精细化中子输运计算程序HNET动力学计算初步验证  

Preliminary verification of the kinetics calculation for the high-fidelity neutron transport program HNET

作　　者：康乐 郝琛 KANG Le;HAO Chen(Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China)

机构地区：[1]哈尔滨工程大学核安全与仿真技术国防重点学科实验室,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2021年第12期1762-1768,共7页Journal of Harbin Engineering University

基　　金：国家重点研发计划项目(2018YFE0180900).

摘　　要：针对精细化瞬态中子输运计算的高耗时问题,本文开展了瞬态中子输运计算方法研究及程序开发。基于二维/一维方法开发了三维全堆芯一步法精细化中子输运计算程序,着重开展了时空中子动力学的算法研究及程序模块开发。针对三维瞬态输运问题,将其转化为二维与一维的瞬态固定源问题,分别采用特征线法与节块展开法进行求解,同时,采用两级基于广义等价理论的粗网有限差分方法作为三维计算框架并加速全局的迭代收敛。最后,采用C5G7-TD非均匀瞬态基准题对该程序的中子动力学模块开展计算精度方面的验证,并与国际知名高保真中子学程序进行对比分析。结果表明:自主开发的时空动力学模块计算精度高,能够满足三维高保真瞬态中子输运计算的需求。To solve the time consumption problem in high-fidelity transient neutron transport calculations,the development of a transient transport calculation method and program is presented in this work.Based on the 2D/1D method,a 3D whole-core one-step high-fidelity neutron transport calculation program HNET(high-fidelity neutron transport program)is developed.This study focuses on the calculation method and the program development of neutron kinetics.The 3D transient transport problem is translated into 2D and 1D transient fixed source problems,which are solved by the method of characteristics and nodal expansion method,respectively.Then,a two-level generalized equivalence theory-based coarse mesh finite difference method is adopted at the same time as a 3D calculation framework and accelerator for the convergence of global iteration.To verify the calculation accuracy of the transient calculation module of HNET,C5G7-TD heterogeneous transient benchmark problems are used.The obtained results are analyzed and compared with the well-known high-fidelity neutronics program MPACT.The numerical results indicate that the space-time kinetics module of HNET is accurate and can satisfy the requirements of 3D high-fidelity transient transport calculations.

关 键 词：时空动力学 中子输运方程 二维/一维方法 特征线法 广义等价理论 粗网有限差分 两级加速 C5G7-TD 高保真 

分 类 号：TL32[核科学技术—核技术及应用]