中文摘要：

针对全船断电叠加安全阀失效事故,以严重事故分析程序MELCOR为研究工具,建立了某型船用堆的分析模型,分析了稳压器安全阀在断电事故后开启1次、开启5次、开启13次后卡开失效及正常启闭4种工况。结果表明：安全阀开启1次后卡开失效事故进程最快,后果最严重;不卡开的情况,事故进程最慢;在安全阀开启13次以内的卡开失效时,各工况放射性物质释放至各部位的份额均比较接近,放射性后果的影响差别不大。

英文摘要：

Aiming at the blackout accident, this paper presents a ship reactor model by use of the integration code of MELCOR. The model is used to analyze severe accidents. The analysis refers to four operating conditions： the pressurizer safe valve opening 1 time, 5 times, 13 times, and reiterative times. The result shows that the accident happens fastest and the aftereffect is the most serious after safe valve opens 1 time, and the accident happens slowest after the opening in reiterative times. When the safe valve opening is less than 13 times, the radioactive fraction is nearly the same in every situation and the radioactive aftereffect is not sensitive.