JP5482509B2 - Method of dismantling equipment or equipment that is contaminated with radioactive materials inside - Google Patents

Description

  The present invention relates to a method for disassembling an apparatus or facility whose inside is contaminated with a radioactive substance.

  There is known a glove bag in which a harmful organic matter storage container can be wrapped and sealed, and a glove for manual work from the outside is provided (for example, see Patent Document 1). Since the glove bag is formed of a flexible sheet and deforms due to external pressing force, the glove bag can be used to manually process the harmful organic matter without exposing the harmful organic matter to the outside. can do.

JP 2003-200148 A

  By the way, the glove box used when processing a radioactive contaminant is known. Since the inside of such a glove box for treating radioactive contaminants is contaminated with a radioactive substance, it is necessary to disassemble the glove box in a sealed space in order to prevent leakage of the radioactive substance. Here, by storing the glove box to be dismantled in the sealed space in the glove bag as described in Patent Document 1, the operator can disassemble the glove box from the outside of the sealed space.

  Here, when the glove box to be disassembled has been manufactured for a considerable period of time, the sealing member such as a rubber gasket for maintaining the sealing performance inside the glove box has deteriorated. ing. In such a case, if a force to be deformed is applied to the aging seal member, it is difficult to lift and move the glove box because there is a possibility that the sealing performance inside the glove box cannot be maintained. Moreover, it is difficult to lift and move the glove box even when the glove box is excessively heavy or when the carrying-out path of the glove box cannot be secured.

  This invention is made | formed in view of such a situation, The subject is leaking a radioactive substance in the place where the said apparatus or installation was installed in the apparatus or installation in which the inside was contaminated with the radioactive substance. It is to dismantle without.

  In order to solve the above problems, a dismantling method according to the present invention is a dismantling method of a device or equipment whose inside is contaminated with a radioactive substance, and a dismantling tent provided with a glove for dismantling work and opened on the bottom side, Covering the device or equipment, forming a sealed space in the dismantling tent by joining the entire circumference of the opening edge of the dismantling tent to the device or equipment, and using the glove, Disassembling a portion of the device or facility stored in the sealed space, and storing the disassembled material in a radioactive waste storage container communicated with the sealed space.

  In the dismantling method, the part remaining in the apparatus or facility that has not been dismantled and the dismantling tent are stored in a sealed space in a second dismantling tent provided with a dismantling work glove and dismantled. You may provide the process and the process of removing the said 2nd demolition tent which accommodated the dismantled thing.

  The dismantling method lifts a portion of the device or equipment that has not been dismantled, and configures the bottom of the second dismantling tent between the portion and the surface on which the device or equipment is installed. A step of laying the bottom of the tent, and a step of covering an upper portion of the second dismantling tent and the upper portion of the tent that is open on the bottom side of the dismantling tent in the device or facility and remaining undisassembled And a step of forming a sealed space in the second dismantling tent by joining the entire circumference of the opening edge of the top of the tent to the peripheral edge of the bottom of the tent. Or you may accommodate the site | part which was not dismantled in the installation, and the said dismantling tent in the said sealed space in a said 2nd dismantling tent.

  In order to solve the above-mentioned problems, a dismantling method according to the present invention is a dismantling method of an apparatus or equipment that is contaminated with radioactive material and installed on a gantry, and a glove for dismantling work is provided and the bottom side is open. Forming a sealed space in the dismantling tent by covering the dismantling tent on the apparatus or equipment, and joining the entire periphery of the opening edge of the dismantling tent to the mount; And disassembling the device or equipment stored in the sealed space, and storing the disassembled material in a radioactive waste storage container communicated with the sealed space.

  The dismantling method includes a step of housing the dismantling and the dismantling tent in a sealed space in a second dismantling tent provided with a dismantling work glove, and dismantling the first dismantling object And removing the two dismantling tents.

  The dismantling method includes a step of lifting the gantry and laying a tent bottom portion that constitutes a bottom portion of the second demolition tent between the gantry and an installation surface thereof; and The upper portion of the tent that is open on the bottom side is covered with the gantry and the dismantling tent, and the entire circumference of the opening edge of the tent upper portion is joined to the peripheral portion of the tent bottom. Forming the sealed space in the second dismantling tent, so that the gantry and the dismantling tent may be housed in the sealed space in the second dismantling tent. .

