JP2015010947A - Treatment facility for radioactive materials - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve work safety by safely carrying radioactive materials out of a nuclear reactor in a treatment facility for radioactive materials.SOLUTION: A treatment facility for radioactive materials places a treatment cell 61, whose surrounding area is airtightly formed by a radiation shield wall, in a room 51 at a ground level having the same height as a ground surface G in a reactor building 13, and connects the treatment cell 61 to an equipment hatch 54 of a reactor containment vessel 11.

Description

  The present invention relates to a radioactive substance processing facility for carrying out each radioactive substance in a reactor containment vessel or a reactor pressure vessel.

  Examples of nuclear power plants include a pressurized water reactor (PWR) and a boiling water reactor (BWR). Pressurized water reactor uses light water as a reactor coolant and neutron moderator, and makes high temperature and high pressure water that does not boil over the entire primary system, and sends this high temperature and high pressure water to a steam generator to generate steam by heat exchange, This steam is sent to a turbine generator to generate electricity. On the other hand, boiling water reactors use light water as a reactor coolant and neutron moderator, boil this light water at the core to generate steam, and send this steam directly to a turbine generator to generate electricity. is there.

  In such a nuclear reactor, the reactor containment vessel is erected on a solid ground such as a bedrock, and a plurality of compartments are partitioned inside by reinforced concrete. A reactor pressure vessel is suspended and supported at the center by a cylindrical concrete structure that defines the compartment, and a cavity is defined below the reactor pressure vessel. In this nuclear reactor, a plurality of fuel rods and a predetermined number of control rods are stored in a lattice shape in a reactor pressure vessel.

  When a severe accident occurs in a nuclear power plant configured in this way, the emergency core cooling system is activated to sufficiently remove the heat generated by cooling the core inside the reactor vessel. To do. However, if this emergency core cooling device fails, the core cannot be cooled, the core inside the reactor pressure vessel is melted, and a melted material such as molten fuel falls into the cavity. The melt is received by the cavity and cooled by cooling water to ensure safety. Thereafter, the melt that has been cooled and solidified and lowered to a predetermined temperature is stored in a dedicated storage container or the like and carried out to the outside.

  As a technique for allowing an operator to access the inside when the fuel is melted in the reactor containment vessel, for example, there is one described in Patent Document 1 below. In the remote operation method inside the reactor containment vessel described in Patent Document 1, the first partition is airtightly provided around the hatch in the work space, and the second partition is provided airtightly outside the first partition. The lid is removed and the work equipment is moved to the CRD storage space by a removal path to perform various operations.

JP 2013-117491 A

  In the remote operation method inside the conventional reactor containment vessel described above, the first partition is provided airtight around the hatch in the work space, the second partition is provided airtight outside the first partition, and inside the first partition. Various operations are performed. However, the melt in the reactor containment emits radiation, and even if double barriers are provided in an airtight manner, for example, it is not possible for the worker to work for a long time, so that safety is sufficient. It is difficult to secure the sex.

  The present invention solves the above-described problems, and an object of the present invention is to provide a radioactive material treatment facility that can improve the safety of work by safely carrying out the radioactive material inside a nuclear reactor.

  In order to achieve the above object, the radioactive substance processing facility of the present invention is provided with a processing cell in which a surrounding is formed airtight by a radiation shielding wall in a ground level room in a reactor building, and the processing cell is It is connected to the equipment hatch of the reactor containment vessel.

  Therefore, by installing a processing cell that is airtightly formed by a radiation shielding wall in a ground level room in the reactor building, various equipment can be carried in from the outside, and this processing cell can be easily installed in a short time. be able to. In addition, by connecting the processing cell to the equipment hatch, it becomes possible to access the inside of the reactor containment vessel through the equipment hatch from the processing cell that is shielded from the outside, and radioactive materials in the reactor containment vessel can be accessed. It can be processed safely. As a result, it is possible to improve work safety by safely carrying out radioactive materials inside the reactor.

  In the radioactive substance processing facility according to the present invention, the processing cell is configured by connecting a plurality of modules.

  Therefore, the processing cell is configured by connecting a plurality of modules, so that at the ground level in the reactor building, a plurality of modules are sequentially loaded and assembled from the outside into the internal room, and the radiation shielding wall A processing cell that is hermetically formed can be easily installed.

