JP6301764B2 - Method of unloading nuclear equipment, unloading device thereof, and method of retrieving fuel debris - Google Patents

Description

  The present invention relates to a method for carrying out nuclear equipment, a carrying out apparatus for the same, and a method for taking out fuel debris, and more particularly to a method for carrying out nuclear equipment suitable for application to a boiling water nuclear power plant, a carrying out apparatus for the same, and a method for taking out fuel debris. .

  In general, in nuclear power plants, especially boiling water nuclear power plants, multiple emergency cooling facilities are provided to prevent core melt accidents so that the core in the reactor pressure vessel is always cooled even in an emergency. Measures are taken. However, although the probability is very small, it is assumed that the function of the emergency cooling facility is lost due to a severe accident and the core is melted.

  In such a case, it is possible that the fuel delivery equipment installed in the existing reactor building cannot be used, and it is assumed that normal fuel delivery work cannot be performed. It will be difficult to remove from the reactor pressure vessel.

  Patent Document 1 describes a nuclear fuel removal method in which core fuel can be easily removed even after a severe accident occurs in a boiling water reactor. In this Patent Document 1, a temporary building is installed so as to surround an existing reactor building provided with a boiling water reactor, a lifting device is attached to the temporary building, and a boiling water atom is used by using this lifting device. A nuclear fuel removal method is described in which a plurality of in-core structures installed above the core fuel in the reactor are sequentially removed and then the core fuel is taken out using the lifting device.

On the other hand, Patent Document 2, using the boring device attached to the installed supporting device in the reactor pressure vessel, a reactor pressure vessel in the gas environment is described a method to eject the molten nuclear fuel material Yes. In the method of taking out molten nuclear fuel material described in Patent Document 2, two work houses are stacked on the operation floor of the reactor building so as to cover the reactor well, and a shield plug covers the reactor well. The reactor containment vessel head, the reactor pressure vessel top cover, and the steam dryer and steam separator in the reactor pressure vessel are installed using the boring device installed on the operation floor and on the shield plug. A hole is opened, and the state of the core is observed by a camera inserted into the core through the hole. When the fuel assembly in the core is melted, a granular radiation shield is filled into the core through the hole.

  After that, the head of the reactor containment vessel surrounding the reactor pressure vessel is cut by the cutting device arranged in the work house, and the cut head is carried out. The top cover of the reactor pressure vessel is also removed. Further, the steam dryer and the steam separator in the reactor pressure vessel are also carried out after being cut by a cutting device arranged in the work house.

In the method to eject the molten nuclear fuel material described in Patent Document 2, by inserting the supporting device was installed boring device in the reactor pressure vessel, by installing the supporting device to the inner surface of the reactor pressure vessel Yes. The support device has a circular base, a turntable, four cylinders, and a slide base. The turntable is pivotally attached to the upper surface of the base, and the four cylinders are attached to the side surface of the base at equal intervals in the circumferential direction. A piston rod is attached to the piston disposed in each cylinder, and a pressing member is attached to the tip of each piston rod. Two guide rails are installed on the upper surface of the turntable and extend in the radial direction of the turntable. A slide base is movably attached to the guide rail, and a boring device is attached to the upper surface of the slide base.

Further, in Patent Document 2, the support device in which the boring device suspended from the overhead crane provided in the lower work house installed on the operation floor is lowered to a predetermined position in the reactor pressure vessel. It is, the pressing member of each piston rod end portion by operating the four cylinders are pressed against the inner surface of the reactor pressure vessel. As a result, the support device is held on the inner surface of the reactor pressure vessel. Thereafter, the molten nuclear fuel material present at the bottom of the reactor pressure vessel is taken out using a boring device.

  Further, Patent Document 3 describes a reactor building dismantling system for dismantling a nuclear reactor as a decommissioning reactor due to circumstances such as aging of a nuclear reactor or a natural disaster.

  Specifically, the reactor building is covered with a protection building that is divided into three parts, and an access gantry and an overhead traveling transport crane provided on the ceiling surface are provided inside the protection building. . It is described that the access gantry is provided with a radiation area surrounded by a shielding member that shields radiation to dismantle the reactor building.

  In Patent Document 3, when a nuclear reactor is dismantled, the reactor building is covered with a protective building to prevent the radioactive material from being scattered outside.

JP 2013-156133 A JP 2013-19875 A JP 2013-29334 A

  However, the fuel debris generated by the melting of the core described above is a product obtained by melting and hardening highly activated fuel and the internal structure of the reactor. It is important to consider prevention, etc. In the unlikely event that fuel debris is diffused, it will lead to work exposure and the spread of contamination to surrounding areas.

  On the other hand, in the method described in Patent Document 1, it is described that the reactor well is filled with water before removing the upper cover of the reactor containment vessel. However, the reactor well may not necessarily be filled with water. Therefore, there is room for improvement in worker safety when removing fuel debris from the RPV. Moreover, there is no description about prevention of the expansion of contamination of the generated secondary product, and there is room for further improvement in this respect.

In the method to eject the molten nuclear fuel material described in Patent Document 2, on the turntable of the installed supporting device in the reactor pressure vessel, toward the center of the turntable to the outer peripheral surface of the turntable radius An elongated through hole is formed in the direction, and a cutting device of a boring device installed on the slide base extends below the turntable through the through hole. When the molten nuclear fuel material present at the bottom of the reactor pressure vessel is being taken out using the boring device, radioactive dust is placed between the through holes and the circular base and the inner surface of the reactor pressure vessel. There is a risk of rising through the formed annular gap and reaching the work house installed on the operation floor.

