An extension of Multiple Greek Letter method for common cause failures modelling |
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| Institution: | 1. The Israel Electric Corporation Ltd., P. O. Box 10, Bait Amir, Haifa 3100, Israel;2. Center for Reliability and Risk Management, Industrial Engineering and Management Department, SCE – Shamoon College of Engineering, Beer-Sheva, Israel;1. Center for Computational Science and e-Systems, Japan Atomic Energy Agency, 178-4-4, Wakashiba, Kashiwa, Chiba 277-0871, Japan;2. Technology Center, Taisei Corporation, 344-1 Nase-cho, Totsuka-ku, Yokohama 245-0051, Japan;3. Department of Nuclear Safety Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Setagaya-ku, Tokyo 158-8557, Japan;4. Department of Architecture, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;1. School of Energy Systems Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, South Korea;2. Integrated Safety Assessment Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero, Yuseong-gu, Daejeon, 34057, South Korea;1. Department of Conversion and Fusion System Engineering, Major in Plant System Engineering, Kyungpook National University, South Korea;2. Structural Safety & Prognosis Research Division, Korea Atomic Energy Research Institute, South Korea;3. School of Civil Engineering, Chungbuk National University, South Korea;4. Department of Civil and Environmental Engineering, Hanbat National University, South Korea |
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| Abstract: | Common cause failure describes a condition where several components share the same source of failure that causes them to fail or become unavailable simultaneously. The objective of this paper is to present an improved approach to common cause failure modelling within reliability analyses. The currently used methods allow one component to share common characteristics with only one group of components, which may be affected by the same source of failure. Therefore, an improved method was developed, where components can be assigned to several groups of components that are susceptible to faulty operation with respect to their similar characteristics. A mathematical derivation of the method is presented and the theory is applied to smaller theoretical samples and to a simplified real example. The results show that the new method enables a more detailed reliability analysis. The results prove that consideration of common cause failures using the improved method may decrease the system reliability compared to traditional common cause failure consideration. The system reliability decreases more, if the redundant components have more similarities and are therefore assigned to several common cause failure groups. |
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| Keywords: | Reliability Common cause failures Multiple Greek Letter method Safety injection system |
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