OS1429 照射劣化のばらつきを考慮した破壊パラメータの確率論的評価

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  • OS1429 Stochastic Evaluation of Fracture Parameters Considering Dispersion of Radiation-induced Degradation

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Austenitic stainless steel is used in the core internal structure of nuclear reactor from its high corrosion resistance and moderate fracture toughness. But the fracture toughness decreases by the neutron irradiation. The fracture toughness of irradiated stainless steel is highly uncertain and due to the lack of experimental results and the dispersion caused by the difference of experimental conditions. To perform a reliable structural integrity evaluation, the stochastic method considering the uncertainty in the strength of irradiated stainless steels are strongly demanded. In this study, we proposed an evaluation method of the variability of fracture parameters, in which the uncertain stress strain relationship is obtained from the Monte Carlo calculation using the constitutive equation of EPRI MRP-135. We demonstrated the finite element elastic-plastic analysis using the obtained 20 dispersed stress-strain relationships, and discuss the variability of the fracture parameters.

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