处理轴向三维非均匀效应的单组件均匀化模型

Single Assembly Pin-by-Pin Homogenization Model for Handling Axial 3D Heterogeneity Effect

传统以两维单组件模型为基础的均匀化理论及后续的改进均匀化理论产生的粗网均匀化参数无法直接体现轻水堆(LWR)堆芯轴向所存在的非均匀性。本文提出了以单组件逐棒模型为基础的三维均匀化方法,为堆芯计算提供粗网均匀化参数,在维持堆芯粗网计算模型的前提下实现对三维效应的处理。基准数值实验表明,本文提出的方法具有较好的精度表现,适用于堆芯轴向三维非均匀性的处理。

Traditional and advanced homogenization model based on single assembly and color-set/full core transport solution can not represent the axial heterogeneity of Light Water Reactor(LWR). The paper proposed a new 3D homogenization model based on the single assembly pin-by-pin solution to provide the coarse mesh parameters for 3D nodal calculation. Numerical result from BWR mini-core benchmark shows that the 3D effect on core axial power distribution can be reproduced accurately.