JP3125853B2 - Radiation protection mat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a radiation protection mat.
More particularly , the present invention relates to a radiation protection mat suitable for use in medical, general industry, and nuclear power plants (during periodic inspection work, etc.) to protect workers from radiation exposure.

[0002]

2. Description of the Related Art In recent years, work under radiation has been generalized in medical and general industries and nuclear power plants based on laws and regulations including safety, and sufficient maintenance and inspection has been performed in each industry. . However, work under radiation is indispensable as a technology of all industries, and in such a site, necessary measures are taken to reduce radiation exposure of workers engaged in the work. One of them is, for example,
There is a method using a radiation shield as proposed in JP-A-61-147998. This uses the property that radiation is attenuated by water and covers facilities and equipment that may emit radiation by injecting water into a bag made of synthetic resin cloth.

[0003]

However, the radiation shield proposed in the above-mentioned utility model has practical drawbacks in the following points, and it is necessary to improve the function and practicality in actual use. there were.

[0004] Specifically, simply by pouring water into the bag,
It is clear that air accumulation occurs inside the bag body due to water injection, and the water shielding effect cannot be sufficiently maintained for the purpose of radiation protection. Because the internal volume of the bag is determined, the required amount of air cannot be injected unless air is properly degassed or discarded at the time of water injection (air in the bag is stagnated due to water injection pressure). It is a target. Therefore, if the air is not sufficiently vented by exhausting or the like, the amount of dispensed water is reduced, and the shielding effect by the predetermined water cannot be obtained. There is only one port for injecting water into the bag body, and it is necessary to run a hose for water injection each time for injecting water. This is actually very inconvenient at a regular inspection site of a nuclear power plant. This is because a worker whose working time is short in order to minimize the exposure is running a hose for injecting water into the radiation shield, wasting too much time. In addition, running long hoses is an unsafe operation. The proposed conventional radiation shield is designed to be connected with a zipper, but considering the thickness of the bag that can have the effect of shielding radiation, its weight is considerable, and the fastening with the fastener However, there is a limit to a bag having a sufficient size and thickness. That is, in practice, it was found that a bag having a thickness sufficient to block the radiation could not be fixed with a fastener, and it was found that there was a problem in actual use. An object of the present invention is to sufficiently examine the previously proposed radiation shields as described above in terms of ease of use and to maintain the shielding effect in accordance with the actual work environment, and to study based on the experience of actual work experience. Another object of the present invention is to provide an easy-to-use radiation protection mat and a method of using the same.

[0005]

In order to achieve the above object, the present invention provides a radiation protection mat bag which is formed into a rectangular parallelepiped by injection of water and at least two corners of the bag. Provide a water outlet , at least one side of the bag, the other side
Formed and reinforced with a synthetic resin cloth thicker than the side
That radiation protection mat intended to provide a, a place to issue the radiation covered in the bag, without the water inlet of next to a bag body comrade to be connected to the water-tight with a simple hose through which the water, bag in after scold Water is injected into the body and used as a bag with the initial thickness and strength, allowing workers to walk and carry equipment.
The strength was retained.

[0006]

[0007]

[0008]

[0009]

[0010]

[0011]

This kind of radiation protection mat according to the present invention is effective for protecting workers from exposure to periodic inspections of nuclear power plants and the like.

[0013] Above all, its ease of use is a major advantage. That is, it is possible to take a mat configuration of a necessary size according to the working environment. That is, the worker brings the lightweight mat before water injection to the site, connects it to the already laid radiation protection mat that has already been spread, and fixes it. Connect the water inlet to the nearest water inlet of the radiation protection mat laid this time, open the valve and inject water.

[0014] The radiation protection mat before water injection, which was brought in and spread this time, is filled with a radiation shielding mat having a required thickness and strength by flowing from the spread radiation protection mat already sufficiently filled with water. The function will be retained.

