“华龙一号”严重事故下蠕变诱发SGTR风险管理  

The Study of Creep Induced SGTR in Severe Accident for HPR1000

作　　者：牛世鹏 余蕴 刘宇 牛岳鹏 张佳佳 NIU Shipeng;YU Yun;LIU Yu;NIU Yuepeng;ZHANG Jiajia(China Nuclear Power Engineering Co.,Ltd.,Beijing 100840,China;China Huaneng Group Co.,Ltd.,Southern Branch,Guangzhou of Guangdong Prov.510623,China;Nuclear and Radiation Safety Center,Ministry of Ecology and Environment,Beijing 100082,China)

机构地区：[1]中国核电工程有限公司,北京100840 [2]中国华能集团有限公司南方分公司,广东广州510623 [3]生态环境部核与辐射安全中心,北京100082

出　　处：《核科学与工程》2021年第1期48-56,共9页Nuclear Science and Engineering

摘　　要："华龙一号"严重事故下可能发生蠕变诱发SGTR事故,导致一回路放射性物质旁通安全壳,进而造成放射性物质大量释放。因此,在核电厂严重事故管理和二级PSA中,需要开展蠕变诱发SGTR风险研究和管理。基于Larson-Miller蠕变失效模型,结合ROAAM方法,综合考虑了传热管缺陷和过渡段水封对蠕变诱发SGTR的影响,开发了"华龙一号"一回路蠕变失效模型。在此基础上,自主开发了"华龙一号"严重事故下蠕变诱发SGTR概率计算程序PACIS。采用PACIS程序,以"华龙一号"为研究对象,选取了一回路高压且二次侧丧失给水的典型事故序列进行了蠕变诱发SGTR概率分析。为"华龙一号"严重事故管理导则中蠕变诱发SGTR事故预防和缓解策略提供了理论支持。结果表明通过开展"华龙一号"严重事故下蠕变诱发SGTR风险研究,并在严重事故管理和二级PSA中进行了应用,有效提高了"华龙一号"应对严重事故的能力。The creep induced SGTR may arise in severe accident,which may bypass the containment and lead to the large release of fission products.Therefore,it is essential for severe accident management and level 2 PSA to evaluate the risk of creep induced SGTR in severe accident.In this paper,the deterministic creep rupture model for primary circuit was constructed based on Larson-Miller creep rupture model,together with ROAAM method,considering the influence of steam generator tube flaws and loop seal.On the basis of the deterministic model,the creep induced SGTR probabilistic analysis program PACIS was developed for HPR1000.Then take the HPR1000 as the study object,the probabilities of creep induced SGTR for representative accident sequences were assessed with PACIS.The results provide theoretical support for the prevention and mitigation strategies of creep induced SGTR in SAMG of HPR1000.The study on creep induced SGTR for HPR1000,which was applied on severe accident management and level 2 PSA,improved the ability to deal with severe accident for HPR1000 effectively.

关 键 词：“华龙一号” 蠕变诱发SGTR 严重事故管理 二级PSA 

分 类 号：TL364.5[核科学技术—核技术及应用]