三维MOC的球床堆芯CMFD加速研究  

gCMFD acceleration method for solving a pebble-bed reactor by 3D-MOC

作　　者：文宇晨 郝琛 郭建 王毅箴 WEN Yuchen;HAO Chen;GUO Jian;WANG Yizhen(Fundamental Science on Nuclear Safety and Simulation Technology Laboratory,Harbin Engineering University,Harbin 150001,China;China Nuclear Power Engineering Co.,Ltd.,Beijing 100840,China;Institute of Nuclear and New Energy Technology(INET),Tsinghua University,Beijing 100084,China)

机构地区：[1]哈尔滨工程大学核安全与仿真技术重点学科实验室,黑龙江哈尔滨150001 [2]中国核电工程有限公司,北京100840 [3]清华大学核能与新能源技术研究院,北京100084

出　　处：《哈尔滨工程大学学报》2022年第12期1712-1718,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(12075067);中国博士后科学基金项目(2021M703045).

摘　　要：为了解决稀疏长特征线方法在加速效果,特别是降低计算时间上仍存在的不足,本文使用基于广义等价理论的粗网有限差分方法作为三维特征线方法的加速算法,并开发粗网有限差分方法模块用于加速MOCP程序的精细化输运计算。MOCP程序开发三维特征线方法模块针对球床式反应堆进行精细化输运计算,并使用稀疏长特征线方法加速3D-MOC。根据MOCP中构造实体几何建模方法处理球床区域中燃料球细网与粗网的映射关系以保证粗网均匀化参数的准确计算。最后用不同堆型、不同几何模型对粗网有限差分方法加速模块与球床处理模块进行验证,保证粗网与细网严格对应的同时,使3D-MOC整体迭代次数与计算耗时减少约90%。计算结果表明该模块正确且拥有良好的加速效果。To overcome the shortcomings of the macrotrack transport acceleration(MTTA)method in terms of the acceleration effect,especially in reducing the computation time,the generalized equivalence theory-based coarse-mesh finite difference method(gCMFD)is used as the acceleration method for 3D-MOC to develop a gCMFD module for accelerating the high-fidelity neutron transport calculation of the MOCP program.The three-dimensional method of characteristics(3D-MOC)module developed by the MOCP program is used for the high-fidelity neutron transport calculation of pebble-bed reactors,and MTTA is used to accelerate the 3D-MOC.The mapping relationship between the fine mesh and coarse mesh of the fuel sphere in the pebble-bed region is handled according to the constructive solid geometry modeling method in MOCP to ensure an accurate calculation of the coarse-mesh homogenization parameters.Finally,the gCMFD acceleration module and pebble-bed processing module are validated with different types of rectors and geometry models to ensure a strict correspondence between the coarse mesh and fine mesh while reducing the number of iterations and computation time of 3D-MOC by approximately 90%.The numerical results indicate that this module is correct and has an excellent acceleration effect.

关 键 词：特征线方法 构造实体几何方法 精细化中子输运计算 粗网有限差分 广义极小残差算法 广义等价理论 迭代加速 球床式高温气冷堆 

分 类 号：TL329[核科学技术—核技术及应用]