近十年来,国际已公认共因失效在核电站风险中占有十分重要的作用,因此共因失效研究已成为并将继续为当前国际概率安全分析的中心课题之一。我们在IAEA研究协作计划“研究堆概率安全分析(PSA)用可靠性数据收集”中,发展了一种称为ξ共因分析模型和防御策略效率计算方法,ξ模型是一种参数式的模型。它是以失效事件为基础,能清晰表达各种失效在多重失效中的作用。由此,提供明确的防止或降低共因失效事件发生概率的防御对策的重点。另外,发展了防御共因失 In the last decade, the international community has recognized that co-factor failure plays a very important role in the risk of nuclear power plants. Therefore, co-factorial failure research has become and will continue to be one of the central topics in current international probabilistic safety analysis. In the IAEA Research Collaboration Program, “Reliability Data Collection for Research Reactor Probabilistic Safety Analysis (PSA),” we developed a method called ξ co-factorial analysis model and defensive strategy for efficiency calculation. The ξ model is a parametric Model. It is based on a failure event that clearly expresses the role of various failures in multiple failures. As a result, it is important to provide a clear defensive countermeasure to prevent or reduce the probability of occurrence of a common cause of failure. In addition, the defense of common cause has been developed