[0015] In the case where the radiation protection mat which has been added is filled with water and the strength of the radiation protection mat which has already been spread becomes insufficient, etc., water from the outside which is attached to the water inlet of the mat which was first spread. I will refill the water from the water inlet.

In order to shield radiation, it is necessary to maintain a certain thickness. For this purpose, the water supply port of the mat is constantly monitored with pressure, and a function of supplementing water while watching the pressure drop is provided. Perfect.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

The radiation protection mat 1 of this embodiment will be described with reference to FIGS. 1, 2, 3, 4, 5 and 6.

The radiation protection mat 1 has a tread surface 2, a side wall portion 3 supporting the tread surface 2, and a reinforcing wall 4 formed inside. The tread surface 2 is made of a synthetic resin processed cloth having a strength enough to withstand the weight of the tread surface 2 because a worker walks or crosses using a bogie when carrying equipment. The radiation protection mat 1 is formed in a bag body by the tread surface 2 and the side wall 3 and is manufactured in a watertight manner. The water inlets 5 are provided at two corners on the front surface of the tread surface 2. Water inlets 5 ′ are also provided at two corners on the back of the tread surface 2. The water inlets 5 may be provided at three or four corners of the surface of the tread surface 2.
The water inlet 5 ′ is also provided at three places or 4 on the back of the tread surface 2.
It may be provided at two corners. Reference numeral 6 denotes a connector. The details of the connecting tool 6 will be described later.

The size of the radiation protection mat 1 is determined to some extent from the consideration of the radiation shielding ability and the simplicity of handling. Specifically, the length of one side of the tread surface 2 is 1.5 m to 3.0 m, and the height of the side wall portion 3 is 0.1 m.
m to 0.2 m. Of course, the length of one side of the tread surface 2 does not need to be equal, and may be rectangular.
However, if the size is increased unnecessarily, radiation protection mat 1
The usability of handling is worsened, and the stability as a scaffold for those who work is impaired.

The dimensions of the side wall 3 are important. This size is determined in consideration of the radiation shielding ability by water and further considering the environment in which the worker walks.

When the radiation protection mat 1 is not used, the water inside is drained out as shown in FIG. 5 and stored in a flat state or rolled up as shown in FIG. 6, and stored.
The radiation protection mat 1 from which water has been drained has a small weight, and can be easily transported and spread by an operator.

FIG. 7 shows a state in which a plurality of radiation protection mats 1 are spread in use. Tread 2
Are arranged side by side, and the water inlets 5 formed on the tread surface 2 are connected by a simple hose 7 for each adjacent bag. The simple hose 7 has a structure that can be attached to and detached from the water inlet 5 in a watertight manner, and forms a valve 8 at an intermediate portion as necessary. The connecting member 6 is a belt 6a as described in detail in the embodiment.
And the metal fitting 6b. The connecting tool 6 having this configuration has both a function as a handle and a function to connect adjacent bags.

The radiation protection mat 1 is constructed as described above, so that the bags laid down first are filled with water by pouring water from the water inlet 5 into the bags laid down one after another. It becomes a plane that maintains thickness and strength. When the bag covers the radiation-emitting device or piping system and is filled with water in an expanded state to a desired thickness, radiation from the device or piping system is shielded by the radiation protection mat 1. In this state, the worker can engage in maintenance and inspection work with a sense of security.
The injection of water into the radiation protection mat 1 will be described in detail with reference to FIG. Water is injected into the first radiation protection mat from the simple hose 7 (first simple hose) connected to the water inlet 5 of the radiation protection mat 1 (first radiation protection mat) located on the right side in FIG. A first simple hose, a first radiation protection mat, and a simple hose 7 (second simple hose) connecting the first radiation protection mat and a radiation protection mat 1 (second radiation protection mat) adjacent to the first radiation protection mat located on the left side in FIG. 7; The valve 8 provided on the simple hose 7 (third simple hose) connected to the other water inlet of the radiation protection mat is open. As the water is injected into the first radiation protection mat, the gas in the first radiation protection mat reaches the second radiation protection mat through the second simple hose. After the inside of the first radiation protection mat is full, water reaches the second radiation protection mat through the second simple hose. The gas in the second radiation protection mat is discharged outside through the third simple hose. As described above, since the gas in the radiation protection mat is easily released at the time of water injection, water injection into each radiation protection mat can be performed in a short time. After the water injection is completed, the valves 8 provided on the first simple hose, the second simple hose, and the third simple hose are closed.