  The air in the work house is purified by the ventilation air conditioning system provided in the work house to remove the radioactive dust that has reached the work house, but in order to check and repair the failed equipment in the work house, An employee needs to enter the work house. Although the radioactive dust is removed by the ventilation air conditioning system, if the radioactive dust adheres to the inner surface of the work house or the like, there is a possibility of being exposed by radiation from the radioactive dust.

  For this reason, in order to prevent molten nuclear fuel material by the boring device, specifically, radioactive dust generated by cutting fuel debris from rising to the work house, gaps formed between the constituent members constituting the above-described support device, and a circular shape It is conceivable to seal an annular gap formed between the base of the reactor and the inner surface of the reactor pressure vessel.

  However, since the reactor pressure vessel is a welded structure, even if an annular sealing member is attached to the side surface of the circular base of the support device, an annular ring formed between the circular base and the inner surface of the reactor pressure vessel is formed. It is difficult to completely seal the gap with the annular sealing member.

  Furthermore, in the reactor building demolition system described in Patent Document 3, by installing a protective building, radioactive materials that have been activated on the reinforced concrete frame or the reactor building frame at the time of demolition of the reactor building are removed. It is prevented from splashing outside the protective building.

  However, there is room for further improvement in the protection building, where radioactive dust generated during dismantling may adhere to the walls and ceiling of the protection building and increase the radiation dose in the protection building.

  The present invention has been made in view of the above points, and the object of the present invention is to suppress the influence of radiation on the surroundings when performing various operations when removing fuel debris from the reactor pressure vessel. Another object of the present invention is to provide a nuclear equipment carrying-out method, a carrying-out apparatus for the same, and a method for taking out fuel debris that can prevent the spread of radiation dust when carrying out the nuclear equipment.

In order to achieve the above object, the method for carrying out the nuclear equipment according to the present invention is arranged in the reactor well above the head of the reactor containment vessel and installed on the operation floor of the reactor building. A cutting / cleaning device for cutting and cleaning the shield plug, an isolation sheet for isolating or opening the shield plug, a pulling device for lifting the shield plug, and the shield plug. A step 1 of installing a shielding / removing device comprising a shielding body that shields the working space of the work house when shielding / cleaning with the cutting / cleaning device, and having a crane inside, The work of carrying out the work of lifting the shield plug pulled up by the lifting device of the shielding / removing device with the crane and placing it on the carriage A plurality of working houses, and step 2 to be installed above the shield and removal device, a cutting-cleaning apparatus the shield plug while isolating the working space and the reactor well in the shield having a work space After separating the shield plug with the pulling device, and with the pulling device lifting one of the shield plugs with the pulling device. Closing the isolation sheet and cleaning the shield plug with the cutting / cleaning device in a state separated from the work space by the shield, and further lifting the shield plug after the cleaning step 6; while opening the shield the nuclear reactor well and the working space by moving a step 7 which shields the working house and the reactor well, said sheet The process 8 is lifted in the work house with the crane, placed on the carriage and transported outside the work house, and the processes 4-8 are sequentially performed until all the remaining shield plugs are transported. And repeating step 9.

Further, in order to achieve the above object, the nuclear equipment carrying-out device of the present invention is arranged in the reactor well above the head of the reactor containment vessel and is installed on the operation floor of the reactor building. A device for carrying out a shield plug as a shield, a cutting / cleaning device for cutting and cleaning the shield plug, an isolation sheet for isolating and opening the shield plug, and a pulling device for lifting the shield plug And a shield that shields the work space of the work house when the shield plug is cut / washed by the cutting / cleaning device, and has a shield / take-out device installed above the shield plug and a crane inside. Before carrying out the work of lifting the shield plug pulled up by the lifting device of the shielding / removing device, lifting it with the crane and placing it on the carriage Has a working space, the shield and retrieval device is installed above the a work house, said shield in said cutting and cleaning apparatus said shield plug in the isolated state of the working space and the reactor wells And separating one of the divided shield plugs with the pulling device and pulling one of the shield plugs with the pulling device, and then separating the shield sheet. It washed the shield plug in said cutting and cleaning apparatus in a state of being isolated from the working space in the shield is closed, and further pulling the shield plug after its washing, the said working space by moving the shield while opening the reactor well, to shield the working house and the nuclear reactor well, and the working Howe said shield plug in the crane It is placed on the carriage by lifting within characterized by conveying to the work house outer.

  Furthermore, in order to achieve the above object, the fuel debris retrieval method according to the present invention comprises a reactor containment vessel head, a reactor pressure vessel top lid, after a shield plug is transported using the above nuclear equipment unloading method. In addition, the steam dryer and the steam separator installed in the reactor pressure vessel are sequentially removed, and then the fuel debris existing in the reactor pressure vessel is taken out using the fuel debris removal device.

