压水堆核电站氚排放源项计算模型参数灵敏度分析

Sensitivity Analysis for Calculation Model Parameters of Tritium Releases Source for PWR

氚是核电站运行过程中向环境中排放较大的放射性核素之一,控制核设施中氚的产生和排放量越来越引起人们的重视。本文通过分析核电站产生氚的主要途径,建立了5种产氚途径的7个计算模型,并对计算模型中重要参数的灵敏度进行了分析。结果表明:在计算氚的产生量时,参数的灵敏度依次是~7Li所占百分比、等效满功率天数、初始锂浓度、氚从可燃毒物棒中释放到主冷却剂中份额、氚从燃料释放到冷却剂中份额;~7Li所占百分比对氚的产生量特别灵敏,等效满功率天数对所有途径的产氚量都有影响。

Tritium is the large amount of radionuclide released from nuclear power plant under normal operation. It has attracted more and more attentions to control tritium emissions. By analyzing tritium release pathways of primary loop, seven computational model of five release pathways were established, and sensitivity to most important parameters of models were analysised The results show： the sensitivity of model parameters followed by the percentage of 7Li, effective full power days （EEPD）, initial concentration of lithium, tritium release fraction from the combustible poison rods, tritium release fraction from the fuel rods. The percentage of 7Li was highly sensitive to tritium production, EEPD had an impact on all tritium release pathways.