Probabilistic fracture mechanics (PFM) analysis code PASCAL3 has been developed to apply the PFM analysis to the structural integrity assessment of domestic reactor pressure vessels (RPVs). In this paper, probabilistic evaluation models of fracture toughness KIc and KIa which have the largest scatter among the associated factors based on the database of Japanese RPV steels are presented. We developed probabilistic evaluation models for KIc and KIa based on the Weibull and lognormal distributions, respectively. The models are compared with the existing lower bound of fracture toughness in the Japanese code and probabilistic model in USA. As the results, the 5% confidence limits of the models established in present work corresponded to lower bounds of fracture toughness in the Japanese code. The comparison in the models between present work and USA showed significant differences that may have an influence on fracture probability of RPV.
Development of Probabilistic Evaluation Models of Fracture Toughness KIc and KIa for Japanese RPV Steels
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Katsuyama, J, Katsumata, G, Onizawa, K, Osakabe, K, & Yoshimoto, K. "Development of Probabilistic Evaluation Models of Fracture Toughness KIc and KIa for Japanese RPV Steels." Proceedings of the ASME 2015 Pressure Vessels and Piping Conference. Volume 1B: Codes and Standards. Boston, Massachusetts, USA. July 19–23, 2015. V01BT01A017. ASME. https://doi.org/10.1115/PVP2015-45915
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