  According to the present invention, it is possible not only to suppress the influence of radiation on the surroundings when performing various operations when removing fuel debris from the reactor pressure vessel, but also to increase the spread of radiation dust when the reactor equipment is carried out. Can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematic structure of the boiling water nuclear power plant to which Example 1 of the conveyance method of the nuclear equipment of this invention is applied. It is a figure which shows the state by which the shielding and taking-out apparatus and the 1st-1st work house were installed above the reactor building of the boiling water nuclear power plant of FIG. It is a figure which shows the detail of the 1st work house shown in FIG. It is a figure which shows the detail of the 2nd work house shown in FIG. It is a figure which shows the movement state of the trolley | bogie at the time of conveying a shield plug from the 1st work house shown in FIG. 3 to the 2nd work house shown in FIG. It is a figure which shows the detail of the shielding and taking-out apparatus shown in FIG. It is a figure which shows the operation state of the slide-type shield employ | adopted as this invention. It is a figure which shows the operation state of the folding type shield employ | adopted as this invention. It is a figure which shows the operation state of the anchor placement pulling apparatus employ | adopted as this invention. It is a figure which shows the operation state of the isolation sheet employ | adopted as this invention. It is a figure for demonstrating the installation state of each apparatus in Example 1 of the conveyance method of the nuclear equipment of this invention. It is a figure for demonstrating the cutting state of the shield plug in Example 1 of the conveyance method of the nuclear equipment of this invention. It is a figure for demonstrating the pulling-up state of the shield plug in Example 1 of the conveyance method of the nuclear equipment of this invention. It is a figure for demonstrating the cleaning state of the shield plug in Example 1 of the conveyance method of the nuclear equipment of this invention. It is a figure for demonstrating the movement state of the conveyance trolley in Example 1 of the conveyance method of the nuclear equipment of this invention. It is a figure for demonstrating the state which pulled up the shield plug in Example 1 of the conveyance method of the nuclear equipment of this invention in the 1st work house. It is a figure for demonstrating the state which carried out the bag packing of the shield plug in Example 1 of the conveyance method of the nuclear equipment of this invention. It is a figure for demonstrating the state which moved to the trolley | bogie from the state which packed the shield plug in Example 1 of the conveyance method of the nuclear equipment of this invention. It is a figure which shows the state which moved to the 2nd work house from the state of FIG. It is a figure which shows the state which carried out all the shield plugs in Example 1 of the conveyance method of the nuclear equipment of this invention. It is a figure which shows the washing | cleaning state by the cutting / cleaning apparatus in Example 2 of the conveyance method of the nuclear equipment of this invention. It is a figure which shows the injection | pouring state of the water stop agent by the cutting / washing apparatus provided with the water stop agent injection | pouring apparatus in Example 2 of the conveyance method of the nuclear equipment of this invention. It is a figure which shows the cutting state of the head of the reactor pressure vessel in Example 2 of the conveyance method of the nuclear equipment of this invention. It is a figure which shows the carrying-out state of the steam-water separator plug in Example 2 of the conveyance method of the nuclear equipment of this invention. It is a figure which shows the installation state of the opening-and-closing type shield in Example 2 of the conveyance method of the nuclear equipment of this invention. It is a figure which shows the carrying-out state of the cutting | disconnection and washing | cleaning apparatus provided with the water stopping agent injection | pouring apparatus in Example 2 of the conveyance method of the nuclear equipment of this invention. It is a figure which shows the carrying-out state of the conveyance trolley | bogie in the Example 2 of the conveying method of the nuclear equipment of this invention, an anchor placement pulling-up apparatus, and a slide type shield. It is a figure which shows the carrying-in state of the balance for lifting and the shield with a bag in Example 2 of the conveyance method of the nuclear equipment of this invention. It is a figure which shows the water injection state to the shield with a bag in Example 2 of the conveyance method of the nuclear equipment of this invention. It is a figure which shows the lifting state of the head of the reactor pressure vessel in Example 2 of the conveyance method of the nuclear equipment of this invention. It is a figure which shows the washing | cleaning (decontamination) state of the head of the reactor pressure vessel in Example 2 of the conveyance method of the nuclear equipment of this invention. It is a figure which shows the pulling-up state of the head of the reactor pressure vessel in Example 2 of the conveyance method of the nuclear equipment of this invention. It is a figure which shows the carrying-out state of the head of the reactor pressure vessel in Example 2 of the conveyance method of the nuclear equipment of this invention.

  Hereinafter, based on the illustrated embodiment, a method for carrying out nuclear equipment according to the present invention, a carrying-out apparatus thereof, and a method for taking out fuel debris will be described. In each figure, the same symbols are used for the same components.

  Example 1 of a method and apparatus for carrying out a nuclear power plant according to the present invention applied to a boiling water nuclear power plant will be described with reference to FIGS. To do.

  First, the schematic structure of the boiling water nuclear power plant of the present embodiment will be described with reference to FIG. As shown in the figure, the boiling water nuclear power plant 1 includes a nuclear reactor 2 and a reactor containment vessel 3. The reactor containment vessel 3 is installed in the reactor building 4 and is sealed with a head 5 attached to the upper end. The reactor containment vessel 3 has a dry well 6 formed therein and a pressure suppression chamber 7 in which a pressure suppression pool filled with cooling water is formed. One end of the vent passage 8 connected to the dry well 6 is immersed in the cooling water of the pressure suppression pool in the pressure suppression chamber 7. A shield plug 9, which is a radiation shield divided into a plurality of parts, is disposed immediately above the head 5 of the reactor containment vessel 3, and these shield plugs 9 are disposed in the reactor well 32 to operate the reactor building 4. It is installed on the floor (hereinafter referred to as “operation floor 29”).

  The nuclear reactor 2 includes a reactor pressure vessel 11 configured with an upper lid 10 attached thereto, a core 12 loaded with a plurality of fuel assemblies including nuclear fuel materials, a steam dryer 13 and a steam / water separator 14. . The core 12, the steam separator 14, and the steam dryer 13 are disposed in the reactor pressure vessel 11. A core shroud 15 installed in the reactor pressure vessel 11 surrounds the core 12. Each fuel assembly 16 loaded in the core 12 has a lower end supported by the core support plate 17 and an upper end held by the upper lattice plate 18. The steam / water separator 14 is disposed above the upper lattice plate 18 located at the upper end of the core 12, and the steam dryer 13 is disposed above the steam / water separator 14.

