“华龙一号”取消二次中子源研究

The Removal of Secondary Neutron Source in HPR1000

对乏燃料组件中的二次中子源进行了计算与分析,获得了中子源强度随功率、燃耗、停堆时间等的变化规律,通过这些规律获得了近似且保守的中子源强度,分析出第2循环是中子源项最小的堆芯,并对第2循环进行了装料计数率分析,得到了装料探测器计数率。并对二次中子源产氚进行了计算,计算结果表明,基于“华龙一号”的无二次中子源启动方案满足《压水堆核电厂反应堆首次装料试验》(EJ/T 1114-2000)的要求且有降低氚排放及节省投资等优点。

The secondary neutron source in the spent fuel assembly is calculated and analyzed,and the variations of neutron source intensity with power,burn-up,and shutdown time are obtained.And it is analyzed that the second cycle is the core with the smallest neutron source term,and the loading counting rate analysis is performed on the second cycle to obtain the loading detector counting rate.Calculations are conducted on the production of tritium from a secondary neutron source,and the results show that the removal of secondary neutron source in HPR1000 meet the requirements of the initial loading test for pressurized water reactor of nuclear power plant(EJ/T 1114-2000),and has the advantages of reducing tritium emissions and saving investment.