摘要 : Uncertainty of effective delayed neutron fraction βeff is evaluated in terms of three quantities; uncertainties of the basic delayed neutron constants, energy dependence of delayed neutron yield V~m-d in the low energy side below ... 展开 Uncertainty of effective delayed neutron fraction βeff is evaluated in terms of three quantities; uncertainties of the basic delayed neutron constants, energy dependence of delayed neutron yield V~m-d in the low energy side below about 50 keV and in the high energy side above about 4 MeV, and the uncertainties of the fission cross sections of fuel elements. The uncertainty of βeff due to the delayed neutron yield is expressed by a linearized formula assuming that the delayed neutron yield does not depend on the incident energy, and the energy dependence is supplemented by using the detailed energy dependence proposed by D'Angelo and Filip. 收起