  A plurality of control rod guide tubes 19 are arranged below the core 12, and a support cylinder including the plurality of control rod guide tubes 19 is formed. Control rods (not shown) that are put into and out of the fuel assemblies 16 in the core 12 to control the reactor power are disposed in the control rod guide tubes 19. A plurality of control rod drive mechanism housings 21 are attached to the lower mirror 22 of the reactor pressure vessel 11. A control rod drive mechanism (not shown) is installed in each control rod drive mechanism housing 21 and connected to the control rod in the control rod guide tube 19. The steam dryer 13, the steam separator 14, the core shroud 15, the core support plate 17, the upper lattice plate 18, the support cylinder, the control rod guide tube 19, and the core shroud lower shell installed in the reactor pressure vessel 11 are It is a furnace internal structure.

  The reactor pressure vessel 11 is installed on a cylindrical pedestal 24 provided on a concrete mat 23 provided at the bottom of the reactor containment vessel 3. A cylindrical gamma ray shield 25 is installed at the upper end of the pedestal 24 and surrounds the reactor pressure vessel 11.

  The reactor building 4 is provided with a dryer / separator pool 26 and a spent fuel storage pool 27 for temporarily storing spent fuel so as to sandwich the reactor well 32. The dryer / separator pool 26 is used as a place for temporarily placing in-furnace structures such as the steam dryer 13 and the steam / water separator 14 during periodic inspection.

  Here, an outline of the form of the fuel debris 28 generated when the core melts in the boiling water nuclear power plant 1 will be described.

  For example, in the boiling water nuclear power plant 1, when the function of the cooling facility is lost and the cooling water is not injected into the reactor pressure vessel 11, the fuel pellets in the fuel assembly 16, the cladding tube, and the like are caused by the decay heat of the nuclear fuel. Melts. In this case, it is estimated that the molten nuclear fuel exists on the concrete mat 23 which is the position where it originally existed, the bottom of the reactor pressure vessel 11, or the bottom of the reactor containment vessel 3. The shield plug carry-out method and the carry-out device of the present embodiment are applied as work before carrying out the fuel debris 28 in such a state.

  Hereinafter, a shield plug carry-out device, which is a transfer device for nuclear equipment according to the present embodiment, will be described with reference to FIGS.

  As shown in FIG. 2, the shield plug carry-out device of this embodiment performs cutting and cleaning after the shield plug 9 is cut, and a cutting / cleaning device 43 that can move freely in the horizontal direction, and can move freely in the horizontal direction. The lift part can be moved up and down, the separation carriages 39 and 40 for isolating and opening the shield plug 9, the anchor placing lifting device 38 as a lifting device for lifting the shield plug 9, The shield plug 9 includes a sliding shield 41 and a foldable shield 42 that are shields that shield the work space when the shield plug 9 is cut and washed by the cutting / cleaning device 43, and is installed above the shield plug 9. The shield / take-out device (see FIG. 6) 31 and the first crane 33A inside, and the shield-up device pulled up by the anchor driving / lifting device 38 of the shield / take-out device 31 A first work house 30A having a work space in which the work 9 is lifted by the first crane 33A, placed on the carriage 37 and transported, and installed above the shielding / removal device 31; The second work house 30B and the third work house 30C arranged adjacent to the first work house 30A are schematically configured.

  As shown in FIG. 3, the first work house 30 </ b> A described above includes a first crane 33 </ b> A, a first muscular robot 34 </ b> A that is installed on the first crane 33 </ b> A and moves a beam, and a first crane. And a first balance 35A including a second muscular robot 34B which is lifted by 33A and moves a beam. As shown in FIG. 4, the second work house 30B is on the left side of the first work house 30A. The third work house 30C includes a second crane 33B, a third muscular robot 34C installed on the second crane 33B, and a carriage 37. The third work house 30C is a first work house 30A. And a third crane 33C and a fourth muscular robot 34D installed on the third crane 33C.

Then, as will be described in detail later, the divided shield plug 9a lifted by the first balance 35A via the first crane 33A of the first work house 30A is shown in FIGS. 5 (a) and 5 (b). As shown, the carriage 37 placed on the carriage 37 that has moved from the second work house 30B to the first work house 30A, and the carriage 37 on which the divided shield plug 9a is placed is moved from the first work house 30A. Te is intended to convey the second working house in 30B.

  The third work house 30 </ b> C is used when storing the storage pipe in the spent fuel storage pool 27. In addition, a soft material such as a gel material is used at the manipulator tips of the first muscle robot 34A, the second muscle robot 34B, the third muscle robot 34C, and the fourth muscle robot 34D. In addition, if a gel material having a function of being cured by applying a certain pressure or more to this soft material is used, the contact area at the tip is increased and it becomes easy to grip an irregular shape.

  Further, the shield includes a sliding shield 41 shown in FIG. 7 and a foldable shield 42 shown in FIG. 8, and at least the cutting / cleaning of the shield plug 9 by the cutting / cleaning device 43 and the anchor driving / lifting device. When the shield plug 9 is pulled up by 38, the sliding shield 41 is closed (see FIG. 7B), the reactor well 32 and the first work house 30A are shielded, and the folding type is also foldable. The shield 42 is opened (see FIG. 8A).

  Further, the anchor driving / lifting device 38 can freely move in the horizontal direction, and can expand and contract in the vertical direction as shown in FIG.