  ADVANTAGE OF THE INVENTION According to this invention, the apparatus or installation in which the inside was contaminated with the radioactive substance can be disassembled without leaking a radioactive substance in the place in which the said apparatus or installation was installed.

It is front sectional drawing which shows the glove box disassembly apparatus which concerns on one Embodiment. It is side surface sectional drawing which shows the glove box disassembly apparatus which concerns on one Embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on one Embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on one Embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on one Embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on one Embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on one Embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on one Embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on one Embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on one Embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on one Embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on other embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on other embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on other embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on other embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on other embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on other embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on other embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on other embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on other embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on other embodiment. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on a 1st reference example. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on a 1st reference example. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on a 1st reference example. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on a 1st reference example. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on a 1st reference example. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on a 2nd reference example. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on a 2nd reference example. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on a 2nd reference example. It is a sectional side view for demonstrating the disassembly method of the glove box which concerns on a 2nd reference example.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front sectional view showing a glove box dismantling apparatus 10 according to an embodiment, and FIG. 2 is a side sectional view showing the glove box disassembling apparatus 10. As shown in this figure, the glove box dismantling apparatus 10 includes a support frame 30, a tent 40 supported by the support frame 30 and accommodating the glove box 20 to be disassembled, and the glove box 20 accommodated in the tent 40. And a dismantling tool 50 such as a nibler or saw used for dismantling.

  The glove box 20 includes a bottom portion 22 made of metal such as stainless steel, and a transparent upper portion 24 made of resin having a lower end joined to the bottom portion 22, and is installed on the floor surface 12. The bottom 22 is a rectangular plate, and its peripheral edge 22A is curved upward. The upper part 24 is a rectangular parallelepiped housing whose lower end is opened, and the entire circumference of the opening edge part of the lower end is joined to the peripheral edge 22A of the bottom part 22 in a sealed state via a sealing member such as a rubber gasket. Yes. The inside of the glove box 20 is a sealed space in which the device 11 contaminated with radioactive material is accommodated.

  A plurality of gloves 26 are arranged on the side surface of the upper part 24 of the glove box 20 at predetermined intervals in the vertical direction and the horizontal direction. Each glove 26 is a cylindrical member that is formed integrally with the side surface of the upper portion 24 and extends into the glove box 20, and the tip of the cylindrical member has a shape resembling a hand. The operator can work in the glove box 20 by inserting his arm into the glove 26.

  The support frame 30 is a rectangular parallelepiped frame that is installed on the floor surface 12 on which the glove box 20 is installed. The support frame 30 is provided above the glove box 20 and the vertical frame 32 that is erected from the vicinity of the four corners of the bottom 22. A horizontal frame 34 is provided along each side of the upper surface of the upper portion 24 and connects the upper ends of adjacent vertical frames 32. Note that a total of four horizontal frames 34 are provided, two along each short side of the upper surface of the upper portion 24 and two along each long side. And each of the four horizontal frames 34 is attached in the state which can be removed separately.

  The tent 40 is a rectangular parallelepiped hollow body having an open lower end and is formed of a highly airtight material such as a fiber reinforced vinyl sheet. The entire periphery of the opening edge at the lower end of the tent 40 is the periphery of the bottom 22. It is joined to the outer peripheral side of 22A by an adhesive tape 42 in a sealed state. As a result, a sealed space 41 is formed by the tent 40 and the bottom portion 22.

  Moreover, the tent 40 can be crushed and folded by being formed of a flexible material. Furthermore, since the tent 40 is formed of a transparent or translucent material, the inside thereof can be visually recognized.

  A plurality of globes 44 are arranged on the side surface of the tent 40 at predetermined intervals in the vertical direction and the horizontal direction. Each globe 44 is a cylindrical member that is formed integrally with the side surface of the tent 40 and extends into the tent 40, and the tip of the cylindrical member has a shape resembling a hand. An operator can work in the tent 40 by inserting his arm into the glove 44.

