Abstract: In an installation device of a reactor repair device and a method, an installation pole (111) connected with an upper portion of a water jet peening device (101), a lifting device (112) that can suspend and support an upper portion of the installation pole (111) and can lift the installation pole (111) from a work floor (121), a moving device (113) that can move the lifting device (112) in two directions intersecting in a horizontal direction, and a position adjustment device (114) that can move the installation pole (111) in the horizontal direction in a state where the installation pole (111) is supported by the lifting device (112).

Abstract: Provided is a water jet peening apparatus and a water jet peening method including: a clamping cylinder (201) which is able to be disposed at the outer peripheral side of an instrumentation nozzle (83) with a predetermined gap therebetween; a clamping piece (210) which is able to fix the clamping cylinder (201) to the instrumentation nozzle (83); a nozzle guide (221) which has a cylindrical shape, is provided inside the clamping cylinder (201), and is positioned to a position adjacent to the upper end of the instrumentation nozzle (83); an inner surface WJP nozzle (105) which is movable upward and downward inside the nozzle guide (221); and a drainage hole (224) which radially penetrates the nozzle guide (221). Accordingly, it is possible to improve the safety of the operation by preventing a thimble tube from being popped out due to a water jet peening operation.

Abstract: Apparatus for replacing a support pin for a control rod cluster guide tube. The support pin can fix the guide tube to a core plate. The apparatus can be used submerged in water. A movement device can hold and move the guide tube along a frame. A retrieval manipulator can remove an old support pin from the guide tube. A supply manipulator can provide a new support pin to the guide tube. A rotating means imparts rotation for loosening a nut from an old support pin, and for tightening a nut to a new support pin. A control device calculates variation in distance between the nut and the support pin on the basis of the rotation. The control device controls movement of the guide tube along the frame.

Abstract: It is possible to improve the workability and the stress corrosion resistance by easily performing a repairing operation in a nozzle repairing method and a nuclear reactor vessel. The repairing method includes: removing a first connection portion ((trepanned portion) 208) with respect to an in-core instrument tube (204) in a groove-welding portion (206); removing the in-core instrument tube (204) from a lower mirror (66); leaving and grooving a second connection portion ((existing welding portion) 211) with respect to the lower mirror (66) in the groove-welding portion (206); inserting a new in-core instrument tube (204A) into an attachment hole (203); and groove-welding (so as to form a new groove-welding portion (213)) the inner side of the lower mirror (66) so as to fix the new in-core instrument tube (204A).

Abstract: In an installation device of a reactor repair device and a method, an installation pole (111) connected with an upper portion of a water jet peening device (101), a lifting device (112) that can suspend and support an upper portion of the installation pole (111) and can lift the installation pole (111) from a work floor (121), a moving device (113) that can move the lifting device (112) in two directions intersecting in a horizontal direction, and a position adjustment device (114) that can move the installation pole (111) in the horizontal direction in a state where the installation pole (111) is supported by the lifting device (112).

Abstract: Provided is a water jet peening apparatus and a water jet peening method including: a clamping cylinder (201) which is able to be disposed at the outer peripheral side of an instrumentation nozzle (83) with a predetermined gap therebetween; a clamping piece (210) which is able to fix the clamping cylinder (201) to the instrumentation nozzle (83); a nozzle guide (221) which has a cylindrical shape, is provided inside the clamping cylinder (201), and is positioned to a position adjacent to the upper end of the instrumentation nozzle (83); an inner surface WJP nozzle (105) which is movable upward and downward inside the nozzle guide (221); and a drainage hole (224) which radially penetrates the nozzle guide (221). Accordingly, it is possible to improve the safety of the operation by preventing a thimble tube from being popped out due to a water jet peening operation.

Abstract: A clearance increasing jig of a heat transfer tube, includes: a jig main body inserted into a clearance between adjacent heat transfer tubes; an inflow hole provided in the jig main body and configured to allow a fluid to flow into the jig main body; and an increasing unit provided in the jig main body and configured to increase the clearance as the fluid flows into the jig main body.

Abstract: The support pin replacing apparatus for a control rod cluster guide tube includes a frame submerged in water, a movement device that holds the control rod cluster guide tube and moves the control rod cluster guide tube along the frame, a retrieval manipulator that retrieves a support pin of the control rod cluster guide tube under the water, a supply manipulator that supplies a new support pin to the control rod cluster guide tube under the water, a rotating means that imparts rotation for loosening or tightening a fastening between a nut of the support pin or the new support pin and the support pin main body, and a control device that calculates variation in distance between the nut and the support pin main body on the basis of the rotation, and controls the control rod cluster guide tube to move along the frame.

Abstract: The heat exchanger includes: a plurality of heat transfer tubes which is arranged and provided with predetermined gaps; and a plurality of second vibration suppression members 14B which is provided in the gaps and is provided on both sides sandwiching each of the heat transfer tubes 5, and one second vibration suppression member 14B and the other second vibration suppression member 14B of a plurality of second vibration suppression members 14B are provided at different positions in an axial direction of the heat transfer tubes 5 sandwiching the heat transfer tubes 5, the one second vibration suppression member 14B is provided pressing the heat transfer tubes 5; and the other second vibration suppression member 14B is provided pressing the heat transfer tubes 5 from an opposite side of the one second vibration suppression member 14B.

Abstract: A clearance increasing jig of a heat transfer tube, includes: a jig main body inserted into a clearance between adjacent heat transfer tubes; an inflow hole provided in the jig main body and configured to allow a fluid to flow into the jig main body; and an increasing unit provided in the jig main body and configured to increase the clearance as the fluid flows into the jig main body.