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In structural integrity assessment for nuclear reactor technology, one of the most important subject is to develop an estimation procedure of the cleavage controlled fracture toughness KIC from standard Charpy V surveillance test data for neutron-irradiated pressure vessel steels.This paper proposes an empirical representation of KIC fracture toughness transition curve for both unirradiated and irradiated A533B steels. The fitting curves derived are written in forms such as, where KIC(Cv) and KId(Cv) mean the plane strain fracture toughness parameters characterizing an onset of the cleavage instability under static and dynamic loading conditions respectively, Cv is a value of standard Charpy V absorbed energy at a test temperature concerned and Cv-us is a upper shelf energy for the unirradiated steel.It is here demonstrated that the estimated values of KIC(Cv) and KId(Cv) show a good agreement with valid KIC and KId determined experimentally for both unirradiated and irradiated steels.

Evaluation of Plane Strain Fracture Toughness of Neutron-Irradiated A533B Steels in Nuclear Reactor Vessel Surveillance Test