Abstract
Stress corrosion cracking (SCC) in the weld joint of Ni-base alloy occurs in Japanese and foreign nuclear power plants. In applying fracture mechanics it is important to clarify the SCC crack that propagates by various factors for the reliability of the aged plants. In this study, axial surface cracks are assumed to the weld metal of weld H-11 in BWR shroud support structure. And arbitrary loads are given to the surface crack and stress intensity factor K is calculated by the FEM analysis. The coverage of the crack configuration provided for by Rules on Fitness-for-Service for Nuclear Power Plants and the engineering effectiveness of the K solution for plate are examined.
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