本文讲述了用多群能谱程序和少群临界程序计算缓发中子有效份额的计算方法,并给出一个动力堆和一个零功率堆的计算结果。一、定义缓发中子份额的多少对堆的动态特性有很大的影响。由于缓发中子的能量比瞬发中子低,一个缓发中子与一个瞬发中子在增殖过程中起的作用就不一样,这种差别在点堆 This paper describes a method for calculating the effective fraction of delayed neutrons by using a multistage energy spectrum program and a few critical steps and gives the calculation results of a power reactor and a zero power reactor. First, define how much of the delayed neutron fraction has a significant impact on the dynamics of the heap. Since the energy of delayed neutrons is lower than that of instant neutrons, the effect of one slow-releasing neutron and one immediate-neutron on proliferation is different,