JP2016217988A - Nuclear power plant and extraction method for nuclear fuel material in the nuclear power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extraction method for a nuclear fuel material that has no possibility that dust scatters during the movement of fuel debris to contaminate the inside of a working house.SOLUTION: A nuclear power plant comprises at least: an access passage 7 that is formed to pass through a living body shield and a nuclear reactor containment 2 to enter the inside of the nuclear reactor containment and that has an air lock door; a device hatch 8 passing through the living body shield and the nuclear reactor containment 2; a first working house 10 connected to the access passage 7; and a second working house 11 connected to the device hatch 8. For taking out a nuclear fuel material in the nuclear power plant, a housing container 21 housing a molten nuclear fuel material (fuel debris) 4 obtained by melting and solidifying of the nuclear fuel material is placed in the second working house 11, and is moved inside a water sealing chamber 15B, in which water is sealed, to be taken out.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a nuclear power plant and a method for extracting nuclear fuel material in the nuclear power plant, and more particularly to a nuclear power plant suitable for extracting nuclear fuel material that has fallen out of a reactor pressure vessel in a reactor containment vessel by melting a core. The present invention relates to a method for extracting nuclear fuel material in a plant.

  In a boiling water nuclear power plant, a plurality of fuel assemblies containing nuclear fuel materials are loaded into the reactor core. A fuel assembly that has experienced operation of the reactor at a predetermined number of operation cycles after being loaded in the core is carried out of the reactor as a spent fuel assembly.

  By the way, in the unlikely event that an accident occurs in which the nuclear fuel material contained in the fuel assembly loaded in the reactor core melts, it is extremely difficult to carry out the molten nuclear fuel material from the reactor. It takes a long time to carry out melted and solidified (fuel debris).

  Patent Document 1 can be cited as a prior art document for taking out nuclear fuel material that has fallen out of the reactor pressure vessel in the reactor containment by melting the core.

  In Patent Document 1, when molten nuclear fuel material falls from the reactor pressure vessel to the internal space in the pedestal, it is formed from the radioactive waste treatment building to the side wall of the nuclear reactor building from the radioactive waste treatment building. The access passage is formed by the radiation shield toward the control rod drive mechanism hatch formed in the biological shield surrounding the reactor containment vessel through the opening, and the second radiation shielding chamber in the access passage is laterally formed. The articulated access device is moved, the molten nuclear fuel material (fuel debris) is crushed by the crusher at the tip of the articulated arm, and this fragment (fuel debris) is connected to the outside of the reactor containment vessel. It is described that it is housed in a storage container and a shielding container, and is gripped with a gripping tool provided at the tip of the articulated arm and taken out of the reactor containment vessel.

JP, 2014-070946, A

  However, in Patent Document 1 described above, the fuel debris accumulated at the bottom of the reactor containment vessel is taken out from the lateral direction of the reactor containment vessel, and the taken out fuel debris is inside the work house connected to the outside of the reactor containment vessel. However, when the fuel debris is transferred, dust may be scattered and the inside of the work house may be contaminated.

  The present invention has been made in view of the above points, and the object of the present invention is in a nuclear power plant and a nuclear power plant in which there is no risk of dust scattering during the transfer of fuel debris and the work house is not contaminated. It is to provide a method for extracting nuclear fuel material.

  In order to achieve the above object, a nuclear power plant according to the present invention includes a reactor pressure vessel containing a reactor core, a reactor containment vessel containing the reactor pressure vessel, and the reactor pressure inside the reactor containment vessel. A dry well installed so as to surround the vessel, a pressure suppression chamber installed at a lower portion of the reactor containment vessel, and having a pressure suppression pool for suppressing a pressure rise in the reactor containment vessel; A cylindrical pedestal installed on a concrete mat provided at the bottom of the reactor containment vessel, a biological shield surrounding the reactor containment vessel, and the living body An access passage having an air lock door, which is formed so as to penetrate the shield and the reactor containment vessel and enter the reactor containment vessel; in addition to the access passage, the biological shield and An equipment hatch penetrating the reactor containment vessel; a first work house connected to the access passage; and a second work house connected to the equipment hatch. A water-sealed chamber in which is sealed is installed, and a storage container storing molten nuclear fuel material (fuel debris) that has melted and solidified nuclear fuel material is moved out of the water-sealed chamber and carried out. To do.

