JP6079984B2 - Protective and disposable interstitial covered tent - Google Patents

Description

The present invention relates to a protective and disposable intervention envelope shaped tent, particularly for the intervention against contaminated objects, wherein the tent is leak-proof and comprises at least a first soft flat sheet and It relates to a protective and disposable interstitial covering tent having a second soft flat sheet. In particular, the present invention relates to a protective tent suitable for intervening with contaminated objects, such as those subjected to nuclear radiation or contaminated with bacteria or viruses. The invention also relates to a method for testing the leakproofness of a nuclear enclosure and a method for storing a protective tent after its life cycle.

  When disassembling nuclear facilities, such as mixed oxide (“MOX”) and other plutonium-containing fuel rod production lines, one of the major issues is the enclosure that is contaminated with radioactive materials inside. The problem is that this radioactive pollutant is decomposed without being released. Several methods for disassembling radioactively contaminated enclosures have been proposed. In this case, for example, a glove box is used. This is because, although this type of enclosure is the most popular, other types of nuclear enclosures can of course be used for this purpose.

  First of all, it must be considered whether the glove box should be disassembled in a building in which it is in operation or whether the glove box is moved somewhere else. In the latter case, the glove box is packaged and transported. This transport has the risk of releasing pollutants during glove box packing, loading, transportation and unloading. Furthermore, transporting glove boxes with very large dimensions can be difficult and even impossible.

  Due to these transport disadvantages, disassembling the glove box outside its working building is usually considered only if an existing hot cell suitable for processing the glove box is already available.

  However, if the nuclear enclosure or glove box is to be disassembled in the facility in which it is operating, whether it is located in the same room or in another room in the same building Three different methods have been proposed, i.e. disassemble the glove box in an alpha stop cell, a cutting box or a protective tent.

  In the first method, the glove box is transported to a disassembly alpha-stopping cell installed in the operating facility. The alpha stop cell contains all the cutting equipment necessary to carry out the necessary disassembly work to the outside environment under leakage. The operation of the disassembly tool is performed by an operator standing in the alpha stop cell. Such operators are equipped with dedicated leak-proof clothing and breathing apparatus that allow them to work within the internal environment of the leak-proof room. Operator entry and exit is expected to take place via a suitable airlock. Removal of waste pieces resulting from the cutting operation is achieved by using a waste drum connected to the alpha stop cell.

  If the glove box is to be disassembled in a cutting box located in the operating facility, the glove box is first transported to the cutting box. The cutting box is a dedicated glove box that contains cutting equipment that realizes disassembly work while being isolated from the external environment. Similar to the glove box, the cutting box comprises a glove port and a window, and the cutting box is maintained under reduced pressure by its own ventilation system. The operation of the cutting tool is performed by an operator standing outside the cutting box. Such an operator is equipped with equipment and a monitoring device similar to the equipment and the monitoring device that are equipped when working on the glove box. Entering the cutting box containing the glove box to be disassembled is performed using conventional bag-in techniques, but very large bags are used. This bag-in technique allows the introduction of equipment or other objects while maintaining enclosure containment. For this purpose, the device or object is placed in a bag, and an O-ring is provided on the open side of the bag. The O-ring is then secured in a groove provided around the access port of the enclosure, thereby overlapping with another bag already present at the access port and closing this other bag. To introduce the device or object, the device or object is pulled with the bag positioned within the enclosure. Once the device or object is located inside, the access port is closed by the bag containing the device or object.

  The removal of the waste pieces resulting from the cutting operation is ensured by a waste drum coupled to the cutting box. Optionally, lightweight master-slave arms and tongs can be used in the cutting box to extend the working range and reduce operator exposure to radiation. Similar safety and containment issues are encountered when performing extensive maintenance on contaminated process enclosures.

  In order to address the shortcomings of hot cells, alpha-stopped cells and cutting boxes, the technology of protective tents is described in DE 40 30 186 or R. BAUMANN, P. FABER, “ Dismantling Techniques for Plutonium-Contaminated Glove-boxes: Experience from First Year of Decommissioning, No. 6th International Symposium of Radioactive & Decommissioning Wastes, Kontec 2003, Berlin, Germany, March 2003, A Wanderghey A. VANDERGHEYNST, JM. CUCHET, “Strategy for Decommissioning of the Globeboxes in the Bergo Nuclear Dessel Mox Fuel Fabrication Plant ( Strategy for Decommissioning of Glove-Boxes in the Belgonucleaire Dessel Mox Fuel Fabrication Plant ”, 11th International Conference on Environmental Remediation and Radioactive Waste Management ICEM'07 (11th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM'07) Bruges, Belgium, September 2-6, 2007, and A. VANDERGHEYNST, JM. CUCHET, Sufen (SFEN) , “Anne Evo An evolutionary approach for the decommissioning of the Glove Boxes in the Belgonucleaire Dessel Plant, International The conference “Decommissioning Challenges: An Industrial Reality”, Avignon, France, proposed September 28-October 2, 2008.

