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Reliability analysis of safety grade decay heat removal system of Indian prototype fast breeder reactor
Indira Gandhi Centre for Atomic Research, Kalpakkam, India.
AERB-Safety Research Institute, IGCAR Campus, Kalpakkam, India.
Indira Gandhi Centre for Atomic Research, Kalpakkam, India .
Atomic Energy Regulatory Board, Niyamak Bhavan, Anushaktinagar, Mumbai, India .
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2006 (English)In: Annals of Nuclear Energy, ISSN 0306-4549, Vol. 33, no 2, p. 180-188Article in journal (Refereed) Published
Abstract [en]

The 500MW Indian pool type Prototype Fast Breeder Reactor (PFBR), is provided with two independent and diverse Decay Heat Removal (DHR) systems viz., Operating Grade Decay Heat Removal System (OGDHRS) and Safety Grade Decay Heat Removal System (SGDHRS). OGDHRS utilizes the secondary sodium loops and Steam–Water System with special decay heat removal condensers for DHR function. The unreliability of this system is of the order of 0.1–0.01. The safety requirements of the present generation of fast reactors are very high, and specifically for DHR function the failure frequency should be less than 1E-7/ry. Therefore, a passive SGDHR system using four completely independent thermo-siphon loops in natural convection mode is provided to ensure adequate core cooling for all Design Basis Events. The very high reliability requirement for DHR function is achieved mainly with the help of SGDHRS. This paper presents the reliability analysis of SGDHR system. Analysis is performed by Fault Tree method using "CRAFT" software developed at Indira Gandhi Centre for Atomic Research. This software has special features for compact representation and CCF analysis of high redundancy safety systems encountered in nuclear reactors. Common Cause Failures (CCF) are evaluated by beta-factor method. The reliability target for SGDHRS arrived from DHR reliability requirement and the ultimate number of demands per year (7/y) on SGDHRS is that the failure frequency should be <=1.4E-8/de. Since it is found from the analysis that the unreliability of SGDHRS with identical loops is 5.2E-6/de and dominated by leak rates of components like AHX, DHX and sodium dump and isolation valves, options with diversity measures in important components were studied. The failure probability of SGDHRS for a design consisting of 2 types of diverse loops (Diverse AHX, DHX and sodium dump and isolation valves) is 2.1E-8/de, which practically meets the reliability requirement.

Place, publisher, year, edition, pages
2006. Vol. 33, no 2, p. 180-188
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-9330DOI: 10.1016/j.anucene.2005.08.001ISI: 000234877500008Scopus ID: 2-s2.0-28844434240OAI: oai:DiVA.org:mdh-9330DiVA, id: diva2:301906
Available from: 2010-03-03 Created: 2010-03-03 Last updated: 2015-07-08Bibliographically approved

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Chandran, Senthil Kumar
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