  Further, in order to achieve the above object, a nuclear fuel material take-out method in a nuclear power plant of the present invention includes a reactor pressure vessel containing a reactor core, a reactor containment vessel containing the reactor pressure vessel, and the reactor A dry well installed in the containment vessel so as to surround the reactor pressure vessel, and a pressure suppression pool installed in the lower part of the reactor containment vessel to suppress the pressure rise in the reactor containment vessel A pressure suppression chamber, a reactor vessel is installed, a cylindrical pedestal installed on a concrete mat provided at a bottom of the reactor containment vessel, and surrounding the reactor containment vessel A biological shield, and an access passage that is formed so as to penetrate the biological shield and the reactor containment vessel and enter the reactor containment vessel, and includes an air lock door; In addition to the access passage, an equipment hatch penetrating the biological shield and the reactor containment vessel, a first work house connected to the access passage, and a second work house connected to the equipment hatch When taking out the nuclear fuel material in the nuclear power plant equipped, a storage container storing the molten nuclear fuel material (fuel debris) melted and solidified is installed in the second work house, and water is enclosed. It is characterized by being moved out of the water-sealed chamber.

  According to the present invention, there is no fear of dust scattering during the transfer of fuel debris, and the inside of the work house is not polluted, which is very effective for this kind of nuclear power plant.

It is a figure which shows the schematic structure of the boiling water type atomic co-plant to which the method for taking out nuclear fuel material in the nuclear power plant and nuclear power plant of the present invention is applied. It is a figure which shows the procedure of the taking-out method of the nuclear fuel substance in the nuclear power plant of this invention. It is a figure which shows the state which installed the 1st work house in the access channel | path side in Example 1 of the nuclear power plant of this invention. It is a figure which shows the state which installed the 2nd work house in the apparatus hatch side from the state of FIG. FIG. 5 is a diagram showing a state in which a working device is inserted into the PCV from the state of FIG. 4. It is a top view which shows the detail of the 1st and 2nd work house provided with the water seal chamber in Example 1 of the nuclear power plant of this invention. FIG. 7 is a side view of FIG. 6. It is a figure which shows the detail of the water seal chamber of the apparatus hatch side in FIG. It is a top view which shows the detail of the 1st and 2nd work house provided with the water seal chamber in Example 2 of the nuclear power plant of this invention. FIG. 10 is a side view of FIG. 9.

  Hereinafter, based on the illustrated embodiment, a nuclear power plant of the present invention and a method for extracting nuclear fuel material in the nuclear power plant will be described. In each figure, the same symbols are used for the same components.

  FIG. 1 shows a schematic structure of a boiling water type atomic plant to which a nuclear power plant of the present invention and a nuclear fuel material extraction method in the nuclear plant are applied.

  As shown in the figure, the boiling water nuclear plant in this embodiment includes a nuclear reactor and a reactor containment vessel (hereinafter referred to as PCV) 2. The PCV 2 is installed in the reactor building 1 and is sealed with an upper lid 2A attached to the upper end. The PCV 2 has a dry well 9 formed inside and an annular pressure suppression chamber 24 in which a pressure suppression pool filled with cooling water 23 is formed. One end of the vent passage connected to the dry well 9 is immersed in the cooling water 23 of the pressure suppression pool in the pressure suppression chamber 24. The pressure suppression chamber 24 is disposed in an annular torus chamber 26 formed in the reactor building 1.

  The nuclear reactor is composed of a reactor pressure vessel (hereinafter referred to as RPV) 3 having an upper lid 3A attached thereto, a core 27 loaded with a plurality of fuel assemblies containing nuclear fuel materials, and a steam / water separator (not shown). And a steam dryer (not shown). The core 27, the steam separator, and the steam dryer are disposed in the RPV 3. Each fuel assembly loaded in the core 27 has a lower end supported by the core support plate 28 and an upper end held by the upper lattice plate 29. The steam separator is disposed above the upper lattice plate 29, and the steam dryer is disposed above the steam separator.

  A plurality of control rod guide tubes 30 are disposed below the core support plate 28. Control rods (not shown) that are put into and out of the fuel assemblies in the core 27 and control the reactor power are arranged in the control rod guide tubes 30. A plurality of control rod drive mechanism housings 31 are attached to the lower mirror of the RPV 3. A control rod drive mechanism (not shown) is installed in each control rod drive mechanism housing 31 and connected to the control rod in the control rod guide tube 30.

