考虑自诊断的反应堆保护系统停堆功能可靠度评估模型研究

“在线自诊断”作为数字化仪控系统的重要特征，对核电厂反应堆保护系统（RPS）停堆功能的可靠性分析具有重要作用。通过分析自诊断对人因、定期试验等因素的影响，建立设备级误动模型；以典型RPS TX为例，通过马尔科夫方法建立动态的TX序列级和系统级模块误动模型；利用系统级模块误动模型定量计算TX停堆功能可靠度与自诊断的关系。通过定性分析与定量计算论证了综合考虑自诊断对RPS停堆功能可靠性分析的必要性，为后续国内RPS停堆功能的可靠性评价提供了借鉴。

Study on Reliability Evaluation Model for the Reactor Protection System Shutdown Function Considering Self-diagnostics

As an important feature of digital instrument control system, online self-diagnostics plays an important role in the reliability analysis of shutdown function of reactor protection system (RPS) in nuclear power plant. By analyzing the influence of self-diagnostics on human factors and periodic testing, the component-level spurious actuation model was established. Taking a typical RPS TX as an example, the dynamic TX sequence-level and system-level module spurious actuation models are established by Markov method. The relationship between TX shutdown function reliability and self-diagnostics is quantitatively calculated by using the system-level module spurious actuation model. Through qualitative analysis and quantitative calculation, the necessity of comprehensive consideration of self-diagnostics in RPS shutdown function reliability analysis is demonstrated, which provides a reference for the subsequent reliability evaluation of RPS shutdown function in China.