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Verifying Diversity Defense Mechanisms against Common Cause Failures for Safety Instrumented Systems Using a Stress-Strength Model

机译:使用应力 - 强度模型来验证防止常见原因防止普通原因的失败机制

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Common cause failure (CCF) is a serious threat to Safety Instrumented Systems (SIS) reliability. It is therefore important to model and quantify CCF in reliability analysis. Diversity has long been used to protect redundant systems against CCF. Whilst there is clear evidence that diversity can bring benefits when compared with identical redundancy systems, these benefits can be difficult to quantify. Therefore, a novel CCF model which studies CCF from the viewpoint of Root Cause (RC) and Coupling Factor is proposed in this paper. The key parameters of the novel CCF model can be determined based on a stress-strength model by classifying variables of stressors and strengths according to RC categories. An application example is provided that illustrates how the proposed CCF model performs for a chemical reactor safety system (CRSS) for protection against high pressure and temperature. The results not only confirm that diversity techniques lower the CCF probability but also provide quantitative assessment of how large the improvements can be in different diversity techniques.
机译:常见的原因失败(CCF)是对安全仪器系统(SIS)可靠性的严重威胁。因此,在可靠性分析中模拟和量化CCF是重要的。多元化长期以来一直用于保护冗余系统免受CCF。虽然有明确的证据表明,与相同的冗余系统相比,多样性会带来益处,但这些益处可能难以量化。因此,本文提出了一种从根本原因(RC)和耦合因子的观点来研究CCF的新型CCF模型。通过根据RC类别对压力源和强度的分类来基于应力 - 强度模型来确定新型CCF模型的关键参数。提供了一种应用示例,其说明了所提出的CCF模型如何为化学反应器安全系统(CRS)进行用于保护,以防止高压和温度。结果不仅证实了多样性技术降低了CCF概率,而且还提供了对不同多样性技术的大量的定量评估。

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