WO2013114548A1 - 原子炉容器蓋のwjp施工方法および治具 - Google Patents
原子炉容器蓋のwjp施工方法および治具 Download PDFInfo
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- WO2013114548A1 WO2013114548A1 PCT/JP2012/052042 JP2012052042W WO2013114548A1 WO 2013114548 A1 WO2013114548 A1 WO 2013114548A1 JP 2012052042 W JP2012052042 W JP 2012052042W WO 2013114548 A1 WO2013114548 A1 WO 2013114548A1
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- WIPO (PCT)
- Prior art keywords
- reactor vessel
- vessel lid
- wjp
- water
- jig
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/02—Details
- G21C13/06—Sealing-plugs
- G21C13/073—Closures for reactor-vessels, e.g. rotatable
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/20—Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/20—Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel
- G21C19/207—Assembling, maintenance or repair of reactor components
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C21/00—Apparatus or processes specially adapted to the manufacture of reactors or parts thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Definitions
- the present invention relates to a WJP application method and jig for a reactor vessel lid, and more particularly to a WJP application method and jig for a reactor vessel lid capable of realizing WJP application on the inner surface of a reactor vessel lid.
- the inner surface of the reactor vessel lid is in primary cooling water when the reactor is in operation. For this reason, there is a demand for performing WJP construction for suppressing the primary water stress corrosion cracking of the weld on the inner surface of the reactor vessel lid as maintenance.
- the WJP construction is performed by forming an underwater environment on the inner surface of the reactor vessel lid 112.
- the control rod drive device since the control rod drive device is installed on the upper part of the reactor vessel lid, it is necessary to prevent the water immersion to the control rod drive device at the time of WJP construction.
- JP 2000-218545 A Japanese Patent Application Laid-Open No. 10-213694
- An object of the present invention is to provide a WJP installation method and jig for a reactor vessel lid capable of realizing WJP installation on the inner surface of a reactor vessel lid.
- an underwater environment is formed on the inner surface of the reactor vessel lid and an airborne environment is formed on the outer surface of the reactor vessel lid.
- WJP construction is performed on the inner surface of the reactor vessel lid.
- the jig according to the present invention is characterized in that it has a cylindrical shape surrounding the outer surface side of the reactor vessel lid, and constitutes a vessel whose bottom is the reactor vessel lid.
- the jig according to the present invention is characterized in that the reactor vessel lid and the WJP device are supported in a mutually positioned state.
- the jig according to the present invention is characterized by including a water chamber communicating with the reactor vessel lid and capable of accommodating the WJP device, and supporting the reactor vessel lid and the WJP device in a mutually positioned state. I assume.
- the WJP construction method of the reactor vessel lid can be properly performed on the inner surface of the reactor vessel lid by forming the underwater environment on the inner surface of the reactor vessel lid.
- the formation of an atmospheric environment on the outer surface of the reactor vessel lid prevents water flooding to a device (for example, a control rod drive device) on the outer surface side of the reactor vessel lid.
- FIG. 1 is a flow chart showing a WJP application method of a reactor vessel lid according to an embodiment of the present invention.
- FIG. 2 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 3 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 4 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 5 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 6 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 7 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG. FIG.
- FIG. 8 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 9 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 10 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 11 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 12 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 13 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 14 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG. FIG.
- FIG. 15 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 16 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 17 is a flow chart showing a modified example 1 of the WJP application method of the reactor vessel lid described in FIG.
- FIG. 18 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 19 is a flow chart showing a second modification of the WJP application method of the reactor vessel lid described in FIG. 1.
- FIG. 20 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG. FIG.
- FIG. 21 is an explanatory view showing a modified example 3 of the WJP application method of the reactor vessel lid described in FIG. 1;
- FIG. 22 is an explanatory view showing a modified example 4 of the WJP application method of the reactor vessel lid described in FIG. 1;
- FIG. 23 is a flow chart showing a fifth modification of the WJP application method of the reactor vessel lid described in FIG. 1.
- FIG. 24 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 25 is an explanatory view showing a WJP application method of the reactor vessel lid described in FIG.
- FIG. 1 is a flow chart showing a WJP application method of a reactor vessel lid according to an embodiment of the present invention.
- 2 to 13 are explanatory views showing a WJP method of the reactor vessel lid described in FIG. These figures schematically show the WJP application method of the reactor vessel lid.
