基于CPACT程序用于换料优化的二维堆芯计算方法研究

Two-dimensional Core Calculation Research for Fuel Management Optimization Based on CPACT Code

燃料管理与优化程序需对堆芯布置方案进行快速评价,常用方法有二维扩散节块法、微扰法、神经网络法等。本文基于三维轻水堆中子扩散计算程序CPACT进行了二维快速堆芯布置方案评价程序开发。在二维堆芯扩散计算中采用引入轴向曲率的方法模拟轴向泄漏,并通过分燃耗点搜索轴向曲率的方式修正计算结果。同时,对控制棒组件截面原有的体积权重等效计算方法进行了改进,提高了二维计算结果的精度。

Fuel management optimization process requires rapid assessment for the core layout program, and the commonly used methods include two-dimensional diffusion nodal method, perturbation method, neural network method and etc. A twodimensional loading patterns evaluation code was developed based on the threedimensional LWR diffusion calculation program CPACT. Axial buckling introduced to simulate the axial leakage was searched in sub-burnup sections to correct the two- dimensional core diffusion calculation results. Meanwhile, in order to get better accuracy, the weight equivalent volume method of the control rod assembly cross-section was improved.