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随着各种新堆型的提出,全堆芯非均匀计算的需求也日益迫切。基于需求和可行性的考虑,提出了二维/一维(2D/1D)耦合方法求解三维(3D)非均匀问题,国际上已经开发出许多这样的程序。本文基于模块化特征线方法开发了2D/1D耦合程序—MOCHA_2D1D,2D耦合程序计算采用模块化特征线方法,1D耦合程序计算采用Sn差分方法。经过验证,程序计算精度符合反应堆物理计算要求。
With the development of various new types of stacks, the demand for full core non-uniform calculation is also increasingly urgent. Based on the demand and feasibility, two-dimensional / one-dimensional (2D / 1D) coupling method is proposed to solve three-dimensional (3D) nonuniformity problem. Many such procedures have been developed in the world. In this paper, a 2D / 1D coupling program-MOCHA_2D1D was developed based on the modular feature line method. The modular feature line method was used to calculate the 2D coupling program and the Sn differential method was used to calculate the 1D coupling program. After verification, the calculation accuracy of the program accords with the reactor physics calculation requirement.