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文章推导了二维中子扩散方程的差分方程、求解差分方程的线超松弛迭代（称内迭代）公式，给出了裂变源项ψ的迭代（称外迭代）公式、有效增殖因子Ｋ＿（ｅｆｆ）的计算公式以及内外迭代的收敛准则，叙述了这个解法在计算机上实现的大概过程。该计算机程序用于高通量堆计算（考验０９的各种材料）和重水反应堆的改进计算。
In this paper, we derive the difference equation of two - dimensional neutron diffusion equation, solve the equation of line over - relaxation (called internal iteration) of difference equation, and give the iteration (called external iteration) formula of fission source term ψ. The effective multiplication factor K eff ) And the convergence criterion of internal and external iteration, describes the approximate process of this solution on the computer. This computer program is used for high-throughput reactor calculations (test 09 for various materials) and for improved calculations of heavy water reactors.