数字化安全级DCS紧急停堆系统共因失效分析  

Common Cause Failure of Digital Safety Level DCS Emergency Shutdown System

作　　者：马权[1] 罗琦[1] 宋小明[1] 刘艳阳[1] Ma Quan;Luo Qi;Song Xiaoming;Liu Yanyang(Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China)

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》2018年第3期95-99,共5页Nuclear Power Engineering

摘　　要：以2oo3架构数字化安全级分布式控制系统(DCS)紧急停堆系统为研究对象,采用Markov方法对其建立可靠性模型,分别计算并对比了考虑共因失效和不考虑共因失效2种情况下紧急停堆系统的拒动概率,同时对系统拒动概率相对于共因失效因子变化的敏感性进行了重点分析。结果表明,拒动概率随着共因失效因子的增加而变大,因此,在系统设计中需采取有效措施对冗余系统的共因失效进行控制,降低共因失效因子,从而提高紧急停堆系统的可靠性。This paper takes the digital safety level DCS emergency shutdown system which used 2-out-of-3 architecture as the research object, and establishes the reliability model of the system by the method of Markov. The average probability of failure on demand, as so called the PFDavg, under two cases of common cause failure and non common cause failure consideration are calculated and compared. In addition, it turns out that the PFDavg changes to be bigger with the increasing of the factor of common cause failure. Thus, in order to decrease the factor of common cause failure, it is necessary to control the common cause failure by some effective measures when designing the system to improve the reliability of RTS.

关 键 词：数字化安全级分布式控制系统(DCS) 紧急停堆系统 2oo3架构 共因失效 

分 类 号：TL362[核科学技术—核技术及应用]