基于OpenMC制作轻水堆中子少群截面用于OpenMOC计算  

Production of Few Group Cross Sections of Neutron in Light Water Reactor in OpenMOC Calculation Based on OpenMC

作　　者：周峰 杨永伟 吴翔[1,2,3] 房鹏 王慧巧 杨磊 ZHOU Feng;YANG Yongwei;WU Xiang;FANG Peng;WANG Huiqiao;YANG Lei(Advanced Energy Science and Technology Guangdong Laboratory,Huizhou,Guangdong province 516000,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 73000,China;School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]先进能源科学与技术广东省实验室,广东惠州516000 [2]中国科学院近代物理研究所,兰州730000 [3]中国科学院大学核科学技术学院,北京100049

出　　处：《现代应用物理》2024年第2期61-69,共9页Modern Applied Physics

摘　　要：为了给确定论特征线程序OpenMOC提供高精度轻水堆少群截面库,研究了蒙特卡罗程序OpenMC的输出计数文件,开发了计数转换截面代码CSC,可以将OpenMC计数文件中的中子注量和各反应类型的反应率(单位体积内反应数占总反应数比率)计数进行处理得到中子少群截面。采用这种截面制作方式,制作了不同输运修正方式和不同精细程度能群的少群截面库,提供给OpenMOC计算。分析了轻水堆燃料组件和基准题结果,得到了截面库制作精度较高的方式。采用内散射近似和CASMO-40群制作了中子少群截面库,以OpenMC的计算结果为参考解,对C5G7基准题的结果做了对比。结果表明,k_(eff)偏差为322.5×10^(-5),燃料棒功率相对偏差均小于2%,组件功率相对偏差均小于1%,通过这种方式制作的轻水堆截面库精度良好。To provide a high-precision few group cross sections library for the method of characteristics code OpenMOC,the output count file of Monte Carlo code OpenMC is studied.By developing the counting conversion section code CSC,this code can process the neutron fluence counts and the reaction counts of various reaction types in the OpenMC counting file to obtain the few group cross sections of neutron for OpenMOC.By using this cross sections generation method,the few group cross sections library with different transport correction methods and energy groups with different levels of precision are generated and provided for OpenMOC calculation.Through analyzing the results of fuel assemblies and benchmark questions for light water reactors,a method with high precision in section library generation is obtained.A neutron few group cross sections library is generated by using in-scatter approximation and CASMO-40 group.The results of the C5G7 benchmark questions are compared with the OpenMC calculation results as the reference solution.The results shows that the deviation of k_(eff)is 322.5×10^(-5).The relative deviation of fuel rod power is all less than 2%,and the relative deviation of assemblies power is all less than 1%.The neutron few group cross sections of light water reactor generated in this way has good accuracy.

关 键 词：OpenMC OpenMOC 中子少群截面 计数转截面代码CSC 输运修正 能群结构 C5G7基准题 

分 类 号：TL32[核科学技术—核技术及应用] O571[理学—粒子物理与原子核物理]