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N中取M系统是反应堆保护系统中的冗余设计。通过分析系统拒动率、误动率两个量化指标,得到严格数学公式,并做了近似计算。基于公式,系统解释了工程实际中N中取M多为4取2或3取2的基本原理。以非安全故障概率0.1、安全故障概率0.1为例,比较不同取值的判决系统。依据系统拒动率A、误动率B,单一模块拒动率P、误动率Q,即输入设计参数(A,B,P,Q),计算得到N和M的取值。
The N-take-M system is a redundant design in the reactor protection system. Through analyzing two quantitative indexes, such as rejection rate and misoperation rate of the system, the strict mathematical formula is obtained and the approximate calculation is made. Based on the formula, the system explains the basic principle of taking M as 4, taking 2 or 3 as 2 in N in engineering practice. Taking the probability of non-safety fault 0.1 and the probability of safety fault 0.1 as an example, the decision system of different values is compared. The values of N and M are calculated according to the system rejection rate A, the misoperation rate B, the rejection rate P of a single module, and the misoperation rate Q, that is, the input design parameters (A, B, P, Q).