【作者】 李健； 佘顶； 石磊；

【Author】 LI Jian;SHE Ding;SHI Lei;Institute of Nuclear and New Energy Technology,Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education,Collaborative Innovation Center of Advanced Nuclear Energy Technology,Tsinghua University;

【机构】 清华大学核能与新能源技术研究院先进反应堆工程与安全教育部重点实验室先进核能技术协同创新中心；

【摘要】 燃耗方程一般用于描述核素由于中子反应和衰变的产生及消耗过程。对于和外界存在物理或化学交换的核素系统,例如使用液体燃料的反应堆、乏燃料后处理设施以及运行时连续换料或连续分离裂变产物的一些先进反应堆等,燃耗方程带有一个连续添加项或移出项,表现为非齐次燃耗方程形式。NUIT(Nuclide Inventory Tool)程序是由清华大学核能与新能源技术研究院(INET)自主研发的放射性总量计算程序,该程序采用多种燃耗算法,具有较高的计算精度和效率。为了提高程序的适用性、扩展程序功能,本文基于NUIT程序研究了非齐次燃耗方程的计算方法,包括线性子链方法(TTA)和矩阵指数方法。通过计算例题,初步验证了NUIT程序当中的非齐次燃耗方程计算方法的正确性与可用性。更多还原

【Abstract】 The burnup equation with nonhomogeneous term is appropriate for the nuclide system with physical or chemical exchange with the surroundings,and its algorithm differs from the ordinary one.NUIT(Nuclide Inventory Tool) is a newly developed radioactive nuclide inventory code for HTGR reactor core,and it possesses several advanced burnup solvers.In order to improve the code applicability,this paper established a depletion model with nonhomogeneous term for NUIT.Transmutation trajectory analysis(TTA) method and several advanced matrix exponential methods have been studied.The correctness and usability of this algorithm has been preliminarily validated on some cases.更多还原