a cyclone separator 49, a bag filter 50, a HEPA filter) for dust contained in the sucked air while sucking the air on the road surface 61 using the air suction device 43 when jetting compressed air. Therefore, the dust on the road surface 61 is collected and collected by the filters 49 and 50, and the dust on the road surface 61 can be prevented from being scattered. Even if the dust contains the radioactive substance 14 Secondary contamination of the radioactive substance 14 by dust can be prevented.

  The decontamination system 41 used in the decontamination method shown in FIGS. 29 to 35 injects compressed air onto a predetermined range of road surface 61 (decontamination target location) using an air compressor 42 (air injection device). However, the air suction device 43 is used to suck the air on the road surface 61, and the coating film 13 is exfoliated by the air pressure of the compressed air to peel the coating film 13 from the road surface 61 having irregularities and complex undulations. It is possible to reliably remove most of the radioactive substance 14 present on the road surface 61 within a predetermined range together with the coating film 13 (peelable decontamination paint 10) from the road surface 61 while preventing dust from being scattered.

  Since the decontamination system 41 can peel off the coating film 13 having a predetermined area from the road surface 61 having unevenness and complex undulations when the coating film 13 is peeled off, the peeling operation of the coating film 13 is easy. The radioactive material 14 adsorbed and held on the surface 13 can be removed from the road surface 61 at a large area at a time, and the road surface 61 in a predetermined range can be efficiently decontaminated in a short time, and the decontamination takes time and effort. Decontamination can be performed at a low cost.

  The decontamination system 41 collects dust contained in the sucked air using a filter (a cyclone separator 49, a bag filter 50, a HEPA filter) while sucking the air on the road surface 61 when jetting compressed air. Dust on the road surface 61 is collected and collected by the filters 49 and 50, so that dust can be prevented from scattering on the road surface 61. Even if the radioactive material 14 is included in the dust, the radioactive material 14 caused by the dust Secondary contamination can be prevented.

10 Peeling type decontamination paint 11 Floor surface (predetermined area for decontamination)
12 Wall surface (decontamination target area within the specified range)
13 Coating 14 Radioactive Material 15 Dry Ice Placing System 16 Dry Ice Blasting Device 17 Air Suction Device 18 Spraying / Drinking Means 19 Dry Ice Blasting Device Main Body 20 Blast Hose 21 Nozzle 21A Round Nozzle 21B Flat Nozzle 22 Cart 23 Cyclone Separator (Filter )
24 Bag Filter 25 Blower 26 Filter Case 27 Suction Hose 29 Lead Shielding Container 30 Lead Shielding Container 31 Hood 32 Suction Port 33 Injection Port 34 Hole 35 Peeling Area 36 Cutting Site 37 Peeling Target Section 38 Peripheral 39A Drilling Tool 39B Drilling Tool 40 Through Hole 41 Decontamination system 42 Air compressor (air injection device)
43 Air suction device 44 Injection / drinking means 45 Air compressor body 46 Air hose 47 Injection nozzle 48 Carriage 49 Cyclone separator (filter)
50 Bag Filter 51 Blower 52 Filter Case 53 Suction Hose 55 Lead Shielding Container 56 Lead Shielding Container 57 Hood 58 Suction Port 59 Injection Port 60 Peeling Area 61 Road Surface

Claims (14)

