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以典型的小型堆为研究对象,用MELCOR程序对满功率运行的小型堆全部电源丧失严重事故序列进行计算,分析比较几种缓解措施对事故缓解的作用。结果表明:在发生全部电源丧失后,反应堆热阱丧失,并会发生高压熔堆事故,导致安全壳的完整性受到破坏。若应急电源及时恢复,安全注入系统投入,再循环取海水冷却能有效缓解事故进程。
Taking the typical small reactor as the research object, MELCOR program was used to calculate the sequence of loss of all serious power accidents of small power reactors operating at full power. The effects of several mitigation measures on accident mitigation were analyzed and compared. The results show that after all the power loss, the reactor heat sink is lost and a high-pressure melting accident occurs, resulting in the destruction of the integrity of the containment. If the emergency power supply is restored in time, the safety injection system will be put into operation and the seawater recirculation cooling can effectively relieve the accident.