高温气冷堆压力容器侧向支承地震易损性的敏感性分析

Sensitivity Analysis for Seismic Fragilities of Lateral Supports of RPV for High Temperature Gas-Cooled Reactor

反应堆压力容器(RPV)侧向支承是高温气冷堆地震风险的关键贡献物项,对于反应堆地震安全至关重要。本文确定了高温气冷堆RPV侧向支承的地震易损性变量,分析出易损性变量因子的合理取值,计算得到侧向支承的地震易损性曲线和高置信度低失效概率(HCLPF)抗震能力,挑选出易损性变量中的关键参数,并研究了RPV侧向支承HCLPF抗震能力对易损性关键参数的敏感性。结果表明,侧向支承的抗震能力明显高于设计基准地震动,易损性对于关键参数变异并不敏感。

The lateral supports of reactor pressure vessel (RPV)are expected as a major contributor to the seismic risk of high temperature gas-cooled reactor (HTR)and are crucial to the safety of HTR RPV under seismic events.In this paper,we focus on the identification of seismic fragility variables,the analysis of reasonable factor values of fragility variables,the calculation of High Confidence Low Probabilistic Failure (HCLPF)Capacity and seismic fragility Curves,the selection of the key parameters among fragility variables,and the exploration into the sensitivity of HCLPF to these key parameters of seismic fragility analysis.The results show that the HCLPF of lateral supports is much higher than the design basis earthquake level and that it is insensitive to the variability of the key parameters.