- the WJP application method of the reactor vessel lid is a method of applying WJP (Water Jet Peening) to the inner surface of the reactor vessel lid (in particular, the nozzle welding portion of the control rod drive mechanism housing), for example, Applies to pressurized water reactors.
- WJP Water Jet Peening
- the nuclear reactor 10 includes a nuclear reactor vessel 11, a core structure 12, and a control rod driving device 13.
- the nuclear reactor vessel 11 includes a nuclear reactor vessel body 111 and a reactor vessel lid 112.
- the reactor vessel body 111 is a cylindrical vessel having a spherical bottom and is embedded in the cavity 20 of the nuclear power plant.
- the reactor vessel lid 112 is a lid that covers the upper opening of the reactor vessel body 111, and is fastened and fixed to the reactor vessel body 111 via the guide stud bolt 113 and the stud bolt (not shown).
- the core structure 12 is composed of an upper core structure 121 composed of a fuel assembly, control rods and the like, and a lower core structure 122, and is accommodated in the reactor vessel 11.
- the control rod drive device 13 is a device for driving the control rod, and is disposed above the reactor vessel 11, and a control rod drive shaft (not shown) is inserted into the reactor vessel main body 111 from the reactor vessel lid 112. It is inserted and connected to the core structure 12.
- the reactor vessel lid 112 has a control rod drive mechanism housing 114 for inserting the control rod drive shaft of the control rod drive device 13.
- the control rod drive mechanism housing 114 is welded to the reactor vessel lid 112.
- Inconel 600 alloy is used for the nozzle welding portion of the control rod drive mechanism housing 114.
- the inner surface of the reactor vessel lid 112 is in the primary cooling water when the reactor 10 is in operation.
- WJP construction for suppressing the primary water stress corrosion cracking of the weld on the inner surface of the reactor vessel lid 112 is performed as maintenance.
- This WJP construction is performed by forming an underwater environment on the inner surface of the reactor vessel lid 112 as described later.
- the control rod drive 13 is installed above the reactor vessel lid 112 as described above, it is necessary to prevent the water in the control rod drive 13 during WJP construction.
- the underwater environment is formed on the inner surface of the reactor vessel lid 112 and the air environment is formed on the outer surface of the reactor vessel lid 112.
- WJP construction is performed on the inside. Specifically, WJP construction of the reactor vessel lid 112 is performed as follows (see FIGS. 1 to 16).
- step ST11 the existing guide stud bolt 113 is replaced with a shorter guide stud bolt 113 '(see FIG. 2).
- the existing guide stud bolt 113 is a bolt for connecting the flange portion of the reactor vessel main body 111 and the flange portion of the reactor vessel lid 112, and is screwed into a screw hole (not shown) of the flange portion of the reactor vessel main body 111. It is put together and installed.
- the guide stud bolt 113 has a long structure and guides the reactor vessel lid 112 when the reactor vessel lid 112 is attached to and detached from the reactor vessel main body 111.
- By replacing the guide stud bolt 113 with a shorter guide stud bolt 113 ' interference between the guide stud bolt 113' and other devices can be suppressed during WJP construction.
- the guide stud bolt 113 ′ closes the screw hole on the reactor vessel main body 111 side, water immersion to the screw hole at the time of WJP construction is suppressed.
- step ST12 the reactor vessel lid 112 and the control rod drive 13 are removed from the reactor vessel main body 111, lifted by a crane (not shown), and carried out of the cavity 20 (not shown).
- the reactor vessel lid 112 and the control rod driving device 13 carried out are temporarily placed on a dedicated stand installed on the floor outside the cavity 20, and the decontamination work is performed (not shown).
- this external floor is a permanent floor of a building, and is a floor different from the temporary floor 30 described later.
- the dedicated stand is an existing stand usually used at the time of inspection.
- an inspection operation of a connection portion between the reactor vessel lid 112 and the control rod driving device 13 is performed. Specifically, the funnel, the thermal sleeve, the support grid and the like are removed from the control rod drive mechanism housing 114 as needed, leaving only the connection with the reactor vessel lid 112. Further, with respect to the control rod drive mechanism housing 114 penetrating the reactor vessel lid 112, a visual inspection is performed on the welded portion. In addition, the normal inspection operation of the reactor vessel lid 112 and the control rod drive 13 is performed.
- the inner surface of the reactor vessel lid 112 and the nozzle of the control rod drive mechanism housing 114 are fixed by J-welding at the boundary portion as shown in FIG.
- the outer surface of the weld and the inner surface of the nozzle are subject to WJP.
