JAERI contribution for the IAEA coordinated research program phase III (CRP-3) on 'optimizing of reactor pressure vessel surveillance programmes and their analysis'

摘要

As a part of IAEA coordinated research program on irradiation embrittlement of RPV steels, JAERI performed irradiation study using seven materials with varying copper and nickel contents. Irradiation of test specimens was conducted in JMTR of JAERI/Oarai and post irradiation tests including fracture toughness were done at hot laboratory at JAERI/Tokai. The following conclusions were drawn: (1) With increasing Ni contents from 0.1 to 1.18 wt%, radiation hardening and therefore embrittlement became larger. (2) The increase of yield stress can be correlated with hardness increase and Charpy transition temperature shift. (3) In the upper shelf region, irradiation response on fracture toughness was well correlated with radiation hardening, while no good correlation was found between Charpy energy decrease and radiation hardening. (author).