  Further, the side portion of the tent 40 is locked to the vertical frame 32 of the support frame 30 by a string 46. The upper part of the tent 40 is locked to the horizontal frame 34 of the support frame 30 by a string 46.

  A ventilation device 52 is attached to the upper surface of the tent 40 via a HEPA filter. The ventilation device 52 maintains the sealed space 41 at a pressure lower than the atmospheric pressure by exhausting from the sealed space 41. Further, a drum can 56 is connected to the long side surface of the tent 40 via a communication tube 54. The communication tube 54 is formed of a material that can be cut at an intermediate portion of the tube and can be sealed by welding the cut portion.

  3 to 11 are side cross-sectional views for explaining a method for disassembling the glove box 20 according to the present embodiment. As shown in FIG. 3, the glove box 20 to be dismantled is installed on the floor 12.

  In this dismantling method, first, as shown in FIG. 4, the tent 40 is put on the glove box 20. At this time, the dismantling tool 50 is stored inside the tent 40. Since the lower end of the tent 40 is joined to the peripheral edge 22A of the bottom portion 22 of the glove box 20 in a later step, the dismantling tool 50 is not placed on the floor 12 but is hooked on the side surface of the glove box 20. It is hung by.

  Next, the support frame 30 is installed on the floor 12. Then, the upper portion of the tent 40 is locked to the horizontal frame 34 of the support frame 30 by the string 46, and the side portion of the tent 40 is locked to the vertical frame 32 of the support frame 30 by the string 46. Moreover, the ventilation apparatus 52 is attached to the upper surface of the tent 40 through a HEPA filter. In addition, a drum can 56 is connected to the long side surface of the tent 40 via a communication tube 54.

  Next, as shown in FIG. 5, the entire periphery of the opening edge at the lower end of the tent 40 is joined to the outer peripheral side of the peripheral edge 22 </ b> A that curves upward on the bottom 22 of the glove box 20 with the adhesive tape 42. Thereby, the sealed space 41 is formed by the tent 40 and the bottom portion 22, and the glove box 20 and the dismantling tool 50 are stored in the sealed space 41.

  Next, as shown in FIG. 6, the upper part 24 of the glove box 20 is disassembled by the dismantling tool 50 stored in the tent 40. That is, the glove box 20 is dismantled leaving the bottom 22. In this dismantling operation, the operator operates the dismantling tool 50 in a state where his / her arm is put in the glove 44, and dismantles by cutting or squeezing the upper part 24 of the glove box 20. Then, the dismantled product is discharged to the drum can 56 through the communication tube 54.

  Next, as shown in FIG. 7, the device 11 remaining in the sealed space 41 is disassembled with a disassembly tool 50. Then, the dismantled product is discharged to the drum can 56 through the communication tube 54. Thereby, only the dismantling tool 50 remains in the sealed space 41. Thereafter, the communication tube 54 is cut, and the cut port is welded and sealed by being heated under pressure. Further, the ventilation device 52 is removed from the upper surface of the tent 40.

  Next, as shown in FIGS. 8 and 9, the tent 40 is removed from the support frame 30 and reduced, and a tent 60 that houses the tent 40 and the bottom 22 is set up. First, as shown in FIG. 8, the bottom portion 22 of the glove box 20 that has been lightened by disassembling the upper portion 24 is lifted and floated from the floor surface 12, and the bottom portion of the tent 60 is formed between the bottom portion 22 and the floor surface 12. A tent sheet 62 is laid. Then, the bottom 22 is lowered onto the tent sheet 62.

  Next, as shown in FIG. 9, the tent upper part 64 that constitutes the upper surface and the side surface of the tent 60 is put on the tent 40. A plurality of globes 66 having the same configuration as the globe 44 are provided on the side surface of the tent upper portion 64. Next, the support frame 30 is removed, and a support frame 70 having a vertical frame 72 shorter than the vertical frame 32 of the support frame 30 is installed. Then, the upper part of the tent upper part 64 is locked to the horizontal frame 74 of the support frame 70 by the string 46, and the side part of the tent upper part 64 is locked to the vertical frame 72 of the support frame 70 by the string 46. And the lower end of the tent upper part 64 and the periphery of the tent sheet | seat 62 are welded. Thereby, the sealed space 61 is formed, and the tent 40, the bottom portion 22, and the dismantling tool 50 are stored in the sealed space 61.