In this embodiment, the water inlet 5 provided at the corner of the adjacent radiation protection mat is connected to a simple hose 7 as shown in FIG.
Therefore, the simple hose 7 is located at the periphery of the radiation protection mat, and the simple hose 7 does not hinder the worker from walking on the tread surface 2.

FIG. 8 shows an example in which the radiation protection mat 1 is applied to a site. Specifically, a required number of radiation protection mats 1 are placed on the water tank 9 that emits radiation.
Represents a state in which they are spread. This state is effective, for example, when a work is performed to close the upper part of the reactor pool and to inspect and maintain the surrounding auxiliary equipment.

FIG. 9 shows how the radiation protection mat 1 is used in an environment where radiation is shielded along the wall surface. Specifically, this is effective when an operation such as carrying a device while temporarily securing a work passage occurs. Reference numeral 10 represents a state where the radiation protection mat 1 is fixed to the wall surface by using the connecting tool 6 when the radiation protection mat 1 is erected.

FIG. 10 shows an embodiment in which the radiation protection mat 1 is used in a cylindrical shape. Specifically, this is a usage example in which the radiation protection mat 1 is wound around a pipe or the like from which radiation may be emitted.

FIG. 11 shows another embodiment of FIG. 10, which shows a state in which the radiation protection mat 1 covers an object without making the radiation protection mat 1 cylindrical.

A radiation protection mat 1A according to another embodiment of the present invention will be described with reference to FIGS. The radiation protection mat 1 </ b> A has a side wall 3 </ b> A made bellows, and other configurations are the same as the radiation protection mat 1. The water inlets 5 are provided at four corners of the tread surface 2. When the radiation protection mat 1A is used by changing the amount of water injected into the inside according to the size of the radiation source and the size of the radiation source in time, the side wall 3A is bellows, so that the mat 1A By changing the volume, an appropriate shielding effect can be obtained.

FIG. 14 shows a radiation protection mat 1B according to another embodiment of the present invention which can be applied to radiation shielding of a nozzle portion of a nuclear pressure vessel of a nuclear power plant. The radiation protection mat 1B has a configuration in which a part is cut so as to straddle the nozzle part 10 (or the pipe 11 connected to the nozzle part 10) of the reactor pressure vessel. Further, the radiation protection mat 1B has a band portion 14 for attaching the fishing tackle 13 in order to easily install the nuclear pressure vessel having a high radiation level on the nozzle portion. The fishing catch 13 is inserted between the band portion 14 and the side wall portion, and is provided with a hole that is engaged with the hook. Radiation protection mat 1B other than these
Is the same as that of the radiation protection mat 1.

FIG. 15 shows a detailed structure near the water inlet 5 of each radiation protection mat described above. A coupler 16 is attached to the tread 2 of the radiation protection mat 1 by screws. Gaskets (seal members) 18 and 19 are installed in contact with both surfaces of the tread surface 2 in order to ensure airtightness of the screw penetration portion. The gasket 19 is pressed against the tread surface 2 by a tubular holding plate 20. The coupler 16 is located inside the radiation protection mat 1. When the coupler 17 to which the simple hose is attached is engaged with the coupler 16, the simple hose is connected to the water inlet 5 of the radiation protection mat. The coupler 17 is detachably engaged with the coupler 16. This structure is a one-touch coupler.
Thus, the connection of the simple hose to the radiation protection mat is easy. Further, the pressure resistance and strength of the connected joint portion at the time of connection, water flow, and exhaustion can be guaranteed. FIG. 16 shows a radiation protection mat 1C that can be inserted into the pipe 15 according to another embodiment of the present invention. The radiation protection mat 1C has a columnar shape with water injected therein. Specifically, when the piping 15 or the like that may emit radiation is disassembled, it is inserted into the inside and used.

