| 摘要 |
PROBLEM TO BE SOLVED: To restrain a structure material in an inside of a crack from being corroded even when moisture is remained in the inside of the crack after repair welding, in the case where a crack-like defective part is generated on a metal surface of a nuclear reactor structure and repair welding thereof is performed. SOLUTION: An impurity such as an oxide coating film is removed from the surface in the vicinity of a crack-like defect of the nuclear reactor structure (S1), a sacrificial anode having a metal material (for example, aluminum) indicating a potential baser than a metal material of the nuclear reactor structure is arranged in the vicinity of the crack-like defect of the nuclear reactor structure (S2), and the whole including all the sacrificial anode and the crack-like defect is welded and coated with coverage of a sheet material, so as to be isolated from an outside environment. COPYRIGHT: (C)2006,JPO&NCIPI
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