基于BDD的安全注射系统共因失效分析方法

摘要

针对用传统的PSA方法分析含有共因失效系统的可靠性时计算量大、耗时长,提出了利用二元决策图(BDD)与共因失效隐式分析相结合的方法对系统可靠性进行计算.建立系统故障树并转化为BDD图得到系统可靠度的不交化表达式,结合共因失效隐式分析,将该式转化成含共因失效的可靠度表达式,并以安全注射系统为例进行可靠度分析计算.结果表明:BDD图与共因失效隐式分析相结合的方法对含有共因失效的复杂系统进行可靠性分析时简便有效,计算结果更符合实际情况.%The traditional PSA method is used to analyze the reliability of the system with common cause failure spend large amount of calculation and time.In this paper,we propose a method of combining binary decision diagram (BDD) with common cause failure(CCF) implicit analysis to calculate the reliability of the system.The system fault tree is established and transformed into the BDD to get the disjoint expression of system reliability,combined with CCF implicit analysis to transform it into a reliability expression with CCF.In this paper,an example is given to analyze the reliability of safety injection system.Results show that it is simple and effective to analyze the reliability of complex systems with CCF by the combination of BDD diagram and CCF implicit analysis,the calculation results are more in line with the actual situation.