  The RPV 3 is installed on a cylindrical pedestal 5 provided on a concrete mat 32 provided at the bottom of the PCV 2. A cylindrical γ-ray blocking body 33 is installed at the upper end of the pedestal 5 and surrounds the RPV 3. A pedestal opening 34 is formed in the pedestal 5, and communicates the dry well 9 in the PCV 2 with the internal space 35 formed in the pedestal 5. A plurality of control rod drive mechanism housings 31 extend from the lower mirror of the RPV 3 toward the internal space 35.

  A concrete cylindrical shield 6 that is a part of the reactor building 1 surrounds the PCV 2. An access passage 7 having an air lock door is provided so that an operator can enter the PCV 2 at the maintenance inspection performed after the operation of the boiling water atomic plant is stopped. It penetrates the shield 6 and the PCV 2 (see FIG. 3). In addition to the access passage 7, a control rod drive mechanism hatch 36 and a device hatch 8 shown in FIG. 3 are provided through the living body shield 6 and the PCV 2. The control rod drive mechanism hatch 36 extends to the side wall facing the radioactive waste treatment building 37 of the reactor building 1.

  The access passage 7 opens the air lock door, and the equipment hatch 8 and the control rod drive mechanism hatch 36 open the hatches to open the region 38 outside the PCV 2 and the dry well in the PCV 2 in the reactor building 1. 9 is contacted. During operation of the boiling water atomic plant, the airlock doors and their hatches are closed.

  An operation floor 39 is formed in the reactor building 1 above the PCV 2. A fuel storage pool 40 is formed surrounded by an operation floor 39, and cooling water is filled in the fuel storage pool 40. A plurality of spent fuel assemblies taken out from the core 27 are stored in the cooling water in the fuel storage pool 40.

  The reactor building 1 has a square cross section and four side walls. A radioactive waste treatment building 37 is disposed adjacent to the reactor building 1 and extends parallel to one side wall of the reactor building 1. A turbine building (not shown) is disposed adjacent to the other side wall of the reactor building 1 that is orthogonal to the side wall adjacent to the radioactive waste treatment building 37.

  In this embodiment, as shown in FIG. 3, the first work house 10 provided with the input device 17A is connected to the access passage 7 provided with the air lock door, whereas, as shown in FIG. The second work house 11 provided with the input device 17B is connected to the equipment hatch 8.

  As shown in FIGS. 6 and 7, the first work house 10 is provided with a water sealed chamber 15A in which water is sealed. In the water sealed chamber 15A, an air lock door of the access passage 7 is opened. This prevents dust generated from the fuel debris 4 (see FIG. 1) from leaking into the carry-in area 13 outside the first work house 10 when a working device 12 (see FIG. 5), which will be described later, is put into the PCV 2. It is out. On the other hand, as shown in FIGS. 6 and 7, the second work house 11 is provided with a water sealed chamber 15B in which water is sealed. In the water sealed chamber 15B, the device hatch 8 is opened to be described later. This prevents dust generated from the fuel debris 4 (see FIG. 1) from leaking into the carry-out area 19 outside the second work house 11 when carrying out the storage container 21 or the like in which the fuel debris 4 to be stored is stored. In the present embodiment, when passing through the water seal chamber 15B, it becomes a normal carry-out area (in the air).

  FIG. 8 shows details of the water seal chamber 15B on the equipment hatch 8 side.

  As shown in the figure, the water sealing chamber 15B is filled with water to the extent that the storage container 21 is sufficiently filled (hidden), and the room on the lower PCV2 side and the room on the carry-out area 19 side are separated by this water. The room on the upper PCV 2 side and the room on the carry-out area 19 side are separated by a wall 43. Further, since the water is filled so as to exceed the lower end of the wall 43, the dirty air on the PCV2 side does not leak to the carry-out area 19 side by the water seal chamber 15B in the state of FIG. Therefore, even if the storage container 21 is moved through the water in the water-sealed chamber 15B, the dirty atmosphere on the PCV 2 side does not leak to the carry-out area 19 side. It becomes possible. That is, the front partition wall is installed so as to ensure that the storage container that stores the molten nuclear fuel material (fuel debris) that has been melted and solidified from the nuclear fuel material can pass therethrough or that the working device can pass through. The structures of the water sealed chambers 15A and 15B are the same, and the water sealed chamber 15A is the same as in FIG.

