SARAX程序在复杂非结构几何堆芯计算中的应用研究  

Application of SARAX code system on the calculation of complex unstructured geometry core

作　　者：肖博文 郑友琦[1] 王永平[1] 乔梁 陶昱姗 刘啸岳 XIAO Bowen;ZHENG Youqi;WANG Yongping;QIAO Liang;TAO Yushan;LIU Xiaoyue(Xi'an Jiaotong University,Xi'an 710049,China;Nuclear Power Institute of China,Chengdu 610041,China)

机构地区：[1]西安交通大学,西安710049 [2]中国核动力研究设计院,成都610041

出　　处：《核技术》2023年第6期113-120,共8页Nuclear Techniques

基　　金：国家自然科学基金(No.U2167205);国家重点研发计划项目(No.2019YFB1901102)资助。

摘　　要：随着反应堆堆芯设计的复杂化,给堆芯物理的建模计算带来了一定的挑战。针对复杂几何堆芯的精细建模计算,采用基于任意三棱柱网格的离散纵标节块法,通过构造实体几何的方式,实现了复杂非结构几何堆芯的准确建模以及非结构网格的生成,同时由于非结构网格计算量大,采用了块雅各比的并行算法以减少堆芯输运计算时间。将SARAX程序用于空间反应堆和热管堆的计算中,特征值和堆芯径向功率分布结果与多群蒙特卡罗的计算结果吻合良好,特征值的计算偏差小于3.00×10^(-3),径向功率分布的相对偏差小于1.5%,表明SARAX程序在复杂非结构几何堆芯计算中具有较高的精度。[Background]With the increase of complexity of reactor core design,the core modeling and calculation have brought challenges.[Purpose]This study aims to implement the accurate modeling and calculation of unstructured geometry core.[Methods]Based on discrete ordinate nodal method for arbitrary triangular-z geometry,the precise modeling and mesh generation of unstructured core were established by constructive solid geometry(CSG),and Block-Jacobi parallel algorithm was employed to reduce calculation time of reactor core.Finally,based on the developed SARAX program,core physics calculations for new complex geometries of a space reactor and a heat pipe reactor were performed for accuracy verification by using Block-Jacobi parallel algorithm combining with established precise model and mesh.[Results]The verification results show that the effective multiplication factor and radial power distribution agree with that of multi-group Monte-Carlo calculation.The calculation deviation of eigenvalues is less than 3.00×10^(-3),and the relative deviation of radial power distribution is less than 1.5%.[Conclusions]Results of this study show that SARAX code has the ability of modeling and higher accuracy in the calculation of unstructured geometry core.

关 键 词：非结构堆芯 离散纵标节块法 网格生成 并行算法 程序验证 

分 类 号：TL32[核科学技术—核技术及应用]