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使用ORIGEN2软件计算了西安脉冲堆2 MW满功率连续运行和3种断续运行至燃耗末期的堆芯放射性积存量;选取计算结果中最大积存量4.13×1016Bq,辅以燃料元件包壳全部破损的极端事故假设和保守地释放模型计算放射性物质环境释放量。结果表明,在1 min内的放射性裂变产物释放高达41.0%,有效释放时间大概持续5 min,最大环境释放量为4.54×1012Bq。
The ORIGEN2 software was used to calculate the 2 MW full-power continuous operation of Xi’an Pulsed Reactor and three kinds of core radioactive deposits that were intermittently operated to the end of burnup. The maximum accumulative amount in the calculation results was 4.13 × 1016Bq, Extreme Accident Assumptions and Conservatively Released Model to Calculate Environmental Release of Radioactive Material. The results showed that the release of radioactive fission products was as high as 41.0% in 1 min, the effective release time was about 5 min, and the maximum environmental release was 4.54 × 1012 Bq.