JP2015033760A - Water jet peening device and water jet peening method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water jet peening device which can further shorten a time required for water jet peening.SOLUTION: A water jet peening device (WJP device) 1 has a seating member 2, and a slewing part 3 and injection nozzles 19, 20 which are attached to the seating member. A lifting device 12 is attached to the slewing part 3, and the injection nozzles 19, 20 are attached to a nozzle arm 16. The WJP device 1 is hung by a crane and is lowered in a reactor pressure vessel (RPV) 31, and the seating member 2 is seated on an in-pile instrumentation cylinder 32 which is welded to a bottom of the RPV 31. The nozzle arm 16 is lowered by the lifting device 12, and thereby the injection nozzles 19, 20 are lowered. The injection nozzle 19 is inserted into the in-pile instrumentation cylinder 32, and the injection nozzle 20 is disposed outside the in-pile instrumentation cylinder 32. High pressure water are injected from the injection nozzles 19, 20, and the WJP is installed on each of the inside surface and the outside surface of the in-pile instrumentation cylinder 32.

Description

  The present invention relates to a water jet peening apparatus and a water jet peening method, and more particularly to a water jet peening apparatus and a water jet peening method suitable for application to a tubular body of a nuclear power plant.

  When residual stress exists near the surface of the welded part and heat-affected zone of a structural member of a nuclear power plant, water jet peening (hereinafter referred to as WJP) is applied to the welded part and its heat-affected zone. Thus, the tensile residual stress existing in the vicinity of the surface of the structural member (WJP construction object) is improved to the compressive residual stress. WJP is performed by injecting a high-pressure water flow from an injection nozzle in water in a state where a structural member for improving residual stress is immersed in water. Shock waves are generated by the collapse of cavitation bubbles contained in the jetted high-pressure water flow. When this shock wave collides with the surface of the structural member in water, the tensile residual stress near the surface of the structural member is improved to the compressive residual stress. For this reason, generation | occurrence | production of the stress corrosion crack (SCC) in a structural member is suppressed. A stress improvement method using WJP is described in, for example, Japanese Patent Application Laid-Open No. 7-270590.

  In the stress improvement method described in Japanese Patent Application Laid-Open No. 7-270590, a water jet peening apparatus (hereinafter referred to as a WJP apparatus) is provided with a control rod drive mechanism housing that is attached to the bottom of the reactor pressure vessel through the bottom. The high pressure water stream is jetted from the jet nozzle of the WJP device toward the welded portion of the control rod drive mechanism housing and the reactor pressure vessel. The shock wave generated by the collapse of the cavitation bubbles contained in the high-pressure water flow collides with the surface of the welded portion, whereby the residual stress on the surface of the welded portion is improved. Japanese Patent Laid-Open No. 7-270590 discloses WJP to a neutron measuring instrument housing (tubular body) adjacent to a control rod drive mechanism housing using a WJP apparatus seated on the upper end of the control rod drive mechanism housing. Implementation is also described.

  Japanese Unexamined Patent Publication No. 2000-308927 also describes performing WJP on a neutron measuring instrument housing. In Japanese Patent Application Laid-Open No. 2000-308927, one jet adjacent to these control rod drive mechanism housings by jets ejected from the respective jet nozzles of two WJP devices seated on the two control rod drive mechanism housings. WJP is being implemented for neutron measuring instrument housings.

  In the WJP method described in Japanese Patent Laid-Open No. 7-328858, an injection nozzle is inserted into a tubular body, a jet including cavitation bubbles is injected from the injection nozzle toward the inner surface of the welded portion of the tubular body, and the cavitation bubbles collapse WJP is performed on the inner surface of the welded portion using the shock wave generated by the above. As a result, the residual stress on the inner surface of the weld is improved to compressive residual stress. Also in Japanese Patent Laid-Open No. 10-76467, an injection nozzle is inserted into a hollow tube (tubular body), and WJP is applied to the inner surface of the hollow tube by the collapse of cavitation bubbles contained in the jet flow injected from the injection nozzle. Is implemented.

JP 7-270590 A JP 2000-308927 A JP 7-328858 A Japanese Patent Laid-Open No. 10-76467

  The WJP devices described in JP-A-7-270590 and JP-A-2000-308927 can apply WJP to the outer surface of a tubular body. Moreover, each WJP apparatus described in Unexamined-Japanese-Patent No. 7-328858 and Unexamined-Japanese-Patent No. 10-76467 can construct WJP with respect to the inner surface of a tubular body.

  However, when WJP is applied to each of the inner and outer surfaces of the tubular body, the outer surface WJP apparatus described in Japanese Patent Laid-Open Nos. 7-270590 and 2000-308927 is used. WJP is applied to the outer surface, and then WJP is applied to the inner surface of the tubular body using the WJP device for the inner surface described in JP-A-7-328858 and JP-A-10-76467. Or conversely, it is conceivable that WJP is applied to the inner surface of the tubular body using the latter WJP device, and then WJP is applied to the inner surface of the tubular body using the former WJP device.

  However, in the construction of WJP on the inner and outer surfaces of the tubular body as described above, it is necessary to replace the WJP apparatus as described above, and it takes a long time for the WJP work. For this reason, it is desired to shorten the working time of WJP when constructing WJP on the inner and outer surfaces of the tubular body.

  An object of the present invention is to provide a water jet peening apparatus and a water jet peening method that can further reduce the time required for water jet peening.

