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在核电站的反应性事故分析中,必须对中子动力学方程进行求解。它是一组典型的刚性常微分方程组,用一般方法求解时只能选用很小的时间步长。本文介绍的通量权重法,可以选用较大的时间步长求解。该方法比经典的龙格-库塔法和一些其它方法先进,可将计算步长提高1～3个数量级,从而节省大量的计算时间。用通量权重法编写的求解中子动力学方程程序,既可用于反应性事故(包括弹棒事故)分析计算,也可用于训练模拟器的实时模拟。
In the reactor accident analysis, the neutron kinetic equations must be solved. It is a set of typical rigid ordinary differential equations, which can only be selected by a very small time step when solving with the general method. This article describes the flux weight method, you can choose a larger time step to solve. This method is more advanced than the classical Runge-Kutta method and some other methods, which can improve the calculation steps by 1 to 3 orders of magnitude, thus saving a lot of computation time. The flux neutron kinetic equation program written by the flux weight method can be used in the analysis and calculation of reactive accidents (including the bomb accident) as well as the real-time simulation of the training simulator.