Abstract This paper aims to modify the Lucuta et al. thermal conductivity model of irradiated UO2 fuel to include the high burnup structure effect. The porosity factor of Lucuta et al. model is modified to account for the porosity evolution with increasing burnup. The radiation damage factor of Lucuta et al. model is modified to take account of the removal of defects from the fuel matrix of the rim region. The dissolved fission products factor of Lucuta et al. model is modified to account for the depletion of fission gas atoms from the fuel matrix in the rim region. The effect of grain boundaries thermal resistance on the thermal conductivity is also accounted for as a new multiplier to the Lucuta et al. correlation. The reasonable agreement is seen from the comparison of predicted thermal conductivity with the measured data at high burnup. The conducted parametric study shows the impact of the key parameters on the calculated thermal conductivity.

中文翻译：

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在 UO2 燃料热导率模型中包含高燃耗结构效应

摘要 本文旨在修改 Lucuta 等人的论文。辐照 UO2 燃料的热导率模型，包括高燃耗结构效应。Lucuta 等人的孔隙率因子。模型被修改以解释随着燃耗增加的孔隙度演变。Lucuta 等人的辐射损伤因子。修改模型以考虑从边缘区域的燃料基质中去除缺陷。Lucuta 等人的溶解裂变产物因子。对模型进行了修改，以解释边缘区域燃料基质中裂变气体原子的消耗。晶界热阻对热导率的影响也被认为是 Lucuta 等人的新乘数。相关性。从预测的热导率与高燃耗时的测量数据的比较中可以看出合理的一致性。