  Next, as shown in FIG. 10, the bottom portion 22 and the tent 40 housed in the sealed space 61 are disassembled with the dismantling tool 50. In this dismantling operation, the operator cuts the tent 40 with his arm in the glove 66 and takes out the dismantling tool 50 therefrom. And the disassembly tool 50 is operated in the said state, and the bottom part 22 and the tent 40 are cut | disconnected or squeezed, etc., and it disassembles.

  Finally, as shown in FIG. 11, the tent 60 is reduced in volume by being crushed and folded, and discarded as radioactive waste together with the dismantled material therein. Further, the support frame 70 is removed. The support frame 70 and the support frame 30 used to set up the tent 40 can be reused.

  Further, the dismantling tool 50 remaining in the tent 60 which has been folded and reduced in volume can be reused. When the dismantling tool 50 is reused, the dismantling tool 50 remains sealed in the tent 60 that has been collapsed and reduced in volume, and is sealed in a sealed space 41 formed by the tent 40 and the bottom portion 22. Store. Then, the tent 60 is broken and the dismantling tool 50 is taken out from the tent 60. Thereby, the upper part 24 etc. of the glove box 20 can be disassembled by reusing the dismantling tool 50.

  As described above, in the disassembling method according to the present embodiment, the entire space of the opening edge portion of the tent 40 is joined to the bottom portion 22 of the glove box 20 so as to accommodate the upper portion 24 of the glove box 20. Form. Thereby, the upper part 24 can be disassembled in the sealed space 41 and discharged to the drum can 56 without lifting or moving the glove box 20 from the floor 12 that has been installed.

  Here, the glove box 20 is disassembled leaving only the bottom portion 22, and the upper surface of the bottom portion 22 contaminated with the radioactive substance is enclosed in a sealed space 41 formed by the bottom portion 22 and the tent 40. For this reason, the bottom 20 and the tent 40 can be lifted without leaking radioactive material. Then, with the bottom 20 and the tent 40 lifted, a tent sheet 62 can be laid under the tent sheet 62 to form a tent 60 composed of the tent sheet 62 and the tent upper part 64. The bottom 20 and the tent 40 can be disassembled in the sealed space 61.

  Therefore, according to the dismantling method according to the present embodiment, the glove box 20 whose inside is contaminated with the radioactive substance is dismantled on the floor surface 12 where the glove box 20 is installed without leaking the radioactive substance. Can do.

  Further, in the dismantling method according to the present embodiment, the bottom 20 and the tent 40 are lifted and a tent sheet 62 is laid below the tent sheet 62 and the tent upper part 64 is formed. The bottom 20 and the tent 40 are disassembled in the internal sealed space 61. Thereby, the whole glove box 20 including the bottom part 22 can be disassembled without leaking radioactive material.

  In the present embodiment, the bottom 20 and the tent 40 are disassembled in the sealed space 61 inside the tent 60 installed at the place where the glove box 20 was installed. However, it is also possible to remove the glove box 20 from the installation location of the glove box 20 together with the tent 40 and dispose of it as radioactive waste, by reducing the volume and reducing the weight of the glove box 20. In this case, a process from setting up the tent 60 shown in FIGS. 9 to 11 to removing it is unnecessary.

  12 to 15 are side sectional views for explaining a method for disassembling the glove box 20 according to another embodiment. As shown in FIG. 12, the glove box 20 to be disassembled is fixed on the base plate 14 </ b> A of the gantry 14.

  As shown in FIG. 13 and FIG. 14, in this disassembly method, the glove box 20 is housed in the sealed space 41 formed by the tent 40 and the bottom portion 22, as in the disassembly method according to the above-described embodiment. The glove box 20 is dismantled leaving only the bottom 22.