  In the radioactive substance processing facility according to the present invention, the plurality of modules include at least a maintenance module, a radioactive substance storage module, and a decontamination and inspection module.

  Therefore, by providing a maintenance module, a radioactive substance storage module, and a decontamination / inspection module, the radioactive substance can be properly stored in the container and safely carried out to the outside, improving the safety of work. be able to.

  In the radioactive substance processing facility of the present invention, the maintenance module, the radioactive substance storage module, and the decontamination and inspection module are connected in series, and an equipment carry-in module is connected to the maintenance module, The equipment removal module is connected to the decontamination and inspection module.

  Therefore, the space in the room can be used efficiently by connecting the three modules in series. Also, the radioactive material storage container is carried from the equipment carrying module through the maintenance module to the radioactive material storage module, where the radioactive material is stored in the storage container, and then decontaminated and inspected by the decontamination and inspection module. It will be carried out from the module for carrying out the equipment, and the radioactive material can be carried out efficiently. Furthermore, by providing a maintenance module, when a failure or the like occurs in a device in each module, it can be transported to the maintenance module for repair and the management cost of the device can be reduced. .

  In the radioactive substance processing facility according to the present invention, a transport device for transporting equipment is provided between the equipment carry-in module and the equipment carry-out module.

  Therefore, it is possible to transport the equipment between the equipment loading module and the equipment carrying out module by the transportation device, and not only the radioactive material storage container but also various kinds of equipment can be transported, thereby improving workability. Can do.

  In the radioactive substance processing facility of the present invention, an airtight door is provided between the modules.

  Therefore, when the radioactive substance storage module is used to store the radioactive substance in the storage container, the leakage of the radioactive substance to other modules can be suppressed as much as possible by the airtight door, thereby improving safety. be able to.

  In the radioactive substance processing facility according to the present invention, an exhaust device is provided in the radioactive substance storage module, and the pressure inside the equipment carrying-in module and the equipment carrying-out module is controlled.

  Therefore, by controlling the pressure in the equipment carry-in module and the equipment carry-out module by the exhaust device, radioactive materials are released to the outside when the equipment is carried in from the equipment carry-in module or when the equipment is carried out from the equipment carry-out module. Leakage can be prevented.

  In the radioactive substance processing facility according to the present invention, the maintenance module, the radioactive substance storage module, and the decontamination / inspection module are provided with a remote control manipulator capable of remotely controlling various processing operations from the outside. It is characterized by being able to.

  Therefore, in each module, various internal processing operations can be remotely operated from the outside using a remotely operated manipulator, and the worker can safely carry out the radioactive material carry-out operation.

  In the radioactive material processing facility of the present invention, a crusher for crushing molten fuel as a radioactive material is provided below the reactor pressure vessel, and is crushed from below the reactor pressure vessel to the equipment hatch through the pedestal opening. In addition, an unloading path for unloading the molten fuel is provided.

  Therefore, the molten fuel deposited on the bottom of the reactor containment vessel and the molten fuel deposited on the lower part of the reactor pressure vessel can be crushed by the crusher, and the crushed molten fuel is removed from the equipment hatch through the pedestal opening through the delivery path. It can be easily transported to the radioactive substance storage module.

  In the radioactive substance processing facility of the present invention, the crusher is provided horizontally, and its end is supported movably along a guide rail supported by the inner wall of the reactor containment vessel, The molten fuel at the lower part of the vessel or the molten fuel at the lower part of the reactor pressure vessel is accessible.

  Therefore, the crusher can be moved along the horizontal direction by the guide rail, and can access the molten fuel at the lower part of the reactor containment vessel and the molten fuel at the lower part of the reactor pressure vessel. The molten fuel can be crushed to a size that can be conveyed to the outside.

  According to the radioactive substance processing facility of the present invention, a processing cell whose periphery is hermetically formed by a radiation shielding wall is installed in a ground level room in a reactor building, and this processing cell is installed in a reactor containment vessel. Since it is connected to the hatch, the safety of work can be improved by safely carrying out radioactive materials inside the reactor.

