Comparison of Markov model and fault tree approach in determining initiating event frequency for systems with two train configurations |
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Authors: | Leiming Xing Karl N Fleming Wee Tee Loh |
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Affiliation: | aPLG, Inc., 4590 MacArthur Blvd., Ste. 400, California 92660, Newport Beach, USA;bERIN Engineering and Research, Inc., 2121 Palomar Airport Road, Ste. 105, California 92009, Carlsbad, USA |
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Abstract: | This study explores the use of Markov models in some areas of systems analysis in which time evolution of the system may be a significant factor in influencing the system reliability or availability. Comparisons are made between the Markov models and the time-averaged fault tree models for determining support system failure initiating event frequency in a nuclear power plant, for both power and shutdown conditions. Factors affecting consistency between the fault tree approach and the Markov model approach are studied for systems with common two train configurations. A correlation is developed to estimate the ratio between initiator frequencies through both approaches for a two parallel component system. Insights are developed as to when time averaged and simplified fault tree models support a good approximation to the more rigorous time-dependent Markov models. |
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