  In the water seal chamber 15B, the first work single arm device 14a having one end fixed to the water seal chamber 15B above the internal water surface and the input device 17B moved upward, The storage container 21 in the charging device 17B transferred to the water seal chamber 15B by the device 14a is placed, and the first transfer device 41a moving in the water seal chamber 15B and the first transfer device 41a When the storage container 21 moves to a predetermined position in the chamber 15B, the first crane device 42 that lifts the storage container 21 from the water in the water-sealed chamber 15B and the storage container 21 lifted by the first crane device 42 are A second work single-arm device 14b for transporting to the carry-out area 19 connected to the side opposite to the side connected to the equipment hatch 8 of the work house 11 is provided.

  Further, the carry-out area 19 has a transfer container 20 having a shielding function in which the storage container 21 transferred to the carry-out area 19 is stored, and a transfer in which the storage container 21 is stored in a state separated from the water seal chamber 15B. A second crane device 44 that lifts or hangs the container 20 and moves it into the air by the second crane device 44, and a second transport device 41b that transports the transport container 20 moved into the air by the second crane device 44 to the outside of the building. And.

  In such a boiling water nuclear power plant, when the reactor is scrammed and the reactor power is reduced, all the power supply for supplying the current of the boiling water nuclear power plant disappears temporarily, and the emergency core cooling Assuming that the system has not been operated, all the power is lost, the pumps of the emergency core cooling system do not operate, and the cooling of each fuel assembly in the core 27 is impaired. There is a possibility that the nuclear fuel material contained in the fuel assembly is melted and the molten nuclear fuel material falls to the bottom of the RPV 3 and further falls onto the concrete mat 32 which is the bottom of the PCV 2.

  In the unlikely event that such molten nuclear fuel material falls onto the concrete mat 32, it is necessary to take out this molten nuclear fuel material to the PCV2.

  In the present embodiment, for example, in a boiling water type atomic plant where the nuclear fuel material has melted, the molten nuclear fuel material (fuel debris 4) that falls on the concrete mat 32 in the PCV 2 and exists inside the pedestal 5 is PCV2. In the following, a method for extracting nuclear fuel material in the atomic coplant of this embodiment will be described.

  The nuclear fuel material extraction method in the nuclear power plant of the present embodiment is such that the fuel debris 4 (see FIG. 1) at the bottom of the PCV 2 is gripped by the working device 12 that has been fed from the first work house 10 into the PCV 2 by the loading device 17A. (See FIG. 5), this is also stored in the storage container 21 that has been input into the PCV 2 by the input device 17A, and the storage container 21 in the PCV 2 is stored in the second work house 11 and is different from the input device 17A. (See FIGS. 6 and 7), installed in the second work house 11 and moved to the carry-out area 19 by moving the water-sealed chamber 15B in which water is sealed by the single arm device 14 for work. is there.

  The nuclear fuel material extraction method in this atomic coplant will be specifically described.

  That is, in the first work house 10, a loading device 17A that can be moved by the isolation sheet 18A in the vertical direction for loading the storage container 21 and / or the working device 12 into the PCV 2 is installed, and the second work house is provided. 11 is provided with a charging device 17B which can be moved by an isolation sheet 18B in the vertical direction for moving the storage container 21 storing the fuel debris 4 from the PCV 2 to the water seal chamber 15B (FIGS. 4 and 5). In the water-sealed chamber 15B, the first working single-arm device 14a whose one end is fixed to the water-sealed chamber 15B above the water surface inside the water-sealed chamber 15B in the state where the charging device 17B is moved upward. The storage container 21 in the charging device 17B transferred to the first transfer device 41a is placed on the first transfer device 41a and moved in the water seal chamber 15B. The first transfer device 41a holds the storage container 21 in the water seal chamber 15B. Moved to position The first crane device 42 lifts the storage container 21 from the water in the water sealed chamber 15B. The storage container 21 lifted by the first crane device 42 is moved to the second work house 11 by the second work single arm device 14b. It transfers to the carrying-out area 19 connected to the opposite side to the side connected with the apparatus hatch 8 (refer FIG. 8).