  Next, a tent 60 (see FIG. 9) that covers the tent 40 and the bottom 22 is set up. First, as shown in FIG. 15, after the bottom portion 22 is released from being fixed to the gantry 14, the bottom portion 22 is lifted by the jack 16 and floated from the upper surface of the gantry 14, and the gantry 14 is removed. Next, a tent sheet 62 is laid between the bottom 22 and the floor 12. Then, the bottom portion 22 is lowered onto the tent sheet 62 by the jack 16. Thereafter, the bottom 22 and the tent 40 are accommodated in the sealed space 61 formed by the tent 60 by a method similar to the disassembly method according to the above-described embodiment shown in FIGS. 9 to 11. Finally, the tent 60 is reduced in volume by being crushed and folded and discarded as radioactive waste. Further, the support frame 70 is removed.

  As described above, in the dismantling method according to the present embodiment, the upper portion of the glove box 20 is joined by joining the entire periphery of the opening edge of the tent 40 to the bottom 22 of the glove box 20 as in the above-described embodiment. A sealed space 41 for accommodating 24 is formed. Accordingly, the upper portion of the glove box 20 can be disassembled in the sealed space 41 and discharged to the drum can 56 without lifting or moving the glove box 20 from the installed base 14.

  Therefore, according to the disassembling method according to the present embodiment, the glove box 20 whose inside is contaminated with the radioactive substance can be disassembled on the mount 14 on which the glove box 20 is installed without leaking the radioactive substance. it can.

  Further, in the dismantling method according to the present embodiment, the bottom 20 and the tent 40 are lifted and a tent sheet 62 is laid under the same, and the tent sheet 62 and the tent upper portion 64 are configured. A tent 60 is formed, and the bottom 20 and the tent 40 are disassembled in a sealed space 61 inside the tent 60. Thereby, the whole glove box 20 including the bottom part 22 can be disassembled without leaking radioactive material.

  In the dismantling method according to the present embodiment, the gantry 14 is removed before the tent 60 is set up, but it is not essential, and the tent 60 may be set up on the gantry 14.

  16 to 21 are side cross-sectional views for explaining a method of disassembling the glove box 20 according to another embodiment. As shown in FIG. 16, the glove box 20 to be dismantled is fixed on the gantry 14. In this dismantling method, first, the tent 40 is put on the glove box 20. At this time, the dismantling tool 50 is hung on the side surface of the glove box 20.

  Next, the support frame 30 is installed on the floor 12. Then, the upper portion of the tent 40 is locked to the horizontal frame 34 of the support frame 30 by the string 46, and the side portion of the tent 40 is locked to the vertical frame 32 of the support frame 30 by the string 46. Moreover, the ventilation apparatus 52 is attached to the upper surface of the tent 40 through a HEPA filter. In addition, a drum can 56 is connected to the long side surface of the tent 40 via a communication tube 54.

  Next, as shown in FIG. 17, the entire periphery of the opening edge at the lower end of the tent 40 is joined to the outer periphery of the base plate 14 </ b> A of the gantry 14 with an adhesive tape 42. Thereby, the sealed space 41 is formed by the tent 40 and the base plate 14 </ b> A, and the glove box 20 and the dismantling tool 50 are stored in the sealed space 41.

  Next, as shown in FIG. 18, the upper part 24 of the glove box 20 is disassembled by the dismantling tool 50 stored in the tent 40. That is, the glove box 20 is dismantled leaving the bottom 22. Here, the bottom portion 22 is left because the bottom portion 22 is fixed to the base plate 14A and is later disassembled together with the gantry 14. Then, the dismantled product is discharged to the drum can 56 through the communication tube 54. Further, the device 11 remaining in the sealed space 41 is disassembled by the dismantling tool 50. Then, the dismantled product is discharged to the drum can 56 through the communication tube 54. Thereafter, the communication tube 54 is cut, and the cut port is welded and sealed by being heated under pressure. As a result, only the bottom 22 and the dismantling tool 50 remain in the sealed space 41.

  Next, as shown in FIGS. 19 and 20, a tent 60 that houses the gantry 14 and the tent 40 is set up. First, as shown in FIG. 19, the gantry 14 is lifted by the jack 16 and floated from the upper surface of the floor surface 12. Next, a tent sheet 62 is laid between the leg 14 </ b> B of the gantry 14 and the floor 12. Then, the gantry 14 is lowered onto the tent sheet 62 by the jack 16.

