专家系统有着广泛的应用领域和应用方式。为增强核电站系统的安全性，协助操作员在故障发生时进行分析决策，建立了基于动态不确定因果图(DUCG)理论的核电站故障诊断专家系统。文章详细介绍了这一系统，重点介绍了系统知识库、推理机和图形化用户界面的设计与功能实现过程。验证结果表明，这一系统能进行准确的故障诊断，显示故障的发展过程，为操作员决策提供支持。%Expert systems are rapidly growing in diversity of application and usage worldwide.To enhance the security of nuclear power plant systems and help the opera-tor for analysis and decision-making in the event of a failure,a nuclear power plant fault diagnosis expert system based on dynamic uncertain causality graph (DUCG)was built. Design and function implementation of the system knowledge base,inference engine and graphical user interface were introduced in detail in this paper.This system is proved to be capable of accurate fault diagnosis based on the verification results and provide sup-port for the operator decisions.
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