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首页> 外文会议>Reliability and Maintainability Symposium (RAMS), 2012 Proceedings - Annual >Limitations of explicit modeling of common cause failures within fault trees
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Limitations of explicit modeling of common cause failures within fault trees

机译：故障树内常见原因故障的显式建模的局限性

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摘要

The significant impact that common cause failures can have on reliability and safety of a system comprising redundant components is widely acknowledged. These common cause failures can significantly endanger the benefits of the redundancy which is seen as the main principle upon which safety systems design is based. Thus, consideration of common cause failures is one of the most challenging and critical issues in the probabilistic safety assessment (PSA). This is especially emphasized within PSA fault tree modeling of safety systems within nuclear power plants. This study presents a new method for explicit modeling of single component failure in different common cause component groups (CCCGs) as well as the associated limitations. These limitations arise from the principle of explicit modeling of common cause failures where each components failure space can be decomposed, in terms of causes, to independent portion and dependent, common cause failure affected portion. A method-complementary approach for acting upon these limitations, presented in terms of constraining the dependent portion of the total components failure space, is proposed within the paper. The method is applied on a selected case study system. The results and insights gained out of this application are presented and discussed. In general, the application of this method implicates improved and more detailed PSA models. These improved models consequently direct more realistic PSA results.
机译：众所周知，常见原因故障可能会对包含冗余组件的系统的可靠性和安全性产生重大影响。这些常见原因故障会严重危害冗余的好处，而冗余被视为安全系统设计所基于的主要原则。因此，考虑共因故障是概率安全评估（PSA）中最具挑战性和关键性的问题之一。在核电厂安全系统的PSA故障树建模中，尤其要强调这一点。这项研究提出了一种新的方法，用于在不同的常见原因组件组（CCCG）中对单个组件故障进行显式建模以及相关的限制。这些限制源于对常见原因故障进行显式建模的原理，其中，每个组件故障空间都可以根据原因分解为独立的部分和相关的，常见原因故障影响的部分。在本文中，提出了一种针对这些限制的方法补充方法，以限制总组件故障空间的相关部分表示。该方法应用于选定的案例研究系统。介绍并讨论了从该应用程序中获得的结果和见解。通常，此方法的应用涉及改进的和更详细的PSA模型。因此，这些改进的模型可以指导更实际的PSA结果。

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