SDG故障诊断方法在核动力装置中的应用研究

核动力装置运行状态的诊断关系到装置运行的安全性和可靠性。针对核动力装置系统复杂，难以建立数学模型的特点，本文将基于定性模型的符号有向图（SDG）方法应用于核动力装置中进行故障诊断，并以核动力装置主冷却剂系统为研究对象，提出了相应的建模方法并建立了SDG模型，根据所建立的模型开发了基于SDG方法的核动力装置故障诊断系统，并以蒸汽发生器传热管破裂（SGTR）事故和弹棒事故为例对该系统的诊断推理过程进行了分析。仿真结果表明，基于SDG的方法在核动力装置中能有效诊断故障，并能提供故障传播路径，具有良好的解释性，可为运行人员决策提供帮助。

Research on Fault Diagnosis With SDG Method for Nuclear Power Plant

The diagnosis of the operational state of a nuclear power plant (NPP) plays an important role for the safety and reliability of NPP operation. In this paper, the qualitative method for fault diagnosis based on signed directed graph (SDG) was applied in a complex NPP system because the mathematical model of NPP is difficult to be built. The reactor coolant system (RCS) was taken as the diagnostic object, and the approach of building SDG model was presented and the SDG model of the RCS was built. Based on the SDG model, a fault diagnosis system of RCS was developed, and the steam generator tube rupture (SGTR) and rod ejection accidents were taken as example to analyze the process of diagnosis inference. The simulation results show that the method based on SDG can effectively diagnose the fault in RCS, and it can also provide good explanation for the fault propagation paths. Therefore, this method can help operators to make correct decisions.