核电厂DCS网络节点故障下的信号风险研究

Research of Signal Risk under DCS Net-Node Failure in Nuclear Power Plant

核电厂单一网络节点故障后,保守决策还必须叠加考虑其他位置网络节点故障并进行包络性风险分析。基于某核电厂数字化控制系统(DCS)网络结构和控制逻辑数据建模分析,首先计算生成所有DCS网络信号风险数据,给出网络信号物理路径计算方法和信号冗余判断规则,通过构建单一节点故障下的状态转移矩阵计算剩余网络节点故障概率,进行单一或叠加故障下的网络信号风险分析评估,最后针对识别出的高风险网络信号给出风险控制及改进建议。此模型和分析方法已于计算机实现,能快速识别假冗余、布置不合理等设计缺陷,能快速分析单一或叠加故障下受影响的信号和风险并显性化输出。可指导核电厂相关维修作业,或为DCS组态设计、功能优化提供参考输入。

After a single net-node failure in the nuclear power plant,the conservative decision must also consider the net node failure at other locations and make an enveloping risk analysis.Based on the modeling and analysis of Distributed Control System(DCS) network structure and control logic data of a nuclear power plant,the calculation method of the physical path of network signals and the judgment rules of signal redundancy are given,the failure probability of the remaining network nodes is calculated by constructing the state transition matrix under single node failure,the network signal risk analysis and evaluation under single or superimposed failure are carried out,and finally the risk control and improvement suggestions are given for the identified high-risk network signals.This model and analysis method have been realized by computer software,which can quickly identify design defects such as false redundancy and unreasonable layout,and can quickly analyze the affected signals and risks under single or superimposed faults and output them explicitly.This study can provide guidance for related maintenance operations of nuclear power plants,or provide reference input for DCS configuration design or function optimization.