燃料棒芯块中Kr、Xe的低温释放机理

Low-Temperature Release Mechanism of Kr and Xe in Fuel Pellet

在Wise反冲机理微观模型的基础上,考虑芯块倒角的影响,给出了倒角表面平均反冲效率的计算模型;击出机理参考Olander的理论;由此建立了一个更为精细的裂变气体低温释放微观模型。使用新建模型进行计算的结果显示,倒角表面的平均反冲效率约为圆柱体芯块表面的两倍;当倒角的表面积与圆柱体芯块表面积相比不可忽略时,裂变气体反冲释放份额的计算应考虑倒角的影响。

The low-temperature release mechanism of fission gas Kr and Xe has been studied.A model has been developed to calculate the pellet chamfer surface average release efficiency,based on the recoil micro-mechanism model of Wise,by considering the effect of pellet chamfer.After that,a more detailed micro-mechanism model of fission gas low-temperature release has been developed,using the knockout micro-mechanism model of Olander for reference,which can be applied to the final fission gas low-temperature release model.