  The features of the present invention that achieve the above-described object are: a seating member; a swiveling portion that is pivotally attached to the seating member and disposed above the seating member; A lifting device having a member, a first injection nozzle inserted into the tubular body when the seating member is seated on the tubular body, which is a water jet peening object, and the first lifting and lowering section; When the seating member is attached to the member and seated on the tubular body, the second injection nozzle is disposed outside the tubular body.

  Since the first injection nozzle and the second injection nozzle are attached to the elevating member, when the seating member is seated on the tubular body that is a water jet peening object, the elevating device is provided with the elevating device provided on the swivel unit. By moving the tubular body in the axial direction, the first spray nozzle can be easily inserted into the tubular body, and the second spray nozzle can be easily disposed outside the tubular body. Applying water jet peening to the inner and outer surfaces of the welded portion of the tubular body in a state where the seating member is seated on the tubular body by supplying high pressure water to the first and second ejection nozzles, respectively. Can do. For this reason, the time required for water jet peening for the inner and outer surfaces of the welded portion of the tubular body can be shortened.

  Preferably, by performing water jet peening on the inner and outer surfaces of the welded portion of the tubular body in parallel, the time required for the water jet peening can be further shortened.

  According to the present invention, the time required for water jet peening to the inner and outer surfaces of the tubular body can be further reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the water jet peening apparatus of Example 1 which is one preferable Example of this invention. It is explanatory drawing which shows the construction state of WJP to the in-core instrumentation cylinder in a reactor pressure vessel using the water jet peening apparatus shown in FIG. It is explanatory drawing which shows the state which attached the water jet peening apparatus shown in FIG. 1 to the work trolley | bogie. It is the IV-IV arrow line view of FIG. It is detailed explanatory drawing which shows the construction state of the water jet peening with respect to the inner surface of a reactor pressure vessel bottom part, and the welding part of an in-core instrumentation pipe | tube. It is an enlarged block diagram of the swing mechanism shown in FIG. FIG. 5 is an enlarged longitudinal sectional view of the vicinity of the welded portion of the reactor pressure vessel and the in-core instrument tube where the water jet peening shown in FIG. 4 is performed. It is a block diagram of the water jet peening apparatus of Example 2 which is another suitable Example of this invention. It is an enlarged view for IX of FIG. It is a block diagram of the water jet peening apparatus of Example 3, which is another preferred embodiment of the present invention. FIG. 6 is an enlarged side view of a pole and a cylindrical member included in part X of FIG. 5 as seen from the YY direction.

  Examples of the present invention will be described below.

  A water jet peening apparatus (hereinafter referred to as a WJP apparatus) according to a first embodiment which is a preferred embodiment of the present invention will be described with reference to FIGS. The WJP apparatus of the present embodiment is an example of a WJP apparatus used in a reactor pressure vessel of a pressurized water nuclear plant.

  The WJP device 1 of this embodiment includes a seating member 2, a turning unit 3, a lifting device (first lifting device) 12, an injection nozzle 19, 20, a swing mechanism 21, high pressure pumps 27A, 27B, and high pressure hoses 28A, 28B. It has.

  The turning part 3 is attached to the upper end part of the seating member 2 so as to be turnable using a bearing. The turning part 3 includes a frame part 4, a casing 6, a cylindrical member 10, and a turning drive device (for example, a motor) 11. The casing 6 is configured by attaching a bottom member 7 to a lower end portion of a cylindrical member 44 (for example, a cylindrical member having a square cross section) and attaching a top member 9 to an upper end portion of the cylindrical member 44. A space 8 is formed in the cylindrical member 44 of the casing 6. A cylindrical member 10 whose upper end is sealed is installed on the top surface of the top member 9 of the casing 6. The turning drive device 11 is disposed in the space 8 in the casing 6 and attached to the lower surface of the top member 9. The rotation shaft of the turning drive device 11 extends into the cylindrical member 10, and a pinion (not shown) attached to the rotation shaft of the turning drive device 11 is formed over the entire inner surface of the cylindrical member 10. Engage with gears.

  The frame unit 4 includes a device frame 5 extending in the axial direction of the WJP device 1 and a plate-like turning support member 30. The turning support member 30 is provided at the lower end of the apparatus frame 5 and is attached to the upper end portion of the seating member 2 so as to be turnable using a bearing. The device frame 5 is attached to the lower surface of the bottom member 7.

  The lifting device 12 includes a bar-shaped trapezoidal screw 14, a nozzle arm (first lifting member) 16, and a lifting drive device (for example, a motor) 13. The lower end of the trapezoidal screw 14 is rotatably attached to a support member 15 attached to the apparatus frame 5, and the upper end of the trapezoidal screw (first trapezoidal screw) 14 is rotatable to a support member 59 attached to the apparatus frame 5. Attached to. An elevating drive device (first elevating drive device) 13 is disposed in the space 8 of the casing 6 and attached to the upper surface of the bottom member 7. The rotating shaft of the elevating drive device 13 is connected to the trapezoidal screw 14 via a speed reducer (not shown). A nut (not shown) provided on the nozzle arm 16 meshes with the trapezoidal screw 14. The nozzle arm 16 is movably attached to the trapezoidal screw 14 via a nut.

