Calculation of Radioactive Inventory of Activated Parts for Nuclear Power Unit and Analysis of Influence Factors

Based on the operation characteristics of the nuclear power unit,the radioactive inventory of activated parts was calculated by ORIGEN2,and the effects of burn-up,operation mode and power change on the radioactive inventory for activated parts were analyzed.The results indicated that the radioactive inventory grew with the increasing of burn-up,and when the actual operation time was longer than the effective operation time,the increasing rate of nuclide activity approximated the burn-up increasing;Radioactive inventory of activated parts was influenced directly by the operation modes of the nuclear power unit,and under same reactor load,operation power and burn-up,the radioactive inventory for non-continuous operation mode is less than that for the continuous operation mode.Effects of operation modes on radioactive inventory reversed with half life of nuclides.Under same burn-up and longer operation time,the effect of operation power change on the radioactive inventory is not obvious.