According to this technique, the glove box is transported to a protective tent installed in the glove box operating facility, or the protective tent is erected around the glove box on the site. The protective tent is disposable and is manufactured to the size and shape of the glove box to be disassembled and attached to an outer metal support to prevent collapse when under pressure. Has a flexible envelope . Similar to the glove box, the protective tent assembly may include a glove and window and may be maintained in a vacuum by its own ventilation system. In the context of the present invention, what is understood by the term “reduced pressure” is a pressure that is significantly lower than the pressure of the ambient atmosphere. The tent can accommodate a cutting device (saw, punching cutting tool,...) For performing the disassembling work in a state isolated from the external environment. The operation of the disassembly tool is performed by an operator standing outside the disassembly tent. These operators may be equipped with tools and monitoring devices similar to those used while operating the process glove box. Waste resulting from the cutting operation is discharged by a conventional bag-out technique via a proximity port or in a leak-proof manner to a waste drum coupled to a protective tent. However, the bag-out technique is similar to the bag-in technique, but the difference is that in this case the object is not taken into the glove box but out of the glove box.

After disassembly, the protective tent is disposed of as secondary waste. In order to limit the amount of secondary waste, the covering is made of thin-walled flat sheets that are welded together to provide structural resistance and leak tightness. After use, discard this cover, therefore, it is good packed into the drum for conditioning a well or a later stage to the small pieces which were further cut by winding the cover. A glove or glove port, window and other mechanical and electrical tools are attached to the cover in a leaktight manner. In order to prevent accidental release of contaminants in the case of mechanical damage to the cover by the disassembled parts or the disassembling tool, the cover is maintained at a normal substantial reduced pressure (100-200 Pa). Cover resistance is tested (eg, up to twice the operating pressure) and ventilation is performed at an appropriate flow rate (eg, 60 m ³ / h) to maintain a reduced pressure even in the case of substantial mechanical damage.

When implementing this scheme, it is most important for safety purposes to avoid creating fragile or defective welds between adjacent sheets of covering . In order to achieve the realization of good quality welds, tents are pre-manufactured according to a quality control program and large welding machines with process control devices are used in a dedicated manufacturing facility. The overall air density and resistance to accidental decompression conditions are tested on the final product before delivery to the cracking plant.

  In the context of a cracking glove box, what is understood as “leak protection” is not absolute air density, but achievable dust and aerosol containment. However, it is a condition that the enclosure is maintained at a reduced pressure of 100 to 200 Pa with respect to the ambient pressure, and the air density is on the order of 0.1% by volume per hour.

However, in order to be able to introduce the glove box into the wrap during the disassembly operation, the wrap must first be opened and then closed, again in this case once a contaminated glove box Measure the leak-proof property when is located inside.

German Patent Application Publication No. 4030186

R. BAUMANN, P. FABER, "Dismantling Technics for Protonium-Contaminated Glovebox: Experience from First Year of Decoration (Dismantling) Techniques for Plutonium-Contaminated Glove-boxes: Experience from First Year of Decommissioning ”, 6th International Symposium of Radioactive & Decommissioning Wastes, Kontec 2003, Berlin, Germany, March 2003 A. VANDERGHEYNST, JM. CUCHET, “Strategy for Decommissioning of the Globeboxes in the Bergo Nuclear Dessert Mox Fuel Strategy for Decommissioning of Glove-Boxes in the Belgonucleaire Dessel Mox Fuel Fabrication Plant ”, The 11th International Conference on Environmental Remediation and Radioactive Waste Management ICEM'07 (11th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM'07) Bruges, Belgium, September 2-6, 2007 A. VANDERGHEYNST, JM CUCHET, Sufen (SFEN), “An Evolutionary Approach for the Decommissioning of the Globe Boxes・ An evolutionary Approach for the Decommissioning of the Glove Boxes in the Belgonucleaire Dessel Plant, International Conference “Decommissioning Challenges: An International Conference“ Decommissioning Challenges: an Industrial Reality ”), Avignon, France, September 28-October 2, 2008

If the glove box is of complex shape, it is also necessary to give the complex shape also to the leak-proof cover and thus to ensure these leak-proof properties while joining adjacent soft sheets at crossing angles . Furthermore, if the glove box has large dimensions, the leak-proof cover is intended for non-contaminated manufacturing and transportation purposes and once the interior of the cover is irreversibly contaminated, the final disposal purpose For this reason, it is necessary to make special parts in various parts.

It is an object of the present invention to provide a protective and disposable interstitial covered tent that is reusable as long as it is not contaminated and is easy to install and remove.

To this end, the protective and disposable interstitial tent of the present invention further comprises at least one first mechanically resistant and reusable closure member, the tent having first and second portions. The first part is attached to the first sheet, the second part is attached to the second sheet, and the first closure member attaches or detaches the first soft sheet and the second soft sheet to each other. A first tent, the tent further comprising at least one second leak-proof and reusable closure member, the second closure member being connected to the first seat in a leak-proof manner. And a second flap connected in a leak-tight manner to the second seat, the first flap and the second flap being secured together by a seal seal. The first closure member and the second closure member extend substantially parallel to each other, and the first flap and the second flap and the first sheet and the second sheet are attached to each other. , Configured to overlap the first mechanical closure member. When this tent is formed of a soft flat sheet, the attachment is realized by assembling different soft flat sheets. For this purpose, a first mechanical closure member is used, the first and second parts being attached to each other, for example to attach the sheets together. Since the flap attached to the seat in a leak-proof state is provided, the seats can be attached in a leak-proof state. This is because the flaps are attached to each other in a leak-proof manner. In addition, because the flap overlaps the first mechanical closure member, leaks past the first closure member are retained by the flap, thereby providing a secure leakproof tent.

