基于GO-FLOW-Markov法的核电站给水系统可靠性分析

Reliability analysis of nuclear power plant feedwater system based on GO-FLOW-Markov method

中文关键词: 核电站给水系统  可靠性分析  GO-FLOW法  Markov  并联备用

英文关键词: nuclear power plant feedwater system  reliability analysis  GO-FLOW methodology  Markov  parallel standby

中文摘要:

      采用GO-FLOW法分析核电站给水系统的可靠性时，存在无法处理系统中并联备用子系统的问题．为此，提出了一种基于GO-FLOW-Markov的可靠性分析方法，通过建立主系统和备用系统的Markov状态转移矩阵来求解系统可靠度，并以该方法为运算规则，提出了一种具有普适性的新操作符备用门，扩展了GO-FLOW法操作符．考虑到系统中存在多组冗余系统，引入α因子建立了具有共因失效的给水系统可靠性分析模型并进行计算．结果表明，GO-FLOW-Markov法可用来计算并联备用系统可靠度，且考虑因素比常规GO-FLOW法更全面；核电站给水系统中的共因失效对系统可靠性有明显的影响，因此对复杂系统应该考虑共因失效问题，其可靠度计算结果更贴合工程实际．

英文摘要:

      When the GO-FLOW methodology is used to analyze the reliability of the nuclear power plant feedwater system, there is a problem that the parallel standby subsystem in the system cannot be handled. Therefore, a reliability analysis method based on GO-FLOW-Markov is proposed to solve the system reliability by establishing the Markov state transfer matrices of the primary and standby systems, and using this method as an arithmetic rule, a new operator with universal applicability, the standby gate, is proposed to extend the GO-FLOW methodology operator. Considering the existence of multiple redundant systems, the reliability analysis model of feedwater system with common cause failure is established and calculated by introducing the α factor. The results show that the GO-FLOW-Markov method can be used to calculate the reliability of parallel standby system, and the factors considered are more comprehensive than the conventional GO-FLOW methodology. The common cause failure of nuclear power plant feedwater system has obvious influence on the system reliability, so the common cause failure problem should be considered for the complex system, and the reliability calculation results are more suitable for the engineering practice.