反应堆冗余泵组的相关动态可靠性

Dependent dynamic reliability of redundancy pump group in nuclear reactor

为了解决反应堆冗余泵组中相关性(包括泵的温备用、共因失效以及止回阀组同时工作)相互重叠的问题,应用动态可靠性框图(DRBD)建立了冗余泵组的相关动态模型.以冗余泵组为整体,比较分析了其在4种不同相关性情况下的系统故障概率变化,通过状态转移方程求得动态数值解并绘制了曲线图.实验结果表明,多种相关性重叠在冗余泵组中起着重要作用,以DRBD建模为基础,确定并量化各相关因子之间的关系是分析冗余系统相关性的一种有效方法.

For solving the problem that the dependency overlap of redundancy pump group in nuclear reactor,including warm standby and common cause failure（CCF） of pumps as well as simultaneous operating of check valve group,the dynamic reliability block diagram（DRBD） was used to establish the dependent dynamic model of redundancy pump group.With taking the redundancy pump group as a whole,the failure probability changes of redundancy pump group in four different dependencies were analyzed and compared.The dynamic numerical solution and corresponding curves were obtained by state-transferring equation.The experiment results show that the dependency overlap is very important in redundancy pump group.It is an effective method to analyze the dependency of redundancy system by determining and quantifying the relations between various dependency factors based on DRBD modeling.