- step ST13 the cavity 20 is filled with water, and the water level in the cavity 20 rises (see FIG. 3).
- water supply to the cavity 20 is performed according to the lifting operation of the reactor vessel lid 112 in step ST12, and the distance between the water surface in the cavity 20 and the bottom surface of the flange portion of the reactor vessel lid 112 becomes constant.
- the water level in the cavity 20 is adjusted.
- the upper core structure 121 is taken out of the reactor vessel main body 111.
- the upper core structure 121 thus taken out is placed on a stand 2 installed on the floor of the cavity 20.
- Lower core structure 122 is removed from reactor vessel main body 111 and placed in cavity 20 (not shown) as necessary.
- normal inspection work is performed on the reactor vessel main body 111, the upper core structure 121, the lower core structure 122, and the like.
- the temporary floor 30 and the temporary bridge 1 are installed on the top of the cavity 20 (see FIG. 4).
- the temporary floor 30 is a floor provided above the cavity 20 and serves as a temporary storage place for jigs and devices. Moreover, the temporary floor 30 has an opening part for letting a jig
- the temporary bridge 1 is a floor provided at the opening of the temporary floor 30, and serves as a work scaffolding or storage area.
- step ST15 the waterproof jig 3 is mounted on the reactor vessel lid 112 and the control rod drive 13 on the temporary floor 30 (see FIG. 5).
- the assembly of the reactor vessel lid 112, the control rod drive 13 and the waterproof jig 3 is referred to as an assembly X.
- the waterproof jig 3 is a jig for preventing the water in the control rod driving device 13 when the inner surface of the reactor vessel lid 112 is in the water environment.
- the waterproof jig 3 has a cylindrical shape extending to the outer surface side of the reactor vessel lid 112, and configures the vessel with the reactor vessel lid 112 as a bottom.
- the waterproof jig 3 has a divided structure in which cylindrical members 31 in a plurality of stages are connected in the axial direction. Further, the waterproof jig 3 has an inner diameter that can surround the control rod driving device 13, and is attached to the flange portion of the reactor vessel lid 112 at its lower end portion, and the vessel with the reactor vessel lid 112 at the bottom portion Configured.
- Each cylindrical member 31 is made of a rigid material that can withstand water pressure, and has an inner diameter corresponding to the outer diameter of the reactor vessel lid 112 and the outer diameter of the control rod driving device 13.
- the plate member 32 which is the lowermost step is installed on the temporary floor 30.
- the reactor vessel lid 112 and the control rod drive 13 are placed on the plate member 32, and the plate member 32 and the reactor vessel lid 112 are connected and fixed to each other (see FIG. 6).
- the plate-like member 32 and the flange portion of the reactor vessel lid 112 are bolted, whereby the gap between the plate-like member 32 and the reactor vessel lid 112 is sealed.
- a plug (not shown) is attached to a vent pipe (not shown) in the reactor vessel lid 112 or the upper end of the control rod drive 13, and the opening on the upper surface of the reactor vessel lid 112 is sealed. .
- the plurality of cylindrical members 31 are sequentially stacked and connected to the lowermost plate member 32 (see FIG. 7). At this time, the connection between the plate member 32 and the cylindrical member 31 and the connection between the adjacent cylindrical members 31 are sealed. As a result, a cylindrical container having the reactor vessel lid 112 at the bottom is formed, and the control rod drive 13 is accommodated in the cylindrical container.
- step ST16 the WJP device 4 is installed on the gantry 5 (see FIG. 8).
- the assembly of the WJP device 4 and the gantry 5 is referred to as an assembly Y. This assembly operation is performed on the temporary floor 30.
- the WJP device 4 is a device for performing WJP construction, and as shown in FIG. 13, has a nozzle 41, an arm 42, a moving rail 43, and a turntable 44 (not shown in FIG. 8).
- the nozzle 41 is a nozzle for injecting a water jet, and is disposed with the injection port directed upward.
- the arm 42 rotates around the axis, and by changing the nozzle 41 in the axial direction and the rotational direction, it is possible to change the orientation, height, inclination angle, etc. of the injection port of the nozzle 41.
- the moving rail 43 is a rail for slidingly displacing the arm 42 in the horizontal direction.
- the turntable 44 is a table for rotating and displacing the moving rail 43 on a horizontal surface.
