Long-life pressurized water reactors using a single bumable poison assembly design is not the optimal choice.In order to meet the comprehensive requirements of bumable poisons for reactivity control in long-life pressurized water reactors,this paper conducts a combined study on new bumable poisons with good neutronics characteristics:231Pa2O3,PACS-J,PACS-L,167Er2O3,and 157Gd2O3.The results show that the combination of"fast burnup"and"slow burnup"burnable poisons can achieve better results.For fuel assemblies with"low enrichment",the combination of 231Pa2O3 with PACS-J,PACS-L with 167Er2O3 can be selected;for fuel assemblies with"high enrichment",the combination of 231Pa2O3 with PACS-J,157Gd2O3 with 167Er2O3 can be selected.Therefore,this paper realizes the initial excess reactivity control,smooth release of reactivity,and increased burnup level of long-life pressurized water reactors through the combined design of"fast burnup"and"slow burnup"burnable poisons.
New burnable poisonCombination of burnable poisonsFast burnupSlow burnup
万方数据
维普