FIG. 1 is a schematic cross-sectional view showing a radioactive material processing facility according to this embodiment. FIG. 2 is a schematic plan view showing a radioactive material processing facility. FIG. 3 is a schematic diagram showing details of a processing cell in a radioactive material processing facility. FIG. 4 is a schematic plan view showing a modification of the radioactive substance processing facility of the present embodiment.

  Exemplary embodiments of a radioactive substance processing facility according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

  FIG. 1 is a schematic cross-sectional view showing a radioactive substance processing facility according to the present embodiment, FIG. 2 is a schematic plan view showing the radioactive substance processing facility, and FIG. 3 shows details of a processing cell in the radioactive substance processing facility. FIG.

  The reactor of this embodiment uses light water as a reactor coolant and a neutron moderator, boil this light water at the core to generate steam, and send this steam directly to the turbine generator to generate electricity. It is a nuclear reactor.

  The nuclear power plant having the boiling water reactor has a reactor containment vessel 11 and a reactor 12 as shown in FIGS. The reactor containment vessel 11 is installed in the reactor building 13 and is sealed by attaching an upper lid 14 to the upper end portion. The reactor containment vessel 11 has a dry well 15 formed inside, and a pressure suppression chamber 16 in which a pressure suppression pool filled with cooling water is formed. The dry well 15 is connected to the pressure suppression chamber 16 via the vent passage 17, and the tip of the vent passage 17 is immersed in the cooling water of the pressure suppression pool.

  The reactor building 13 suspends and supports the reactor containment vessel 11, and a shield plug 18 that is divided into a plurality of parts and functions as a radiation shielding body is disposed above the upper lid 14. The storage container 11 is hermetically held.

  The nuclear reactor 12 includes a reactor pressure vessel 20 configured with an upper lid 19 attached thereto, a reactor core 21 loaded with a plurality of fuel assemblies containing nuclear fuel materials, a steam / water separator 22, a steam dryer 23, and the like. ing. In this case, the core 21, the steam separator 22, and the steam dryer 23 are arranged in the reactor pressure vessel 20. The reactor pressure vessel 20 has a core shroud 24 disposed therein and surrounds the core 21. The core 21 is loaded with a plurality of fuel assemblies, and the lower ends of the fuel assemblies are supported by a core support plate 25 and the upper ends are held by upper lattice plates (not shown). The steam / water separator 22 is disposed above the upper lattice plate, and the steam dryer 23 is disposed above the steam / water separator 22.

  The plurality of control rod guide tubes 26 are arranged below the core 21, and a support cylinder 27 is formed by each control rod guide tube 26. Control rods (not shown) that control the reactor power by being inserted into and removed from the fuel assemblies inside the reactor core 21 are disposed in the control rod guide tubes 26. The control rod drive mechanism housing 28 is attached to the lower mirror of the reactor pressure vessel 20, and a control rod drive mechanism (not shown) is disposed in the control rod drive mechanism housing 28. Connected to the control rod.

  The reactor pressure vessel 20 includes the above-described steam / water separator 22, steam dryer 23, upper lattice plate, core shroud 24, core support plate 25, control rod guide tube 26, support cylinder 27, etc. as the core structure. Is arranged.

  The reactor pressure vessel 20 is installed on a cylindrical pedestal 30 provided on a concrete mat 29 provided at the bottom of the reactor containment vessel 11. A cylindrical γ-ray shield 31 is installed at the upper end of the pedestal 30 and surrounds the reactor pressure vessel 20.

  Accordingly, the steam generated in the nuclear reactor 12 is sent to a steam turbine through a cooling water pipe (not shown), and the steam turbine is driven by the steam to generate power by a generator. The steam that has driven the steam turbine is cooled with seawater in the condenser to become condensed water, and is returned to the reactor 12 through the cooling water piping.

  By the way, when a severe accident occurs in such a nuclear power plant, the emergency core cooling device is operated, and the heat generated by cooling the core 21 inside the reactor pressure vessel 20 is sufficiently removed. However, if this emergency core cooling device fails, the core 21 cannot be cooled, the core 21 inside the reactor pressure vessel 20 is melted, and the melted M (M1, M2) such as molten fuel is atomic. It accumulates on the bottom of the furnace pressure vessel 20 or falls on the concrete mat 29 and is cooled and solidified by cooling water.