The radiation protection mat of the present invention has been described above. (1) A circle, a triangle, a polygon, a mat shape such as a vest for wearing the human body, and (2) a mat for reinforcing the mounting strength of the mat. (3) A resin material other than reinforced synthetic resin cloth and a mat material such as a substitute material such as a fiber or a vinyl product may be used.
Radiation protection mat of the present invention, from the viewpoint of actually working the conventional mat, devised usability and retention of shielding function, etc.,
This is a more practical radiation protection mat and can provide the following effects.

1. Enhancement of mounting and handling can be expected.

2. It is possible to sufficiently maintain the shielding function, and it is possible to sufficiently reduce the exposure when using the mat.

3. It can be used in a wide range of work fields such as medical care, general industry, and nuclear power plants.

[0037]

The radiation protection mat of the present invention has been completed as a more practical radiation protection mat of this kind, which has been conventionally proposed and has been devised from the viewpoint of using it at the actual work site. , Its practical effect is immense.

[Brief description of the drawings]

FIG. 1 is a plan view of a radiation protection mat according to an embodiment of the present invention.

FIG. 2 is a right side view of the radiation protection mat of FIG.

FIG. 3 is a bottom view of the radiation protection mat of FIG.

FIG. 4 is a perspective view of the radiation protection mat of FIG. 1;

FIG. 5 is a perspective view showing a state in which water has been drained from the radiation protection mat of FIG. 1;

FIG. 6 is a diagram illustrating a state of being wound up and stored in the state of FIG. 5;

FIG. 7 is a perspective view showing the radiation protection mat of FIG. 1 in a water injection use state.

FIG. 8 is an elevational view showing an articulated use state of the radiation protection mat of FIG. 1;

FIG. 9 is a perspective view showing another articulated use state of the radiation protection mat of FIG. 1;

FIG. 10 is a perspective view showing still another use state of the radiation protection mat of FIG. 1;

FIG. 11 is a perspective view showing still another use state of the radiation protection mat of FIG. 1;

FIG. 12 is a perspective view of a radiation protection mat according to another embodiment of the present invention.

13 is a sectional view taken along line AA of FIG.

FIG. 14 is a perspective view of a radiation protection mat according to another embodiment of the present invention in which a nozzle portion of a reactor pressure vessel can be shielded.

FIG. 15 is a detailed sectional structural view near a connection portion between a radiation protection mat and a simple hose.

FIG. 16 is a perspective view of a radiation protection mat according to another embodiment of the present invention.

[Explanation of symbols]

1 ... radiation protection mat, 2 ... tread surface, 3 ... side wall, 4 ...
Internal reinforcement wall, 5 ... water inlet, 6 ... connecting tool, 7 ... simple hose, 8 ... valve, 9 ... water tank.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinzo Kosaka 3-2-2 Saimachi, Hitachi City, Ibaraki Prefecture Within Hitachi Engineering Services Co., Ltd. (72) Inventor Isao Nemezawa 3-chome, Saimachi, Hitachi City, Ibaraki Prefecture No. 1-1 Inside Hitachi, Ltd. Hitachi Factory (72) Inventor Masahiro Kimura 3-1-1 Sakaimachi, Hitachi City, Ibaraki Prefecture Inside Hitachi, Ltd. Hitachi Factory (56) References JP-A-57-52898 (JP) JP-A-4-305198 (JP, A) JP-A-61-147998 (JP, U) JP-B-49-38800 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB Name) G21F 3/00

Claims (1)

(57) [Claims] 1. A bag of a radiation protection mat which is formed into a rectangular parallelepiped by injection of water, and a water inlet is provided at at least two diagonal corners of the bag , at least one side of the bag and the other side.
Radiation protection mat reinforced by forming with a thicker synthetic resin processed cloth .