核电站LOCA释放源项的模拟计算

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英文篇名：Simulation Calculation of Source Term Released During LOCA 作者：田侑成 ; 郭江华 ; 龙林鑫 ; 聂矗 ; 蔡林 英文作者：TIAN Youcheng;GUO Jianghua;LONG Linxin;NIE Chu;CAI Lin;Key Laboratory of Hydraulic Machinery Transients(Wuhan University),Ministry of Education;Hubei Key Laboratory of Waterjet Theory and New Technology(Wuhan University); 关键词：LOCA ; 释放源项 ; ORIGEN2 ; 模拟计算 英文关键词：LOCA;;Source term;;ORIGEN2;;Simulation calculation 中文刊名：HKXY 英文刊名：Nuclear Science and Engineering 机构：武汉大学水力机械过渡过程教育部重点实验室;武汉大学水射流理论与新技术湖北省重点实验室; 出版日期：2019-02-15 出版单位：核科学与工程 年：2019 期：v.39;No.155 基金：国家重点研发计划资助(2017YFB0503302);; 中央高校基本科研业务费专项资金资助(413000060,413000041,413000062) 语种：中文; 页：HKXY201901014 页数：5 CN：01 ISSN：11-1861/TL 分类号：85-89

摘要

文章在对轻水堆核电站先进堆型AP1000失水事故(LOCA)的事故进程分析的基础上,明确了失水事故堆芯释放源项的核素类型,再基于《AP1000设计手册》中提供的基础设计数据,利用ORIGEN2编程对关注的核素进行计算,求取各核素在0～8 h内放射性活度随时间的变化。并将计算结果与设计值进行对比分析,从结果来看,大部分核素的计算值与设计值数量级基本吻合,部分核素的计算值与设计值之间存在1～2个数量级的差异,这是因为在源项选择中忽略了部分核素,此外,选取的堆芯放射性核素的积存量为保守的基准设计值。核电站应当加强对碱金属、惰性气体和碘的关注。在事故前期,碱金属138Cs约占总放射性的85.6%;事故后期,则是惰性气体133Xe占比最大,约为53.1%。
        Based on the analysis of how the accident happen and proceed,to identify the forms of the source terms released during the accident,then to use ORIGEN2 programming to calculate the radionuclides concerned so to get how the radioactivity of the radionuclides change during 8 hours after the accident occur by data provided in the AP1000 Design Manual. Then,comparing the calculated results to the design values. The results show that values of most nuclides calculated are in good agreement with the design values,and there are 1～2 orders of magnitude difference between the calculated values and design values of somenuclides,which is because the fact that some nuclides are neglected when selecting the source terms and that the inventory of radionuclides selected is a conservative design value. Nuclear power plants should pay more attention to alkali metals,noble gases and iodine. In the early stage of the accident,138 Cs accounts for about 85.6%of the total radioactivity. In the later stage of the accident,the ratio of 133 Xe is the largest,which is about 53.1% of the total radioactivity.

引文

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