  When the core 21 is melted in this way and the melt M (M1, M2) is deposited on the bottom of the reactor pressure vessel 20 or the concrete mat 29, the melted M (M1, M2) solidified at a reduced temperature is externally applied. It is necessary to carry it out.

  The radioactive substance processing facility of the present embodiment is used to carry out the melt M (M1, M2) as the radioactive substance accumulated in the reactor pressure vessel 20 or the concrete mat 29 after the core 21 is melted. Is. In the radioactive substance processing facility of this embodiment, when there are solidified melts M1 and M2 in the reactor containment vessel 11, radiation can be shielded in the reactor building 13 and the radioactive substance is not scattered. The processing cell 61 that can be sealed as described above is installed to perform various operations.

  That is, in the reactor building 13, the reactor containment vessel 11 that supports the reactor 12 (reactor pressure vessel 20) is disposed at the center, and a room 51 having substantially the same height as the external ground G is formed outside thereof. Is provided. This room 51 is a space in which an operator can safely enter without being exposed to an explosion during normal operation of the nuclear power plant. This room 51 is provided with an opening / closing door 52 into which equipment and the like can be carried. The room 51 is provided with a communication passage 53 that penetrates the concrete structure wall and communicates with the reactor containment vessel 11, and the communication passage 53 can be opened and closed by an equipment hatch 54.

  In the radioactive substance processing facility, a processing cell 61 whose periphery is formed hermetically by a radiation shielding wall is installed in a ground level room 51 in the reactor building 13, and this processing cell 61 is installed in the reactor containment vessel 11. To the equipment hatch 54 (communication path 53). In this case, it is desirable to manufacture the processing cell 61 from reinforced concrete, and other materials such as tungsten, stainless steel, lead, and depleted uranium may be used.

  Here, the processing cell 61 will be described in detail. As shown in FIG. 3, the processing cell 61 is configured by connecting a plurality of modules. Specifically, the processing cell 61 has a maintenance module 62, a radioactive substance storage module 63, and a decontamination and inspection module 64. The maintenance module 62, the radioactive substance storage module 63, and the decontamination / inspection module 64 are arranged in series and in a straight line, and are connected to each other. The equipment loading module 65 is connected to the maintenance module 62. The equipment removal module 66 is connected to the decontamination and inspection module 64.

  The maintenance module 62 forms a space for repairing and inspecting various devices that have failed in each of the modules 62, 63, 64, 65 and 66. The maintenance module 62 is provided with an open / close shutter (open / close door) 71 on the entrance side, and a transfer conveyor (transfer device) 72 for transferring various materials inside. Further, the maintenance module 62 is provided with a remote operation type manipulator 73 capable of remotely operating various processing operations inside from the external room 51.

  The radioactive substance storage module 63 forms a space for storing the finely crushed melt M in the storage container V. The radioactive substance storage module 63 is provided with open / close shutters (open / close doors) 74 and 75 on the entrance side and the exit side, and a transport conveyor (transport device) 76 for transporting various equipment inside. Further, the radioactive substance storage module 63 is provided with a remote control manipulator 77 capable of remotely controlling various processing operations inside from the external room 51.

  The decontamination and inspection module 64 decontaminates the radioactive substance storage container V in which the melt M is stored and a lid is attached, and forms a space for inspecting leakage and the like. The decontamination and inspection module 64 is provided with an opening / closing shutter (opening / closing door) 78 on the outlet side, and a conveyor (conveying device) 79 for conveying various equipment inside. Further, the decontamination and inspection module 64 is provided with a remote operation type manipulator 80 capable of remotely operating various processing operations inside from the external room 51.

  The equipment carry-in module 65 is provided with an open / close shutter (open / close door) 81 at the entrance, and the equipment carry-out module 66 is provided with an open / close shutter (open / close door) 82 at the exit.

  Conveyors 72, 76, and 79 that convey the equipment between the equipment carry-in module 65 and the equipment carry-out module 66 are capable of carrying various kinds of equipment continuously. In addition, although the transport conveyors 72, 76, and 79 are provided as the transport device, the present invention is not limited to this configuration. For example, an overhead crane or a hoist may be used. In addition, although the open / close shutters 71, 74, 75, 78, 81, and 82 are provided as airtight open / close doors between the modules 62 to 66, the present invention is not limited to this configuration, and an air curtain or the like may be used.

