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栅元模块化特征线方法(MOC)在处理压水堆组件水隙等问题上存在几何处理上的困难。为了克服这些问题,采用Fortran语言开发了基于组件模块化特征线方法(AMRT)的中子输运计算程序NECP-Medlar,并采用两重粗网有限差分方法进行加速。2D C5G7基准题和典型压水堆组件问题的数值计算结果表明,该程序具有良好的计算精度和较高的计算效率,并且能够通过直接计算组件之间的水隙,较精确地描述组件中子通量密度的分布。
The Cell Modular Feature Line Method (MOC) has some geometric processing difficulties in dealing with the water gap of PWR assemblies. To overcome these problems, a neutron transport calculation program NECP-Medlar based on component modular feature line method (AMRT) was developed using Fortran language and accelerated by a two-pass finite-difference finite-difference method. 2D C5G7 benchmark and typical PWR assembly numerical results show that the program has good accuracy and high computational efficiency, and can directly calculate the water gap between components, more accurately describe the components of neutrons Flux density distribution.