  Further, as shown in FIG. 10, the isolation sheet 39 can move along the support material, and can be opened and closed by this movement. On the other hand, the isolation sheet 40 is a sheet that is cylindrical and wraps the divided shield plug 9a. For example, the isolation sheet 40 is formed of a material that is coated with adhesive on one side and is in close contact with each other and is not easily peeled off. By bringing the sheets into close contact with each other, even if the sheet is torn, scattering of dust from the inside of the package can be suppressed.

  Further, the shield plug carry-out device of the present embodiment wraps the divided shield plug 9a suspended by the first balance 35A via the first crane 33A in a state where the sliding shield 41 is closed, and the bag It has a function of carrying out in the form of a pack 45.

  Next, a method for carrying out a shield plug, which is a method for carrying nuclear equipment according to the present embodiment, will be described with reference to FIGS.

In carrying out the shield plug of this embodiment, when the shield plug 9 is carried out, first, as shown in FIG. 11, the shielding / removing device 31 is placed on the operation floor 29 of the reactor building 4 above the shield plug 9. The first to third work houses 30A, 30B, 30C are installed above the shielding / removal device 31, and the anchor driving / lifting device 38 and the transport carriage 44 are installed, and the sliding shield 41 and Step 1 of installing the folding shield 42 and the isolation sheets 39 and 40, and cutting and cleaning the shield plug 9 while being separated from the inside of the first work house 30A by the slide shield 41 as shown in FIG. One of the divided shield plugs 9a in the state 2 in which the separation sheet 39 is opened as shown in FIG. 13 in the step 2 in which the device 42 divides into a plurality (three in this embodiment). The anchor placing and lifting device 38 pulls up, anchors one of the divided shield plugs 9a, attaches a lifting tool, lifts the anchor placing and lifting device 38, and lifts the divided shield plug 9a into the cutting / cleaning device 43. 14, and after lifting the anchor placing and lifting device 38, the isolation sheet 39 is closed and the slide type shield 41 is used to isolate the first work house 30 </ b> A. In this state, the shield plug 9a is cleaned by the cutting / cleaning device 43, and after the cleaning, as shown in FIG. 15, the isolation sheet 39 is opened and the shield plug 9a is further lifted by the anchor driving and lifting device 38. And move to the transport carriage 44 and move the folding shield 42 as shown in FIG. The first work house 30A is opened and the hook of the second muscular robot 34B of the first balance 35A is hung over the isolation sheet 40, and the shield plug 9a is placed in the first work house 30A. Step 6 of pulling up by the first crane 33A, and as shown in FIG. 17, the slide type shield 41 is moved to shield the inside of the reactor well 32 and the first work house 30A, and the inside of the first work house 30A. Then, in step 7, the shield plug 9a is sealed with the isolation sheet 40 in the bag pack 45 (the isolation sheet 40 is in close contact with the shield plug 9a), and as shown in FIG. Lowering the installation groove where the anchor driving / lifting device 38 or the like is installed, put it on the carriage 37 moved from the second work house 30B, and move the carriage 37 to the second work house 30B. As shown in FIG. 19, the shield plug 9a, which has been moved to the second work house 30B on the carriage 37, is packed in a bag pack 45 in a state of being isolated from the first work house 30A, as shown in FIG. and step 9 for conveying the work house 30B outside, as is shown in Fig 20, sequentially repeating the steps 2-9 until for transporting all the divided remaining shielded plug was, after all of the shield plug is conveyed The anchor placing and lifting device 38 and the transport carriage 44 are carried out in the step 10 for carrying out the same procedure as the shield plug carrying out procedure.

  By adopting such a configuration of the present embodiment, various operations when removing the fuel debris from the reactor pressure vessel are performed while being isolated, so that radiation when removing the fuel debris from the reactor pressure vessel is performed. In addition to suppressing the influence on the surroundings, it is possible to prevent the spread of radiation dust when the reactor equipment is carried out.

  Next, Example 2 of the present invention will be described with reference to FIGS. The present embodiment shown in the figure is an operation after all the shield plugs 9 described in the first embodiment have been carried out.

  That is, after all of the shield plug 9 has been transported outside the work house, the handrail 55 for work shown in FIG. 20 of the first embodiment is removed, and then, as shown in FIG. The nozzle of the cutting / cleaning apparatus 43A equipped with a nozzle is expanded and contracted to clean (decontaminate) the inner wall surface of the reactor well 32 and / or the half circumference of the upper surface of the head 5 of the reactor containment vessel 3, and further, a water stopping agent The nozzle of the cutting / cleaning device 43A equipped with the injection device is expanded and contracted to the opposite side, and the inner wall surface of the remaining reactor well 32 and / or the half circumference of the upper surface of the head 5 of the reactor containment vessel 3 is cleaned (decontamination). ) To clean the entire circumference.

  As described above, the cutting / cleaning device 43A is provided with a water-stopping agent injection device. As shown in FIG. 22, the water-stopping agent injection device covers the space between the reactor containment vessel 3 and the biological shielding wall. The water-stopping agent is injected into the bellows portion 54 arranged in this way half a round. The nozzle of the cutting / cleaning device 43A is expanded and contracted to the opposite side, and a water-stopping agent is injected into the remaining bellows portion half a round, and the water-stopping agent is injected all around.

  Next, as shown in FIG. 23, the side surface of the head 5 of the reactor containment vessel 3 is cut by the cutting / cleaning device 43A by AWJ or the like (performs a half circumference), and at a predetermined (60 °) pitch during the cutting. A fixing jig 48 for fixing the head 5 of the reactor containment vessel 3 is installed. Similarly, the arm of the cutting / cleaning device 43A is extended to the opposite side, and the side surface of the head 5 of the reactor containment vessel 3 is cut (performing the entire circumference).

