リスクを活用した合理的な圧力容器保全のための研究
英字タイトル:
Risk-based Optimization of Reactor Pressure Vessel Maintenance
著者:
中筋 俊樹 Toshiki NAKASUJI 阮 小勇 Xiaoyong RUAN 森下 和功 Kazunori MORISHITA
発刊日:
公開日:
Bayesian statisticsIrradiation EmbrittlementReactor Pressure VesselRisk Assessment
Risk-based Optimization of Reactor Pressure Vessel Maintenance
著者:
中筋 俊樹 Toshiki NAKASUJI 阮 小勇 Xiaoyong RUAN 森下 和功 Kazunori MORISHITA
発刊日:
公開日:
カテゴリ: 第14回
キーワードタグ:Bayesian statisticsIrradiation 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 new method was developed to assess a failure risk of RPV at PTS event 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 was discussed.
