核级蝶阀的模糊故障树分析

Fuzzy fault tree analysis of nuclear-class butterfly valve

为提高核级蝶阀的可靠性,引进模糊故障树的分析方法.建立核级蝶阀失效故障树,得到其最小割集,确定核级蝶阀在设计和运行阶段的薄弱环节,以采取提高可靠性的措施.提出可引用模糊故障树计算方法,对所建故障树进行定量计算,为核级蝶阀的合理维护提供参考依据.以密封圈损坏为例,得到密封圈损坏的概率为[0.005,0.024 9].

To improve the reliability of the nuclear-class butterfly valve,an analysis method of fuzzy fault tree was introduced.On the basis of the basic theory and procedure of fuzzy fault tree analysis,a failure fault tree of nuclear-class valve was established,the minimum cut set was obtained,and the weak links of nuclear-class valve during its design and operation period was determined,so that the measures could be taken to improve reliability.Besides,a calculation method based on the fuzzy fault tree was proposed for its quantitative evaluation,providing thus a reference for nuclear-class butterfly valve maintenance.A damaged sealing ring was taken to as an example obtain the probability being between 0.005 and 0.024 9.