A first preferred embodiment of the protective and disposable interstitial covering tent is characterized in that the first closure member and the second closure member extend in a substantially parallel direction when the tent is in the installed state. This is the case, for example, when the tent is formed by a base structure and a hood structure that are connected to each other by first and second closure members that extend horizontally.

A second preferred embodiment of the protective and disposable interstitial tent is that the first and second portions of the first closure member are at the lateral boundaries of the first and second sheets, respectively. Attached, the tent further comprising at least a third soft flat sheet, and a first closure member attached to the lateral edge of the first or second sheet and the lateral edge of the third sheet, respectively. And further comprising a third part and a fourth part, wherein the third part and the fourth part are either the first flexible sheet or the second flexible sheet depending on the third part and the fourth part. A third flap provided for attachment to and removal from the third seat, the second closure member being connected to the lateral edge of the third seat and the first or second seat in a leak-tight manner, and 4th flat A first seal, a second flap, a third flap and a fourth flap attached to the first flap, the second flap, the third flap and the fourth flap At least one substantially horizontally extending first closure when the tent is in the attached state at any time when the tent is in the attached state. Characterized in that they are positioned adjacent to each other to have a combination of a member and at least one second vertically extending closure member. Thereby, a tent having a more complicated geometric shape can be constructed. This is because it is possible to use a plurality of sheets provided in juxtaposition vertically and horizontally assembled with each other by using the first and second closure members.

A third preferred embodiment of the protective and disposable interstitial covering tent is characterized in that the flap extends beyond the surface located under the spread of the respective sheet to which the flap is attached. In this manner, the first closure member T, or other shaped juxtaposed first, second, third and fourth portions can be used. Certainly, since the flaps extend beyond the surface of each of these sheets, it is also possible to create an overlap condition across the surfaces of adjacent sheets, thereby preventing the tent from leaking. improves.

In a fourth preferred embodiment of the protective and disposable interstitial tent, the tent further comprises a plurality of third mechanically resistant and reusable closure members, each third closure member being a first. A first closure element coupled to a first sheet and a second closure element coupled to a second sheet, wherein the first closure element and the second closure element are first when in the closed state. And forming an additional attachment for the second flexible sheet and complementing each other to bridge the at least one first mechanical closure member when the at least one first mechanical closure member is in the closed state. It is characterized by. By using the third closure member, it is possible to improve the mutual attachment of the sheets. Since the third closure member bridges the first closure member, the third closure member compensates for possible defects in the first closure member.

  The present invention will now be described in detail with reference to the accompanying drawings.

FIG. 2 shows a protective and disposable interstitial tent covering a glove box to be disassembled. FIG. 11 is a cross-sectional view taken along the line II-II ′ of the protective and disposable interstitial tent covering the glove box to be disassembled. It is a figure which shows the detail of the 1st, 2nd and 3rd closure member. FIG. 4 shows a detail of a portion of a protective and disposable interstitial tent, showing first, second and third closure members mounted vertically and horizontally. FIG. 4 shows a detail of a portion of a protective and disposable interstitial tent, showing first, second and third closure members mounted vertically and horizontally. FIG. 4 is a cross-sectional view of details of first, second and third closure members. FIG. 4 is a cross-sectional view of details of first, second and third closure members. FIG. 4 is a cross-sectional view of details of first, second and third closure members. It is a figure which shows the protective tent of the geometric shape of a rectangular parallelepiped. It is a figure which shows the protection tent of the geometric shape which consists of many rectangular parallelepipeds. It is a figure which shows the method of testing the leakproof property of a protection tent. It is a figure which shows the method of decomposition | disassembly and storage of a tent. It is a figure which shows the method of decomposition | disassembly and storage of a tent. FIG. 3 shows a secondary tube for storing a tent to be shredded. It is a figure which shows how a tent is stored in a drum after decomposition | disassembly.

  The drawings are only schematic. In the drawings, the dimensions of some of the elements may be exaggerated and not drawn on scale for illustrative purposes only. Furthermore, identical reference signs indicate identical or similar elements.

FIG. 1 shows a protective and disposable interstitial tent 1 of the present invention covering a glove box 2 (shown in dotted lines) to be disassembled. For the sake of clarity, the invention will be described with respect to an embodiment as a protective tent for the disassembly of a glove box. However, it will be apparent that the invention is not limited to this embodiment and that the tent can be used for intervention on any type of contaminated object. The protective tent 1 has a leak-proof cover 3 for creating the required leak-proof environment since the risk of contamination is minimized during intervention inside the glove box. The leakproofness of the protective tent is ensured by the use of a leakproof closure member, which provides a leakproof seal between the different sheets 20, 21 forming the cover tent.

The cover is held by a strap 5 attached to a metal support 6 forming an outer metal frame. The support provides a structural multipurpose backbone to the tent. The support 6 can be reused after the contaminated cover is discarded.

Protection tent 1 has a leak tight port 7, for example, an air lock can carry away / or from the same time bring in into the shape tent covering an object without impairing the leak-tightness of the cover-shaped tent. During handling, equipment necessary for support (not shown), such as equipment, tools, power outlets, monitoring devices, emergency fire extinguishing equipment, such as robot arms for remote control operations, ventilation pipes, etc. Can be brought into the leakproof tent in a leakproof state. The operation of the disassembly tool is performed by an operator standing outside the protective tent. Such an operator may be equipped with tools and monitoring devices similar to those used while operating the process glove box. Further, the waste container 8 is connected to the leak-proof tent in a leak-proof state for discharging the waste generated as a result of the disassembling work.

