Analysis of hot leg natural circulation under station blackout severe accident

MISCELLANEOUS

Analysis of hot leg natural circulation under station blackout severe accident

DENG Jian，

CAO Xuewu

Nuclear Science and Techniques

Vol.18, No.2

pp.123-128

Published in print 20 Apr 2007

DOI：10.1016/S1001-8042(07)60032-3

CLC：TL364+.4

31400

Under severe accidents, natural circulation flows are important to influence the accident progression and result in a pressurized water reactor (PWR). In a station blackout accident with no recovery of steam generator (SG) auxiliary feedwater (TMLB' severe accident scenario), the hot leg countercurrent natural circulation flow is analyzed by using a severe-accident code, to better understand its potential impacts on the creep-rupture timing among the surge line, the hot leg, and SG tubes. The results show that the natural circulation may delay the failure time of the hot leg. The recirculation ratio and the hot mixing factor are also calculated and discussed.

Severe accidentTMLB' accidentNatural circulationHot leg countercurrent flow

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