  Next, as shown in FIG. 20, the tent upper part 64 is put on the tent 40 and the gantry 14, and the entire periphery of the opening edge part of the tent upper part 64 is joined to the peripheral edge of the tent sheet 62. As a result, a sealed space 61 is formed, and the gantry 14, the bottom 22, and the tent 40 are accommodated in the sealed space 61.

  Next, as shown in FIG. 21, the gantry 14, the bottom 22, and the tent 40 are disassembled using a dismantling tool 50, and finally, the tent 60 is reduced in volume by being crushed and folded to disassemble the inside. Dispose as radioactive waste along with waste. Further, the support frame 70 is removed.

  As described above, in the dismantling method according to the present embodiment, the sealed space 41 that houses the glove box 20 is formed by joining the entire periphery of the opening edge of the tent 40 to the outer periphery of the base plate 14A of the gantry 14. Form. Accordingly, the glove box 20 can be disassembled in the sealed space 41 and discharged to the drum can 56 without being lifted or moved from the installed base 14.

  Here, the entire upper surface of the base plate 14A of the gantry 14 that is disassembled and discarded by the glove box 20 and contaminated with a radioactive substance is formed in a sealed space 41 formed by the base plate 14A of the gantry 14 and the tent 40. Contained. For this reason, the mount 14 and the tent 40 can be lifted without leaking radioactive material. Then, it is possible to lift the gantry 14 and the tent 40 and lay the tent sheet 62 under the tent sheet 62 to form the tent 60 composed of the tent sheet 62 and the tent upper part 64, and the sealed space inside the tent 60 At 61, the gantry 14 and the tent 40 can be disassembled.

  Therefore, according to the disassembling method according to the present embodiment, the glove box 20 whose inside is contaminated with the radioactive substance can be disassembled on the mount 14 on which the glove box 20 is installed without leaking the radioactive substance. it can.

  Further, in the dismantling method according to the present embodiment, the gantry 14 and the tent 40 are lifted and a tent sheet 62 is laid under the tent sheet 62 to form a tent 60 composed of the tent sheet 62 and the tent upper part 64. The gantry 14 and the tent 40 are disassembled in the internal sealed space 61. Accordingly, the base plate 14A of the gantry 14 that is contaminated with the radioactive substance when the glove box 20 is disassembled can be disassembled without leaking the radioactive substance.

  In the present embodiment, the gantry 14 and the tent 40 are disassembled in the sealed space 61 inside the tent 60 installed at the place where the glove box 20 was installed. However, it is also possible to remove the gantry 14 together with the tent 40 from the installation location of the glove box 20 and dispose of it as radioactive waste. In this case, the process from setting up the tent 60 shown in FIGS. 20 and 21 to removing it is unnecessary.

  In each of the above embodiments, the radioactive material may be applied to the inner surface of the tent 40 to prevent the radioactive material from diffusing, and the radioactive material adhered to the inner surface of the tent 40 may be fixed inside the tent 40. By this work, the effect of preventing leakage of radioactive material can be improved.

  22 to 26 are side cross-sectional views for explaining a method of disassembling the glove box 20 according to the first reference example. As shown in FIG. 22, in this dismantling method, first, the growth box 20 installed on the floor surface 12 is covered with a tent 40, and the dismantling tool 50 and the paint used for the below-described paint work are placed in the tent 40. Etc. Further, the support frame 30 is installed on the floor surface 12.

  Further, the entire periphery of the opening edge of the tent 40 is joined to the floor 12 in a sealed state with an adhesive tape or the like. Thereby, the sealed space 41 is formed by the tent 40 and the floor surface 12, and the glove box 20, the dismantling tool 50, the above-described paint and the like are stored in the sealed space 41. Moreover, the ventilation apparatus 52 is attached to the upper surface of the tent 40 through a HEPA filter. In addition, a drum can 56 is connected to the long side surface of the tent 40 via a communication tube 54.

  Next, as shown in FIG. 23, the upper part 24 of the glove box 20 is disassembled by the dismantling tool 50 stored in the tent 40, and the dismantled product is discharged to the drum can 56 through the communication tube 54.