  Next, as shown in FIG. 24, the water storage bag 51 and the cutting / cleaning device 50A are carried into the dryer / separator pool 26, and the steam / water separator plug 49 separating the dryer / separator pool 26 and the reactor well 32 is removed. Then, the removed steam-water separator plug 49 is moved to the second work house 30B by the carriage 37 and carried out. Thereafter, as shown in FIG. 25, an openable / closable shield 52 that shields between the dryer / separator pool 26 and the reactor well 32 is installed at the place where the steam-water separator plug 49 is installed.

  After the open / close shield 52 that shields between the dryer / separator pool 26 and the reactor well 32 is installed at the location where the steam-water separator plug 49 is installed, as shown in FIG. 43A is pulled up by the anchor placing and lifting device 38, the folding shield 42 is extended, the cutting / cleaning device 43A is temporarily placed on the folding shield 42, the sliding shield 41 is opened, and the first The cutting / cleaning device 43A is lifted by the first crane 33A in the work house 30A and packed in a bag, and then the bag-packed cutting / cleaning device 43A is placed on the carriage 37 and adjacent to the second work. It moves to the house 30B and is transported outside the second work house 30B.

  After the cutting / cleaning device 43A is transported out of the work house, as shown in FIG. 27, the transport carriage 44, the anchor driving / lifting device 38, and the sliding shield 41 are carried out in the same manner as the cutting / cleaning device 43A. Then, it is transported out of the second work house 30B.

  After the transport carriage 44, the anchor placing / lifting device 38 and the sliding shield 41 are transported to the outside of the second work house 30B, as shown in FIG. 28, the lifting balance 35B of the head 5 of the reactor containment vessel 3 and The shield 53 with bag 53 is carried into the first work house 30A, and then, as shown in FIG. 29, the lifting balance 35B of the head 5 of the reactor containment vessel 3 is placed in the first work house 30A. The crane 31 </ b> A is used to pour water into the bagged shield 53.

  Thereafter, as shown in FIG. 30, the isolation sheet 40 and the folding shield 42 are folded and opened, and in this state, the lifting balance 35B of the head 5 of the reactor containment vessel 3 is lowered to set the hook, The head 5 of the furnace containment vessel 3 is lifted.

  Thereafter, as shown in FIG. 31, the openable / closable shield 52 is pulled up, and the cutting / cleaning device 50A is introduced to clean (decontaminate) the head 5 of the reactor containment vessel 3 (to the cutting / cleaning device 50A). Suck the dust). After the cleaning, as shown in FIG. 32, the cutting / cleaning device 50A is returned into the dryer / separator pool 26, the openable / closable shield 52 is lowered, the head 5 of the reactor containment vessel 3 is raised, and the folding on the operation floor 29 is performed. The type shield 42 is closed. After closing the foldable shield 42, as shown in FIG. 33, the water in the bagged shield 53 is drained, and then the head 5 of the reactor containment vessel 3 is finally lifted to close the reactor containment vessel 3. The head 5 is packed in a bag, and the bag-packed head 5 of the reactor containment vessel 3 is placed on the carriage 37 and moves to the adjacent second work house 30B, and is transferred to the second work house outside 30B. The

  Then, after all the shield plugs 9 are transported as in the first embodiment and the head 5 of the reactor containment vessel 3 is transported as in the second embodiment, the upper lid 10 of the reactor pressure vessel 11 and the reactor pressure vessel The steam dryer 13 and the steam separator 14 installed in the reactor 11 are sequentially removed, and then the fuel debris 28 existing in the reactor pressure vessel 11 is taken out using the fuel debris removal device.

  The upper lid 10 of the reactor pressure vessel 11 and the steam dryer 13 and the steam separator 14 installed in the reactor pressure vessel 11 can be taken out by the method described in Patent Document 2, for example. Moreover, the fuel debris 28 existing in the reactor pressure vessel 11 using the fuel debris extraction device can be extracted by the method described in Japanese Patent Application No. 2014-99483, for example.

  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 ... Boiling water type nuclear power plant, 2 ... Reactor, 3 ... Reactor containment vessel, 4 ... Reactor building, 5 ... Head, 6 ... Dry well, 7 ... Pressure suppression room, 8 ... Vent passage, 9 ... Shield plug 9a ... split shield plug, 10 ... top lid, 11 ... reactor pressure vessel, 12 ... core, 13 ... steam dryer, 14 ... steam separator, 15 ... core shroud, 16 ... fuel assembly, 17 ... core support Plate 18, Upper lattice plate 19, Control rod guide tube 21, Control rod drive mechanism housing 22, lower mirror 23, concrete mat 24 pedestal 25 γ-ray shield 26, dryer separator Pool, 27 ... spent fuel storage pool, 28 ... fuel debris, 29 ... operating floor, 30A ... first work house, 30B ... second work house, 30C ... third work house, 31 ... shielding / removal device 32 ... Reactor well, 33A ... First crane, 33B ... Second crane, 33C ... Third crane, 34A ... First muscle robot, 34B ... Second muscle robot, 34C ... Third muscle robot 34D ... 4th muscular robot, 35A ... 1st balance, 35B ... Lifting balance, 37 ... Dolly, 38 ... Anchor placing and lifting device, 39, 40 ... Isolation sheet, 41 ... Sliding shield, 42 ... Folding shield, 43, 43A ... Cutting / cleaning device, 44 ... Conveyor cart, 45 ... Bag pack, 48 ... Fixing jig, 49 ... Air / water separator plug, 50A ... Cleaning device, 51 ... Water storage bag, 52 ... Openable / closable shield, 53 ... shield with bag, 54 ... bellows part, 55 ... handrail.

