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介绍了一种适合于求解反应堆中子动力学方程的刚性限制法。该方法的主要特点是引入一个辅助函数ｗ（ｔ）而将刚性分离，使其仅在解发中子方程中存在刚性，而该方程可解析积分，因此，中子动力学方程的求解步长可取得较大。文中给出了几种反应性扰动下，采用该方法的计算结果与精确解的比较。并将该法用于秦山二期核电站反应堆功率控制系统的瞬态计算，结果令人满意。５６０秒瞬态过程，在ＨＰ－２８６微机上的计算耗时仅８０秒左右，说明在微机上可实现核动力装置的实时甚至超实时仿真。
A rigid limit method suitable for solving reactor neutron kinetic equations is introduced. The main feature of this method is the introduction of an auxiliary function w (t) that separates the stiffness so that it has rigidity only in the solution neutron equation, which can be solved for the integral. Therefore, the solution step of the neutron kinetic equation Can be made larger. In this paper, we give the comparison between the calculated results and the exact solutions under several reactive perturbations. The method is applied to the transient calculation of reactor power control system in Qinshan Phase Ⅱ nuclear power plant with satisfactory results. 560 seconds transient process, the calculation on the HP-286 microcomputer takes only about 80 seconds, indicating that real-time or even real-time simulation of the nuclear power plant can be realized on the computer.