Passive system reliability analysis using Response Conditioning Method with an application to failure frequency estimation of Decay Heat Removal of PFBR |
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Authors: | T. Sajith Mathews A. John Arul C. Senthil Kumar P. Mohanakrishnan |
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Affiliation: | a AERB-Safety Research Institute, Kalpakkam 603102, Tamilnadu, India b Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamilnadu, India |
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Abstract: | Innovative nuclear reactor designs include passive means to achieve high reliability in accomplishing safety functions. Functional reliability analyses of passive systems include Monte Carlo sampling of system uncertainties, followed by propagation through mechanistic system models. For complex passive safety systems of high reliability, Monte Carlo simulations using mechanistic codes are computationally expensive and often become prohibitive. Passive system reliability analysis using recently proposed Response Conditioning Method, which incorporates the insights obtained from approximate solutions like response surfaces in simulations to obtain computationally efficient and consistent probability estimates, is presented in this paper. The method is applied to evaluate the reliability of passive Decay Heat Removal (DHR) system of Indian Prototype Fast Breeder Reactor (PFBR). The accuracy as well as efficiency of the method is compared with direct Monte Carlo simulation. The variability of the reliability values is estimated using bootstrap technique. The system abilities, to prevent critical structural damage as well as to ensure operational safety, are quantitatively ascertained. The system functional failure probabilities are integrated with hardware failure probabilities and the inclusion of passive system unreliability in Probabilistic Safety Assessment is demonstrated. |
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Keywords: | CP, Control Plug CPT, Cold Pool Temperature CSACHST, Central Sub Assembly Clad Hot Spot Temperature DHR, Decay Heat Removal DHX, Decay Heat Exchanger DSL, Design Safety Limit GP, Grid Plate HPT, Hot Pool Temperature IHX, Intermediate Heat Exchanger LOP, Loss of Offsite Power MCS, Monte Carlo Simulation NC, Natural Circulation OGDHRS, Operational Grade Decay Heat Removal System PFBR, Prototype Fast Breeder Reactor PSP, Primary Sodium Pump RCM, Response Conditioning Method SGDHRS, Safety Grade Decay Heat Removal System SS, Subset Simulation SSACHST, Storage Sub Assembly Clad Hot Spot Temperature SWS, Steam Water System |
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