COSINE软件包组件计算程序LATC的燃耗计算模块开发与验证

Development and Verification for Burnup Calculation Module of Lattice Code LATC of COSINE Package

摘要: 燃耗计算是反应堆组件参数计算程序的核心功能之一，其计算精度直接影响堆芯物理计算精度。本文系统研究了组件参数计算程序中燃耗计算方法，建立了燃耗计算理论模型，给出了能有效解决燃耗方程刚性的数值方法，根据此方法编制了LATC程序的燃耗计算模块并进行了数值验证。计算结果表明，该燃耗计算模块精度较高，在大燃耗步、深燃耗下仍可得到合理可信的结果。

Abstract: The burnup calculation is one of the main functions of the assembly homogenization parameter calculation program, which directly affects the core physics calculation accuracy. The burnup calculation method for assembly calculation was researched in this paper. A theoretic depletion model was established. An effective numerical method for solving the stiff equation was given and successfully employed in the lattice code LATC of COSINE package. The numerical tests show that the burnup calculation module in LATC code can give reasonable and reliable results in large burnup steps and deep depletion situation.