  Next, the device 11 and the bottom 22 remaining in the sealed space 41 are disassembled by the dismantling tool 50, and the dismantled product is discharged to the drum can 56 through the communication tube 54. Thereafter, the communication tube 54 is cut, and the cut port is welded and sealed by being heated under pressure. Thereby, the dismantling tool 50 and the above-mentioned paint remain in the sealed space 41.

  Next, as shown in FIG. 24, the radioactive material adhering to the inner surface of the tent 40 and the floor surface 12 is applied to the inner surface of the tent 40 and the floor surface 12 by applying a coating material for preventing the diffusion of radioactive material. Fix it.

  Next, as shown in FIG. 25, the tent 40 is reduced in volume by being crushed and folded and discarded as radioactive waste. Further, the support frame 80 is removed.

  Finally, as shown in FIG. 26, the radioactive material fixed to the floor surface 12 is removed by peeling and removing the paint 13 applied to the floor surface 12.

  As described above, in the disassembling method according to the first reference example, the sealed space 41 for housing the glove box 20 is formed by joining the entire periphery of the opening edge of the tent 40 to the floor surface 12. Accordingly, the glove box 20 can be disassembled in the sealed space 41 and discharged to the drum can 56 without being lifted or moved from the floor 12 on which it is installed.

  Here, in the disassembling method according to the first reference example, radioactive material adheres to the floor 12 when the glove box 20 is disassembled. Moreover, since the lower end of the tent 40 is joined to the floor surface 12, when the tent 40 is removed, the inside of the tent 40 is unsealed. For this reason, before removing the tent 40 after dismantling the glove box 20, it is necessary to perform a painting operation to apply a coating material for preventing the diffusion of radioactive material to the floor 12 and the inside of the tent 40. Moreover, after removing the tent 40, the operation | work which peels and removes the coating material 13 apply | coated to the floor surface 12 is needed.

  On the other hand, according to the dismantling method according to the above-described three embodiments, when the glove box 20 is dismantled, the radioactive material does not adhere to the floor 12, and the lower end of the tent 40 is the glove box 20. Since it is joined to the bottom and the base plate 14A of the gantry 14, when the tent 40 is removed, the inside of the tent 40 is not unsealed. For this reason, the above-described painting work before dismantling the glove box 20 and before removing the tent 40 is not essential, and the above-described paint 13 peeling and removing work after removing the tent 40 is not necessary. Does not occur.

  27 to 30 are side cross-sectional views for explaining a method of disassembling the glove box 20 according to the second reference example. As shown in FIG. 27, in this dismantling method, the base 14 and the glove box 20 fixed thereon are released, and the glove box 20 is lifted by the jack 16 and floated from the base 14.

  Then, the gantry 14 is removed, and a tent sheet 62 is laid between the glove box 20 and the floor 12. Thereafter, the glove box 20 is lowered onto the tent sheet 62 by the jack 16.

  Next, as shown in FIG. 28, the glove box 20 is stored in a sealed space 61 formed by the tent 60, and as shown in FIG. 29, the glove box 20 and the device 11 stored therein are disassembled. . Finally, as shown in FIG. 30, the tent 60 is reduced in volume by being crushed and folded, and discarded as radioactive waste. Further, the support frame 70 is removed.

  As described above, in the dismantling method according to the second reference example, the glove box 20 is lifted, the tent sheet 62 is laid between the glove box 20 and the floor surface 12, and the tent upper part 64 is attached to the glove box 20. Then, a sealed space 61 for housing the glove box 20 is formed by joining the tent upper part 64 and the tent sheet 62 together. Accordingly, the glove box 20 can be disassembled in the sealed space 41 and discharged to the drum can 56.

  Here, in the dismantling method, it is necessary to lift the glove box 20 to be dismantled on the gantry 14 before setting up the tent 60 for storing the glove box 20. On the other hand, according to the dismantling method according to the above-described three embodiments, the tent 40 that houses the glove box 20 can be set up without lifting the glove box 20 from the floor surface 12 or the mount 14.

  In addition, the above-mentioned embodiment is for making an understanding of this invention easy, and does not limit this invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof. For example, you may comprise as follows.

