More than 300 publications have been revised for studying the thermal conductivity and the thermal radiation properties of UO2. The temperature, the porosity, the uranium to oxygen ratio and irradiation effects have an important influence on the thermal conductivity. The thermal conductivity of stoichiometric UO2 with nearly theorectical density is well known up to the melting point with a maximum uncertainity of ± 15%. Relations can be established to calculate the conductivity of porous UO2. The correlation between the conductivity and the Ö/U ratio could not be described analytically but the qualitative dependence is evident. Only a few publications could be found on thermal radiation properties of UO2; most of them are investigating the radiation transport through solid fuel. Emittance data are therefore quite speculative. The total emittance and the spectral emittance might be approximately 0.9, and not significantly dependent on temperature and porosity or surface roughness. 1. Introduction During the last 15 years a great number of investigations concerning thermal conductivity of UO2 has been published. The most important problem is, that this material appears in various forms concerning its chemical and structural properties. Variations in temperature, porosity, impurities and uranium to oxygen ratio as well as
Journal of Non-Equilibrium Thermodynamics – de Gruyter
Published: Jan 1, 1976
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