  An injection nozzle 19 for the inner surface and an injection nozzle 20 for the outer surface are attached to the nozzle arm 16. The injection nozzle 19 is attached to a coupling member 25 attached to the nozzle arm 16 and extends downward from the coupling member 25. A lower end portion of the injection nozzle 19 is inserted into a through hole formed in the support member 15. An upper end portion of the injection nozzle 19 is connected to the high pressure nozzle 28 </ b> B in the coupling member 25. The support member 18 having an upper end attached to the nozzle arm 16 extends downward from the nozzle arm 16. In the present embodiment, the jet nozzle 19 and the jet nozzle 20 share the swivel unit 3 and the lifting device 12.

  A swing mechanism 21 is attached to the lower end of the casing 18. As shown in detail in FIG. 6, the swing mechanism (swee belt unit) 21 includes a casing 60, a motor 22, a water receiver 23, and a rotating shaft 24. The casing 60 is installed at the lower end of the casing 18, and the water receiver 23 is attached to the side surface of the casing 60. The rotating shaft 24 is rotatably attached to the casing 60 and the water receiver 23. The rotating shaft of the motor 22 is connected to the end portion of the rotating shaft 24 on the casing 60 side via the speed reducer 66. The injection nozzle 20 is attached to the rotating shaft 24. A water inflow region (not shown) is formed in the water receiver 23, and this water inflow region is connected to a high pressure hose 28 </ b> A connected to the water receiver 23. A seal for preventing water leakage is provided between the water receiving portion 23 and the rotary shaft 24. A high-pressure water supply passage 67 formed in the rotating shaft 24 communicates the water inflow region in the water receiving portion 23 and the injection nozzle 20.

  A cable bear (registered trademark) 17 is provided at the upper end portion of the support member 26 attached to the upper end of the nozzle arm 16. The high pressure hoses 28A and 28B are held by the cable bear 17 and are separately connected to the high pressure pumps 27A and 27B.

  Using the WJP apparatus 1, the WJP for each of the inner and outer surfaces of a plurality of in-core instrumentation tubes (tubular bodies) 32 that pass through the bottom of the reactor pressure vessel 31 of the pressurized water nuclear plant and are attached to the bottom of the hand. A construction method will be described with reference to FIGS.

  After the operation of the pressurized water nuclear plant is stopped, the upper cover (not shown) of the reactor pressure vessel 31 is removed, and a plurality of fuel assemblies and in-reactor structures arranged in the reactor pressure vessel 31 are obtained. The reactor is taken out of the reactor pressure vessel 31 and stored in a predetermined storage area. A work carriage 52 is disposed across the reactor pressure vessel 31 in a reactor containment vessel (not shown) surrounding the reactor pressure vessel 31 and is formed on the operation floor formed in the upper part of the reactor containment vessel. It is installed so as to be movable (see FIG. 2). The nuclear pressure vessel 31 is filled with cooling water 39.

  The WJP device 1 is rotatably attached to the top member 9 by a bearing (not shown) at a sealed lower end of the cylindrical member 10 and is held by a plurality of poles 29 connected to the upper end of the cylindrical member 10. The WJP device 1 is lowered toward the bottom of the reactor pressure vessel 31 in the reactor pressure vessel 31 by extending downward while the plurality of poles 29 are sequentially connected. The length of one pole 29 is 2 m so that it can be easily handled. The upper end of the pole 29 located at the uppermost position is suspended from a crane 57 installed in the reactor containment vessel.

  The mutual connection work of the plurality of poles 29 will be described. First, the pole 29 attached to the upper end of the cylindrical member 10 (the pole 29 positioned at the lowest position when the WJP device 1 is seated on the in-core instrument tube 32 which is a WJP object) is suspended from the crane 57. Then, the WJP apparatus 1 is immersed in the cooling water 39. The coupling between the pole 29 and the cylindrical member 10 is performed by attaching the flange 71 at the lower end of the pole 29 to the flange 72 at the upper end of the cylindrical member 10 (see FIG. 11). A support device (not shown) to which a holding device (not shown) is attached is attached to the work carriage 52. The upper end portion of the pole 29 suspended from the crane 57 is gripped by the holding device, and the gripped pole 29 is removed from the crane 57. Another pole 29 is connected to the upper end of the pole 29 held by the holding device, and the upper end of the connected pole 29 is hooked on the hook of the crane 57. In this state, the pole 29 held by the holding device is released from the holding device. The crane 57 is operated to lower the pole 29 suspended from the crane 57. By repeating such an operation, the plurality of poles 29 are sequentially connected, and the WJP apparatus 1 is lowered in the reactor pressure vessel 31. A ruled line 47 is drawn on the side surface of the flange 72 at the upper end of the cylindrical member 10 immediately above the injection nozzle 20 (see FIG. 11). A ruled line 47, which is a straight line extending in the axial direction of the pole 29, is drawn on the side surface of the flange 71 of the pole 29 (see FIG. 11), and further drawn on the outer surface of the pole 29 (FIG. 4). And FIG. 11). In the joining operation of the pole 29 and the cylindrical member 10, the ruled line 47 drawn on the side surface of the flange 71 of the pole 29 and the ruled line 47 drawn on the side surface of the flange 72 of the cylindrical member 10 are directed in the same direction. That is, the cylindrical member 10 and the pole 29 of the WJP device 1 are coupled so that the ruled line 47 drawn on the side surface of the flange 71 and the ruled line 47 drawn on the side surface of the flange 72 coincide. For this reason, the injection nozzle 20 can be made to correspond to the direction (relative position) of the ruled line 47 drawn on the side surface of the pole 29 located at the uppermost position. The direction of the injection nozzle 20 provided in the WJP apparatus 1 can be adjusted remotely by rotating a pole 29, as will be described later.

