长期低功率运行对燃料棒PCI性能影响分析

Analysis of the Impact of Extended Low Power Operation on the Fuel RodPCI Performance

本文基于FUPAC软件对长期低功率运行下燃料棒包壳的PCI性能进行了计算分析,分析结果表明,发生II类瞬态时,长期低功率运行工况下的包壳应变能密度将明显高于正常运行工况,并导致燃料棒包壳PCI失效裕量的降低。受长期低功率运行模式的影响,长期低功率运行的时间越长,长期低功率运行的功率越低,燃料棒包壳的应变能密度越大,包壳PCI失效裕量越小。

The PCI performance of fuel rod cladding under extended low power operation is analysised by FUPAC in this article.The analysis results indicate thatthe cladding strain energy density under extended low power operation in the transient II will be significantly higher than that under normal operation condition,which leads to a decrease in the PCI failure margin of the fuel rod cladding.Affected by the extended low power operation mode,longertime and lower power of extended low power operation will result in a greater strain energy density of the fuel rod cladding,and reduce the cladding PCI failure margin.