The protective tent 1 preferably further comprises at least one leak-proof window 9 that allows light to enter the tent and to see the interior of the tent. The protective tent further comprises at least one glove port 11 provided in the tent construction material. For example, one or more gloves, for example one or more pairs of gloves, are attached to the glove port in a leak-tight manner to allow manual action within the wrap Yes.

Protection tent 1 preferably is illustrated in Figure 8 connected to the ventilation system to be able to or causing a vacuum therein or covering 3 ventilating the inside of the cover 3 (not shown) It further has at least one ventilation pipe 50. In the context of the present invention, “vacuum” is understood to be a pressure which is in particular 100 to 200 Pa lower than the pressure of the ambient atmosphere. Ventilation is generally performed at an appropriate flow rate, for example 60 m ³ / h, to minimize the release of nuclear contaminants even in the event of substantial mechanical damage. The tent is typically maintained under vacuum (100-200 Pa) to further prevent accidental release of contaminants in the case of mechanical damage to the tent 3, for example caused by disassembled parts or disassembly equipment Is done. Prior to disassembling the glove box, the resistance of the covering is preferably tested by applying a high vacuum, for example twice the working vacuum. The term “resistance” refers to the structural resistance of the tent and the welds or seams between the soft sheets as components, the technical effort due to the vacuum and the tent after the tent has been attached to the metal support 6 by the operator. It is to be understood that this is the structural tolerance of other technical work effort resulting from handling and operating tools.

The covering is typically made of a soft or flexible canvas material, such as a woven or non-woven polymer soft sheet, such as a woven polyethersulfone (PES) foil. The flexible sheet may be coated on one or both sides with, for example, polyvinyl chloride (PVC), which provides structural resistance and facilitates sheet welding and / or adhesion during manufacture of the covering. To do.

FIG. 2 is a cross-sectional view of the tent of FIG. The cover has a first soft flat sheet 20 and a second soft flat sheet 21 attached to each other. For clarity, although tents having only two sheets are shown, the present invention is not limited to the tent covering is made of only two sheets, in order to form a tent Obviously, multiple sheets can be used. In the illustrated embodiment, the first sheet forms the lower part of the tent and the second sheet forms the upper part of the tent.

At least one first mechanically resistant and reusable closure member 22 is provided to allow attachment of the different sheets forming the cover . As used herein, the expression mechanically resistant means a closure member that withstands a force of at least 50N. The expression reusable herein generally means that the closure member must allow multiple attachments and removals of the first and second seats.

  As shown in FIG. 3, the first closure member 22 has a first portion 23 and a second portion 24. The first portion 23 is attached to the first sheet 20, and the second portion is attached to the second sheet 21. In the embodiment shown in FIG. 3, the first closure member is preferably formed by a zipper sewn to the sheet. As a modified example, a hook-and-loop fastener attaching member such as Velcro (registered trademark) may be used. Instead of sewing the first closure member to the sheets, the first and second portions may be bonded to the respective sheets. The first portion and the second portion of the first closure member are complementary to each other to allow the first sheet 20 and the second sheet 21 to be attached together. Thus, when the first closure member is formed of a zipper, it may be sufficient to close the zipper to attach the first sheet and the second sheet to each other. The first closure member is preferably attached along the lateral and / or lateral boundaries of the seat.

However, the first closure member merely provides a mechanically resistant and reusable closure member that attaches the first and second sheets together. The first closure member is reusable. This is because, for example, the first closure member can be opened and closed several times by handling a zipper or hook-and-loop fastener attachment member.
At least one second leakproof and reusable closure member is provided to provide leakproofness for attachment between the sheets forming the cover . The closure member has a first flap 25 connected to the first sheet 20 in a leak-proof state and a second flap 26 connected to the second sheet 21 in a leak-proof state. Connecting the flaps to the sheets in a leak-proof manner is achieved, for example, by welding or bonding the flaps to their respective corresponding sheets. To attach the flap to the sheet, the flap edges 27, 28 are welded or glued offset from the portion of the sheet to which the first closure members 23, 24 are attached. Preferably, the flaps extend substantially parallel to the first closure member and to each other. The first flap 25 and the second flap 26 are further provided to be attached to each other in a leak-tight manner, preferably by a leak-proof seal attached along these other edges 29, 30.

  Thus, once the first portion and the second portion of the first closure member 22 are attached to each other, the first flap 25 and the second flap 26 are coupled together so as to overlap the first closure member. The Thereafter, the flaps are preferably welded or glued together along these edges 29,30. The flap is preferably made of polyvinyl chloride. In this way, a leakage closure between the first sheet and the second sheet is obtained.

As further shown in FIG. 3, the covering further comprises a plurality of third closure members 31 that are mechanically resistant and reusable. The third closure members 31 each have a first closure element 31-1 connected to the first sheet 20 and a second closure element 31-2 connected to the second sheet 21. The first closure element and the second closure element are complementary to each other to form an additional attachment of the first flexible sheet and the second flexible sheet when in the closed state. The third closure member bridges the first mechanical closure member 22 whenever both are in the closed state. The third closure member is formed, for example, by a buckle, and the elements of the buckle are clipped together. The third closure member is provided in a space covered by the second closure member so as not to adversely affect the leak-proof property. The first and second closure elements are preferably sewn to the seat to which they are attached. By providing the third closure member, the mechanical attachment between the first sheet and the second sheet is improved. Once the first portion and the second portion of the first closure member are attached to each other, the third closure member is in their closed state, and thus the second closure member is in their closed state. .