- the gantry 5 is a structure that supports the reactor vessel lid 112 and the WJP device 4 in a positioned state, and as shown in FIG. 13, a frame-like pedestal 51 and a leg 52 that supports the pedestal 51 Have.
- the WJP device 4 is installed on the leg 52 of the gantry 5 (see FIGS. 8 and 13). At this time, the WJP device 4 is installed with the turn table 44 fixed to the leg 52 of the pedestal 51 while the nozzle 41 is directed upward. In addition, after the assembly Y is assembled, the operation test of the WJP device 4 is performed.
- step ST17 an assembly X consisting of the reactor vessel lid 112, the control rod drive 13 and the waterproof jig 3 is installed in an assembly Y consisting of the WJP device 4 and the gantry 5 (see FIGS. 9 and 10). .
- the assembly of the assembly X and the assembly Y is referred to as an assembly Z. This assembly work is performed on the temporary floor 30 (or temporary bridge 1) which is in the air.
- the assembly X is lifted by the crane 6 and installed on the pedestal 51 of the pedestal 5, and the assembly X (the plate member 32 of the waterproof jig 3) and the pedestal 51 are bolted. It is fixed.
- the reactor vessel lid 112 is disposed with its flange portion fixed to the upper surface of the pedestal 51 while the inner surface is directed downward (WJP device 4 side). Thereby, the WJP device 4 and the reactor vessel lid 112 are positioned and fixed.
- step ST18 the assembly Z of the reactor vessel lid 112, the control rod drive 13, the waterproof jig 3, the WJP device 4 and the gantry 5 is carried into the cavity 20 (see FIG. 11).
- the crane 6 is used to suspend the assembly Z from the temporary floor 30 into the cavity 20.
- a guide stud bolt 113 ' is used to place the assembly Z in place.
- the gantry 5 is disposed in the cavity 20 across the flange portion of the reactor vessel main body 111. Further, the WJP device 4 is disposed above the reactor vessel main body 111, and the reactor vessel lid 112 is disposed above the WJP device 4 with the inner surface side facing downward. At this time, the water level in the cavity 20, the height of the gantry 5 and the like are set so that the reactor vessel lid 112 is below the water surface of the cavity 20. Thus, the underwater environment is formed on the inner surface of the reactor vessel lid 112.
- the height (the height and the number of steps of the cylindrical member 31) of the waterproof jig 3 is set such that the upper portion of the waterproof jig 3 is above the water surface of the cavity 20.
- the space partitioned by the waterproof jig 3 and the reactor vessel lid 112 is in the air.
- An atmospheric environment is formed on the outer surface of the reactor vessel lid 112 to prevent the control rod drive 13 from being flooded.
- air may remain in the reactor vessel lid 112. This air can be discharged from, for example, a vent pipe (not shown) of the reactor vessel lid 112.
- the fixing jig 7 for holding the waterproof jig 3 is attached (refer FIG. 12).
- the fixing jig 7 is fixed to the temporary bridge 1 side and supports the waterproof jig 3 from the circumferential direction.
- the assembly Z is supported from the circumferential direction and stabilized.
- step ST19 WJP construction is performed (see FIGS. 12 to 14).
- the WJP application is performed on the inner and outer surfaces (see FIG. 14) of the nozzle welds of the plurality of control rod drive mechanism housings 114 on the inner surface of the reactor vessel lid 112.
- the WJP device 4 rotates the turntable 44, slides the arm 42 and displacing the arm 42, and moves the nozzle 41, whereby WJP construction of each welding portion can be sequentially performed.
- the removal work after WJP construction is performed as follows, for example (illustration omitted).
- the assembly Z is lifted by the crane 6 and carried out of the cavity 20 onto the temporary floor 30.
- the waterproof jig 3, the WJP device 4 and the gantry 5 are removed from the reactor vessel lid 112 and the control rod driving device 13 in the reverse order of the steps of FIGS. 6 to 9.
- the reactor vessel lid 112 and the control rod drive 13 are temporarily placed on a stand installed on the floor outside the cavity 20.
- an inspection is performed on the part on which the WJP work has been performed.
- components such as funnels, thermal sleeves, support grids, etc. are reattached to the control rod drive housing 114.
- the temporary floor 30 is removed.
- the upper core structure 121 is returned to the reactor vessel body 111. Thereafter, the reactor vessel lid 112 and the control rod drive 13 are carried into the cavity 20 and attached to the reactor vessel main body 111 while lowering the water level of the cavity 20.