  Further, the radioactive substance storage module 63 is provided with a connection path 83 that faces the opposite side of the remote control manipulator 77 and connects to the equipment hatch 54 (communication path 53) of the reactor containment vessel 11. The communication passage 53 of the reactor containment vessel 11 can be opened and closed by a device hatch 54. The device hatch 54 has an opening 84 formed inside, and can be opened and closed by an auxiliary hatch 85.

  The modules 62 to 66 are individually carried into the room 51 from the outside and assembled in the room 51. At this time, the conveyors 72, 76, 79, the open / close shutters 71, 74, 75, 78, 81, 82, and the remote control manipulators 73, 77, 80 may be mounted in the modules 62 to 66 in advance. desirable. And each module 62-66 is installed in the predetermined | prescribed position of the room 51, and it connects so that airtight may be maintained, without adjoining things.

  Further, the radioactive substance storage module 63 is provided with an exhaust line 86 as an exhaust device, and a radioactive substance removing filter 87 and a blower 88 are provided in the exhaust line 86. Therefore, by operating the blower 88 and sucking the inside of the radioactive substance storage module 63 from the exhaust line 86, the equipment carrying module 65 and the equipment carrying out via the maintenance module 62 and the decontamination and inspection module 64. The pressure is controlled by sucking the module 66.

  As shown in FIG. 1, the reactor containment vessel 11 is provided with an equipment hatch 54 (communication path 53), and the reactor pressure vessel 20 has an opening 91 formed in the pedestal 30 so as to face the equipment hatch 54. Yes. A slope 92 is installed from the equipment hatch 54 (communication path 53) of the reactor containment vessel 11 to the lower part of the reactor pressure vessel 20 through the opening 91 of the pedestal 30, and this slope 92 is used to transfer various equipment to the reactor containment vessel. 11 functions as a carry-in route for carrying in.

  A crusher 93 that crushes the molten fuel M (M1, M2) is provided in the pedestal 30 and below the reactor pressure vessel 20. The crusher 93 is provided horizontally, and its end is movably supported along a guide rail 94 supported by the inner wall of the reactor containment vessel 11 through the reactor pressure vessel 20. The crusher 93 has a cutting tool 95 extending upward or downward, and is accessible to the molten fuel M1 at the lower part of the reactor containment vessel 11 and the molten fuel M2 on the concrete mat 29. It can be cut finely.

  Although not shown, a power cable and a control cable are laid from the room 51 to the crusher 93 through the slope 92, and the operator can operate the crusher 93 by remote control. Further, a suction pipe 96 is extended from the radioactive substance storage module 63 through the slope 92 to the lower part of the reactor pressure vessel 20 (concrete mat 29), and the molten fuel M finely crushed is sucked into the radioactive substance storage module. Up to 63. The suction pipe 96 functions as a carry-out path for carrying out the molten fuel M. These power cables and suction pipes 96 are sealed through the auxiliary hatch 85 and extend to the radioactive substance storage module 63.

  Here, a method of installing the processing cell 61 will be described. In addition, when the radioactive substance has adhered to the room 51 in which the processing cell 61 is installed, the room 51 is decontaminated in advance. As shown in FIGS. 1 and 2, the modules 62 to 66 are individually manufactured and assembled in a factory (not shown), and are mounted on a truck A and carried into a room 51, for example. In this room 51, first, the radioactive substance storage module 63 is installed so as to be connected to the equipment hatch 54 (communication path 53) of the reactor containment vessel 11. Next, a maintenance module 62 and a decontamination / inspection module 64 are installed adjacent to the radioactive substance storage module 63, and are connected to the radioactive substance storage module 63 so as to maintain airtightness without a gap. The equipment loading module 65 and the equipment carrying out module 66 are installed adjacent to the maintenance module 62 and the decontamination / inspection module 64, and are connected so as to maintain airtightness without a gap. At this time, since the communication path 53 is closed by the equipment hatch 54, the operator can enter the modules 62 to 66 from the room 51 and perform various operations.

