摘要
特征线方法通过在计算区域密置特征线来计算角通量,对于计算区域的材料分布和几何结构没有要求,因此特征线方法的几何处理能力受制于几何描述模块对于各种几何区域的描述能力。基于体素构造(CSG)方法,开发了三维特征线程序MOCP的几何描述模块。该几何描述模块可描述随机分布的球床。针对球形燃料的网格划分方式进行了研究,临界球的计算结果表明,当径向网格超过30层时,keff的相对误差小于0.1%。通过对几何描述方式的改进大幅提高了三维特征线追踪的效率,并且实现了在各种形状边界上的特征线布置。
In MOC(method of characteristics),angular flux is calculated by sweeping over all the tracks densely arranged in the district.The sweeping process is independent of material distribution and geometry.As a result,the capability of treating different kinds of geometry structures of MOC is limited by the capability of geometry modeling modular.The geometry modular of the code MOCP(method of characteristics for high temperature pebble-bed reactor)was developed based on CSG(constructive solid geometry)method.The geometry modular of MOCP is capable of describing the stochastic distributed pebble-bed.The meshing method of spherical fuel was studied.The result shows that relative error of k eff of a critical sphere is less than 0.1%when the critical sphere is divided into more than 30 layers.Furthermore,the 3D ray tracing efficiency is greatly improved by optimizing the geometry tree and MOCP is able to arrange track on the different shapes of the geometries including cube,cylinder and sphere.
作者
郭建
郭炯
王黎东
卢佳楠
牛进林
王毅箴
邬颖杰
李富
GUO Jian;GUO Jiong;WANG Lidong;LU Jianan;NIU Jinlin;WANG Yizhen;WU Yingjie;LI Fu(Institute of Nuclear and New Energy Technology,Collaborative Innovation Center of Advanced Nuclear Energy Technology,Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education,Tsinghua University,Beijing 100084,China)
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2018年第3期412-419,共8页
Atomic Energy Science and Technology
基金
国家科技重大专项资助项目(ZX06901)
国家自然科学基金资助项目(11375099)
863计划资助项目(2014AA052701)
关键词
特征线方法
输运计算
体素构造方法
球床高温气冷堆
method of characteristics
neutron transport
constructive solid geometry
pebble-bed HTR