- the existing guide stat bolt 113 is replaced with a short guide stat bolt 113 '(step ST11), and then the short guide stat bolt 113' is installed. Each process is performed as it is.
- the guide stat bolt 113 'to be replaced may have a separation structure as shown in FIG.
- the guide stat bolt 113 'in FIG. 16 is composed of a plug portion 1131 and a guide portion 1132 (see FIG. 16A).
- the plug portion 1131 is a plug for closing a screw hole on the flange portion 1111 side of the nuclear reactor vessel main body 111 (a screw hole to which the existing guide stat bolt 113 is attached).
- the screw hole on the flange portion 1111 side of the nuclear reactor vessel main body 111 is closed and sealed by the plug portion 1131.
- the guide portion 1132 constitutes a main body of the guide stat bolt 113 ′ and has a structure that can be attached to and detached from the plug portion 1131.
- FIG. 17 and FIG. 18 are a flowchart and an explanatory view showing a first modification of the WJP application method of the reactor vessel lid described in FIG. In the first modification, the description of the flow common to the WJP method of the reactor vessel lid illustrated in FIG. 1 will be omitted.
- the assembly Z is integrated (step ST17) (see FIGS. 9 and 10), and the assembly Z is lifted by the crane 6 and carried into the underwater cavity 20 (step ST18) (see FIG. 11). ).
- the assembly Z is preassembled in air and carried into the cavity 20, which is preferable in that the reactor vessel lid 112 and the WJP device 4 can be accurately positioned.
- the assembly X and the assembly Y may be separately carried into the cavity 20 (see FIGS. 17 and 18).
- the assembly Y is carried into the underwater cavity 20 and disposed on the reactor vessel main body 111 (step ST27).
- the guide stud bolt 113 ' is used to place the assembly Y at a predetermined position.
- the assembly X is carried into the cavity 20 and attached to the underwater assembly Y to construct the assembly Z (step ST28) (see FIG. 18).
- WJP construction is performed (step ST29).
- the assembly X and the assembly Y are separately carried into the cavity 20, which is preferable in that the load on the crane 6 can be reduced.
- [Modification 2] 19 and 20 are a flowchart and an explanatory view showing a second modification of the WJP application method of the reactor vessel lid described in FIG. 1. The description of the flow common to the WJP application method of the reactor vessel lid described in FIG.
- the assembly X is installed on the gantry 5 in the cavity 20, and WJP construction is performed (see FIGS. 12 and 13).
- the assembly X may be suspended in the cavity 20 and WJP construction may be performed (see FIGS. 19 and 20). That is, the gantry 5 may be omitted.
- step ST36 For example, in the second modification shown in FIGS. 19 and 20, first, only the WJP device 4 is carried into the cavity 20 and arranged at a predetermined position (step ST36). At this time, the guide stud bolt 113 'is used to position the WJP device 4 at a predetermined position.
- the assembly X is suspended and held in the cavity 20 by the crane 6 (step ST37). In addition, the assembly X is held by the fixing jig 7 and the posture (height and direction) of the assembly X is fixed. And WJP construction is performed in this state (step ST38).
- Modifications 3 and 4] 21 and 22 are explanatory views showing modified examples 3 and 4 of the WJP application method of the reactor vessel lid described in FIG. 1.
- the description of the flow common to the WJP method of the reactor vessel lid described in FIG. 1 will be omitted.
- the assembly Z is disposed above the reactor vessel main body 111 and the WJP operation is performed (see FIG. 12).
- the use of the guide stud bolt 113 ' is preferable in that the assembly Z can be stably moved up and down in the cavity 20 which is underwater.
- the assembly Z may be disposed in the cavity 20 and at a position away from the reactor vessel main body 111 to perform the WJP.
- This configuration is preferable in that WJP can be performed regardless of the presence or absence of the upper core structure 121 in FIG. 1 (step ST13).
- the assembly X is suspended in the cavity 20 and above the reactor vessel main body 111, and the WJP work is performed.
- the assembly X may be suspended at a position in the cavity 20 and away from the reactor vessel main body 111 to perform WJP. .
- [Modification 5] 23 to 25 are a flowchart and an explanatory view showing a fifth modification of the WJP application method of the reactor vessel lid described in FIG. These figures show the WJP construction method using a dedicated water tank 8. In the fifth modification, the description of the flow in common with the WJP installation method of the reactor vessel lid described in FIG. 1 will be omitted.