  In the above-described embodiment, after the upper part or the whole of the glove box 20 is disassembled, the bottom part 22 or the gantry 14 of the glove box 20 is housed in the tent 60 and disassembled at that location. May be discarded together with the tent 40, or moved to another place and stored in the tent for dismantling.

  In the above-described embodiment, the entire periphery of the opening edge of the tent 40 is joined to the bottom 22 of the glove box 20, but it is not essential and may be joined to the upper side of the bottom 22. In the above-described embodiment, the lower end of the tent 40 and the bottom 22 of the glove box 20 or the base plate 14A of the gantry 14 are joined using the adhesive tape 42, but may be joined using an adhesive.

  Furthermore, although the case where the contaminated glove box is disassembled has been described in the above-described embodiment, the present invention is not limited to this, and other devices or equipment whose interior is contaminated with radioactive substances other than the contaminated glove box are disassembled. It can also be applied to cases.

10 Glove box dismantling device, 11 equipment, 12 floor, 14 mount, 14A base plate, 14B leg, 16 jack, 18 hook, 20 glove box (device or equipment contaminated with radioactive material inside), 22 bottom ( 22A peripheral edge, 24 upper part, 30 support frame, 32 vertical frame, 34 horizontal frame, 40 tent (demolition tent), 41 sealed space, 42 adhesive tape, 44 glove, 46 string, 50 Demolition tool, 52 Ventilator, 54 Communication tube, 56 Drum (storage container), 60 Tent (second dismantling tent), 61 Sealed space, 62 Tent sheet (tent bottom), 64 Tent top, 66 Globe, 70 Support Frame, 72 vertical frame, 74 horizontal frame

Claims (6)

A method of dismantling a device or facility that is internally contaminated with radioactive material,
The dismantling tent provided with a glove for dismantling work and opened on the bottom side is put on the device or equipment, and the entire periphery of the opening edge of the dismantling tent is joined to the device or equipment, thereby the dismantling tent. Forming a sealed space in the tent;
Using the glove, disassembling a portion of the device or facility stored in the sealed space, and storing the disassembled material in a radioactive waste storage container connected to the sealed space;
A dismantling method comprising: The step of disassembling the part remaining without being dismantled in the apparatus or facility and the dismantling tent in a sealed space in a second dismantling tent provided with a glove for dismantling work;
Removing the second dismantling tent containing the dismantling object;
The dismantling method of Claim 1 provided with. A portion that remains without being dismantled in the device or equipment is lifted, and a tent bottom portion that constitutes the bottom portion of the second dismantling tent is laid between the portion and the surface on which the device or equipment is installed. Process,
The upper part of the second dismantling tent constituting the upper part of the tent that is open at the bottom side is covered with the part that has not been dismantled in the apparatus or facility and the dismantling tent
Forming a sealed space in the second dismantling tent by joining the entire circumference of the opening edge of the tent top to the peripheral edge of the tent bottom;
The dismantling method according to claim 2, wherein the part that remains without being dismantled and the dismantling tent in the device or facility are stored in the sealed space in the second dismantling tent. A method of dismantling equipment or equipment that is contaminated with radioactive material and installed on a base,
A demolition tent provided with a glove for dismantling work and opened on the bottom side is put on the device or equipment, and the entire periphery of the opening edge of the demolition tent is joined to the gantry to Forming a sealed space in
Disassembling the device or equipment stored in the sealed space using the globe, and storing the disassembled material in a radioactive waste storage container communicated with the sealed space;
A dismantling method comprising: Storing the frame and the dismantling tent in a sealed space in a second dismantling tent provided with a dismantling work glove, and disassembling;
Removing the second dismantling tent containing the dismantling object;
The dismantling method of Claim 4 provided with these. Lifting the gantry and laying a tent bottom portion constituting the bottom of the second dismantling tent between the gantry and its installation surface;
Covering the tent and the dismantling tent with the tent upper portion, which constitutes the upper portion of the second dismantling tent and the bottom side is open,
Forming a sealed space in the second dismantling tent by joining the entire circumference of the opening edge of the tent top to the peripheral edge of the tent bottom;
The dismantling method according to claim 5, wherein the gantry and the dismantling tent are stored in the sealed space in the second dismantling tent.

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