  Thereafter, in the carry-out area 19, the storage container 21 that has been transferred to the carry-out area 19 is stored in the transfer container 20 having a shielding function, and the transfer container in which the storage container 21 is stored in a state separated from the water seal chamber 15B. The container 20 is lifted by the second crane device 44 or suspended and moved into the air, and the transport container 20 moved into the air by the second crane device 44 is transported to the outside of the building by the second transport device 41b. Thus (see FIGS. 6 and 7), the fuel debris 4 is taken out.

  Further, in the present embodiment, as shown in FIG. 2, the storage container 21 in which the fuel debris 4 is stored (stuffed) is moved through the water-sealed chamber 15B of the second work house 11 and carried out of the building ( S9) Before the step (S1) of decontaminating the inside of the reactor building 1 and the surrounding area of the first work house 10 and the second work house 11, the inside of the reactor building 1, the first work house 10 and the first work house Step of removing interference around the installation location of the two work house 11 (S2), step of connecting the first work house 10 to the access passage 7 (S3) (see FIG. 3), and second work on the equipment hatch 8 The step of connecting the house 11 (S4) (see FIG. 4), and the step of introducing the working device 12 for taking out the fuel debris 4 and / or the storage container 21 for storing the fuel debris 4 into the PCV 2 (S5) (FIG. 5). FIG. 6) and the fuel depletion in the pedestal 5 A step (S6) of taking out the bristle 4 with the working device 12, a step (S7) of taking out the fuel debris 4 out of the pedestal 5 with the working device 12, and a step of filling the fuel debris 4 with the working device 12 (S8). Is to do.

  According to such a present Example, there is no possibility that dust will scatter during the transfer of the fuel debris 4, and the inside of the first work house 10 and the second work house 11 will not be contaminated. In addition, since the path along which the fuel debris 4 and the like moves is underwater (water-sealed chamber 15B), the work steps related to the insertion and removal of the fuel debris 4 in and from the PCV 2, the first work house 10, and the second work house 11 can be reduced. There is also an effect.

  9 and 10 show a second embodiment of the nuclear power plant of the present invention. The configuration of the present embodiment is substantially the same as that of the first embodiment, and here, differences from the configuration of the first embodiment will be described.

  In the present embodiment shown in the figure, the carry-out area 19 communicates with the water-sealed chamber 15B and is filled with water, and the shielding function for storing the storage container 21 transported into the water in the carry-out area 19 is stored. , A first transfer device 41a for transferring the storage container 21 in the water sealing chamber 15B, a second transfer device 41b for transferring the transfer container 20 in the carry-out area 19, and the water sealing chamber 15B. A second crane device 44 that lifts or hangs the transport container 20 in which the storage container 21 is stored and moves the container 20 into the air and transports it to the outside of the building.

  The transport container 20 in which the storage container 21 is stored in a state where the carry-out area 19 communicates with the water seal chamber 15B (a state where water is filled) is lifted or suspended by the second crane device 44. It moves in and is transported outside the building.

  Even with the configuration of this embodiment, the effect is the same as that of the first embodiment.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Reactor building, 2 ... Reactor containment vessel (PCV), 2A ... Upper cover of PCV, 3 ... Reactor pressure vessel (RPV), 3A ... Upper cover of RPV, 4 ... Fuel debris, 5 ... Pedestal, 6 ... Living body Shielding body, 7 ... Access passage, 8 ... Equipment hatch, 9 ... Dry well, 10 ... First working house, 11 ... Second working house, 12 ... Working device, 13 ... Loading area, 14 ... Working single arm device , 14a... 1st working single arm device, 14b... 2nd working single arm device, 14c... 3rd working single arm device, 15A, 15B... Water seal chamber, 17A, 17B. Separation sheet, 19 ... unloading area, 20 ... transport container, 21 ... storage container, 23 ... cooling water, 24 ... pressure suppression chamber, 26 ... torus chamber, 27 ... core, 28 ... core support plate, 29 ... upper lattice plate, 30 ... Control rod guide tube, 31 ... Control rod drive Housing 32 ... Concrete mat 33 ... Gamma ray shield 34 ... Pedestal opening 35 ... Internal space 36 ... Control rod drive mechanism hatch 37 ... Radioactive waste treatment building 38 ... PCV outer area 39 ... Operation Floor, 40 ... Fuel storage pool, 41a ... First transfer device, 41b ... Second transfer device, 42 ... First crane device, 43 ... Wall, 44 ... Second crane device.

