Abstract
The dynamic fracture toughness is a most critical parameter for the safety assessment of reactor pressure vessels. However, linear elastic fracture toughness test to obtain the dynamic fracture toughness is very difficult because large specimens are required for the test. A small specimen fracture toughness test is needed strongly since such a specimen test has several advantages. In the present study, the dynamic fracture toughness of 12 heats of RPV steels were measured and the correlation between the dynamic fracture toughness and other small specimen test results was discussed. A method to predict the dynamic fracture toughness corresponding to a large specimen using Charpy V notch test results is developed based on the authors' current research.
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