Reliability analysis of shutdown system |
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| Affiliation: | 1. Aerb-Safety Research Institute, IGCAR Campus, Kalpakkam 603102, India;2. Indira Gandhi Centre For Atomic Research, Kalpakkam 603102, India;3. Atomic Energy Regulatory Board, Niyamak Bhavan, Anushaktinagar, Mumbai 400094, India;4. Industrial Engineering Division, Anna University, Chennai 60025, India;1. Materials Development and Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India;2. Physical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India;3. Department of Mechanical Engineering, Nagaoka University of Technology, 9402188, Japan;1. Japan Atomic Energy Agency, 4002 Narita, O-arai, Ibaraki 311-1393, Japan;2. Mitsubishi FBR Systems, Inc., 2-34-17, Jingumae Shibuya-ku, Tokyo 150-0001, Japan;3. TEPCO SYSTEMS CORPORATION, 2-37-28, Eitai Koto-ku, Tokyo 135-0034, Japan;4. Mitsubishi Heavy Industries, Ltd., 5-717-1 Fukahori, Nagasaki, Nagasaki 851-0392, Japan;1. KEPCO Engineering & Construction Company, Inc., Yuseong-gu, Daejeon 305-353, Korea;2. Chungnam National University Yuseong-gu, Daejeon 305-764, Korea |
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| Abstract: | This paper presents the results of reliability analysis of Shutdown System (SDS) of Indian Prototype Fast Breeder Reactor. Reliability analysis carried out using Fault Tree Analysis predicts a value of 3.5 × 10−8/de for failure of shutdown function in case of global faults and 4.4 × 10−8/de for local faults. Based on 20 de/y, the frequency of shutdown function failure is 0.7 × 10−6/ry, which meets the reliability target, set by the Indian Atomic Energy Regulatory Board. The reliability is limited by Common Cause Failure (CCF) of actuation part of SDS and to a lesser extent CCF of electronic components. The failure frequency of individual systems is <1 × 10−3/ry, which also meets the safety criteria. Uncertainty analysis indicates a maximum error factor of 5 for the top event unavailability. |
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