国内軽水炉プラントにおける原子炉圧力容器の照射脆化への取り組み
Industry Practice for the Neutron Irradiation Embrittlement of Reactor Pressure Vessel Steels in Japan
著者:
山下 理道 Norimichi YAMASHITA 岩崎 正伸 Masanobu IWASAKI 堂崎 浩二 Koji DOZAKI
発刊日:
公開日:
embrittlement correlation methodneutron irradiation embrittlementreactor pressure vessel
概要
Neutron irradiation embrittlement of reactor pressure vessel (RPV) steels is one of the important material ageing issues. The Japan Electric Association Code, JEAC 4201-2007 “Method of Surveillance Tests for Structur al Materials of Nuclear Reactors,” was revised in December 2007. A new mechanism-guided embrittlement correlation method was adopted. The surveillance program was modified for the long term operation of nuclear plan ts by introducing the “long-term surveillance program”, which is to be applied for the operation beyond 40 years. The use of the re-loading, re-irradiation and reconstitution of the tested Charpy/fracture toughness s pecimens is also specified in the new revision. This paper reports the application and practice of the JEAC4201-2007 in terms of the prediction of embrittlement and the use of tested surveillance specimens in Japan.