In the decontamination method for decontaminating a predetermined area of decontamination target,
The decontamination method includes a decontamination paint first application step in which a release-type decontamination paint that adsorbs and holds a radioactive substance is applied to the decontamination target location, and the decontamination paint is dried to be predetermined in the decontamination target location. After creating the coating film by the coating film first creating process for creating a coating film having a thickness and the coating film first creating process , the dry ice blasting apparatus is used to move the nozzle of the dry ice blasting apparatus in an arbitrary direction. A dry ice second driving step for driving dry ice pellets into the coating film by compressed air from the nozzle of the dry ice blasting device while moving, and a dry ice pellet driven into the coating film by the second driving step for dry ice The coating film 1st cutting process which cuts the coating film made in the said decontamination object location, and the separation object area surrounded by the cutting site | part of the said coating film are said decontamination object A release target segments created making process at the steps dry ice first implantation of implanting dry ice pellets at a predetermined portion of the coating film of the release target segments by the compressed air from the nozzles of the dry ice blasting apparatus, the dry ice first the sublimation of the dry ice pellets implanted in the coating film by implantation step, the by bulging the coating film from the surface of the release subject section, peeled the paint film from the release target segments of the decontamination object point, the decontamination A decontamination method comprising: a delamination region creating step of creating a delamination region having a predetermined area by peeling off the coating film at a target location. In the decontamination method, after the delamination area is created in the delamination area creation step, the dry ice blasting device is moved in the delamination area, and the dry ice pellets are moved to the delamination area. The decontamination according to claim 1 , comprising a third dry ice driving step for driving and a second coating cutting step for cutting a coating film in the vicinity including the peeling region by the dry ice pellet driven into the peeling region. Method. In the decontamination method, the nozzle of the dry ice blasting device used in the first dry ice blasting step is a round nozzle having a circular injection port, and the second dry ice blasting step and the third dry ice blasting step are performed. The decontamination method according to claim 2, wherein the nozzle of the dry ice blasting device used in the process is a flat nozzle having a jet port that is long in one direction .   The decontamination method creates a plurality of peeling regions at the decontamination target location by driving the dry ice pellets, and after removing the coating film from the decontamination target location, collects the coating film in these separation regions. The decontamination method according to any one of claims 1 to 3, further comprising a coating film collecting step.   The decontamination method peels the coating film from the decontamination target location by driving the dry ice pellets, collects the coating film from the decontamination target location by the coating film recovery step, and then into the decontamination target location. A decontamination paint second application step for reapplying the decontamination paint, and a coating for drying the decontamination paint applied in the second decontamination paint application step to form a coating film having a predetermined thickness at the decontamination target location. The decontamination method of Claim 4 including a film | membrane 2nd preparation process.   An air cleaning step in which the decontamination method uses a filter to remove dust contained in the sucked air while sucking air in the decontamination target portion using an air suction device when the dry ice pellets are driven. The decontamination method according to any one of claims 1 to 4, comprising: The coating thickness is in the range of 0.3 to 1.5 mm, the diameter of the dry ice pellets, decontamination method according to any one of claims 1 to 6 in the range of 2~5mm . The decontamination method according to any one of claims 1 to 7, wherein an application surface of the decontamination target portion to which the release-type decontamination paint is applied is a flat surface, an uneven surface, or a surface having complicated undulations . The decontamination method according to any one of claims 1 to 7, wherein an application surface of the decontamination target portion to which the release-type decontamination paint is applied is a smooth surface or a porous surface in which a large number of fine holes are formed. . And in the decontamination process, the decontamination method according to any one of claims 1 to claim 9 area of the release region is in the range of 0.25～1M ² made by one of the release area creation process. The decontamination method according to any one of claims 1 to 10, wherein the decontamination target site is a facility where radioactive material may be generated or a site contaminated by the radioactive material . In a dry ice driving system used for a decontamination method for decontaminating a predetermined range of decontamination targets,
The dry ice driving system is connected to the dry ice blasting device and the air suction device, and connected to the dry ice blasting device and the air suction device, while spraying dry ice pellets on the decontamination target location, from the decontamination target location It consists of jetting / suctioning means that sucks air,
The air suction device is formed of a movable carriage having casters, a filter installed on the carriage, and a blower installed on the carriage and allowing air to flow through the filter, and the jetting / suctioning means is A hood having a predetermined volume, a suction port of a suction hose that extends from the air suction device and is fixed to the hood, and a circular spray port, and is connected to a spray port of the spray gun of the dry ice blasting device A round nozzle fixed to the hood so as to be replaceable, and a flat nozzle connected to the spray gun firing port of the dry ice blasting device and exchangeably fixed to the hood. And formed from
In the dry ice driving system, after forming a coating film on the decontamination target site by a peeling type decontamination paint that adsorbs and holds radioactive substances, the flat nozzle is used to move the flat nozzle in an arbitrary direction, While blowing the dry ice pellets toward the coating film by the jetting / suction means and sucking air in the decontamination target location, the coating film is cut to create a separation target section in the decontamination target location, Using the round nozzle, the spray / suction means drives the dry ice pellets into a predetermined portion of the coating film of the separation target section and sucks the air in the separation target section, and the separation by sublimation of the dry ice pellet. A dry ice placing system characterized by bulging the coating film from the surface of the target section and peeling the coating film from the separation target section. Temu. A filter of the air suction device is installed in the cart to collect dust, a bag filter installed in the cart to collect dust flowing out of the cyclone separator, and installed in the cart The dry ice driving system according to claim 12, wherein the dry ice driving system is formed of a HEPA filter that collects particulates contained in the air flowing out of the bag filter . The air suction device is connected to the lower opening of the cyclone separator and accommodates the dust collected by the cyclone separator, and is connected to the lower opening of the bag filter and collected by the bag filter. The dry ice placing system according to claim 13, further comprising a lead shielding container for containing dust .

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