  Figures 4a and 4b show how three and four different sheets are attached to each other by means of a closure member. In the embodiment of FIG. 4 a, a third sheet 32 is attached to the first sheet 20 and the second sheet 21. For attachment of the first sheet 20 and the third sheet 32 and the second sheet 21, the first closure member 22, the first flap 25, the second flap 26 and the third closure member 31 are substantially In contrast, for the attachment of the first sheet 20 and the third sheet 32, the closure member extends in a substantially vertical direction.

  As can be seen in FIG. 4b, the first portion 23 and the second portion 24 of the first closure member 22 are attached to the lateral boundaries of all sheets and extend substantially horizontally. . In order to allow the first sheet 20 and third sheet 32 to be attached together and the fourth sheet 33 and fifth sheet 34 to be attached together, the first closure member comprises the first sheet 20 and the third sheet. And a third portion 35 and a fourth portion 36 respectively attached to the lateral boundary of the second sheet 32 and the lateral boundary of the fourth and fifth sheets 33 and 34. Similar to the first and second portions of the first closure member, the third portion 35 and the fourth portion 36 attach the first and third seats and the fourth and fifth seats laterally to each other. It is provided to be removed or removed. The third and fourth portions of the first closure member, like the first and second portions, are preferably either sewn or bonded to their respective corresponding sheets. The third and fourth portions are formed by a zipper or a hook-and-loop fastener mounting member.

  The second closure member is connected in a leak-proof manner to the third flap 37, the third sheet 32, and the fifth sheet 34 connected in a leak-proof manner to the first sheet 20 and the fourth sheet 33. And a fourth flap 38. The flaps extend along the lateral edges of the sheet to which they are attached. Preferably, the flaps extend beyond the surface located under the spread of the respective sheet to which these flaps are attached. As will be explained below, this allows a leakproof attachment on the corner pieces of different sheets attached to each other to form a tent.

  The third flap 37 and the fourth flap 38 are provided to be attached to each other in a leak-tight manner by a leak-proof seal, just like the first flap and the second flap. As further shown in FIGS. 3, 4 a and 4 b, the third sheet, the fourth sheet and the fifth sheet preferably further comprise a third closure member 31. The closure member extends substantially horizontally and vertically.

  To assemble the first sheet 20, the second sheet 21 and the third sheet 32 as shown in FIG. 4a, the first sheet and the second sheet can be attached to the first sheet, for example. The first part 23 of the first closure member and the second part 24 of the first closure member attached to the second seat 21 are attached to each other by pulling them together. Next, the first portion and the second portion of the first closure member are attached to each other, thereby attaching the first sheet and the second sheet to each other. Thereafter, the first portion 23 of the first closure member attached to the third sheet with the third sheet 32 disposed adjacent to the first and second sheets is attached to the second sheet 21. It extends next to the second portion 24 of the first closure member being mounted. Thereafter, the first part and the second part are attached to each other as shown in FIG. 5a using, for example, a zipper. By attaching the third sheet to the second sheet, the third part and the fourth part 36 of the first closure member extend adjacent to each other so that these parts can be attached to each other, thereby The third sheet 32 and the first sheet 20 are now attached to each other. Thereafter, the third closure member 31 (if provided) is closed to improve the attachment between the first sheet, the second sheet and the third sheet as shown in FIG. 5b.

  Once the sheets are mechanically attached to each other, the flaps of the second closure member are attached to each other as shown in FIGS. 5a-5c. This is initiated, for example, by pulling the third flap 37 and the fourth flap 38 together so that their respective edges 40, 41 are in contact with each other. Next, for example, welding is performed along the edges 40 and 41. If the third and fourth flaps extend beyond the lateral edges of the first and third sheets, the applied weld also extends beyond these edges, so that the flaps have their length. It will be welded throughout. In sections extending beyond the lateral edges of the first and third seats, both lateral edges of the flap are welded to these lateral edges so that a closed seal is obtained over the entire circumference of the flap. .

Thereafter, the first flap 25 of the third sheet 32 and the second flap of the second sheet 21 are joined together so that their edges are in contact with each other. The weld is then applied along the edge 29 of the first flap 25 of the third sheet and the section of the second flap 26 of the second sheet 21 extending parallel to the first flap. Again, the resulting weld extends for the entire length of the associated flap section. Thereafter, the first flap 25 of the first sheet 20 and the second flap 26 of the second sheet are welded together in the same manner as one of the third and second sheets. Next, the sections of the third flap 37 and the fourth flap 38 extending on the first flap 25 and the second flap 26 of the first, third and second sheets, for example, the third sheet is welded. The first and second flaps 25 and 4 are welded together by being applied between the upper edge of the fourth flap and the lower edge section of the first and fourth flaps of the third sheet. Another weld is then applied between this lower edge section and the first and second flap edge sections of the first and second sheets. Finally, the lateral edges of the first and second flaps are welded together. In this way, a leak-proof closure is obtained. Leakage that may occur through the first closure member remains trapped in the volume defined by the flap. These flaps are welded across the side and lateral edges, resulting in a leak-proof enclosure, thereby avoiding leakage from the shroud reaching the outside world.

