| 摘要 |
PROBLEM TO BE SOLVED: To provide a maintenance apparatus and method of welded joints, by which the welded joints of a plurality of nozzles installed in a pressure container can be maintained in a short period. SOLUTION: In a maintenance apparatus 6 of welded joints 5 for which cladding by welding is performed on the inner face of the welded joints 5 formed between nozzles 3 and piping 4 installed in plurality in the pressure container 1 of a nuclear reactor; there is arranged, in the upper part of the pressure container 1, a structure 7 that is rotatable around the center axis of the pressure container 1. The structure 7 is hangingly provided with a pair of base parts 9, 10 that are arranged vertically apart inside the pressure container 1. In these base parts 9, 10, nozzle plug devices 13, 14 are installed in-between movably in the radial direction through rail members 11, 12 and in a manner to be situated between the base parts 9, 10, wherein the nozzle plug devices 13, 14 are inserted in the nozzles 3 for grooving and for cladding-by-welding on the inner face of the welded joints 5. With one nozzle plug device 13 situated in the center part of the pressure container 1, for the purpose of retreating the other nozzle plug device 14 to the outer periphery of the pressure container 1, the other rail member 12 is installed movably in a direction crossing the moving direction of the one nozzle plug device 13. COPYRIGHT: (C)2010,JPO&INPIT |
