基于拼接裂变矩阵的燃耗计算方法研究  

Research on Burnup Calculation Method Based on Splicing Fission Matrix

作　　者：高睿霜 刘晓晶[1] 何东豪 潘清泉 Gao Ruishuang;Liu Xiaojing;He Donghao;Pan Qingquan(Shanghai Jiao Tong University,Shanghai,201100,China)

机构地区：[1]上海交通大学,上海201100

出　　处：《核动力工程》2024年第2期19-23,共5页Nuclear Power Engineering

摘　　要：为了实现高效率的输运-燃耗耦合计算,本文基于拼接裂变矩阵理论提出了一种新的燃耗计算方法。拼接裂变矩阵方法使系统的裂变矩阵可以通过预先计算的数据库获得,再根据计算模型的实际工况,按照终点区域性质进行拼接。裂变矩阵数据库采用蒙特卡罗固定源计算得到,堆芯计算也不需要蒙特卡洛模拟,因此可避开耗时的临界计算。本文采用新的燃耗计算方法计算了一个典型两组件模型燃耗600有效满功率天(EFPD)的有效增殖因子和裂变源分布,结果表明燃耗-富集度复合修正比例可将裂变源均方根误差控制在0.7%以下,证明该算法的可行性。In order to realize efficient transport-burnup coupling calculation,a new calculation method based on splicing fission matrix theory is proposed in this paper.The combined fission matrix method enables to obtain the system fission matrix from a pre-calculated database,and then the database matrices are combined according to the actual conditions of the calculation model and the properties of the terminal area.The fission matrix database is obtained by Monte Carlo fixed source calculation,and the core calculation does not need Monte Carlo simulation,so the timeconsuming critical calculation can be avoided.In this paper,the effective multiplication factor and fission source distribution of a typical two-assembly model with a burnup up to 600EFPD are obtained.The burnup-enrichment composite correction ratio can reduce the root-mean-square error of the fission source to less than 0.7%,thereby confirming the feasibility of this algorithm.

关 键 词：拼接裂变矩阵 蒙特卡洛方法 燃耗计算 

分 类 号：TL329[核科学技术—核技术及应用]