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Effect of large-scale seismic loading on crack growth rate and structural reliability of nuclear reactor piping

Yamaguchi, Yoshihito ; Li, Y.* ; Katsuyama, Jinya  ; Onizawa, Kunio 

In recent years, Japanese nuclear power plants experienced multiple large earthquakes, such as Niigata-ken Chuetsu-Oki Earthquake in 2007 and the Great East Japan Earthquake in 2011. The magnitude of these earthquakes exceeded the design-base condition for some nuclear power plants. Therefore it is an important issue to establish the evaluation method of excessive loading on the structural integrity of reactor components. In this study, the crack growth behaviors were investigated based on an elastic-plastic fracture mechanics parameter, J-integral. It was indicated that the crack growth due to the cyclic excesive loading could be the sum of fatigue and ductile crack growth. The retardation effect on the crack growth due to excessive loading was observed from experiments. An evaluation method for the amount of crack growth under cyclic excessive loading is suggested based on J-integral. The effect of excessive loading on the failure probability of piping is also evaluated by probabilistic fracture mechanics analysis.

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