JP2015184176A - Water filling method in reactor pressure vessel in nuclear power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water filling method in a reactor pressure vessel for improving the work environment of an operator, by suppressing the influence of radiation on the surroundings when a fuel debris is taken from the reactor pressure vessel.SOLUTION: In carrying out a structure disposed in a reactor core, a shared device in which a plug attaching device 38 or a debris takeout device can be installed is inserted into a reactor pressure vessel 11, and the clearance between them is sealed. Then, a nozzle part of the reactor pressure vessel is blocked with a plug using the plug attaching device installed in the shared device. Then, water is filled into an upper part of the shared device.

Description

  TECHNICAL FIELD The present invention relates to a method for filling a reactor pressure vessel in a nuclear power plant, and more particularly to a reactor pressure in a nuclear plant that improves the safety of an operator when taking out fuel debris from the reactor pressure vessel (hereinafter referred to as RPV). It relates to the water filling method in the container.

  In general, in nuclear power plants, especially boiling water nuclear power plants, multiple emergency cooling facilities are provided so that the core in the RPV is always cooled even in an emergency, and measures are taken to prevent core melting accidents. It has been. 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. Is difficult to remove from the RPV.

  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.

JP 2013-156133 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.

  The present invention has been made in view of the above-described points, and the object of the present invention is to suppress the influence of radiation on the surroundings when performing various operations such as taking out fuel debris from the reactor pressure vessel, and It is intended to provide a method for filling a reactor pressure vessel in a nuclear power plant to improve the working environment.

  In order to achieve the above object, a water pressure filling method for a reactor pressure vessel in a nuclear power plant according to the present invention is a water pressure filling method for a reactor pressure vessel in a nuclear power plant. After unloading the separator, insert at least a common device in which a plug attachment device or a debris removal device can be installed into the reactor pressure vessel, and use the plug attachment device installed in the common device to After the nozzle part of the reactor is closed with a plug, the shared device is lowered to above the dismantling target device installed in the reactor pressure vessel and the space between the reactor pressure vessels located on the outer periphery of the shared device is sealed Water is spread above the shared device, and the device to be dismantled is taken out (cutting and dismantling).

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to suppress the influence on the circumference | surroundings by the radiation at the time of performing various operations, such as taking out fuel debris from the inside of a reactor pressure vessel, and it becomes possible to improve an operator's working environment.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematic structure of the boiling water nuclear power plant in which Example 1 of the water pressure filling method in a reactor pressure vessel in the nuclear power plant of this invention is applied. It is a figure which shows the arrangement | positioning of the structure and nozzle in RPV of the boiling water nuclear power plant of FIG. It is an example of the work flowchart of the water pressure filling method in the reactor pressure vessel in the nuclear power plant of this invention. It is a figure which shows the state which inserts the common apparatus with which the debris extraction apparatus was installed in RPV of the boiling water nuclear power plant of FIG. 1, and cuts and disassembles an upper lattice board. It is a figure which shows the state which inserted the common apparatus with which the plug attachment apparatus was installed in RPV of the boiling water nuclear power plant of FIG. It is a figure which shows the detail of the plug attachment apparatus in Example 1 of FIG. It is a figure which shows Example 1 of the water filling method in the reactor pressure vessel in the nuclear power plant of this invention, and shows the state which carried in the common apparatus to the plug attachment location. It is a figure which shows the state which carried the plug attachment apparatus into the shared apparatus from the state of FIG. It is a figure which shows the state which inserted the plug attachment apparatus into the sub turning table seal from the state of FIG. It is a figure which shows the state which made the shielding port the open state from the state of FIG. It is a figure which shows the state which seated the plug attachment apparatus in the sub turning table from the state of FIG. It is a figure which shows the state which turns a main turning table from the state of FIG. 11, and positions a plug attachment. It is a figure which shows the state which turns a sub turning table from the state of FIG. 12, and positions a plug attachment apparatus. It is a figure which shows the state of plug reception from the state of FIG. It is a figure which shows the state which carries in a plug in RPV by a raising / lowering mechanism from the state of FIG. It is a figure which shows the change state of the attitude | position by a turning mechanism from the state of FIG. It is a figure which shows the state rotated 180 degrees by the rotation mechanism from the state of FIG. It is a figure which shows the plug attachment state by a plug pressing mechanism from the state of FIG. It is a figure which shows the state which returned each operation | movement mechanism of the plug attachment apparatus into the plug attachment apparatus after plugging a nozzle part with a plug. It is a figure which shows the state which raised the plug attachment apparatus from the state of FIG. It is a figure which shows the state which made the shielding port the closed state from the state of FIG. It is a figure which shows the state which carried out the plug attachment apparatus from the common apparatus from the state of FIG. It is a figure which shows the state which inserted the common apparatus with which the plug attachment apparatus was installed in RPV of the boiling water nuclear power plant to which Example 2 of the water pressure filling method in the reactor pressure vessel in the nuclear power plant of this invention is applied. It is a figure which shows the detail of the plug attachment apparatus in Example 2 of FIG. It is a figure which shows Example 2 of the water filling method in the reactor pressure vessel in the nuclear power plant of this invention, and shows the state which carried in the common apparatus to the plug attachment location. It is a figure which shows the state which carried the plug attachment apparatus into the shared apparatus from the state of FIG. It is a figure which shows the state which inserted the plug attachment apparatus into the sub turning table seal from the state of FIG. It is a figure which shows the state which made the shielding port the open state from the state of FIG. It is a figure which shows the state which seated the plug attachment apparatus to the sub turning table from the state of FIG. It is a figure which shows the state which turns the main turning table from the state of FIG. 29, and positions a plug attachment. It is a figure which shows the plug attachment state by a plug pressing mechanism from the state of FIG. It is a figure which shows the state which plugged the nozzle part with the plug and returned the plug holding mechanism and the plug pressing mechanism into the plug mounting device. It is a figure which shows the state which raised the plug attachment apparatus from the state of FIG. It is a figure which shows the state which made the shielding port the closed state from the state of FIG. It is a figure which shows the state which carried out the plug attachment apparatus from the common apparatus from the state of FIG.

