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ULOF transient behaviour of metal-fuelled fast breeder reactor coresas a function of core size and perturbation methodsA

A, Riyas and P, Mohanakrishnan (2014) ULOF transient behaviour of metal-fuelled fast breeder reactor coresas a function of core size and perturbation methodsA. Nuclear Engineering and Design, 278. pp. 141-149.

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Abstract

tThe safety behaviour of metal-fuelled fast breeder reactor cores may be assessed by their transientbehaviour during anticipated unprotected transients. Out of such transients, unprotected loss of flowaccident (ULOFA) has been recognized as an event important for determining reactor safety due to thepositive sodium void coefficient of reactivity and the remote possibility of complete power failure asinitiator. Reactor safety under ULOFA condition is particularly based on the inherent feedbacks, which iscalculated using the removal worths and Doppler constants. As the removal worth is a strong functionof reactor size, ULOF analyses are carried out in three different reactor size viz. 120 MWe, 500 MWe and1000 MWe. The study reveals that smaller metal cores are safer than larger cores with respect to theULOF accidents in the pre-disassembly phase. The present study also shows that the use of exact per-turbation based reactivity worths introduce no significant changes in the safety behaviour of metal fuelreactor compared to that with the use of first order perturbation worths in pre-disassembly phase. Thefirst order approximation is found to be valid as the expansion of materials in the core during ULOFA issmall before the core enters the disassembly phase.

Item Type: Article
Subjects: Departments at MU > Manipal Centre for Natural Sciences
Depositing User: MCNS Editor
Date Deposited: 01 Oct 2015 12:00
Last Modified: 01 Oct 2015 12:00
URI: http://eprints.manipal.edu/id/eprint/144263

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