维修停堆模式下完全丧失余热排出系统事故分析  

Analysis of Total Loss of RRA Accident Under MCS Mode

作　　者：刘建昌 沈永刚 陈韵茵 卢向晖 欧阳勇 Liu Jianchang;Shen Yonggang;Chen Yunyin;Lu Xianghui;Ouyang Yong(CGN Research Institute Co.,Ltd.,ShenZhen 518000,China)

机构地区：[1]中广核研究院有限公司

出　　处：《核安全》2019年第5期85-89,共5页Nuclear Safety

摘　　要：针对CPR1000,本文采用CATHARE程序分析了维修停堆(Maintenance Cold Shutdown,MCS)模式下完全丧失余热排出系统(Residual Heat Removal System,RRA)事故。事故发生后,若不采取任何缓解措施,堆芯衰变热将无法及时导出,使一回路冷却剂温度上升直至沸腾,然后一回路冷却剂装量下降,导致堆芯裸露。分析结果表明,从事故发生到堆芯出现裸露经历的时间为4480 s,操纵员具有足够的时间采取相应的缓解手段。In the present paper,the transient process of total loss residual heat removal system(RRA)accident in maintenance cold shutdown(MCS)mode of CPR1000 is analyzed by using CATHARE program.After the ac cident,the decay heat cannot be removed in time without any operator interventions.Primary coolant tempera ture rises until boiling.After that,primary coolant load decreased,which leads to core uncover.The results show that the time period between the beginning of the accident and the core uncover is 4480 seconds,there is enough time for operator to prepare proper interventions.

关 键 词：维修停堆模式 完全丧失RRA 时间裕量 

分 类 号：TL383[核科学技术—核技术及应用]