| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and system capable of efficiently repairing in a short time, when a work of repairing instrumentation tube of jet pump has incurred during service period. SOLUTION: In-reactor equipment are removed, centers of broken instrumentation tubes are tentatively aligned, the breakage cross sections are held at nearly aligned positions by the tentative matching, tube outer surface is polished, and the breakage positions are tentatively welded (S101 to 104), by introducing a tentative welder in the reactor. When tentative welding is completed, the tentative welder is taken out of the reactor for total seal welding of the tentatively finished instrumentation tube, and a seal welder is introduced in the reactor and attached to the tentatively welded instrumentation tube. Well water is drained and seal welding of the instrumentation tube is conducted (S105 to 107), by operating the seal welder in pneumatic environment. Then, the pressure vessel is filled with water, the seal welder is taken out, and in-reactor components are recovered (S108 to 110) for finishing the work. COPYRIGHT: (C)2005,JPO&NCIPI
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