核电厂非能动余热排出系统的失效概率评价  

Failure Probability Assessment of Passive Residual Heat Removal System for NPPs

作　　者：汤华鹏[1] 张知竹[1] 李海博[1] 张凯[1] 邓纯锐 冉旭[1] 

机构地区：[1]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213

出　　处：《核动力工程》2017年第6期66-71,共6页Nuclear Power Engineering

摘　　要：先进核电厂设计中大量采用非能动安全系统提高反应堆安全性。但目前尚无系统性评价非能动系统的成熟方法,而且概率安全评价(PSA)也未考虑非能动系统自然循环现象不确定性导致的功能失效。在欧盟非能动系统可靠性评价研究项目(RMPS)研究成果的基础上,以压水堆二次侧非能动余热排出系统(PRS)为研究对象,基于统计学和热工水力计算确定了影响性能的参数重要度,进而利用蒙特卡罗抽样和响应面分析对全厂断电事故下的PRS自然循环失效概率进行了量化分析评价。初步评价结果表明:非能动系统功能失效概率为2.14×10-3,在PSA中应当充分考虑各种非能动系统的功能失效。本文的评价方法还可以为非能动安全系统设计优化提供支持。Passive safety systems are increasingly implemented in the design of advanced nuclear power plants, in order to improve the safety of reactors. Up to now, no systematic and mature methodology has been presented addressing the evaluation for passive thermal-hydraulic systems. Also its failure probability is generally not considered in PSA. This paper presents the quantification result of failure probability about natural circulation functional carried out for the Passive Residual Heat Removal System of Secondary Side （PRS） of PWR. The analysis took overall approach reported in the Reliability Methods for Passive System （RMPS, European Commission） project as reference. The importance indicators of parameters affecting its performances have been evaluated based on statistics methodology and T-H simulation. At last, natural circulation functional failure probability is calculated using Monte-Carlo method and also with Response Surface method. The assessment shows the functional failure probability of PRS is 2.14×10-3. The method adopted in this paper can be used in Passive safety systems design optimization.

关 键 词：非能动 概率安全评价 失效概率 自然循环 

分 类 号：TL329[核科学技术—核技术及应用]