NECP软件包中NECL子群数据与任意几何共振模块研制

本文基于子群方法对NECP软件包开发了多群数据库模块和子群共振计算模块。采用本实验室开发的二维任意几何输运程序矩阵MOC作为子群共振模块的求解器。使用MCNP与子群程序计算一系列的共振基准题，并比较了两者所计算的无限增殖因数k_inf和²³⁵U与²³⁸U的微观截面。结果表明，子群程序对任意几何有良好的适应性和精度，可适用于二维任意几何的共振计算。

Design of NECL Subgroup Data Module and Arbitrary Geometry Resonance-Calculation Code in Neutronics Evaluation Comprehensive Package

A multi-group data module and a subgroup resonance calculation code were designed for Neutronics Evaluation Comprehensive Package based on subgroup method in this paper. A self-advanced 2D transport module called matrix MOC was employed as solver in subgroup resonance calculation module. Finally, a series of resonance benchmarks were calculated by MCNP and subgroup code respectively, and the k_inf and macro cross section of ²³⁵U and ²³⁸U by MCNP and subgroup code were compared. The results show that the subgroup code has enough accuracy and adaptability for arbitrary geometries and it’s suitable for 2D arbitrary resonance calculation.