核电厂退役源项分析

Research of Source Term for NPP Decommissioning

为指导核电厂退役过程中的环境影响评价和人员辐射防护,需要对退役过程中的放射性源项进行分析。通过对退役三个阶段的放射性源项产生机理进行研究,分析得出堆芯周围金属结构的活化源项,以及沉积在主辅回路的活化腐蚀产物,是退役源项的主要贡献,典型放射性核素包括60 Co、63 Ni、110m Ag等。给出了基于中子辐照史的活化源项计算方法,可用于退役源项的定量估算。

For guiding the environmental assessment and radiation protection,radioactive source terms in the decommissioning should be analyzed.According to the mechanism of source terms in the 3 steps in decommissioning,the neutron activated production surrounding core and activated corrosion product deposited on the primary and auxiliary systems are the major part of source terms in the decommissioning.The typical nuclides including 60 Co,63 Ni,110m Ag,etc.The calculation method is proposed based on the history of neutron irradiation,which can used for quantitative estimation of source terms in the decommissioning.