蒙特卡罗均匀化与多群蒙特卡罗输运研究

Research on Homogenization via Monte Carlo Method and Its Application in Multi-group Monte Carlo Transport Calculation

基于蒙特卡罗方法(MCNP)进行组件均匀化产生少群常数继而进行堆芯计算,是MCNP应用于堆芯物理分析的一种可行方案。研究MCNP统计产生少群截面以及等效均匀化理论应用于多群蒙特卡罗计算的方法,并进行数值验证。结果表明,本文提出的利用MCNP模拟产生等效均匀化少群常数的方法是可行的,在保证预定精度的条件下提高了效率。

A two-step calculation scheme may be one of the feasible ways if we intend to do core simulations with Monte Carlo method, i.e., assembly level calculations with Monte Carlo method （MCNP） are done at first, the group constants are tallied at the same time, and then the core level simulations are performed using these group constants. In this paper, the group constants generation method via Monte Carlo is studied, and an equivalent homogenization theory has been applied to improve the results. The numerical calculation results illustrate that the group constants generation method via Monte Carlo is practicable, which can improve the efficiency of core simulations while ensuring the accuracy.