Claims (23)

When carrying out a shield plug, which is a radiation shield placed in the reactor well above the head of the reactor containment vessel and installed on the operation floor of the reactor building,
A cutting / cleaning device for cutting / cleaning the shield plug, an isolation sheet for isolating or opening the shield plug, a lifting device for lifting the shield plug, and a cutting / cleaning device for cutting the shield plug with the cutting / cleaning device A shield / take-out device comprising a shield that shields the work space of the work house when the work is installed, and a step 1 in which the shield plug is provided above the shield plug, and is lifted by the lifting device of the shield / take-out device. The work house having the work space for carrying out the work of lifting the shield plug with the crane and placing it on the carriage to be transported is installed above the shielding / removal device, and the work with the shielding body. and step 3 is divided into a plurality at the cutting and cleaning apparatus said shield plug in a state space that isolates the reactor well, said isolating sheet In a state where the shield plug is opened, the step 4 of pulling up one of the divided shield plugs by the pulling device, and after lifting one of the shield plugs by the pulling device, closing the isolation sheet, The step 5 of cleaning the shield plug with the cutting / cleaning device in a state separated from the work space by a shield, the step 6 of further lifting the shield plug after the cleaning, and the operation by moving the shield Step 7 for opening the space and the inside of the reactor well and shielding the inside of the reactor well and the work house, and lifting the shield plug into the work house with the crane and placing the shield plug on the carriage Step 8 for transporting outside the work house, and Step 9 for sequentially repeating Step 4-8 until all the remaining divided shield plugs are transported. The method of the carry-out nuclear equipment that characterized the Rukoto. In the method for carrying out the nuclear equipment according to claim 1,
The work house is disposed directly above the shielding / removal device, and includes a first work house having a first crane and a first muscular robot installed in the first crane, and the first work. disposed adjacent to house, the second crane, at least composed of a second working house having a second muscle robot and the carriage disposed to the second crane, the first of said first work House The shield plug lifted by the crane is placed on the carriage moved from the second work house, and then the carriage is moved from the first work house to the second work house. A method for carrying out nuclear equipment, characterized in that the nuclear equipment is transported inside . In the method for carrying out nuclear equipment according to claim 1 or 2,
The shield includes a slide-type shield and a fold-type shield, and at least the shield plug is cut and cleaned by the cutting / cleaning device and the shield plug is pulled by the pulling device. A method of carrying out nuclear equipment, wherein the shield of the type is closed to shield the inside of the reactor well and the work house, and the foldable shield is open. In the method for carrying out the nuclear equipment according to claim 3,
The shield plug is lifted by the crane in the work house in a state in which the sliding shield is opened and the folding shield is closed to shield the reactor well and the work house. A method for carrying out nuclear equipment. In the method for carrying out the nuclear equipment according to claim 4,
The method for carrying out nuclear equipment according to claim 1, wherein the shield plug suspended by the crane is packed in a bag with the sliding shield closed. The method for carrying out nuclear equipment according to claim 5 ,
The lifting device is moved with the isolation sheet open, the anchor is anchored to the shield plug, and the lifting device is used to lift the shield plug by attaching a lifting tool. A method of carrying out nuclear equipment, wherein the shield plug is cleaned by the cutting / cleaning device in a state where the shield plug is pulled up, the pulling device is pulled up, and the isolation sheet is closed. In the method for carrying out the nuclear equipment according to claim 6,
After the shield plug is washed by the cutting / cleaning device, the isolation sheet is opened, the shield plug is moved to the lifting conveyance carriage by the lifting device, the conveyance carriage is moved to close the separation sheet, and this state The folding shield is closed and the sliding shield is opened so that the shield plug is lifted by the crane in the work house and moved into the work house. How to carry out nuclear equipment. The method for carrying out nuclear equipment according to claim 7,
The shield plug is lifted by the crane in the work house and moved into the work house, and then the slide-type shield is closed. In this state, the shield plug is bag-packed, and then the bag-packed state. A method for carrying out nuclear equipment, wherein the shield plug is placed on the carriage and transported outside the work house. The method for carrying out nuclear equipment according to claim 8,
After transporting all of the shield plugs out of the work house, the nozzle of the cutting / cleaning device is expanded and contracted to clean the inner wall surface of the reactor well and / or the upper surface of the head of the containment vessel A method for carrying out nuclear equipment. The method for carrying out nuclear equipment according to claim 9,
The cutting / cleaning device is provided with a water-stopping agent injection device, and the water-stopping agent is injected into the bellows portion disposed so as to cover the space between the reactor containment vessel and the biological shielding wall. A method for carrying out nuclear equipment. The method for carrying out nuclear equipment according to claim 10,
The side surface of the reactor containment vessel head is cut by the cutting / cleaning device, and a fixing jig for fixing the reactor containment vessel head at a predetermined pitch is installed in the middle of the cutting, and the inside of the dryer / separator pool The water bag and the cutting / cleaning device are carried in, the steam / water separator plug separating the dryer / separator pool and the reactor well is removed, and the removed steam / water separator plug is moved to the work house by the carriage. Then, after that, an opening / closing type shield that shields between the dryer / separator pool and the reactor well is installed at a place where the steam-water separator plug is installed. How to carry out the equipment. The method for carrying out nuclear equipment according to claim 11,
