Effect of Logic Degradation on Reliability of Digital Reactor Protection System
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摘要: 主要论述数字化核反应堆保护系统(RPR)取代模拟RPR的优点,以及数字化系统符合逻辑退化对系统可靠性的影响。依据当前核电厂通用的4通道保护系统的架构和传统的可靠性框图(RBD)方法,建立2种系统可靠性模型,并对不同的逻辑退化方案进行讨论,结果表明:数字化系统优于模拟系统;数字化系统的逻辑退化在满足可靠度变小、诊断覆盖率很大时会降低系统的风险;诊断覆盖率对系统可靠性的贡献很大。同时本文提供了一种获得全系统或全厂的概率安全分析(PSA)所需基础数据的方法。Abstract: The paper primarily discussed the advantages of the digital reactor protection systems（RPR） compared to the analog system and the effect of the voting logic degradation on the system reliability.Based on the current common four-channel reactor protection system and the traditional reliability block diagrams（RBD） technology,two system reliability models were established and different logic degradation cases were discussed.The results showed that,the digital system is better than analog systems,which logic degradation can reduce the system risk when the reliability of system is weakened and the diagnostic coverage（DC） is large.DC contributes greatly to the system reliability.This paper also provided a method to obtain the basic data for PSA of whole system or plant.
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Key words:
- RPR /
- PSA /
- RBD /
- Voting logic degradation
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