  The WJP apparatus 1 is located directly above the in-core instrumentation cylinder 32 where the WJP is constructed by operating the crane 57, and eventually sits on the upper end of the in-core instrumentation cylinder 32.

  In a state where the WJP apparatus 1 is seated on the upper end of the in-core instrument tube 32, the uppermost pole 29 among the plurality of connected poles 29 is connected to the upper handrail 55 and the lower handrail 56 of the work carriage 52. It is held by the attached pole holding device 40. The work carriage 52 includes a floor member 53 and a fence provided on the floor member 53. This fence has a plurality of bar members 54 that are vertically attached to the peripheral edge of the floor member 53 on the upper surface of the floor member 53, and the upper end portions of these bar members 54 are connected by upper handrail members 55. The bar member 54 has a configuration in which the central part in the vertical direction is connected by a lower handrail member 56.

  Here, the structure of the pole holding device 40 will be described with reference to FIGS. The pole holding device 40 includes a table 41, a turning holding part 42, and a handrail attaching part 48. The table 41, the turning holding part 42 and the handrail attaching part 48 are detachably attached to each other. The table 41 is attached to the upper surface of the base portion 49 integrated with the handrail attachment portion 48. The turning holding part 42 is attached to the table 41 so as to be turnable. A turning angle scale 43 is attached to the side surface of the turning holding portion 42 (see FIG. 4). A plurality of (for example, two) tightening screws 46 are attached to the swivel holding portion 42. A pair of handles 45 are provided on the turning holding portion 42. The handrail attachment portion 48 includes a frame 50 and an arm 51. An upper end portion of the frame 50 is attached to the base portion 49, and an arm 51 is attached to the lower end portion of the frame 50.

  The attachment of the pole holding device 40 to the pole 29 and the work carriage 52 will be described below. The slewing holding part 42 having a half structure is attached to the pole 29 located at the uppermost position suspended from the crane 57, and is fixed to the pole 29 by fastening a plurality of fastening screws 46. At this time, the turning holding portion 42 is located above the upper handrail member 55 of the fence of the work carriage 52. The base portion 49 is seated on the upper handrail member 55, and the upper handrail member 55 is inserted into a groove formed on the lower surface of the base portion 49 integrated with the handrail attachment portion 48. The table 41 is installed on the base portion 49. At this time, the table 41 is in contact with the base portion 49. The tightening screw 46 is loosened, the turning holding part 42 is lowered along the pole 29, and the turning holding part 42 is seated on the table 41. After the swivel holding portion 42 is seated on the table 41, the arm 51 of the handrail attachment portion 48 is fixed to the lower handrail member 56.

  A ruled line 47 that is a straight line extending in the axial direction of the pole 29 is attached to the outer surface of the pole 29 attached to the turning holding portion 42 (see FIG. 4). The ruled lines 47 and the turning angle scale 43 of the turning holding portion 42 are aligned with each other, and the tightening screws 46 are tightened to clamp the pole 29 to the turning holding portion 42. In this state, an operator who is placed on the floor member 53 of the work carriage 52 rotates the handle 45 and observes the angle of the turning angle scale 43 where the ruled line 47 is located, and the direction of the injection nozzle 20 is changed. An initial reference position within the reactor pressure vessel 31 (at the position of the injection nozzle 20 indicated by the solid line in FIG. 7, the injection port of the injection nozzle 20 faces the center of the reactor pressure vessel 31). In this way, the injection port of the injection nozzle 20 is set in a predetermined direction. Thus, the attachment of the pole holding device 40 to the pole 29 and the work carriage 52 is completed. Thereafter, WJP to the in-core instrument tube 32 is performed.

  When the seating member 2 is seated on the upper end of the in-core instrument tube 32 that is a WJP object, the upper end portion of the in-core instrument tube 32 welded to the bottom of the reactor pressure vessel 31 is placed in the seat member 2. It is inserted into the formed insertion hole 34 (see FIG. 5). The injection nozzle 19 and the injection nozzle 20 that are located directly above the in-core instrumentation cylinder 32 are lowered.

  The trapezoidal screw 14 is rotated by driving the lift drive device 13 of the lift device 12. At this time, the nozzle arm 16 meshed with the trapezoidal screw 14 with the nut is lowered, and the injection nozzle 19 is inserted into the insertion hole 34 through the through hole 33 formed in the seating member 2. Inserted inside. The injection port of the injection nozzle 20 is located outside the in-core instrumentation cylinder 32 in the reactor pressure vessel 31 and faces the outer surface of the welded portion 58 of the in-core instrumentation cylinder 32 and the reactor pressure vessel 31. ing. By the lifting device 12, the spray nozzle 19 and the spray nozzle 20 are lifted and lowered simultaneously. The rotation shaft 24 is rotated by driving the motor 22 of the swing mechanism 21, and the inclination angle of the injection nozzle 20 is adjusted so that the injection port of the injection nozzle 20 faces the outer surface of the welded portion 58. As described above, the position of the injection port of the injection nozzle 20 in the axial direction of the reactor pressure vessel 31 is adjusted by the lifting device 12 and the swing mechanism 21.