  Next, a method for carrying out the melt M (M1, M2) using the processing cell 61 will be described. As shown in FIGS. 1 and 3, when the processing cell 61 is installed, the operator can place the crusher 93, the guide rail 94, the suction pipe 96, etc. in the reactor containment vessel 11 through the slope 92 by remote control. And then assemble it in place. In this case, an opening 84 is formed in the equipment hatch 54, and an auxiliary hatch 85 is provided in the opening 84. Then, a power cable and a suction pipe 96 are disposed through the auxiliary hatch 85. Such work is preferably performed by remote control using a robot (not shown).

  When the crusher 93, the suction pipe 96, etc. are installed following the processing cell 61, the discharge of the melt M (M1, M2) is started in this state. The operator operates the crusher 93 remotely to cut and crush the molten fuel M2 on the concrete mat 29 with the cutting tool 95. When the molten fuel M <b> 2 on the concrete mat 29 is crushed, the molten fuel M <b> 2 is sucked by the suction pipe 96 and conveyed to the radioactive substance storage module 63.

  When the storage container V is loaded from the equipment loading module 65 in the processing cell 61, the storage container V is transported to the radioactive substance storage module 63 by the transport conveyors 72 and 76, and stops at a predetermined position. Here, the molten fuel M <b> 2 is stored in the storage container V using the remote control type manipulator 77. When a predetermined amount of molten fuel M2 is stored in the storage container V, a lid (not shown) is attached and sealed. The storage container V in which a predetermined amount of molten fuel M2 is stored is transported to the decontamination and inspection module 64 by the transport conveyors 76 and 79, where the surroundings of the storage container V are decontaminated and inspected for leakage or the like. After being done, it is unloaded from the equipment unloading module 66. Thereafter, the storage container V is transported to a storage facility by a truck (not shown).

  When the crushing of the molten fuel M2 on the concrete mat 29 is finished, the molten fuel M1 below the reactor pressure vessel 21 is then cut and crushed by the cutting tool 95. When the molten fuel M1 in the lower part of the reactor pressure vessel 21 is crushed, the molten fuel M1 is sucked by the suction pipe 96 and conveyed to the radioactive substance storage module 63. Then, in the processing cell 61, the molten fuel M1 is stored in the storage container V using the remote control manipulator 77 as described above.

  In the above description, as the processing cell 61, the maintenance module 62, the radioactive substance storage module 63, and the decontamination / inspection module 64 are arranged in series and in a straight line, and the maintenance module 62 has the equipment. Although the carry-in module 65 is connected and the equipment carry-out module 66 is connected to the decontamination and inspection module 64, the present invention is not limited to this configuration.

  FIG. 4 is a schematic plan view showing a modification of the radioactive substance processing facility of the present embodiment. As shown in FIG. 4, as the processing cell 101, a maintenance module 62, a radioactive substance storage module 63, and a decontamination and inspection module 64 are arranged in series and in an L shape. The equipment carrying module 65 may be connected, and the equipment carrying module 66 may be connected to the decontamination and inspection module 64. The combination shape and arrangement of the modules 62 to 66 may be appropriately set according to the shape of the room 51 and the position of the opening / closing door 52.

  As described above, in the radioactive material processing facility according to the present embodiment, the surroundings are airtightly formed by the radiation shielding wall in the room 51 at the ground level at the same height as the ground G in the reactor building 13. A cell 61 is installed, and the processing cell 61 is connected to the equipment hatch 54 of the reactor containment vessel 11.

  Therefore, by installing the processing cell 61 that is airtightly formed by the radiation shielding wall in the ground level room 51 in the reactor building 13, various equipment for the processing cell 61 can be easily supplied to the room 51 from the outside. It carries in, and this processing cell 61 can be installed in a short time. Further, by connecting the processing cell 61 to the equipment hatch 54, it becomes possible to access the inside of the reactor containment vessel 11 through the equipment hatch 54 from the processing cell 61 that is shielded from the outside, and to store in the reactor. The molten fuel M as a radioactive substance in the container 11 can be safely processed. As a result, it is possible to improve work safety by safely carrying out radioactive materials inside the reactor.

  In the radioactive substance processing facility of this embodiment, the processing cell 61 is configured by connecting a plurality of modules 62 to 66. Accordingly, at the ground level in the reactor building 13, a plurality of modules 62 to 66 are sequentially loaded and assembled from the outside into the internal room 51, and the processing cell 61 that is hermetically formed by the radiation shielding wall can be easily formed. Can be installed.

