线性子链法在排放源项计算中的应用

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英文篇名：Application of TTA on the calculation of released source term 作者：李璐 ; 魏国强 ; 王晓亮 ; 白晓平 ; 郑伟 英文作者：LI Lu;WEI Guoqiang;WANG Xiaoliang;BAI Xiaoping;ZHENG Wei;China Nuclear Power Engineering Co., Ltd.; 关键词：线性子链法 ; 排放源项 ; PWR-GALE ; ORIGEN 英文关键词：TTA;;released source term;;PWR-GALE;;ORIGEN 中文刊名：辐射防护 英文刊名：Radiation Protection 机构：中国核电工程有限公司; 出版日期：2019-03-20 出版单位：辐射防护 年：2019 期：02 语种：中文; 页：45-51 页数：7 CN：14-1143/TL ISSN：1000-8187 分类号：X771

摘要

根据线性子链法原理和流出物排放源项计算模型的特点,本文建立了全面自动搜索核素链的方法,覆盖了所有核素涉及到的核素链,推导出了排放源项模型的解析表达式,将复杂的衰变链分解为数条线性链,对每一条核素链分别进行解析计算得到每个核素的核素浓度。将这一方法用于核电厂排放源项的活度计算,并将本方法求解结果与PWR-GALE的ORIGEN求解模块的结果比较,以及将最终排放源项的计算结果与国内某核电厂排放源项比较,对比表明,大部分核素浓度计算结果与ORIGEN一致,短寿命核素浓度的计算中由于ORIGEN采用长期平衡近似以及衰变链简化处理后所得结果偏于保守;本方法计算排放源项所得结果与国内某核电厂排放源项结果非常符合。本方法应用了全面自动搜索的线性子链法,自动搜索添加衰变链,并使用解析法依次对每条衰变链的每个核素进行计算,使得计算结果更加全面,结果更准确。
        According to the theory of Transmutation Trajectory Analysis(TTA) and the characteristic of effluent released source term model, the paper developed a method of overall automatic searching linear decay chain, which covering all of the involving nuclear decay chain, and then deduced the analysis result of released source term equation. Through TTA method, the complicated network of decay chains are split into several linear decay chains and then each linear decay chain is analytically calculated to get the concentration of each nuclide. The TTA method was applied on the activity calculation of nuclear power plant released source term, and the calculated results of TTA method were compared by those of ORIGEN, and then the final released source term of TTA method was compared by the released source term in a nuclear power plant in China. The comparison results showed that most of the nuclides calculated by TTA are coincided with those of ORIGEN, and the short half-life nuclides calculated by ORIGEN were more conservative because of the simplified procession of decay chains and the approximation of secular equilibrium, and the released source term calculated by TTA method were in good agreement with those of Chinese NPP. The application of overall automatic searching TTA method on the calculation of released source term makes the results more comprehensive and more accurate.

引文

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