  The injection nozzle inserted into the in-core instrument tube 32 when the target position of the jet 36 (see FIG. 5) injected from the injection nozzle 20 is the position 61A on the outer surface of the weld as shown in FIG. The target position of the jet 35 (see FIG. 5) injected from the 19 injection ports is a position 62A with respect to the inner surface of the in-core instrument tube 32 as shown in FIG. Further, when the target position of the jet flow 36 from the injection nozzle 20 is the position 61B on the outer surface of the welded portion as shown in FIG. 7 after the injection nozzle 20 turns 180 ° from the position 61A, the jet flow 35 from the injection nozzle 19 7 is a position 62B with respect to the inner surface of the in-core instrument tube 32 as shown in FIG. The lower end of the injection nozzle 19 is positioned below the lower end of the injection nozzle 20 so that the target position of the jet flow 36 from the injection nozzle 20 and the corresponding target position of the jet 35 from the injection nozzle 19 can be adjusted. The fine adjustment of both positions is performed by the vertical rotation of the injection nozzle 20 by the swing mechanism 21.

  After the respective positions of the injection nozzles 19 and 20 in the axial direction of the reactor pressure vessel 31 are set to predetermined positions, the high-pressure pumps 27A and 27B are driven. The injection nozzle 20 is set, for example, at a position indicated by a solid line shown in FIG. The high-pressure water boosted by the high-pressure pump 27A is supplied to the injection nozzle 20 through the high-pressure hose 28A. The high pressure water is jetted from the jet nozzle 20 into the jet 36 toward the outer surface of the weld 58 in the cooling water 39 in the reactor pressure vessel 31. A large number of cavitation bubbles are included in the jet 36, and shock waves are generated by the collapse of these cavitation bubbles. This shock wave collides with the outer surface of the welded portion 58, WJP is applied to the outer surface of the welded portion 58, and compressive residual stress is applied to the outer surface. In this way, the residual stress on the outer surface of the weld 58 is improved.

  When high-pressure water is supplied from the high-pressure pump 27A to the injection nozzle 20, the high-pressure water boosted by the high-pressure pump 27B is supplied to the injection nozzle 19 in the in-core instrument tube 32 through the high-pressure hose 28B. The high-pressure water is jetted from the jet nozzle 19 into the jet 35 toward the inner surface of the welded portion 58 in the cooling water 39 in the in-core instrument tube 32. The jet 35 also includes a large number of cavitation bubbles. A shock wave generated by the collapse of these cavitation bubbles collides with the inner surface of the welded portion 58, WJP is applied to the inner surface of the welded portion 58, and compressive residual stress is applied. Is applied to the inner surface. In this way, the residual stress on the inner surface of the weld 58 is improved. In the present embodiment, WJP can be simultaneously applied to the inner and outer surfaces of the welded portion 58 of the reactor pressure vessel 31 and the in-core instrumentation cylinder 32. In addition, the lower end of each in-core instrumentation cylinder 32 is sealed, and the cooling water 39 in the reactor pressure vessel 31 is prevented from leaking outside through the in-core instrumentation cylinder 32.

  The swivel drive device 11 is driven while jets 35 and 36 are jetted from the jet nozzles 19 and 20, respectively. The rotational force of the turning drive device 11 is transmitted to the cylindrical member 10 to turn the cylindrical member 10 around the central axis of the cylindrical member 10. As the cylindrical member 10 turns, the frame part 4 and the casing 6 above the seating member 2, that is, the turning part 3 turns. As a result, since the nozzle arm 16 turns, the injection nozzle 20 turns 180 ° around the in-core instrument tube 32, for example, clockwise. The injection nozzle 19 also turns in the same direction in the in-core instrumentation cylinder 32. By such swirling of the nozzles 19 and 20 that are jetting each jet, WJP is applied to each of the 180 ° ranges on the inner and outer surfaces of the welded portion 58. When the injection nozzle 20 moves from the position shown by the solid line in FIG. 7 to the position shown by the dotted line by such swiveling of the injection nozzle 20, the nozzle arm 16 reaches from the position shown by the solid line to the position shown by the dotted line. It is lowered by the lifting device 12 in accordance with the curved surface at the bottom of 31.

  After the WJP is applied to the 180 ° region on the inner and outer surfaces of the welded portion 58 as described above, the turning drive device 11 is rotated in the reverse direction, and the injection nozzle 20 is moved along the outer surface of the in-core instrument tube 32. Is turned counterclockwise. After the injection nozzle 20 is returned to the position indicated by the solid line in FIG. 7, the injection nozzle 19 that injects the jet 35 and the injection nozzle 20 that injects the jet 36 are counteracted by driving the swivel drive device 11. In the clockwise direction, the injection nozzle 20 is swung until it reaches the position of the dotted line in FIG.

  Therefore, by rotating the injection nozzle 20 or the like, WJP can be applied over the entire circumference of the inner and outer surfaces of the welded portion 58, and the residual stress on the inner and outer surfaces of the welded portion 58 can be improved.

  The upward reaction force generated by jetting jets from the jet nozzles 19 and 20 is caused by the weight of the WJP device 1 and the handrail member 55 and the lower handrail of the work carriage 52 by using the pole 29 with the pole 29. It can support by fixing to the member 56.