  In the radioactive substance processing facility of this embodiment, a maintenance module 62, a radioactive substance storage module 63, and a decontamination and inspection module 64 are provided as a plurality of modules. Therefore, it is possible to appropriately perform the storage work of the molten fuel M in the storage container V in the radioactive substance storage module 63, the decontamination work and the inspection work of the storage container V in the decontamination and inspection module 64, and the melting. The fuel M can be safely carried out to the outside in a safe state, and maintenance of various devices by the maintenance module 62 can improve work safety.

  In the radioactive substance processing facility of this embodiment, the maintenance module 62, the radioactive substance storage module 63, and the decontamination and inspection module 64 are connected in series, and the equipment carrying module 65 is connected to the maintenance module 62. The equipment removal module 66 is connected to the decontamination and inspection module 64. Therefore, the space in the room 51 can be used efficiently by connecting the three modules 62, 63, 64 in series. Further, the storage container V is carried into the radioactive substance storage module 63 from the equipment carry-in module 65 through the maintenance module 62, where the molten fuel M is stored in the storage container V, and then the decontamination and inspection module 64. This storage container V is decontaminated and inspected, and is carried out from the equipment carrying-out module 66, so that the molten substance M can be carried out efficiently. Furthermore, by providing the maintenance module 62, when a failure or the like occurs in the equipment in each of the modules 62 to 66, the maintenance module 62 can be transported to the maintenance module 62 for repair, thereby reducing the management cost of the equipment. Can be reduced.

  In the radioactive substance processing facility of this embodiment, transport conveyors 72, 76, and 79 for transporting equipment are provided between the equipment carry-in module 65 and the equipment carry-out module 66. Accordingly, it is possible to transport the equipment between the equipment carry-in module 65 and the equipment carry-out module 66 by the transport conveyors 72, 76, 79, and it is possible to transport not only the storage container V but also various kinds of equipment. Can be improved.

  In the radioactive substance processing facility of this embodiment, open / close shutters 71, 74, 75, 78, 81, 82 having airtightness are provided between the modules 62-66. Therefore, when the operation of storing the molten fuel M in the storage container V by the radioactive material storage module 63 is performed, leakage of the radioactive material to the adjacent modules 62 and 64 is suppressed as much as possible by the airtight opening / closing shutters 74 and 75. Can improve safety. In addition, double open / close shutters 71 and 81 are provided on the equipment carry-in module 65 side, and double open / close shutters 78 and 82 are provided on the equipment carry-out module 66 side, so that each module 65 and 66 is air-locked. As a result, the leakage of radioactive material to the outside can be suppressed, and safety can be improved.

  In the radioactive substance processing facility of this embodiment, an exhaust line 86 is provided in the radioactive substance storage module 63, and a radioactive substance removal filter 87 and a blower 88 are provided in the exhaust line 86. Therefore, by operating the blower 88 and sucking the inside of the radioactive substance storage module 63 from the exhaust line 86, the equipment carrying module 65 and the equipment carrying out are carried out via the maintenance module 62 and the decontamination and inspection module 64. Module 66 can be aspirated and pressure controlled. Therefore, when the equipment is carried in from the equipment carrying-in module 65 or when the equipment is carried out from the equipment carrying-out module 66, the internal air does not flow out, and leakage of radioactive materials to the outside can be prevented. it can.

  In the radioactive substance processing facility of the present embodiment, a remote operation type manipulator 73 capable of remotely operating various internal processing operations from the outside to the maintenance module 62, the radioactive substance storage module 63, and the decontamination and inspection module 64. , 77, 80 are provided. Accordingly, each module 62, 63, 64 can remotely control various internal processing operations from the outside using the remotely operated manipulators 73, 77, 80, and the operator can safely carry out the molten fuel M. Work can be done.

  In the radioactive material processing facility of the present embodiment, a crusher 93 for crushing the molten fuel M is provided below the reactor pressure vessel 20, and an equipment hatch 54 is provided from below the reactor pressure vessel 20 through the opening 91 of the pedestal 30. A suction pipe 96 is provided to carry out the molten fuel M crushed to the maximum. Therefore, the molten fuel M2 deposited on the bottom of the reactor containment vessel 11 and the molten fuel M1 deposited on the lower portion of the reactor pressure vessel 20 can be crushed by the crusher 93. It can be easily transported to the radioactive substance storage module 63.