  Hereinafter, a method for filling a reactor pressure vessel in a nuclear power plant according to the present invention will be described with reference to the illustrated embodiment. In each figure, the same symbols are used for the same components.

  A first embodiment of the water pressure filling method in a reactor pressure vessel in a nuclear power plant of the present invention applied to a boiling water nuclear power plant will be described with reference to FIGS.

  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 (hereinafter referred to as PCV) 3. The PCV 3 is installed in the reactor building 4 and is sealed with an upper lid 5 attached to the upper end. The PCV 3 has a dry well 6 formed inside 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 shielding body divided into a plurality of parts, is disposed directly above the upper lid 5 of the PCV 3, and these shield plugs 9 are installed on the operation floor of the reactor building 4 (hereinafter referred to as “operation floor 29”). Yes.

  The nuclear reactor 2 includes a reactor pressure vessel (hereinafter referred to as RPV) 11 having a top cover 10 attached thereto, a core 12 loaded with a plurality of fuel assemblies containing nuclear fuel materials, a steam dryer 13 and a steam / water separator. A container 14 is provided. The core 12, the steam / water separator 14, and the steam dryer 13 are disposed in the RPV 11.

  Details of the nuclear reactor 2 will be described with reference to FIG. FIG. 2 shows a state where the steam dryer 13 and the steam separator 14 are removed.

  As shown in the figure, a core shroud 15 installed in the RPV 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 RPV 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. A plurality of jet pumps 57 are arranged on the circumference of the support cylinder.

  The RPV 11 is connected to a number of nozzle pipes from the inner wall surface. As an example from above the RPV 11, the main steam nozzle 41C, the emergency condenser nozzle 41D, the water supply nozzle 41F, the CS nozzle 41G, the recirculation inlet nozzle 41B, the recirculation outlet nozzle 41A, the measurement nozzle 41E, etc. have different height levels. In addition, there are a plurality of nozzles 41A-41G on the circumference of the RPV 11.

  Moreover, RPV11 is installed on the cylindrical pedestal 24 provided on the concrete mat 23 provided in the bottom part in PCV3. A cylindrical γ-ray shield 25 is installed at the upper end of the pedestal 24 and surrounds the RPV 11.