  The connection between the four sheets shown in FIG. 4b is realized in a manner similar to the connection described with reference to FIG. 4a and is therefore not described in detail. The leakproof closure member of the protective tent of the present invention may further include other closure members. For example, other types of first mechanical closure members, such as pressure buttons, may be used. As a modification, these buttons may be attached by stapling or riveting.

FIGS. 6a and 6b show a large protective tent provided to disassemble a large or complex glove box that cannot be transported. The tent 3 is composed of a plurality of soft sheets attached side by side. Depending on whether it is possible to cover some of the constituent parts of the cover, one or two or more of the soft sheet 21 is provided at the bottom of the tent. As an example, by dividing a very long covering into two normal covering parts, the final result by continuous production and transportation, standing around a glove box that is long but not transportable, and packaging and shredding Disposal becomes easy.

FIG. 6a shows a protective tent 1 in the shape of a cuboid. Therefore, the protective tent 1 of the present invention can be used in a wide variety of sizes and shapes, and can be manufactured in a complicated shape so as to cover a glove box having a large shape or a complicated shape. The reason why this is possible is that the soft sheets constituting the cover 3 can be attached to each other in a leak-proof state by the above-mentioned leak-proof closure member.

FIG. 6b shows a protective tent 1 having a geometric shape made up of a number of rectangular parallelepipeds, ie obtained by arranging two or more rectangular parallelepipeds. Again, the leaktightness of this complex shaped tent is achieved because the soft sheets of the cover 3 can be attached to one another in a leaktight manner by means of a leakproof closure member.

  To deal with complex dimensional shapes, the closure member may have an array of straight or curved segments. One straight or curved segment is positioned next to another straight or curved segment so that the last segment abuts the first segment, thereby providing a continuous leakage closure.

FIG. 7 shows a method for testing the leakproofness of a cover once assembled. Since it is very important to maintain the leakproofness of the protective tent, leakproofness is typically further measured in some cases, preferably after installation and during its lifetime. For example, the leak tightness is measured after the glove box is introduced into the tent. In order to be able to introduce the glove box into the tent 1 for disassembly purposes, the covering must first be opened and then closed, once the contaminated glove box is located inside, it will leak. Stopping properties are measured again. Prior to undertaking disassembly of the glove box within the cover , air and other gases are pumped out of the cover and then allowed to reach a predetermined vacuum. The cover is then hermetically sealed by sealing all the entrances to the cover . However, this method may not be accurate enough to assess the leakproofness of such a nuclear enclosure. In particular, the allowable leakage rate of such an enclosure for disassembling the glove box is typically on the order of several tens of ⁻³ Pa. Such leak tightness tests have several sources of error, such as the relationship between temperature and pressure, the ultimate flexibility of the enclosure wall, and so on.

Further, the leak-proof property is evaluated after the production of the covered tent. To achieve a high quality seam between adjacent sheets of tents (either between different edges of a folded sheet or between edges of different sheets), the tent is pre-made—preferably a parallelepiped As such-the quality assurance program is adapted. Large welding machines (eg, high frequency or resistance welders) equipped with a process control device are used in specialized manufacturing facilities to perform welding on flaps attached to a sheet. Overall leakage resistance under normal conditions and overall resistance to accidental conditions are tested on the final product before being sent to a disassembly operation to demonstrate the reliability of the weld. These tests are performed by placing an empty and non-contaminated wrap under normal and accidental vacuum (eg, twice the normal vacuum). Leakage resistance is measured using a pressure increase method.

The method for testing the leakproofness of the intervening tent of the present invention is as follows:
a) The step of closing the approach gate of the tent and erecting the covering 3 around the glove box 2.
b) providing an outer disposable enclosure 45 around the tent 1; Preferably, some distance is left between the cover 3 and the outer disposable enclosure.
c) having the tracer gas at a predetermined concentration in the covering 3 via the inlet 46;
d) measuring the amount of tracer gas leaked into the space between the cover 3 and the enclosure 45;

Cover 3 leakage can be determined by measuring either the flow rate of air exiting the cover or the concentration of tracer gas in the outer disposable enclosure 45. The tracer gas is selected from, for example, CO ₂ , SF ₆ or refrigerant gas.

As with the prior art nuclear enclosure, this detection and / or measurement may be performed using a tracer gas sensor coupled to the tent ventilation system. Advantageously, the interior of the enclosure is also in a vacuum with respect to the outer world to increase tracer gas detection accuracy and prevent radioactive blowout from the enclosure. Enclosure leakage is measured by the concentration of gas in the nuclear enclosure, which is a direct measurement obtained using a conventional tracer gas sensor in the enclosure. By applying a vacuum, leakage of radioactive material from the cover is prevented. In addition, this contributes to the accuracy of this method. This is because the tracer gas that leaks into the cover is prevented from exiting again, thus reducing the measurement error. Advantageously, the total gas pressure in the outer enclosure 45 may be lower than the total gas pressure outside the outer enclosure. This reduces the risk of test gas escaping from the outer enclosure, which is particularly beneficial when the tracer gas cannot be said to be totally harmful. Thus, it is a safe and accurate means to test for leakproofness while the outer enclosure is evacuated. Indeed, gases and substances carried by the gas, such as harmful substances, are prevented from exiting the enclosure by evacuating the leak-tight covering , which contributes to more accurate gas measurements.