- the reactor vessel lid 112 immerses the inner surface side in the water of the cavity 20, thereby forming an underwater environment on the inner surface of the reactor vessel lid 112 (see FIG. 12).
- the reactor vessel lid 112 mounts the waterproof jig 3
- entry of water to the outer surface side of the reactor vessel lid 112 is prevented, and an air environment is formed on the outer surface of the reactor vessel lid 112. ing.
- the existing cavity 20 can be used to form the underwater environment of the inner surface of the reactor vessel lid 112 and the air environment of the outer surface, respectively. preferable.
- the present invention is not limited to this, and other jigs may be used under environments other than the cavity 20 to realize the underwater environment of the inner surface of the reactor vessel lid 112 and the air environment of the outer surface.
- a configuration may be employed in which a water chamber 81 communicating with the inner surface of the reactor vessel lid 112 is formed, and the outer surface of the reactor vessel lid 112 is disposed outside the water chamber 81 (see FIG. 25).
- the water chamber 81 is filled with water, and the outside of the water chamber 81 is in the air, whereby the underwater environment of the inner surface of the reactor vessel lid 112 and the air environment of the outer surface are respectively formed.
- a dedicated water tank 8 is installed on the temporary floor 30 (step ST43).
- the water tank 8 has a first water chamber 81 and a second water chamber 82.
- the first water chamber 81 is a water chamber having an opening at the ceiling, and the reactor vessel lid 112 can be attached to the opening.
- the second water chamber 82 is a water chamber that applies water pressure to the first water chamber 81, and has a wall surface higher than the opening of the ceiling of the first water chamber 81.
- the WJP device 4 is installed in the water tank 8, the WJP device 4 is installed. At this time, the nozzle 41 of the WJP device 4 is disposed so as to go through the opening of the ceiling of the first water chamber 81.
- the reactor vessel lid 112 is attached to the water tank 8 (step ST44). Specifically, the reactor vessel lid 112 is installed at the opening of the ceiling of the first water chamber 81 with the inner surface facing downward. In addition, the reactor vessel lid 112 is bolted to and fixed to the first water chamber 81 while sealing the gap between the reactor vessel lid 112 and the opening of the first water chamber 81.
- step ST45 water is supplied to the water tank 8, and the first water chamber 81 is filled with water (step ST45).
- the water level of the second water chamber 82 is set higher than that of the reactor vessel lid 112 in the first water chamber 81, whereby water pressure is applied to the first water chamber 81.
- the air in the reactor vessel lid 112 is discharged from, for example, a vent pipe (not shown) of the reactor vessel lid 112.
- the underwater environment is formed on the inner surface of the reactor vessel lid 112.
- the outer surface of the reactor vessel lid 112 is in the air outside the first water chamber 81, flooding of the control rod driving device 13 is prevented.
- the WJP device 4 is driven to perform WJP construction of each nozzle weld portion (step ST47).
- the reactor vessel lid 112 has a cylindrical shape extending to the outer surface side of the reactor vessel lid 112, and the vessel is constructed with the reactor vessel lid 112 as a bottom portion.
- the jig 3 is mounted and placed in water (see FIGS. 12 and 20 to 22).
- the tubular waterproof jig 3 is on the outer surface side of the reactor vessel lid 112 by enclosing the outer surface side of the reactor vessel lid 112. Flooding of the device (control rod drive 13) is prevented.
- This has the advantage that the underwater environment of the inner surface of the reactor vessel lid 112 and the air environment of the outer surface can be respectively formed.
- the reactor vessel lid 112 is disposed on the gantry 5 installed in the water (see FIGS. 13, 12 and 21). This has the advantage that the reactor vessel lid 112 is stably supported in water.
- the above-described gantry 5 is disposed above the reactor vessel main body 111 (see FIG. 12).
- the above-described gantry 5 is disposed above the reactor vessel main body 111 (see FIG. 12).
- the above-described gantry 5 may be disposed at a position away from the reactor vessel main body 111 (see FIG. 21).
- the WJP device 4 performing WJP construction, the reactor vessel lid 112, the waterproof jig 3 and the gantry 5 are assembled after being submerged in water. (Steps ST15 to ST18) (see FIGS. 1, 10 and 11). This has the advantage that the positioning accuracy between the reactor vessel lid 112 and the gantry 5 can be improved.
- the reactor vessel lid 112 is attached to the gantry 5 previously installed in water (steps ST25 to ST28) (see FIGS. 17 and 18).
