In application of the Master Curve (MC) method to the surveillance program of the BWR plants in Japan, we need to address two issues. The first one is to confirm the validity of the MC method to the steels typical to the Japanese reactor pressure vessels (RPVs), and the second is to find a procedure, which allows us to smoothly switch from the current Charpy-based surveillance program to the MC-based surveillance program. In this study, we present results to address the two different issues mentioned above. First, we study the application of the ASTM E 1921 procedure to determine the To values and the MCs for the unirradiated model steels for the Japanese BWR plants. We investigate the basic aspects of the MC method. Second, we investigate the applicability of instrumented Charpy impact data to estimate static fracture toughness Jc values.

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