蒙特卡罗与离散纵标耦合方法在压水堆堆腔漏束计算中的应用

摘要

Coupling of the Monte Carlo (MC) method and the discrete ordinate (SN) method is studied. An SN-MC coupling scheme is adopted in order to eliminate low sampling efficiency of the MC method and difficulty in complex geometrical modeling of the SN method. In the coupling method, the SN code provides neutron angular flux, and a coupling program is used to calculate probability distributions of surface sources. A modified source sampling subroutine is used to produce a combined surface source which contains bottom, top and side surfaces at the same time, and then a Monte Carlo calculation is performed. Preliminary numerical results demonstrate that the coupling method is correct and it can be used in pressurized water reactor cavity radiation streaming calculation.%为克服蒙特卡罗(MC)方法计算时间长和离散纵标(SN)方法复杂几何描述不精确的困难,采用SN-MC耦合计算流程,研究了基于蒙特卡罗方法和离散纵标方法的耦合方法.耦合方法的主要思想是根据离散纵标程序提供的中子角通量,利用接口程序计算出面源的分布概率,然后由修改后的源抽样子程序生成包括上下圆面源和圆柱面源的组合源,提供给蒙特卡罗程序进行计算分析.初步计算结果表明,该耦合方法是正确的,可用于压水堆堆腔漏束的计算分析.