  After the construction of WJP on the inner and outer surfaces of the welded portion 58 in one in-core instrumentation cylinder 32 is finished, the driving of the high-pressure pumps 27A and 27B is stopped, and the elevating device 12 is driven to inject the injection nozzles 19 and 20 And the injection nozzle 19 is moved to a position above the upper end of the in-core instrumentation cylinder 32. Each clamping screw 46 is loosened, the pole 29 is raised by the crane 57, and the seating member 2 is moved to a position above the upper end of the in-core instrumentation cylinder 32. When the seating member 2 reaches a position above the upper end of the in-core instrument tube 32, the operation of the crane 57 is stopped and the work carriage 52 is moved in the horizontal direction. Further, the operator on the work carriage 52 moves the base portion 49 in the horizontal direction along the upper handrail member 55, thereby positioning the injection nozzle 19 directly above another in-core instrument tube 32. As described above, the WJP device 1 is lowered by the crane 57, and the seating member 2 is seated on the upper end of the other in-core instrumentation cylinder 32 described above. The elevating device 12 is driven to lower the nozzle arm 16, and the injection nozzle 19 is inserted into the in-core instrument tube 32 through the through hole 33. Thereafter, as described above, jets are jetted from the respective jet nozzles, and WJP is applied to the inner and outer surfaces of the welded portion 58 of the in-core instrumentation cylinder 32.

  In this way, WJP is performed sequentially on the inner and outer surfaces of the welded portion 58 of each in-core instrumentation cylinder 32 provided at the bottom of the reactor pressure vessel 31.

  The WJP apparatus 1 of the present embodiment includes an inner surface injection nozzle 19 and an outer surface injection nozzle 20 in order to apply WJP to each of the inner and outer surfaces of the in-core instrument tube 32 that is a tubular body, These spray nozzles are provided in the swivel unit 3. For this reason, by arranging the injection nozzle 19 in the in-core instrumentation cylinder 32 and disposing the injection nozzle 20 outside the in-core instrumentation cylinder 32, the WJP is simultaneously applied to the inner and outer surfaces of the in-core instrumentation cylinder 32. Can be constructed. In the WJP in this embodiment, the WJP on the inner and outer surfaces of the in-core instrumentation cylinder 32 is applied using a WJP device having an inner surface injection nozzle and another WJP device having an outer surface injection nozzle as in the prior art. Compared to the case, it is not necessary to replace the WJP device, and it is not necessary to perform WJP to the outer surface after WJP to the inner surface of the in-core instrument tube 32. The time required for constructing WJP inside and outside can be significantly reduced.

  In this embodiment, the injection nozzles 19 and 20 are attached to the elevating member (nozzle arm 16) of the elevating device 12 provided in the revolving unit 3, and the revolving unit and the elevating device of the injection nozzles 19 and 20 are shared. Yes. As a result, the spray nozzles 19 and 20 can be lifted and lowered simultaneously. For this reason, the position of the reactor pressure vessel 31 on the center side of the reactor pressure vessel 31 of the in-core instrumentation cylinder 32 attached to the curved surface portion of the bottom of the reactor pressure vessel 31 and the position 180 ° opposite to this position. Even in the case where there is a height difference in the welded portion 58 at the outer position, the curved surface at the bottom of the reactor pressure vessel 31 is swung while moving the elevating member attached with the injection nozzles 19, 20 up and down. Each spray nozzle can be moved up and down along. Therefore, WJP along the curved surface of the bottom of the reactor pressure vessel 31 can be appropriately performed on the inner and outer surfaces of such a welded portion 58.

  Since the through hole 33 communicating with the inside of the in-core instrumentation cylinder 32 is formed in the seating member 2, when the WJP device 1 is lowered and the seating member 2 is seated on the upper end of the in-core instrumentation cylinder 32, the injection The nozzle 19 can be easily inserted into the in-core instrument tube 32 through the through hole 33 formed in the seating member 2.

  Since the pole 29 attached to the WJP device 1 is attached to the work carriage 52 by the pole holding device 40, when the jet flow is jetted from the jet nozzles 19 and 20 at the time of WJP construction, It can prevent moving in the horizontal direction. The load of the WJP device 1 is held by the crane 57.

  Since a linear ruled line 47 is attached to the outer surface of the pole 29 and a turning angle scale 43 is attached to the turning holding portion 42 attached to the work carriage 52, the ruled line 47 is set to a predetermined scale of the turning angle scale 43. By adjusting to, the direction of the injection port of the injection nozzle 20 can be easily adjusted.

  Since the spray nozzles 19 and 20 are swung by the common swivel unit 3 and are provided in the common lifting device 12, it is not necessary to provide separate operation panels for the spray nozzles 19 and 20, and one operation panel Therefore, the turning operation of the turning unit 3 and the raising / lowering operation of the lifting device 12 can be controlled, so that the WJP device 1 can be downsized.

  A water jet peening apparatus according to embodiment 2, which is another preferred embodiment of the present invention, will be described with reference to FIG. The WJP apparatus 1A of this embodiment is an example of a WJP apparatus used in a reactor pressure vessel of a pressurized water nuclear plant.

  The WJP apparatus 1A of the present embodiment is the same as the WJP apparatus 1 of the first embodiment except that the nozzle arm 16 has a long guide portion 64 projecting downward to which a nut meshing with the trapezoidal screw 14 is attached, and the guide portion 64 It has a structure provided with a lifting member (second lifting member) 63 that moves in the direction. The coupling member 25 is attached to the elevating member 63. Other configurations of the WJP apparatus 1A are the same as those of the WJP apparatus 1 of the first embodiment.

  The WJP on the inner and outer surfaces of the welded portion 58 of the in-core instrumentation cylinder 32 attached to the bottom having the curved surface of the reactor pressure vessel 31 using the WJP apparatus 1A is performed in the same manner as in the first embodiment. In this embodiment, the spray nozzles 19 and 20 are moved up and down together by moving the nozzle arm (first lift member) 16 up and down by the lift device 12, and the spray nozzle 19 can be lifted and lowered independently by the lift member 63. it can.