  The reactor building 4 has a dryer / separator pool (hereinafter referred to as DSP) 26 and a spent fuel storage pool (hereinafter referred to as SFP) 27 for temporarily storing used fuel so as to sandwich the reactor well. Is provided. The DSP 26 is used as a place for temporarily placing in-furnace structures such as the steam dryer 13 and the steam separator 14 during periodic inspection.

  Next, 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 RPV 11, the fuel pellets and the cladding tube in the fuel assembly 16 are melted by the decay heat of the nuclear fuel. 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 furnace bottom of the RPV 11, or the bottom of the PCV 3. The water pressure filling method in the reactor pressure vessel in the nuclear power plant of this embodiment is applied when carrying out the fuel debris 28 in such a state.

  The procedure of the water pressure filling method in the reactor pressure vessel of the present embodiment will be described with reference to FIGS.

  In this embodiment, a common device 39 in which a plug mounting device 38 or a debris extraction device 58 (see FIG. 4), which will be described later, can be installed in the RPV 11 is inserted into the RPV 11, and an upper outer peripheral seal 30A and a lower outer periphery on the outer periphery of the common device 39. By sealing the gap with the inner wall surface of the RPV 11 with the seal 30B, water filling can be performed upward from the seal surface. In this construction method, in the operation of cutting and dismantling the internal structure of the reactor mainly taking out the fuel debris 28, the work is carried out in a state where water is filled above the common device 39 and the shielding water depth is secured. The purpose is to reduce the rate and prevent the diffusion of dust generated during cutting and dismantling. In that case, the various nozzles 41A-41G mentioned above exist in each height level of the inner wall surface of RPV11, and water filling is inhibited. Therefore, while the reactor internals are sequentially taken out from above by the debris take-out device 58, the common device 39 is lowered, and the nozzle at the corresponding height level is closed by the plug by the plug mounting device 38 and water injection is repeated.

  FIG. 3 shows an example of the work flow.

  In the work flow of this embodiment shown in the figure, the shared device 39 is first suspended in the RPV 11 (step 59A) and installed near the main steam nozzle 41C. After the plug is attached to the main steam nozzle 41C by the plug attachment device 38 (step 59B), it moves downward and the plug is similarly attached to the emergency condenser nozzle 41D (step 59B). Next, the shared device 39 is lowered (step 59C), and water is poured from the upper outer peripheral seal 30A of the shared device 39 at an appropriate position, and water filling is performed (step 59D). The plug attachment device 38 is replaced with the debris removal device 58 (step 59E), the water supply sparger 55 and the CS pipe 56, which are neighboring structures, are cut and disassembled and removed (step 59F), and then replaced with the plug attachment device 38 again. (Step 59G), the water supply nozzle 41F and the CS nozzle 41G are closed with plugs (Step 59H). Next, the debris take-out device 58 is replaced again (step 59I), the common device 39 is lowered (step 59J), and the upper lattice plate 18 is taken out (cut and disassembled) (step 59K). Thereafter, the same nozzle plug closing, water injection, and debris retrieval including the structure are sequentially repeated.

  FIG. 4 shows a state diagram of the removal of the upper lattice plate 18.

  As shown in the figure, the common device 39 installed in the RPV 11 is filled with water by pouring water upward from the upper outer peripheral seal 30A. The outer peripheral seals are provided at two locations, the upper outer peripheral seal 30A and the lower outer peripheral seal 30B. This is because the common device 39 is lowered in a water-filled state on the inner wall surface of the RPV 11 in accordance with the progress of the debris extraction. In order to prevent a sudden drop in water level due to the leakage of water, a double seal structure is adopted. A debris retrieval device 58 is disposed inside the shared device 39. The debris extraction device 58 has a cutting function such as an abrasive water jet or a fiber laser, and cuts and disassembles the upper lattice plate 18.

  Next, the plug mounting apparatus and its procedure will be described with reference to FIGS.

  FIG. 5 shows a state in which the shared device 39 in which the plug attachment device 38 is installed is inserted into the RPV 11, and FIG. 6 shows details of the plug attachment device 38. In this embodiment shown in the figure, the plug 45 is prepared for a plurality of nozzles at the same height level in the plug mounting device 38, and the nozzle portion of the target portion is set by one set of the plug mounting device 38. For example, all the water supply nozzles 41F (four on the circumference) are closed (closed).

