摘要
节块法在堆芯扩散计算程序中得到广泛应用,但由于采用较粗网格以加快计算速度,给计算结果带来锯齿效应。锯齿效应影响部分与堆芯扩散相关的计算结果。本文提出将部分插棒节块内的中子截面在节块法横向积分方程中进行显式表示的方法,即引入与节块轴向位置相关的截面阶跃函数。数值结果表明,该方法显著改善了锯齿效应引起的控制棒微分价值偏差,特别是基本完全消除了该效应对控制棒相关动力学问题的偏差。
Nodal method is widespread used in reactor core diffusion code ,but as nodal method adopting coarse mesh in order to speedup calculation , so it causes cusping effect .Cusping effect would affect some reactor core diffusion relevant calculation result .In this paper ,the partial inserted rod intro-node cross section in nodal method transverse integration equation was explicitly represented , i .e . node axial position dependent cross section step function was introduced . Numerical results indicate the method greatly improves the control rod differential worth deviation of cusping effect ,in particular nearly completely eliminates the control rod relevant kinetic problem ’ s deviation of this effect .
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2014年第9期1616-1620,共5页
Atomic Energy Science and Technology
关键词
节块法
部分插棒
显式表示法
锯齿效应
nodal method
partial inserted rod
explicit representation method
cusping effect
