大亚湾核电站全厂断电诱发的严重事故过程研究

在大亚湾核电站严重事故计算分析结果的基础上,对全厂断电诱发的典型的严重事故序列及缓解对策进行了分析。结果表明,全厂断电事故发生后,大约1～2h堆芯上部会裸露,压力容器在5～7h后失效。在约100h安全壳超压失效,而堆坑地基在事故后8.7d会被熔蚀5.5m。结果还表明,堆坑注水措施可以防止堆坑地基熔穿并且减少事故中由于堆芯熔融物与混凝土反应产生的氢气。

Study of Station Blackout Caused Severe Accident Process in Daya Bay Nuclear Power Station

Based on the severe accident calculation results of Daya Bay Nuclear Power Station,this paper analyzes a certain of accident sequence and the mitigating measures of severe accident.The results show that the top of core will be uncovered about 1~2 hours later,and the reactor pressure vessel will fail after 5~7 hours.The containment will fail after about 100 hours.The cavity basement can be penetrated about 5.5m after 8.7 days.The results also show that the pit flooding can prevent the melt-through of the basement and reduce hydrogen mass from interaction of molten corium with concrete.