圧力容器鋼の照射脆化に伴うリスクの低減に向けて :材料シミュレーションからのアプローチ
英字タイトル:
Reduce the risks associated with irradiation embrittlement of RPV steels: Approach from simulation of microstructural change in steels during irradiation
著者:
中筋 俊樹 Toshiki NAKASUJI 阮 小勇 Xiaoyoug RUAN 森下 和功 Kazunori MORISHITA
発刊日:
公開日:
Irradiation EmbrittlementReactor Pressure VesselRisk Assessment
Reduce the risks associated with irradiation embrittlement of RPV steels: Approach from simulation of microstructural change in steels during irradiation
著者:
中筋 俊樹 Toshiki NAKASUJI 阮 小勇 Xiaoyoug RUAN 森下 和功 Kazunori MORISHITA
発刊日:
公開日:
カテゴリ: 第13回
キーワードタグ:Irradiation EmbrittlementReactor Pressure VesselRisk Assessment
概要
Reactor pressure vessel (RPV) steels are subjected to neutron irradiation that can lead to loss of fracture toughness. One of the critical issues for RPV structural integrity is related to the pressurized thermal shock (PTS) event. Risk assessment is important for safety evaluation and maintenance planning of a nuclear power plant. In this study, a risk assessment method of failure of reactor pressure vessel at PTS event was developed for the risk- based maintenance. The failure risk was caused by fluctuations of stress intensity factor (K1) and fracture toughness (K1C) of cracks at the inner surface of the RPV. The optimization of conventional time-based maintenance of RPV structures was discussed.
