学会規格作りとコードエンジニアの役割　　軽水炉における環境疲労評価手法の事例

概要

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The design and construction codes for nuclear power plants worldwide have been established based on ASME Sec. III. Since the requirements of fatigue evaluation were first introduced in the ASME codes in 1963, the fatigue evaluation methods have been used with few changes. In 2006, the world's first consensus codes for the environmental fatigue evaluation method have been established in JSME. The codes incorporate the results of international research projects mainly led by Japan on the environmental fatigue, that is, the reduced fatigue life of components in a high-temperature reactor coolant environment. This is a good example of international collaboration involving code engineers with expertise in the field of codes and standards. In these projects, the Japanese team contributed to the establishment of the world-leading codes for environmental fatigue evaluation. This paper describes the activities leading to the establishment of the codes for environmental fatigue evaluation, development of the evaluation method, roles of code engineers and remaining technical issues to be addressed.