  Because the bottom of the reactor pressure vessel 31 forms a curved surface, the reactor pressure of the in-core instrumentation cylinder 32 at the weld 58 of the in-core instrumentation tube 32 and the bottom of the reactor pressure vessel 31 is determined. The height difference H (see FIGS. 5 and 7) generated at the position on the center side of the vessel 31 and the position outside the reactor pressure vessel 31 opposite to this position by 180 ° is the center axis of the reactor pressure vessel 31. It differs in the vicinity and the periphery of the reactor pressure vessel 31 away from the central axis. This height difference H increases as the distance from the central axis of the reactor pressure vessel 31 increases. When the height difference H is small, it can be absorbed by the vertical rotation of the spray nozzle 20 by the swing mechanism 21. However, if the height difference H becomes large, it cannot be absorbed only by the swing mechanism 21.

  In the present embodiment, the difference in height difference H depending on the installation position of the in-core instrumentation cylinder 32 at the bottom of the reactor pressure vessel 31 can be absorbed by raising and lowering the injection nozzle 19 with the elevating member 63. The elevating member 63 is moved in the vertical direction by an elevating device (second elevating device) 70 provided on the nozzle arm 16 (see FIG. 9). Similarly to the lifting device (first lifting device) 12, the lifting device 70 is a lifting drive device (for example, a motor) 72, which is a second lifting drive device, and a rod-shaped trapezoidal screw (first screw) connected to the lifting drive device 72. 2 trapezoidal screws) 73. The lifting drive device 72 is attached to the upper surface of the nozzle arm 16. The trapezoidal screw 73 is disposed in parallel with the trapezoidal screw 14 and is rotatably attached to the nozzle arm 16. The upper end portion of the trapezoidal screw 73 is connected to the lifting drive device 72, and the lower end portion of the trapezoidal screw 73 is rotatably supported by the nozzle arm 16. A nut 74 attached to the elevating member 63 is engaged with the trapezoidal screw 73.

  In the welded portion 58 of the in-core instrumentation cylinder 32 arranged in the peripheral part of the reactor pressure vessel 31, the height difference H is larger than that in the in-core instrumentation cylinder 32 arranged in the vicinity of the central axis of the reactor pressure vessel 31. On the other hand, when constructing WJP, a trapezoidal screw 73 is rotated by driving an elevating drive device 72 provided on the nozzle arm 16, and the rotation of the trapezoidal screw 73 includes a nut 74 that meshes with the trapezoidal screw 73. The raising / lowering member 63 is lowered along the guide portion 64 in the axial direction of the trapezoidal screw 73. The injection nozzle 19 descends together with the elevating member 63. Thereby, the distance in the axial direction of the nuclear pressure vessel 31 between the position of the lower end of the injection nozzle 19 and the lower end of the injection nozzle 20 is increased. The injection nozzle 19 is lowered by the elevating member 63 either before or after the injection nozzle 19 is inserted into the in-core instrument tube 32. For example, after the distance between the lower end of the injection nozzle 19 and the lower end of the injection nozzle 20 is increased by the elevating member 63, the injection nozzles 19, 20 are lowered by moving the nozzle arm 16 downward by the elevating device 12. The injection nozzle 19 is inserted into the in-core instrumentation tube 32, and the injection nozzle 20 faces the outer surface of the welded portion 58 outside the in-core instrumentation tube 32.

  High pressure water is supplied to each of the injection nozzles 19 and 20, and the nozzles are swirled while jetting the jets 35 and 36, respectively. As in the first embodiment, the entire circumference of the inner surface and the outer surface of the welded portion 58 is applied. Install WJP.

  Thereafter, when WJP is applied to the welded portion 58 of the in-core instrument tube 32 located near the center line of the reactor pressure vessel 31 having a small height difference H, the elevating member 63 is raised by the elevating drive device 72. The distance between the lower end of the injection nozzle 19 and the lower end of the injection nozzle 20 is reduced. Thereby, a better WJP can be applied to the inner and outer surfaces of the welded portion 58 of the in-core instrument tube 32 located near the center line of the reactor pressure vessel 31 with a small height difference H.

  In the present embodiment, each effect produced in the first embodiment can be obtained. In this embodiment, among the spray nozzles 19 and 20 held by the nozzle arm 16 which is a common lift member, the spray nozzle 19 can be lifted and lowered independently by the lift member 63 and the lift device 70. Therefore, it is possible to perform the WJP on the inner and outer surfaces of the welded portion 58 with respect to the welded portions 58 having different values.

  A water jet peening apparatus according to embodiment 3 which is another preferred embodiment of the present invention will be described with reference to FIG. The WJP apparatus 1B of the present embodiment is an example of a WJP apparatus used in a reactor pressure vessel of a pressurized water nuclear plant.

  The WJP apparatus 1B according to the present embodiment has a configuration in which the switching valves 65A and 65B are provided in the high pressure hoses 28A and 28B connected to one shared high pressure pump 27A in the WJP apparatus 1 according to the first embodiment. The other configuration of the WJP apparatus 1B is the same as that of the WJP apparatus 1.

