核电站保护系统平均需求失效概率计算方法研究分析  

Average PFD Calculation Method Research and Analysis of Nuclear Power Plant Protection System

作　　者：马志国 刘旭东[1] 夏利民[1] 白玮[1] 孙洪涛[1] 

机构地区：[1]北京广利核系统工程有限公司

出　　处：《自动化博览》2019年第3期62-66,共5页Automation Panorama1

摘　　要：平均需求失效概率(PFDavg)是衡量停堆保护系统可靠性的一个重要指标。对该指标的定量计算可以客观反映停堆保护系统拒绝响应保护指令的概率,即拒动率。本文以典型反应堆保护系统4取2模型为研究对象,提出了一种综合的分层次的可靠性分析方法,即以马尔科夫模型分析控制站层级的PFDavg指标,以故障树模型分析系统级的PFDavg指标,并对示例系统的PFDavg指标进行定量计算,同时将结果与故障树模型计算结果进行对比。从工程应用角度来说,这种综合方法将故障树和马尔科夫两种不同算法的优点相结合,可以更好地保证分析结果的精度。PFDavg is an important index which could evaluate the reliability performance level of reactor protection system(RPS).The quantitative calculation of system PFDavg reflects the probability of refusing to respond the RPS orders. In this paper,the typical 2 oo4 model of RPS is selected as the analysis object and a comprehensive and layered analysis method is proposed.As a result, the Markov-based PFDavg and the fault tree based PFDavg are raised. Both of the two indicators are calculated and the two results are taken a thorough comparison. From the perspective of technical application, the method mentioned in this paper combines the advantages of both fault tree and markov model, and could make the result more accurate.

关 键 词：核电站 保护系统 平均需求失效概率 可靠性 马尔科夫模型 故障树 

分 类 号：TM623[电气工程—电力系统及自动化]