To assess the safety of the deep geological disposal that would store the spent nuclear fuel (SNF), studies are centred on the SNF behaviour under repository conditions. UO2, which is the most common compound of SNF matrix, is highly sensitive to the redox potential and it could be oxidised to more soluble phases, enhancing the liberation of harmful radionuclides. Among fission products in the SNF, e-particles (nanoparticles) are believed to play an important role avoiding the oxidation. Consequently, scientists are testing efficient and low cost methodologies for the preparation of novel materials by incorporation of nanoparticles into bulk components. In this communication we present the methodology for preparation of non-irradiated UO2 doped with Pd Nanoparticles (Pd-NPs), as an analogue of e-particles present in the SNF. Pd-NPs doped UO2 samples were characterised by high resolution electron microscopy to identify the presence, the morphology and distribution of the nanoparticles.

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