LIU Hua, LI Jun-hong, WEN Jie, YANG Wu-jiao
(School of Electrical Engineering, University of South China, Hengyang 421001, China)
Abstract： The reliability and availability of the reactor protection system (RPS) can be improved by using M out of N judgment system. By analyzing two quantitative indicators, the rate of refusal to operate and mal-operation rate, a strict mathematical formula and an approximate calculation are stated. The differences of a series of judgment systems are discussed on condition that the unsafe failure probability and the security failure probability are both 0.1. Based on given parameters (A,B,P,Q): A is upper limit of the refusal rate for the RPS, B is upper limit of the mal-operation rate, P and Q are basic protection unit rates corresponding to refusal rate and mal-operation rate, respectively. According to these parameters, the values of N and M can be solved.
Key words： reactor protection system (RPS); availability; reliability; M out of N system; quantitative analysis
CLD number： TL361 Document code： A
Article ID： 1674-8042(2014)03-0060-04 doi： 10.3969/j.issn.1674-8042.2014.03.011
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N中取M设计分析及其在反应堆保护系统中的应用
刘华, 李军红, 文杰, 阳武娇
(南华大学 电气工程学院， 湖南 衡阳 421001)
摘要: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。
关键词:反应堆保护系统； 可用性； 可靠性； N取M系统； 量化分析
引用格式：LIU Hua, LI Jun-hong, WEN Jie, et al. Design analysis and its application of M out of N in reactor protection system. Journal of Measurement Science and Instrumentation, 2014, 5(3): 60-63. [doi: 10.3969/j.issn.1674-8042.2014.03.011]
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