It is necessary to check the leakproofness again for safety purposes after introducing a contaminated glove box into the tent and re-tightening the tent cover by welding or gluing the flaps attached to adjacent seats There is. In order to avoid the possibility of irreversibly contaminating the cover at this stage, if a pressure increase method is used for the cover , the leakproof check is preferably carried out with a one-tracer gas method according to ISO 10648-2 method. Is done. Since helium is an expensive fluid for checking this leakage level, other tracer gases such as CO ₂ , SF ₆ and refrigerant gases (such as freon gases) are considered. The use of these gases is limited by international regulations because they are toxic to the human body and impact the environment. Preferably, a temporary covering is constructed around the protective tent covering , in particular around a reusable joint to limit the quality of use of the tracer gas. Vacuum cascade _{(P glove box <P tent envelope} <P temporary envelope <P workshop) is temporarily organized by each environment and filtration systems, thereby covering the operator while avoiding premature contamination of the covering Protect against premature accidental contamination and inhalation of toxic tracer gas. Leakage rate tent covering is evaluated by testing enclosure according the manner determined given to standards ISO10648-2, the air flow rate and the tracer gas concentration of the tent covering and glove box measurement.

Provided that this temporary covering is large enough to accept the operator and that proper ventilation and filtration is anticipated, this temporary covering may be subject to accidental contamination (e.g., a pin on the glove during disassembly or maintenance operations). It can also be used as an additional nuclear containment system ("third barrier") that limits the spread of contamination in the workplace (through a hall).

Once testing leak tightness with once to build tent of the present invention by attaching the different sheets together using closure member, the tent can be used for intervening in pairs on the object of contaminated. Since the closure members are all reusable, the tent can be removed as long as the tent is not contaminated during the intervention , which is done inside the tent. For this purpose, the flap is opened, for example by cutting off the applied weld or applied glue stripe. In this way, the first closure member and, if provided, the third closure member are again accessed and can be opened. The flap initially has a sufficient width, for example 50 cm, to allow several uses, including tent attachment and removal.

Can be used several times to intervening against the tent objects contaminated, tent, at one time during its lifetime, tent contamination of the reasons or tents that damaged or broken too The end of its life cycle is reached for one of the following reasons. When the tent reaches the end of its life, it must be destroyed and stored in a safe manner. Preferably, the inner wall of the covering is covered with a spray before the tent is discarded. The purpose is to attach as much contaminant particles as possible to the inner wall of the cover . This produces secondary nuclear waste or other contaminated waste. In view of the fact that the covering material is flammable and may contain halogen, such materials may be stored in the drum. For this purpose, it is necessary to fold the cover to allow storage in the drum. Depending on the size of the cover, covering the better to be stored after being cut into pieces or is stored directly into the drum.

FIG. 8 shows the various steps of the method for storing the protective and disposable intervening covering 3 according to the invention. To avoid contaminated air or gas reaching the outside atmosphere, the cover 3 is connected via its outlet 50 to an air pumping device (not shown). The covering is removed from its support structure and falls onto the ground by gravity. The air pumping device remains attached to the outlet 50 during removal of the shroud and even when the shroud falls on the ground.

The cover is literally crushed by falling on the ground, so the cover is folded and bundled, thereby obtaining a bundle-like structure. Also, during this folding, the pumping device remains in operation. Thereafter, the folded cover is wrapped to form a wrapped cover , while air and gas continue to be pumped from the inner body of the cover . Once the cover is packaged, the pumping device is disconnected from the cover and then the cover is transferred into the primary tube 53. Once the cover is placed in the primary tube, it is sealed by applying seals 51, 52 to both ends of the primary tube. The primary tube is preferably made of polyvinyl chloride (PVC).

If the covering consists of a large structure as shown in FIG. 9 (in this figure a covering made of three sections is shown), each section is connected to a pumping device. These sections are separated from each other by folding the flap and opening the first closure member and, if necessary, the third closure member before folding. In this way, these sections can be handled separately as if they were individual covers .

Once each cover is housed in the primary tube 53, the cover and its sealed primary tube 53 are transferred into the secondary tube 56. The secondary tube 56 is preferably made of polyurethane and has an O-ring 54 at its inlet opening, as shown in FIG. This allows the secondary tube and its contents to be attached to the glove box inlet, where the covering and the primary and secondary tubes can be discarded. The use of an O-ring allows a substantially leak-free connection of the secondary tube to the glove box. Destroying once covered in the glove box, it is possible to store the discarded cover into the drum in other similar manner as used in object contaminated.

FIG. 11 shows a method similar to that described with reference to FIG. The method of FIG. 11 differs from the method of FIG. 10 in that no secondary tube is used. The wrap is stored directly in the drum 57, wrapped in the primary tube.