After the open / close shield for shielding between the dryer / separator pool and the reactor well is installed at the place where the steam / water separator plug is installed, the cutting / cleaning device is pulled up by the pulling device. In addition, the foldable shield is extended to temporarily place the cutting / cleaning device on the foldable shield, and the sliding shield is opened and the cutting is performed by the crane in the work house. The cleaning device is lifted and packed in a bag, and then the bag-packed cutting / cleaning device is placed on the carriage, moved to the adjacent work house, and conveyed outside the work house. How to carry out nuclear equipment. The method for carrying out nuclear equipment according to claim 12,
After the cutting / cleaning device is transferred to the outside of the work house, the transfer carriage, the pulling device, and the sliding shield are transferred to the outside of the work house by the same unloading procedure as the cutting / cleaning device. A method for carrying out nuclear equipment. The method for carrying out nuclear equipment according to claim 13,
After transporting the transport carriage, the pulling device, and the sliding shield to the outside of the work house, the balance for lifting the head of the reactor containment vessel and the shield with bag are carried into the work house, and then In addition, the balance for lifting the head of the containment vessel is lifted by a crane in the work house, and water is poured into the shield with bag, and then the isolation sheet and the folding shield are opened, In this state, the balance for lifting the head of the containment vessel is lowered to lift the head of the containment vessel, and then the openable shield is pulled up, and the cutting / cleaning device is introduced to introduce the atomic device. The head of the furnace containment vessel is cleaned, and after this cleaning, the cutting / cleaning device is returned to the dryer / separator pool to lower the opening / closing shield, and the folding type After the shield is closed, the water of the shield with bag is drained, and after that, the head of the reactor containment vessel is finally lifted and the head of the reactor containment vessel is bag-packed. A method for carrying out nuclear equipment, wherein a head of a reactor containment vessel is placed on the carriage, moved to the adjacent work house, and conveyed to the outside of the work house. An apparatus for carrying out a shield plug, which is a radiation shield disposed in the reactor well above the head of the reactor containment vessel and installed on the operation floor of the reactor building,
A cutting / cleaning device for cutting / cleaning the shield plug, an isolation sheet for isolating or opening the shield plug, a lifting device for lifting the shield plug, and a cutting / cleaning device for cutting the shield plug with the cutting / cleaning device The work house has a working space and a shielding body that shields the shielding / removing device installed above the shield plug, and has a crane inside, and is lifted by the lifting device of the shielding / removing device. The work space for carrying out the work of lifting a shield plug with the crane and placing it on a carriage and carrying it, and a work house installed above the shielding / removal device,
The shield plug is divided into a plurality by the cutting / cleaning device in a state where the work space and the reactor well are separated by the shield, and the shield plug is divided in a state where the separation sheet is opened. After lifting one by the pulling device and pulling one of the shield plugs by the pulling device, the cutting and cleaning of the shield plug is performed with the isolation sheet closed and isolated from the working space by the shield. Cleaning with an apparatus, and further lifting the shield plug after the cleaning, moving the shield to open the work space and the reactor well, and shielding the reactor well and the work house; and The shield plug is lifted in the work house by the crane, placed on the carriage and transported outside the work house. Child force unloading apparatus of the equipment. In the nuclear equipment carrying-out apparatus according to claim 15,
The work house is arranged directly above the shielding / removal device, and is lifted by a first crane and a first muscular robot that moves a beam installed in the first crane, the first crane , A first working house comprising a second balance comprising a first balance comprising a beam on which the second muscular robot moves; a second crane disposed adjacent to the first working house; A third muscular robot installed on the second crane and a second work house having the carriage, and is lifted by the balance via the first crane of the first work house. to convey said shield plug, the second is placed on the carriage which has moved from the work house, said carriage to said first move from the working house the second work in the house Carry-out device of nuclear equipment and butterflies. The nuclear equipment carry-out device according to claim 16,
The nuclear equipment carry-out device, wherein the tips of the first, second and third muscular robots are formed of a gel material. The nuclear equipment carrying-out device according to any one of claims 15 to 17,
The shield includes a slide-type shield and a fold-type shield, and at least the shield plug is cut and cleaned by the cutting / cleaning device and the shield plug is pulled by the pulling device. An apparatus for carrying out nuclear power equipment, wherein a shield of the type is closed to shield the inside of the reactor well and the work house, and the foldable shield is open. The apparatus for carrying out nuclear power equipment according to claim 18,
The balance is opened via the crane in the work house in a state where the slide type shield is opened and the folding shield is closed to shield the inside of the reactor well and the work house. An apparatus for carrying out nuclear equipment, wherein the shield plug is suspended. In the nuclear equipment carrying-out apparatus according to claim 19,
An unloading device for nuclear equipment, comprising a bag pack for wrapping the shield plug lifted by the balance via the crane in a state in which the sliding shield is closed. In the nuclear equipment carrying-out apparatus according to any one of claims 15 to 20,
The apparatus for carrying out nuclear equipment according to claim 1, wherein the pulling device is movable in the horizontal direction and is extendable in the vertical direction. The nuclear equipment carry-out device according to any one of claims 15 to 21,
The separator is a nuclear equipment carrying-out device, wherein an adhesive is applied to one side of the separator sheet.   After the shield plug is transported using the nuclear equipment unloading method according to any one of claims 1 to 8, the shield plug is installed in the reactor containment vessel head, the reactor pressure vessel top lid, and the reactor pressure vessel. A method for removing fuel debris, comprising: sequentially removing the steam dryer and the steam separator, and then removing the fuel debris present in the reactor pressure vessel using a fuel debris removal device.

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