  As shown in FIG. 5, the shared device 39 in which the plug mounting device 38 is installed is lowered and inserted into the RPV 11 having the plurality of nozzle portions 41 </ b> A- 41 </ b> G. At that time, the space between the shared device 39 and the inner wall of the RPV 11 is sealed by the upper outer peripheral seal 30A and the lower outer peripheral seal 30B. The common device 39 includes a main turning table 31 and a sub turning table 33, which are sealed to the plug mounting device 38 via a main turning table seal 32 and a sub turning table seal 34, respectively. The position where the plug 45 is installed is determined by operating the table 31 and the auxiliary turning table 33. Reference numeral 43 denotes a cable / hose feed mechanism.

  On the other hand, as shown in FIG. 6, the plug attachment device 38 is installed in a container 54, a plug box 46 storing a plurality of plugs 45 disposed in the container 54, and a lower part of the plug box 46. The plug take-out mechanism 47, the plug pressing mechanism 51 having the plug holding mechanism 50 at the tip, the turning mechanism 49 for changing the attitude of the plug holding mechanism 50 and the plug pressing mechanism 51, the plug holding mechanism 50, and the plug pressing mechanism 51 are rotated. The rotating mechanism 48 is configured to include a plug holding mechanism 50 and a lifting device 52 that lifts and lowers the plug pressing mechanism 51.

  Then, the plug 45 is prevented from dropping by the plug take-out mechanism 47 installed at the lower part of the plug box 46, and the plug pressing mechanism 51 is inserted into the plug box 46, and the plug 45 is grasped by the plug gripping mechanism 50, The fall prevention of the plug take-out mechanism 47 is released. As will be described in detail later, after the plug 45 is taken out from the plug box 46, the plug 45 is lowered by the elevating device 52 of the plug mounting device 38 to carry out the plug 45 into the RPV 11, and the plug 45 carried into the RPV 11 is discharged. Is pushed into the nozzle portions 41A-41G using the turning mechanism 49 and the rotation mechanism 48. The plug 45 whose posture has been changed is inserted into the nozzle portion 41A-41G using the plug pressing mechanism 51, and the nozzle portion 41A-41G is closed.

  Next, steps related to the plug mounting operation in the first embodiment of the water pressure filling method in a reactor pressure vessel in the nuclear power plant of the present invention will be described with reference to FIGS.

  The reactor pressure vessel water filling method in the nuclear power plant of the present embodiment shown in the figure is not particularly shown, but structures (shield plug 9, upper lids 5 and 10, steam dryer 13) provided above the core 12. , The steam separator 14, the upper grid plate 18, the core shroud 15, etc.), and the common device 39 on which the plug mounting device 38 or the debris removal device 58 can be installed is transported to the plug mounting location in the RPV 11. A step (see FIG. 7) for sealing between the common device 39 and the inner wall of the RPV 11 with the upper outer peripheral seal 30A and the lower outer peripheral seal 30B (see FIG. 7), and a step for carrying the plug mounting device 38 into the common device 39 (see FIG. 8). , A step of inserting the plug attachment device 38 into the auxiliary turning table seal 34 (see FIG. 9), and a step of opening the shielding port 35. (See FIG. 10), a step (see FIG. 11) of seating the plug attachment device 38 carried into the common device 39 on the auxiliary turning table 33 of the common device 39, and a plug attachment device 38 seated on the auxiliary turning table 33. Turning the main turning table 31 to position the plug mounting device 38 (see FIG. 12), turning the auxiliary turning table 33 to position the plug mounting device 38 (see FIG. 13), A step of receiving one plug 45 in the plug box 46 by the plug gripping mechanism 50 of the plug mounting device 38 positioned by turning the turning table 31 and the auxiliary turning table 33 (see FIG. 14); The step of carrying the plug 45 into the RPV 11 by the lifting device 52 (see FIG. 15) and the plug 4 received by the plug gripping mechanism 50 Is changed to a position equivalent to the recirculation outlet nozzle 41A by the swiveling mechanism 49 of the plug mounting device 38 (see FIG. 16), and the plug 45 whose posture has been changed is re-used using the rotating mechanism 48 of the plug mounting device 38. The step of turning 180 ° to change the direction in the direction of the circulation outlet nozzle 41A (see FIG. 17), and the plug 45 having the direction changed in the direction of the recirculation outlet nozzle 41A is used by the plug pressing mechanism 51 of the plug mounting device 38. And pressing the recirculation outlet nozzle 41A to block the recirculation outlet nozzle 41A (see FIG. 18). The other nozzle portions 41B-41G can also close the nozzles in the same procedure as the above step.