Claims (15)

A reactor pressure vessel containing the reactor core, a reactor containment vessel for housing the reactor pressure vessel, a dry well installed in the reactor containment vessel so as to surround the reactor pressure vessel, and the reactor A pressure suppression chamber installed at a lower portion of the containment vessel and having a pressure restraint pool for suppressing a pressure increase in the reactor containment vessel; and the reactor pressure vessel is installed, and a bottom portion in the reactor containment vessel A cylindrical pedestal installed on a concrete mat provided in the body, a biological shield surrounding the periphery of the reactor containment vessel, the biological shield and the reactor containment vessel, and the reactor An access passage formed to enter the containment vessel and provided with an air lock door; in addition to the access passage, an equipment hatch penetrating the biological shield and the containment vessel; and Comprising a first work house connected to the access passageway, and a second working house that is connected to the equipment hatch,
The second work house is provided with a water-sealed chamber in which water is sealed, and a storage container containing molten nuclear fuel material (fuel debris) that has melted and solidified nuclear fuel material is moved through the water-sealed chamber. A nuclear plant characterized by being carried out. In the nuclear power plant according to claim 1,
The first working house is provided with a water-sealed chamber in which water is sealed, and the water-sealed chamber opens the air lock door of the access passage to connect the storage container and / or the working device to the reactor storage container. A nuclear power plant characterized in that dust generated from the reactor containment vessel is prevented from leaking out of the first work house when thrown into the reactor. In the nuclear power plant according to claim 1 or 2,
The nuclear power plant, wherein a carry-out area connected to a side opposite to a side connected to the equipment hatch of the second work house is in the air. In the nuclear power plant according to claim 1 or 2,
A nuclear power plant, wherein a carry-out area connected to a side opposite to the side connected to the equipment hatch of the second work house communicates with the water seal chamber and is filled with water. In the nuclear power plant according to claim 2,
In the first work house, a loading device that can move in the vertical direction for loading the storage container and / or the working device into the reactor containment vessel is installed, and in the second work house, A nuclear power plant characterized in that a loading device is installed that is movable in a vertical direction for moving the storage container storing the molten nuclear fuel material from the reactor storage container to the water seal chamber. In the nuclear power plant according to claim 5,
The water sealing chamber includes a first working single arm device having one end fixed to the water sealing chamber above an internal water surface, and the first working single arm device in a state where the charging device has moved upward. The storage container in the charging device transferred to the water seal chamber is placed on the first transfer device that moves in the water seal chamber, and the storage container is moved in the water seal chamber by the first transfer device. The first crane device that lifts the storage container from the water in the water-sealed chamber and the storage container lifted by the first crane device are connected to the equipment hatch of the second work house. A nuclear power plant comprising a second single-arm device for transporting to a carry-out area connected to a side opposite to the side on which the power is applied. In the nuclear power plant according to claim 6,
The unloading area suspends the transfer container having a shielding function for storing the storage container transferred to the unload area and the transfer container storing the storage container in a state of being separated from the water seal chamber. A second crane device that moves up and down and moves into the air, and a second transport device that transports the transport container moved into the air by the second crane device to the outside of the building. Nuclear plant. In the nuclear power plant according to claim 6,
The carry-out area communicates with the water-sealed chamber and is filled with water, and has a shielding container for storing the storage container that has been carried into the water in the carry-out area, and the water-sealed chamber A first transport device that transports the storage container, a second transport device that transports the transport container in the carry-out area, and the transport container in which the storage container is stored in communication with the water seal chamber. A nuclear power plant comprising: a second crane device that is suspended and moved into the air and conveyed outside the building.   In a room having one entrance and one exit, a partition wall is provided at a position where the entrance side and the exit side can be separated from each other, and the entrance surface and the exit side are not completely partitioned by the partition wall. The nuclear power plant is provided with a water seal chamber in which the partition wall is secured with a predetermined height from the inside and filled with water so as to exceed the lower end of the partition wall in the room . A reactor pressure vessel containing the reactor core, a reactor containment vessel for housing the reactor pressure vessel, a dry well installed in the reactor containment vessel so as to surround the reactor pressure vessel, and the reactor A pressure suppression chamber installed at a lower portion of the containment vessel and having a pressure restraint pool for suppressing a pressure increase in the reactor containment vessel; and the reactor pressure vessel is installed, and a bottom portion in the reactor containment vessel A cylindrical pedestal installed on a concrete mat provided in the body, a biological shield surrounding the periphery of the reactor containment vessel, the biological shield and the reactor containment vessel, and the reactor An access passage formed to enter the containment vessel and provided with an air lock door; in addition to the access passage, an equipment hatch penetrating the biological shield and the containment vessel; and A first work house connected to the access path, strikes the removal of the nuclear fuel material in the nuclear power plant having a second working house that is connected to the equipment hatch,
