全堆芯Pin by Pin中子扩散节块法CMFD加速  

Full Core Pin by Pin Neutron Diffusion Nodal Method Based on CMFD Acceleration

作　　者：李志勇 LI Zhiyong(China General Nuclear Research Institute Company, Shenzhen 518031,China)

机构地区：[1]中广核研究院有限公司,深圳518031

出　　处：《计算物理》2019年第3期317-322,共6页Chinese Journal of Computational Physics

摘　　要：采用节块方法中有效的半解析方法求解中子扩散方程,在径向采用pin by pin的计算方式且中子通量基于两阶展开,在轴向采用基于4阶展开中子通量的节块法,并且进行全堆粗网有限差分(CMFD)加速,以达到计算精度与计算效率的平衡.通过IAEA 2D/3D基准问题和自定义3D pin by pin参考问题的数值计算,验证所提出的方法能够达到预期的精度,同时CMFD能够取得很好的加速效果.A classical semi-analytical nodal method for neutron diffusion equation with second order neutron flux expansion in radial pin by pin level and 4 th order expansion for axial neutron flux is used. A full core coarse mesh finite difference(CMFD) acceleration is adopted in order to achieve good calculation accuracy and efficiency. With IAEA 2 D/3 D benchmark problem and self-define 3 D pin by pin reference problem numerical calculation, it is demonstrated that the proposed methodology achieve anticipated accuracy and with very good CMFD acceleration.

关 键 词：中子扩散 PIN by PIN 半解析节块方法 粗网有限差分 

分 类 号：TL329[核科学技术—核技术及应用]