- the reactor vessel lid 112 and the gantry 5 can be separately carried into the cavity 20, so that the load on the crane 6 can be reduced.
- the existing guide stud bolt 113 for guiding the reactor vessel lid 112 is replaced with a shorter guide stud bolt 113 '(step ST11) (FIG. 1 and FIG. 1) See Figure 3).
- the reactor vessel lid 112 is suspended and arranged in water (see FIGS. 20 and 22). In this configuration, there is an advantage that the installation of the gantry 5 is unnecessary.
- a water chamber (first water chamber 81) communicating with the inner surface of the reactor vessel lid 112 is formed, and the outer surface of the reactor vessel lid 112 is the outside of the water chamber 81. (See FIGS. 24 and 25).
- This has the advantage that the underwater environment of the inner surface of the reactor vessel lid 112 and the air environment of the outer surface can be respectively formed.
- this jig (the waterproof jig 3) has a cylindrical shape surrounding the outer surface side of the reactor vessel lid 112 and constitutes a vessel having the reactor vessel lid 112 at the bottom (see FIG. 7).
- the jig (the waterproof jig 3) is formed by axially connecting a plurality of cylindrical members 31 (see FIG. 7). With such a configuration, there is an advantage that the waterproof jig 3 can be easily attached to the reactor vessel lid 112 by sequentially connecting the plurality of cylindrical members 31.
- the jig (guide stud bolt 113 ′) has a plug portion 1131 attachable to the screw hole of the nuclear reactor vessel main body 111 and a guide portion 1132 removable from the plug portion 1131 (FIG. 16). reference).
- the jig (the gantry 5) supports the reactor vessel lid 112 and the WJP device 4 in a mutually positioned state (see FIG. 8). Thereby, there is an advantage that the WJP application to the reactor vessel lid 112 can be performed with high accuracy.
- the jig (water tank 8) includes a water chamber (first water chamber 81) which communicates with the reactor vessel lid 112 and can accommodate the WJP device 4 (see FIG. 25).
- the water tank 8 supports the reactor vessel lid 112 and the WJP device 4 in a mutually positioned state.
- the underwater environment of the inner surface of the reactor vessel lid 112 and the air environment of the outer surface can be respectively formed.
- the reactor vessel lid 112 and the WJP device 4 are supported in a mutually positioned state, there is an advantage that the WJP application to the reactor vessel lid 112 can be performed with high accuracy.
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Abstract
Description
図1は、この発明の実施の形態にかかる原子炉容器蓋のWJP施工方法を示すフローチャートである。図2~図13は、図1に記載した原子炉容器蓋のWJP施工方法を示す説明図である。これらの図は、原子炉容器蓋のWJP施工方法について、模式的に示している。
図17および図18は、図1に記載した原子炉容器蓋のWJP施工方法の変形例1を示すフローチャートおよび説明図である。この変形例1において、図1に記載した原子炉容器蓋のWJP施工方法と共通のフローについては、その説明を省略する。
図19および図20は、図1に記載した原子炉容器蓋のWJP施工方法の変形例2を示すフローチャートおよび説明図である。これらの変形例2において、図1に記載した原子炉容器蓋のWJP施工方法と共通のフローについては、その説明を省略する。
図21および図22は、図1に記載した原子炉容器蓋のWJP施工方法の変形例3、4を示す説明図である。これらの変形例3、4において、図1に記載した原子炉容器蓋のWJP施工方法と共通のフローについては、その説明を省略する。
