可显式处理燃料组件轴向非均匀性的粗网节块方法  

Coarse-Mesh Nodal Methods with the Capability to Explicitly Handle the Material Heterogeneity in the Axial Direction of a Fuel Assembly

作　　者：吕栋[1] 张少泓 

机构地区：[1]上海交通大学核科学与工程学院,上海200240 [2]上海核星核电科技有限公司,上海200235

出　　处：《核动力工程》2014年第5期4-8,共5页Nuclear Power Engineering

摘　　要：针对传统节块方法无法妥善处理节块内由于燃料组件定位格架或部分插入的控制棒而引入的非均匀性这一弱点,提出2种可显式处理这类非均匀性的方法。以国际原子能机构(IAEA)公布的三维基准问题及实际电厂反应堆问题为例对这2种方法进行计算验证,计算验证表明,本文建议的方法可以实现在粗网节块法的框架内直接显式处理燃料组件的轴向非均匀性。The incapability to handle the heterogeneity introduced by spacer grid and partially-inserted control rod has long been considered as one of the noticeable defects for the conventional coarse-mesh nodal methods. To improve this defect, two new nodal methods with the capability ＇to explicitly handle these heterogeneities in the framework of coarse-mesh nodal methods are proposed. Numerical results for IAEA 3D benchmark problem and the practical power reactor problems demonstrate that the proposed sub-mesh method is quite successful, it is able to effectively handle not only the partially inserted control rod, but also the f＇me spacer grid within an axial coarse mesh.

关 键 词：节块法 控制棒尖点效应 子网格方法 轴向非均匀性 

分 类 号：TL334[核科学技术—核技术及应用]