哈尔滨工程大学学报2023，Vol.44Issue(12)：2208-2215,8.DOI:10.11990/jheu.202309017
基于中子均方位移守恒的平均散射角余弦计算
Calculation of average scattering cosine based on conservation of neutron mean square displacement
摘要
Abstract
In the two-step calculation of reactor physics,the average scattering cosine is determined using the scalar flux as the weighting function in the Monte Carlo method for generating group constants,which introduces additional errors.Therefore,starting from the relationship between the mean square displacement and average scattering co-sine,this paper proposes a novel method that calculates the average scattering cosine,conserving the mean square displacement of neutrons.It is realized based on the Monte Carlo particle transport procedure NECP-MCX.Several fast reactor problems with strong anisotropy are selected to test the validity of the proposed method.Compared with the traditional method,the biases of multiplication factors decrease from 588×10-5～796×10-5 to-31×10-5～266×10-5.The maximum relative biases of relative fission reaction rates decrease from 3.754%～4.675%to-0.990%～0.920%,and the root mean squared biases decrease from 1.864%～2.444%to 0.569%～0.612%.The results show that the proposed method can effectively reduce the biases introduced by the traditional method,and has cer-tain application values.关键词
均方位移/平均散射角余弦/群常数/蒙特卡罗方法/NECP-MCX/各向异性/反应堆物理/两步法计算Key words
mean square displacement/average scattering cosine/group constant/Monte Carlo method/NECP-MCX/anisotropy/reactor physics/two-step calculation分类
能源科技引用本文复制引用
秦帅,李云召,贺清明,曹良志,吴宏春..基于中子均方位移守恒的平均散射角余弦计算[J].哈尔滨工程大学学报,2023,44(12):2208-2215,8.基金项目
国家自然科学基金项目(U2067209) （U2067209）
国家级青年人才项目(2019QNRC001) （2019QNRC001）
中核集团领创科研项目. （）