図23~図25は、図1に記載した原子炉容器蓋のWJP施工方法の変形例5を示すフローチャートおよび説明図である。これらの図は、専用の水槽8を用いたWJP施工方法を示している。この変形例5において、図1に記載した原子炉容器蓋のWJP施工方法と共通のフローについては、その説明を省略する。
以上説明したように、この原子炉容器蓋112のWJP施工方法では、原子炉容器蓋112の内面に水中環境が形成され、原子炉容器蓋112の外面に気中環境が形成されて、原子炉容器蓋112の内面にWJP施工が行われる(図12、図20~図22および図24参照)。
Claims (15)
- 原子炉容器蓋の内面に水中環境が形成されると共に、前記原子炉容器蓋の外面に気中環境が形成されて、前記原子炉容器蓋の内面にWJP施工が行われることを特徴とする原子炉容器蓋のWJP施工方法。
- 前記原子炉容器蓋が、前記原子炉容器蓋の外面側に延びる筒状形状を有すると共に原子炉容器蓋を底部として容器を構成する防水治具を装着して、水中に配置される請求項1に記載の原子炉容器蓋のWJP施工方法。
- 前記原子炉容器蓋が、水中に設置された架台上に配置される請求項2に記載の原子炉容器蓋のWJP施工方法。
- 前記架台が、原子炉容器本体の上方に配置される請求項3に記載の原子炉容器蓋のWJP施工方法。
- 前記架台が、原子炉容器本体から外れた位置に配置される請求項3に記載の原子炉容器蓋のWJP施工方法。
- 前記WJP施工を行うWJP装置と、前記原子炉容器蓋と、前記防水治具と、前記架台とが、気中にて組み立てられた後に水中に配置される請求項3~5のいずれか一つに記載の原子炉容器蓋のWJP施工方法。
- 前記原子炉容器蓋が、水中に予め設置された前記架台に対して取り付けられる請求項3~6のいずれか一つに記載の原子炉容器蓋のWJP施工方法。
- 前記原子炉容器蓋をガイドする既存のガイドスタッドボルトが、より短尺なガイドスタッドボルトに交換される請求項1~7のいずれか一つに記載の原子炉容器蓋のWJP施工方法。
- 前記原子炉容器蓋が、水中に吊り下げられて配置される請求項2に記載の原子炉容器蓋のWJP施工方法。
- 前記原子炉容器蓋の内面に連通する水室が形成されると共に、前記原子炉容器蓋の外面が前記水室の外部にある気中に配置される請求項1に記載の原子炉容器蓋のWJP施工方法。
- 原子炉容器蓋の外面側を囲む筒状形状を有すると共に前記原子炉容器蓋を底部とした容器を構成することを特徴とする治具。
- 複数の筒状部材を軸方向に連結して成る請求項12に記載の治具。
- 原子炉容器本体のネジ穴に装着可能なプラグ部と、前記プラグ部に対して着脱可能なガイド部とを有することを特徴とする治具。
- 原子炉容器蓋とWJP装置とを相互に位置決めした状態で支持することを特徴とする治具。
- 原子炉容器蓋に連通すると共にWJP装置を収容できる水室を備え、且つ、原子炉容器蓋とWJP装置とを相互に位置決めした状態で支持することを特徴とする治具。
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JP2013556107A JP5852143B2 (ja) | 2012-01-30 | 2012-01-30 | 原子炉容器蓋のwjp施工方法および治具 |
US14/374,183 US9789585B2 (en) | 2012-01-30 | 2012-01-30 | WJP execution method for reactor vessel lid and jigs |
EP12867409.0A EP2811487B1 (en) | 2012-01-30 | 2012-01-30 | Wjp execution method for reactor vessel lid, and jig |
PCT/JP2012/052042 WO2013114548A1 (ja) | 2012-01-30 | 2012-01-30 | 原子炉容器蓋のwjp施工方法および治具 |
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EP (1) | EP2811487B1 (ja) |
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US20150239065A1 (en) * | 2014-02-20 | 2015-08-27 | Kabushiki Kaisha Toshiba | Laser processing apparatus and laser processing method |
CN115083639A (zh) * | 2022-06-28 | 2022-09-20 | 上海核工程研究设计院有限公司 | 一种可切换高度的核电厂压力容器导向栓装置及吊装方法 |
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US9180557B1 (en) * | 2014-04-21 | 2015-11-10 | Areva Inc. | Two-piece replacement nozzle |
DE102015215820A1 (de) * | 2015-08-19 | 2017-02-23 | Siemens Healthcare Gmbh | Steuern eines medizintechnischen Geräts |
GB2593258A (en) * | 2020-12-03 | 2021-09-22 | Rolls Royce Plc | Nuclear power generation system |
GB2611878A (en) * | 2022-09-14 | 2023-04-19 | Rolls Royce Smr Ltd | Closure head mounting fixture |
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CN115083639A (zh) * | 2022-06-28 | 2022-09-20 | 上海核工程研究设计院有限公司 | 一种可切换高度的核电厂压力容器导向栓装置及吊装方法 |
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EP2811487A1 (en) | 2014-12-10 |
JPWO2013114548A1 (ja) | 2015-05-11 |
EP2811487B1 (en) | 2017-08-02 |
JP5852143B2 (ja) | 2016-02-03 |
US9789585B2 (en) | 2017-10-17 |
EP2811487A4 (en) | 2015-09-30 |
US20150013414A1 (en) | 2015-01-15 |
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