  The plug mounting device 38 is carried out as follows. That is, the gripping of the plug 45 by the plug gripping mechanism 50 is released, and the plug gripping mechanism 50, the turning mechanism 49, the rotating mechanism 48, and the plug pressing mechanism 51 of the plug mounting device 38 are returned into the plug mounting device 38 (see FIG. 19). Thereafter, the plug mounting device 38 is raised (see FIG. 20) using the lifting device 52 of the plug mounting device 38 (see FIG. 20), the shielding port 35 is closed (see FIG. 21), and the common device 39 to the plug mounting device 38 are closed. Is carried out (see FIG. 22).

  When the plug mounting device 38 is carried out, it is replaced with a debris take-out device 58 for taking out the debris in the RPV 11 which is the next operation, and then water is filled above the common device 39 so that the fuel debris 28 by the debris take-out device 58 is filled. Is taken out.

  By adopting the water filling method in the reactor pressure vessel in the nuclear power plant of this embodiment, when performing various operations such as taking out the fuel debris 28 from the RPV 11, water is stretched above the common device 39. Therefore, it is possible to improve the working environment of the operator by suppressing the influence on the surroundings by radiation on the operation floor 29, and to prevent the diffusion of dust generated by cutting and dismantling, etc. Further, the shielding body in the reactor building 4 can be reduced, and the load applied to the reactor building 4 can be reduced.

  FIG. 23-35 shows a second embodiment of the plug installation work of the water pressure filling method in the reactor pressure vessel in the nuclear power plant of the present invention. FIG. 23 shows a state in which the common device 39 in which the plug attachment device 38A is installed is inserted into the RPV 11, and FIG. 24 shows the details of the plug attachment device 38A, with the plug attachment of the reactor pressure vessel water filling method in a nuclear power plant. The steps of Working Example 2 are shown in FIGS. 25 to 35, respectively. In the present embodiment shown in the figure, the number of nozzle portions for installing the plug 45 at one time is one, and the plug mounting device 38A is replaced each time.

  As shown in FIG. 23, the shared device 39 in which the plug mounting device 38A is installed is lowered and inserted into the RPV 11 having the plurality of nozzle portions 41A-41G described above. At that time, the space between the shared device 39 and the inner wall of the RPV 11 is sealed by the upper outer peripheral seal 30A and the lower outer peripheral seal 30B. The common device 39 includes a main turning table 31 and a sub turning table 33, which are sealed to the plug mounting device 38A via a main turning table seal 32 and a sub turning table seal 34, respectively. The position where the plug 45 is installed is determined by operating the table 31 and the auxiliary turning table 33. Reference numeral 43 denotes a cable / hose feed mechanism.

  On the other hand, as shown in FIG. 24, the plug attachment device 38A is schematically configured from a container 54 and a plug pressing mechanism 51 having a plug gripping mechanism 50 for gripping one plug 45 disposed in the container 54 at the tip. Has been.

  Then, the main turning table 31 and the sub turning table 33 are operated, the position where the plug 45 is installed is determined, the plug 45 is inserted into each nozzle part 41A-41G using the plug pressing mechanism 51, and each nozzle part 41A- 41G is blocked.

  Next, the steps of the plug mounting work in the second embodiment of the water pressure filling method in the reactor pressure vessel in the nuclear power plant of the present invention will be described with reference to FIGS.

