Stiff problem in the nutron kinetics equation

After taking account of the stiff, the point reactor model can be used for solving the nutron kinetics equations with long time steps, but its result usually is rough due to not considering the space effect. The one-dimensional space-time kinetics method given by this paper has taken account of the space effect, so that the time step, which meets the needs for reaching the stability of solving, is reduced by two orders of magnitude comparing with ones of the point reactor model without considering the space effect