包壳相关行为对严重事故进程的影响分析  

Effect Analysis of Cladding Related Behavior under Severe Accident

作　　者：袁显宝 石强 张彬航 魏靖宇 张永红 周建军 郭盼 YUAN Xian-bao;SHI Qiang;ZHANG Bin-hang;WEI Jing-yu;ZHANG Yong-hong;ZHOU Jian-jun;GUO Pan(College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002, China;Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, Yichang 443002, China)

机构地区：[1]三峡大学机械与动力学院,宜昌443002 [2]湖北省水电机械设备设计与维护重点实验室,宜昌443002

出　　处：《科学技术与工程》2022年第19期8333-8339,共7页Science Technology and Engineering

基　　金：国家杰出青年科学基金(11805112);国家自然科学基金(11805112,1184706)。

摘　　要：严重事故工况下,锆合金包壳与水剧烈反应,产生氢气并释放大量的热,会导致堆芯熔化。熔化的锆合金包壳发生共晶反应,二氧化铀与二氧化锆在低于其熔点时发生熔化,将对堆芯熔毁事故进程产生显著影响。使用一体化严重事故分析程序,研究百万千瓦级压水堆核电站发生全场断电叠加破口事故下,包壳行为对严重事故进程的影响。分析结果表明,锆水反应精细化计算模型修改后,全场断电叠加大破口事故下堆芯产氢量减少24.1 kg;共晶反应能够加速熔融物向下封头迁移同时延长堆芯失效时间。Under severe accident conditions,zirconium alloy cladding reacts with water violently to produce hydrogen and release a lot of heat,which will lead to core melting.The eutectic reaction takes place in the molten zirconium alloy cladding,and the fusion of uranium dioxide and zirconia below their melting point will have a significant impact on the process of core meltdown accident.The integrated severe accident analysis program code was used to study the influence of cladding behavior on the process of severe accident in the event of the full power outage superposition break accident in the whole plant of the 1000 MWe nuclear power plant.The analysis results show that after the refined calculation model of zirconium water reaction is modified,the hydrogen production in the core is reduced by 24.1 kg under the superposition of full power outage and large break accident;eutectic reaction can accelerate the migration of melt to the lower head,prolong the time of core failure.

关 键 词：严重事故 一体化程序 包壳行为 堆芯熔化 

分 类 号：TL421[核科学技术—核技术及应用]