  The reactor pressure vessel water filling method in the nuclear power plant of the present embodiment shown in the figure is not particularly shown, but structures (shield plug 9, upper lids 5 and 10, steam dryer 13) provided above the core 12. , A steam separator 14, an upper lattice plate 18, a core shroud 15, etc.) and a common device 39 on which a plug mounting device 38 A or a debris extraction device (not shown) can be installed up to the plug mounting location in the RPV 11. A step (see FIG. 25) of carrying in and sealing between the two (the common device 39 and the inner wall of the RPV 11) with the upper outer peripheral seal 30A and the lower outer peripheral seal 30B (see FIG. 25), and one plug 45 with the plug gripping mechanism 50 of the plug mounting device 38A A step (see FIG. 26) for carrying the grasped plug attachment device 38A into the common device 39, and the auxiliary attachment of the plug attachment device 38A. The step of inserting into the table seal 34 (see FIG. 27), the step of opening the shielding port 35 (see FIG. 28), and the plug mounting device 38A carried into the shared device 39 are connected to the auxiliary turning table of the shared device 39. A step (see FIG. 29) for seating on 33, a step (see FIG. 30) for positioning the plug mounting device 38A by turning the plug mounting device 38A seated on the auxiliary turning table 33 on the main turning table 31. This step comprises the step of pressing and closing one plug 45 held by the plug holding mechanism 50 against the recirculation outlet nozzle 41A using the plug pressing mechanism 51 of the plug mounting device 38A (see FIG. 31). Then, the plug mounting device 38A is replaced with the next plug mounting device 38A, and the plug mounting device 38A is pressed against the recirculation inlet nozzle 41B using the plug pressing mechanism 51 of the replaced plug mounting device 38A. The remaining nozzles on the same circumference repeat the same procedure as this procedure, and water is placed above the shared device 39.

  The plug attachment device 38A is unloaded after one recirculation outlet nozzle 41A is plugged with the plug 45 (the same applies after the other nozzle portions 41B-41G are plugged with the plug 45). That is, after plugging the recirculation outlet nozzle 41A with a single plug 45, the plug 45 is released from the plug holding mechanism 50, and the plug holding mechanism 50 and the plug pressing mechanism 51 of the plug mounting device 38A are placed in the plug mounting device 38A. Then, the plug mounting device 38A is raised (see FIG. 33) by using the lifting mechanism 42 of the common device 39, and the shielding port 35 is closed (see FIG. 34). The attachment device 38A is carried out (see FIG. 35). After this is repeated for the number of nozzles, it is replaced with a debris take-out device, and then water is filled above the shared device 39, and the fuel debris 28 is taken out by the debris take-out device 58.

  By adopting the water filling method in the reactor pressure vessel in the nuclear power plant of this embodiment, the same effect as that of Embodiment 1 can be obtained.

  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 (PCV), 4 ... Reactor building, 5, 10 ... Upper lid, 6 ... Dry well, 7 ... Pressure suppression chamber, 8 ... Vent passage , 9 ... Shield plug, 11 ... Reactor pressure vessel (RPV), 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 ... Gamma ray shield, 26 ... Dryer separator pool (DSP) ), 27 ... spent fuel storage pool (SFP), 28 ... fuel debris, 29 ... operation floor, 30A ... upper outer periphery seal, 30B ... lower outer periphery seal, 31 ... main turning table, 32 ... main turning table seal 33 ... Sub-turn table, 34 ... Sub-turn table seal, 35 ... Shield port, 38, 38A ... Plug mounting device, 39 ... Shared device, 41A ... Recirculation outlet nozzle, 41B ... Recirculation inlet nozzle, 41C ... For main steam Nozzle, 41D ... Emergency condenser nozzle, 41E ... Measurement nozzle, 41F ... Water supply nozzle, 41G ... CS nozzle, 42 ... Elevating mechanism of common device, 43 ... Cable / hose feed mechanism, 45 ... Plug, 46 ... Plug box , 47 ... Plug extraction mechanism, 48 ... Rotation mechanism, 49 ... Swing mechanism, 50 ... Plug gripping mechanism, 51 ... Plug pressing mechanism, 52 ... Elevating device for plug mounting device, 54 ... Container, 55 ... Water supply sparger, 56 ... CS Piping, 57 ... jet pump, 58 ... debris removal device.

