从多重故障角度探讨高放废液贮存系统DEC  

Discussion on DEC of High-level Radioactive Waste Liquid Storage System from the Perspective of Multiple-failure

作　　者：吕丹 杨欣静 汪世军 杨志义 杨浩 徐春艳 刘新华 Lyu Dan;Yang Xinjing;Wang Shijun;Yang Zhiyi;Yang Hao;Xu Chunyan;Liu Xinhua(Nuclear and Radiation Safety Center,Ministry of Ecology and Environment,P.R.C.,Beijing,102445,China;China Nuclear Power Engineering Co.,Ltd.,Beijing,100840,China)

机构地区：[1]生态环境部核与辐射安全中心,北京102445 [2]中国核电工程有限公司,北京100840

出　　处：《核动力工程》2022年第2期160-166,共7页Nuclear Power Engineering

基　　金：后处理设施安全审评若干关键技术研究。

摘　　要：设计扩展工况(DEC)分析是核电设施超设计基准事故分析的重要内容,目前后处理设施领域尚无这方面实践。以后处理设施高放废液贮存系统为研究示范对象,基于工程判断和确定论方法,从多重故障的角度识别DEC。研究结果表明:在高放废液贮存系统的29例工况中,14例不会造成放射性物质向外环境的超标释放,属于DEC;8例可能造成放射性物质向外环境的超标释放,如果混凝土浇筑层对废液具备包容功能、设备室具备泄爆或抗爆功能,则这8例工况不会对外环境造成超标释放,也可纳入DEC;剩余的7例会造成放射性物质向外环境的超标释放,应通过提高橙区过滤器间排风过滤、烟囱的设备可靠性,实现放射性气溶胶向外环境释放的量级不超过选址假想事故的释放水平。The analysis of design extension condition(DEC)is an important part of the analysis of beyond-design-basis accidents of nuclear power facilities.Currently there is no such practice in the field of post-processing facilities.The high-level radioactive waste liquid storage system of the post-processing facility is taken as the research and demonstration object.Based on engineering judgment and deterministic methods,DEC is identified from the perspective of multiple-failure.The results show that among the 29 working conditions of high-level radioactive waste liquid storage system,14 conditions will not cause excessive release of radioactive substances to the environment,which belongs to DEC;8 conditions may cause excessive release of radioactive material to the external environment.If the concrete pouring layer has the function of containing the waste liquid and the equipment room has the function of venting or anti-explosion,then these 8 conditions will not cause excessive release to the external environment and can also be included in DEC.The remaining 7 conditions will cause excessive release of radioactive material to the external environment.By improving the equipment reliability of exhaust filtration and chimney in the filter room of orange area,the magnitude of radioactive aerosol release to the environment shall not exceed the release level of hypothetical accident of siting.

关 键 词：多重故障 高放废液贮存系统 设计扩展工况(DEC) 

分 类 号：TL334[核科学技术—核技术及应用]