Functional reliability analysis of Safety Grade Decay Heat Removal System of Indian 500 MWe PFBR |
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| Authors: | T. Sajith Mathews [Author Vitae] U. Parthasarathy C. Senthil Kumar |
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| Affiliation: | a AERB-Safety Research Institute, Kalpakkam 603102, India
b Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India |
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| Abstract: | Passive systems are increasingly deployed in nuclear industry with an objective of increasing reliability and safety of operations with reduced cost. Methods for assessing the reliability of thermal-hydraulic passive systems, that is systems with moving working fluid, address the issues in natural buoyancy-driven flow that could result in a failure to meet the design safety limits under accident scenarios. This is referred as design functional reliability. This paper presents the results of functional reliability analysis carried out for the passive Safety Grade Decay Heat Removal System (SGDHRS) of Indian Prototype Fast Breeder Reactor (PFBR). The analysis is carried out based on the overall approach reported in the Reliability Methods for Passive System (RMPS, European Commission) project. Functional failure probability is calculated using Monte-Carlo method and also with method of moments. |
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| Keywords: | AERB, atomic energy regulatory board AHX, sodium to air heat exchanger CEA, french atomic energy commission CSACHST, central sub-assembly clad hot spot temperature DBE, design basis event DHX, primary to secondary sodium heat exchanger DSL, design safety limit ENEA, Italian National Agency for New Technologies, Energy and the Environment FHT, flow halving time HPT, hot pool temperature IAEA, International Atomic Energy Agency IGCAR, Indira Gandhi Centre for Atomic Research IHX, intermediate heat exchanger LWR, light water reactor NC, natural circulation PDF, probability density function PFBR, Prototype Fast Breeder Reactor PSP, primary sodium pump R2, coefficient of determination RMPS, reliability Methods For Passive System RP, reactor power SGDHRS, Safety Grade Decay Heat Removal System SSACHST, storage sub-assembly clad hot spot temperature SSP, secondary sodium pump T-H, thermal-hydraulic |
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