Claims (7)

A water pressure filling method in a reactor pressure vessel in a nuclear power plant,
A reactor pressure vessel in a nuclear power plant characterized in that at least a common device on which a plug mounting device or a debris extraction device can be installed is inserted into the reactor pressure vessel, the space between both is sealed, and water is filled above the common device. Inland water filling method. In the method of filling a reactor pressure vessel in a nuclear power plant according to claim 1,
When the height position of the nozzle in the reactor pressure vessel corresponds to the water filling position when the structure in the reactor pressure vessel is carried out, the nozzle portion of the reactor pressure vessel is previously set using a plug attachment device. A method for filling a reactor pressure vessel in a nuclear power plant, comprising plugging with a plug and then filling water above the shared device. In the method of filling a reactor pressure vessel in a nuclear power plant according to claim 1 or 2,
The water pressure filling method in the reactor pressure vessel includes a step of bringing the common device into a plug attachment location in the reactor pressure vessel and sealing between the two, and a step of carrying the plug attachment device into the common device; A step of pouring water into the shared device and filling it with water, and a step of taking out the structure in the reactor pressure vessel after filling with water, and repeating the steps in order to remove the structure in the reactor pressure vessel at the lower part of the core Water reactor construction method in a nuclear reactor pressure vessel in a nuclear power plant In the method of filling a reactor pressure vessel in a nuclear power plant according to any one of claims 1 to 3,
The water pressure filling method in the reactor pressure vessel includes a step of unloading the structure provided in the upper part of the core, and the common device in which the plug mounting device or the debris extraction device can be installed as a plug in the reactor pressure vessel. A step of carrying in to the attachment point and sealing between the two, a step of carrying in the plug attachment device into the common device, and the plug attachment device carried into the common device to the auxiliary turning table of the common device A step of seating, a step of positioning the plug attachment device by turning the plug attachment device seated on the auxiliary turning table on a main turning table, and receiving a plug by a plug grasping mechanism of the plug attachment device; The posture of the plug received by the mechanism is changed to a position equivalent to the nozzle by the turning mechanism of the plug mounting device. A step of changing the orientation of the plug whose posture has been changed in the direction of the nozzle portion using a rotation mechanism of the plug attachment device, and the direction of the plug changed in the direction of the nozzle portion of the plug attachment device A nuclear power plant comprising: a step of pressing against the nozzle portion using a plug pressing mechanism; and a step of filling water above the common device after the nozzle portion is closed with the plug. In-reactor pressure vessel water filling method. In the method of filling a reactor pressure vessel in a nuclear power plant according to claim 4,
After plugging the nozzle portion with the plug, the plug gripping mechanism releases the plug, and the plug gripping mechanism, the turning mechanism, the rotating mechanism, and the plug pressing mechanism of the plug mounting device are plug-attached. After returning to the inside of the apparatus, the plug mounting apparatus is lifted by using a lifting mechanism of the plug mounting apparatus, the plug mounting apparatus is taken out from the shared apparatus and replaced with the debris retrieval apparatus, and then the shared apparatus Water filling method in a reactor pressure vessel in a nuclear power plant characterized by filling water above In the method of filling a reactor pressure vessel in a nuclear power plant according to any one of claims 1 to 3,
The water pressure filling method in the reactor pressure vessel includes a step of unloading the structure provided in the upper part of the core, and the common device in which the plug mounting device or the debris extraction device can be installed as a plug in the reactor pressure vessel. A step of carrying in to a mounting location and sealing between the two, a step of carrying in the plug mounting device holding one plug by a plug gripping mechanism of the plug mounting device into the shared device, and the shared device A step of seating the plug mounting device carried into the sub-turning table of the shared device, and a step of turning the plug mounting device seated on the sub-turning table on the main turning table to position the plug mounting device. One plug held by the plug holding mechanism positioned and the plug of the plug mounting device A step of pressing and closing the nozzle portion using an attaching mechanism, a step of replacing the plug attaching device with the next plug attaching device, and a step of pushing and closing the nozzle portion using the plug pushing mechanism of the replaced plug attaching device. Water filling in a nuclear reactor pressure vessel in a nuclear power plant, comprising: repeatedly performing as many as the number of nozzle portions; and filling all the nozzle portions with the plug and then filling water above the shared device. Construction method. In the method of filling a reactor pressure vessel in a nuclear power plant according to claim 6,
After closing the nozzle portion with one of the plugs, releasing the plug by the plug gripping mechanism, and returning the plug gripping mechanism and the plug pressing mechanism of the plug mounting device into the plug mounting device; The plug mounting device is lifted by using the lifting mechanism of the shared device to carry out the plug mounting device from the shared device, and after repeating this by the number of the nozzle portions, the debris removing device is replaced. Water filling method in a nuclear reactor pressure vessel in a nuclear power plant, wherein water is filled above the common device.

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