堆芯补水箱地震易损性分析  

Seismic Fragility Analysis of Core Makeup Tank

作　　者：鄂万江 玉宇[1,2] 王鹏飞 彭礼韬 E Wanjiang;YU Yu;WANG Pengfei;PENG Litao(School of Nuclear Science and Engineering,North China Electric Power University,Beijing 102206,China;Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy,Beijing 102206,China)

机构地区：[1]华北电力大学核科学与工程学院,北京102206 [2]非能动核能安全技术北京市重点实验室,北京102206

出　　处：《原子能科学技术》2020年第1期132-139,共8页Atomic Energy Science and Technology

基　　金：先进小型堆及铅冷快堆关键技术研究资助项目(2018ZD10);核反应堆系统设计技术重点实验室资助项目(HT-KFKT-02-2016003)

摘　　要：本文采用有限元软件ANSYS建立AP1000核电站堆芯补水箱(CMT)三维有限元模型,通过模态分析获得其结构特征,采用时程分析法较为真实地模拟CMT地震下响应。通过地震易损性数学模型,对CMT的各项易损性参数进行分析,获得了其抗震能力中值A_m、随机性标准差β_R以及不确定性标准差β_U,计算出其高置信度低失效概率(HCLPF)值。结果表明:CMT的HCLPF值明显高于设计安全停堆地震强度0.3g,说明其具有较高的抗震能力,且HCLPF值略高于采用确定论方法得到的值。对易损性参量误差敏感性分析发现β_R取值变化对CMT的条件失效概率和HCLPF值影响较小,可简化部分随机性误差的考虑,使得易损性分析更简洁。The three-dimensional finite element model of AP1000 nuclear power plant core makeup tank(CMT) was established by using finite element software ANSYS in this paper. The structural characteristics of CMT were obtained by modal analysis, and the seismic response was simulated by time-history analysis which is more accurate. Through the mathematical model of seismic fragility of equipment, various fragility parameters of CMT were analyzed, and the median ground acceleration capacity A_m, the logarithmic standard deviations of the inherent randomness about the median β_R and the uncertainty in the median value β_U were gained by calculation of CMT fragility parameters. The high confidence and low failure probability(HCLPF) value was calculated. The results show that the HCLPF value of CMT is significantly higher than 0.3g of the safe shutdown earthquake(SSE), which indicates that CMT has high seismic resistance, and the HCLPF value is slightly higher than that obtained by deterministic method. The sensitivity analysis of fragility parameter errors shows that the change of β_R has little influence on the conditional failure probability and HCLPF value of CMT. It can simplify the consideration of some randomness and make the fragility analysis more concise.

关 键 词：堆芯补水箱 地震 易损性 敏感性 

分 类 号：TL364[核科学技术—核技术及应用]