The storage container storing the molten nuclear fuel material (fuel debris), which is solidified by melting the nuclear fuel material, is moved out of the water-sealed chamber installed in the second work house and sealed with water. A method for extracting nuclear fuel material in a nuclear power plant. The method for extracting nuclear fuel material in a nuclear power plant according to claim 10,
The molten nuclear fuel material at the bottom of the reactor containment vessel is gripped by the working device introduced by the introduction device into the reactor containment vessel from the first work house, and the storage vessel introduced by the introduction device A water seal in which the storage container in the reactor containment vessel is carried out into the second work house by a charging device different from the charging device and is installed in the second working house and water is sealed. A method for taking out nuclear fuel material in a nuclear power plant, wherein the room is moved by a single arm device for work and carried out to a carry-out area. The method for extracting nuclear fuel material in a nuclear power plant according to claim 10 or 11,
Before the storage container storing the molten nuclear fuel material is moved out of the water-sealed chamber of the second work house and carried out, the reactor building and the surrounding areas of the first and second work houses are installed. A step of decontamination, a step of removing interferences around the reactor building and the installation locations of the first and second work houses, a step of connecting the first work house to the access passage, and the equipment Connecting the second working house to a hatch, inserting a working device for taking out the molten nuclear fuel material and / or a storage container for storing the molten nuclear fuel material into the reactor containment vessel, and in the pedestal Taking out the molten nuclear fuel material with the working device, taking out the molten nuclear fuel material out of the pedestal with the working device, and packing the molten nuclear fuel material with the working device. A method for extracting nuclear fuel material in a nuclear power plant. The method for extracting nuclear fuel material in a nuclear power plant according to any one of claims 10 to 12,
In the first work house, there is installed a loading device that can move in the vertical direction for loading the storage container and / or work device into the reactor containment vessel, and in the second work house A charging device is installed that is movable in the vertical direction to move the storage container storing the molten nuclear fuel material from the reactor containment vessel to the water seal chamber;
In the water-sealed chamber, the transfer device is moved into the water-sealed chamber by a first working single-arm device whose one end is fixed to the water-sealed chamber above the water surface in the state where the charging device is moved upward. The storage container in the charging device is placed on the first transfer device, moved in the water seal chamber, and moved to the predetermined position in the water seal chamber by the first transfer device. The storage container is lifted from the water in the water-sealed chamber, and the storage container lifted by the first crane device is connected to the equipment hatch of the second work house by a second single arm device. A method for removing nuclear fuel material in a nuclear power plant, wherein the nuclear fuel material is transferred to a carry-out area connected to the opposite side. The method for extracting nuclear fuel material in a nuclear power plant according to claim 13,
In the carry-out area, the storage container that has been transferred to the carry-out area is stored in a transfer container having a shielding function, and the transfer container in which the storage container is stored in a state separated from the water-sealed chamber is the first container. In a nuclear power plant, wherein the crane is suspended by a crane device and moved into the air, and the transport container moved into the air by the second crane device is transported outside the building by a second transport device. How to remove nuclear fuel material. The method for extracting nuclear fuel material in a nuclear power plant according to claim 13,
In the carry-out area, water is sealed in communication with the water-sealed chamber, and the storage container transported into the water in the carry-out area is stored in a transport container having a shielding function, and the water-sealed chamber The transport container in which the storage container is stored is communicated with the second crane device and is suspended in the air and moved into the air. The transport container moved into the air with the second crane device is 2. A method for extracting nuclear fuel material in a nuclear power plant, wherein the nuclear fuel material is transported outside a building by a transport device.

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