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              <p>We consider in this study three uranium dioxide ceramics whose porous network varies noticeably according to the manufacturing conditions. This porous network is made up of a fine and elongated porosity which is called inter-granules pores but also of occluded pores which can be highlighted at a much smaller scale.Thermal diffusivity measurements have been performed by a flash laser method on these ceramics at 50°C under different atmospheres but also up to 500°C conditions under an argon and dihydrogen atmosphere. These measurements have shown marked differences in the thermal conductivities of these three ceramics, in particular a sharp degradation when the open porosity increases is reported. To understand the influence of these two families of porosity on the effective conductivity, a double-scale model has been developed. The effect of occluded porosity is approximated using the Maxwell (1873) model. The effect of the inter-granules porosity is evaluated by full-field numerical simulations performed on synthetic microstructures generated by the optimization process described in Moutin (2023) . Comparisons of model predictions to experimental results confirm the predominant role of the inter-granules porosity on the effective conductivity. Besides, it is shown that the Knudsen effect must be taken into account to accurately predict environment effect at 50°C. Finally, the simulated conductivity of the ceramics are shown to predict temperatures effects up to 500°C</p>
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