  Also in the present embodiment, as in the first embodiment, the injection nozzle 19 is inserted into the in-core instrument tube 32, the injection nozzle 20 is disposed outside the in-core instrument tube 32, and the inner surface of the welded portion 58 and WJP to the outside surface is constructed respectively. Unlike the first embodiment, the present embodiment differs in the supply of high-pressure water to the spray nozzles 19 and 20 and cannot perform WJP on the inner and outer surfaces of the welded portion 58 at the same time. For example, the switching valve 65B is closed and the switching valve 65A is opened, and high pressure water pressurized by the high pressure pump 27 is supplied to the injection nozzle 20. Thereby, the jet 36 is injected from the injection nozzle 20 and WJP to the outer surface of the welding part 58 is implemented. After WJP is applied over the entire outer periphery of the welded portion 58, the switching valve 65B is opened and the switching valve 65A is closed. As a result, the high-pressure water discharged from the high-pressure pump 27 </ b> A is inserted into the in-furnace instrumentation cylinder 32 and supplied to the swirling injection nozzle 19, and is jetted into the in-furnace instrumentation cylinder 32 as a jet 35. WJP is applied to the inner surface of the in-core instrument tube 32.

  In the present embodiment, the effects produced in the first embodiment can be obtained. However, in the present embodiment, WJP cannot be simultaneously applied to the inner and outer surfaces of the welded portion 58 as in the first embodiment, so that the time required for the WJP is longer than that in the first embodiment. However, since it is not necessary to replace the WJP device for the inner surface of the in-core instrumentation cylinder 32 and the WJP device for the outer surface of the in-core instrumentation tube 32, the time required for WJP construction can be shortened compared to the conventional WJP. Can do.

  DESCRIPTION OF SYMBOLS 1A, 1B ... Water jet peening apparatus, 2 ... Seating member, 3 ... Turning part, 4: Frame part, 6 ... Casing, 11 ... Turning drive apparatus, 12 ... Lifting apparatus, 13 ... Lifting drive apparatus, 14 ... Trapezoid screw, DESCRIPTION OF SYMBOLS 16 ... Nozzle arm, 19, 20 ... Injection nozzle, 21 ... Swing mechanism, 27A, 27B ... High pressure pump, 28A, 28B ... High pressure hose, 29 ... Pole, 30 ... Swing support member, 31 ... Reactor pressure vessel, 32 ... In-core instrument tube, 40 ... Pole holding device, 41 ... Table, 42 ... Swivel holding part, 43 ... Swivel angle scale, 46 ... Tightening screw, 47 ... Rectangle line, 49 ... Base part, 50 ... Frame, 52 ... work carriage, 63 ... elevating member, 65A, 65B ... switching valve.

Claims (10)

  A first elevating device having a seating member, a swivel portion that is pivotally attached to the seating member and disposed above the seating member, a first elevating member that is provided on the swivel portion and is raised and lowered; When the seat is lifted and lowered by the first lifting member and the seating member is seated on the tubular body that is a water jet peening object, the first injection nozzle inserted into the tubular body and the first lifting member are attached. A water jet peening apparatus comprising: a second injection nozzle disposed outside the tubular body when the seating member is seated on the tubular body.   The water jet peening apparatus according to claim 1, wherein a through hole into which the first injection nozzle is inserted is formed in the seating member.   3. The water according to claim 1, further comprising a second lifting device attached to the first lifting member and having a second lifting member to be lifted and lowered, wherein the first injection nozzle is attached to the second lifting member. Jet peening device.   2. The water jet peening apparatus according to claim 1, wherein the second injection nozzle is attached to the first elevating member via a swing mechanism that rotates the second injection nozzle in the vertical direction.   A high-pressure pump, a first high-pressure hose connected to the first injection nozzle, a second high-pressure hose connected to the second injection nozzle, the first hose and the second hose are discharge ports of the high-pressure pump The water jet peening apparatus according to claim 1, further comprising a switching valve device that is switched to and connected.   A high pressure pump; a first high pressure hose connected to the first injection nozzle; a second high pressure hose connected to the second injection nozzle; a first on-off valve provided in the first hose; The water jet peening apparatus according to claim 1, further comprising a second on-off valve provided on the two hoses. Water for performing water jet peening on each of the tubular body provided at the bottom of the reactor pressure vessel and the inner and outer surfaces of the welded portion of the reactor pressure vessel using the water jet peening apparatus according to claim 1. A jet peening method,
The seat member is seated on the tubular body in the reactor pressure vessel filled with water, the first elevating member is lowered to insert the first spray nozzle into the tubular body, and the second spray nozzle is Arranged outside the tubular body,
Water jet peening is applied to the inner surface of the weld by spraying a water jet from the first injection nozzle,
A water jet peening method, wherein water jet peening is applied to the outer surface of the welded portion by jetting water from the second jet nozzle. A second elevating device attached to the first elevating member and having a second elevating member to be moved up and down, wherein the first jet nozzle is attached to the second elevating member;
Adjusting the distance in the axial direction of the reactor pressure vessel between the first injection nozzle and the second injection nozzle by raising and lowering the second elevating member;
The water jet peening method according to claim 7, wherein the jet flow is jetted from each of the first jet nozzle and the second jet nozzle in which the distance is adjusted.   The water jet peening method according to claim 7 or 8, wherein the jet is jetted from the second jet nozzle when the jet is jetted from the first jet nozzle.   Holding the pole attached to the upper end of the water jet peening apparatus using a swivel holding member of a pole holding apparatus attached to a handrail part of a work carriage disposed above the reactor pressure vessel, The water jet peening method according to claim 7, wherein the direction of the injection port of the second injection nozzle is adjusted by turning the turning holding unit.

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