  In the radioactive substance processing facility of the present embodiment, the guide rail 94 is installed on the inner wall of the reactor containment vessel 11 with the horizontal ends, and the crusher 93 is supported movably along the guide rail 94. The molten fuel M2 at the lower part of the reactor containment vessel 11 and the molten fuel M1 at the lower part of the reactor pressure vessel 20 can be accessed. Therefore, the crusher 93 can be moved along the horizontal direction by the guide rail 94, and the molten fuel M2 at the lower part of the reactor containment vessel 11 and the molten fuel M1 at the lower part of the reactor pressure vessel 20 are exposed to the outside. It can be crushed to a size that can be transported.

  In the above-described embodiment, the processing cells 61 and 101 are configured by the five modules 62, 63, 64, 65, and 66. However, the number and type of the processing cells 61 and 101 are not limited to this number, and the number is used as necessary. May be changed.

  In the above-described embodiments, the melt M (M1, M2) is applied as the radioactive substance. However, various members generated when the nuclear reactor plant is disassembled may be used.

  Further, in the above-described embodiments, the radioactive substance treatment facility of the present invention has been described as applied to a boiling water reactor, but it can also be applied to a pressurized water reactor, and any reactor can be used as long as it is a light water reactor. You may apply to.

11 Reactor containment vessel 12 Reactor 13 Reactor building 20 Reactor pressure vessel 21 Core 30 Pedestal 51 Room 52 Open / close door 53 Communication channel 54 Equipment hatch 61, 101 Processing cell 62 Maintenance module 63 Radioactive material storage module 64 Removal Dyeing and inspection module 65 Equipment carrying-in module 66 Equipment carrying-out module 71, 74, 75, 78, 81, 82 Opening / closing shutter 72, 76, 79 Conveyor 73, 77, 80 Remotely operated manipulator 91 Opening 92 Slope 93 Crusher 94 Guide rail 96 Suction tube (carrying path)
M (M1, M2) Melt V Storage container

Claims (10)

A processing cell is installed in the ground level room in the reactor building.
The processing cell is connected to an equipment hatch of a reactor containment vessel;
A facility for processing radioactive materials.   The radioactive substance processing facility according to claim 1, wherein the processing cell is configured by connecting a plurality of modules.   3. The radioactive substance processing facility according to claim 2, wherein the plurality of modules include at least a maintenance module, a radioactive substance storage module, and a decontamination and inspection module.   The maintenance module, the radioactive substance storage module, and the decontamination / inspection module are connected in series, and an equipment loading module is connected to the maintenance module, and the decontamination and inspection module is used to carry out the equipment. The radioactive substance processing facility according to claim 3, wherein modules are connected.   The radioactive substance processing facility according to claim 4, further comprising a transfer device that transfers the equipment between the equipment carry-in module and the equipment carry-out module.   6. The radioactive substance processing facility according to claim 3, wherein an airtight door is provided between the modules.   7. The apparatus according to claim 3, wherein an exhaust device is provided in the radioactive substance storage module, and pressure is controlled in the equipment carry-in module and the equipment carry-out module. 8. Radioactive material treatment equipment.   The maintenance module, the radioactive substance storage module, and the decontamination / inspection module are provided with a remote operation type manipulator capable of remotely controlling various processing operations inside from outside. The radioactive substance processing facility according to claim 7.   A crusher for crushing molten fuel as radioactive material is provided below the reactor pressure vessel, and an unloading path for carrying out the crushed molten fuel from below the reactor pressure vessel to the equipment hatch through the pedestal opening is provided. The radioactive substance processing facility according to any one of claims 1 to 8, wherein the facility is disposed.   The crusher is provided horizontally and has an end portion movably supported along a guide rail supported by the inner wall of the reactor containment vessel, and a molten fuel at the bottom of the reactor containment vessel, or The radioactive substance processing facility according to claim 9, wherein the molten fuel at a lower part of the reactor pressure vessel is accessible.

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