摘要
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.
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.
关键词
压水堆
全场断电
严重事故
热管段
自然循环
Severe accident, TMLB＇ accident, Natural circulation, Hot leg countercurrent flow