DESCRIPTION OF SYMBOLS 1 Cover- shaped tent 2 Glove box 3 Cover 5 Strap 6 Support body 7 Air lock 9 Window 11 Glove port 20 1st sheet | seat 22 2nd sheet | seat 22 1st closure member 23 1st part 24 2nd part 25, 26 Second closure member (first flap and second flap)
27, 28, 29, 30 Edge 31 Third closure member 31-1 First closure element 31-2 Second closure element

Claims (16)

A protective and disposable interstitial tent (3) for intervening in particular against contaminated objects, said tent being leak-proof,
At least a first soft flat sheet (20) ;
At least a second soft flat sheet (21) ;
At least one first portion comprising a first portion (23) attached to the first flexible sheet (20) and a second portion (24) attached to the second flexible sheet (21) . 1 of mechanically resistant click closures member (22), was closed,
Before SL least one first closure member (22) is composed of the first soft sheet (20) and said second soft sheet (21) to install or remove from each other,
The tent, have at least one second leakproof click closures member (25, 26), said second closure member,
A first flap (25) connected in a leak- proof manner to the first soft flat sheet (20) ;
Comprises a second flap coupled (26) in a state leakproof in a flat sheet (21) of said second soft,
The first flap (25) and the second flap (26) are configured to be leak-tightly attached to each other by a leak-proof seal ;
The first and second flaps (25, 26) have the at least one first mechanical closure member (22) and the at least one second leakage closure member (25) substantially parallel to each other. to extend the Rukoto, when the first and second flaps (25, 26) and the first and second soft flat sheet (21, 22) are attached to each other, said at least one second Closure members (25, 26) overlap the at least one first mechanical closure member (22) ;
The first mechanical closure member (22) and the second leak-proof closure member (25, 26) are reusable;
The first and second flaps (25, 26) extend beyond the surface of a soft flat sheet (20, 21) to which the first and second flaps (25, 26) are respectively attached. and that the protection and disposable intervening cover shaped tent. The protective and disposable intervening covering according to claim 1, wherein the at least one first and second closure members (22, 25, 26) extend in a substantially horizontal direction when the tent is in an installed state. tent. The protective and disposable intervening covering according to claim 1, wherein the at least one first and second closure members (22, 25, 26) extend in a substantially vertical direction when the tent is in an installed state. tent. The first mechanically said first and second portions of the resistant closure member (22) (23, 24) is pre-Symbol first and second soft flat sheet (20, 21), respectively The protective and disposable interstitial covered tent according to claim 1, which is attached at the side boundary of the. Further comprising at least a third soft flat sheet;
At least one other first closure member comprises:
A third portion attached to one lateral edge of said first and flat sheets of the second, soft,
A fourth portion attached to a lateral edge of the third soft flat sheet,
Said third and fourth portions is configured with one of the flat sheet before Symbol first and second soft to remove or install a flat sheet of the third soft,
At least one other second closure member comprises:
A third flap connected in a leak-proof state to the third soft flat sheet ;
A fourth flap connected in a leak-tight state to one of the first and second soft flat sheets ,
Before Symbol third flap and the fourth flap is adapted to be mounted in a leaktight together by leakage tight seal,
When the first , second and third soft flat sheets are positioned adjacent to each other , at least one substantially horizontally extending first and second closure when the tent is in an installed state member and, that having a combination of at least one substantially vertically extending first and second closure members, the protective and disposable intervening cover shaped tent according to any one of claims 1-4. The protective and disposable intervening covered tent according to any one of claims 1 to 5, wherein the leak-proof seal is formed by a weld applied to the flap. Each soft flat sheet has at least first and second sheet edges located on opposite sides of the sheet, and the first portion of the first mechanical closure member includes the first Attached along the first sheet edge of the sheet, the second part of the first mechanical closure member is attached along the second sheet edge, the first part and the first 2 part is the first mechanical closure of the sheet in which the first part of the first mechanical closure member of one of the sheets is located adjacent to the one soft flat sheet It said second portion and mounting detachable connecting portion is complementary to each other to form a protective and disposable intervening cover shaped tent according to any one of claims 1 to 5 members. The protective and disposable intervening covering tent according to any one of claims 1 to 7, wherein the first closure member is formed by one of a zipper and a hook- and -loop fastener mounting member. The tent further includes a plurality of third mechanically resistant and reusable closure members, each third closure member being connected to the first soft flat sheet. A first closure element and a second closure element coupled to the second soft flat sheet, wherein the first closure element and the second closure element are in the closed state when the first closure element is in the closed state. And forming an additional attachment for the second soft flat sheet and bridging the at least one first mechanical closure member when the at least one first mechanical closure member is in a closed state 9. A protective and disposable interstitial covered tent according to any one of the preceding claims, which are complementary to each other. 10. The protective and disposable intervening covering tent according to claim 9, wherein the third closure member is formed by a buckle provided at a distance from each other along an edge of the soft flat sheet. Further comprising a metal support for the hold, protect and disposable intervening cover shaped tent according to any one of claims 1 to 10. A method for testing the protection and leak-proof properties of a disposable interstitial covered tent according to any one of claims 1-11,
a) closing the interstitial covering tent by using the closure member;
b) providing an outer disposable enclosure around the covering ;
c) providing a predetermined concentration of tracer gas between the outer disposable enclosure and the covering tent;
d) measuring leakage of the tracer gas into the covered tent. Leakage of said cover, said outer disposable enclosure and one of the covering, is assessed by measuring at least one of the concentration in the air flow and the tracer gas method of claim 12 Symbol mounting . The tracer gas is selected from CO _2, SF ₆ or a refrigerant gas, according to claim 12 or 13 A method according. A method of storing the protection and disposable intervening cover shaped tent according to any one of claims 1 to 11, connected to the cover pneumatic feeding device, the cover is air in the cover are the pumping folded while being sent out by the device, then to form a covering of the winding state by winding a covering of the folded state, thereafter, disconnecting the cover from the pumping device, and thereafter, shifts within the primary tube Sealing the primary tube and then storing it in one of the secondary tube and drum. The method of claim 15 , wherein the tent is divided into tent segments by separating the sheet by cutting away a portion of the flap before being rolled.