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Vitrification de déchets nucléaires de démantèlement riches en Mo, P et Zr. Etude structurale et microstructurale de leur incorporation dans un verre aluminoborosilicaté.

Abstract : This work belongs to the DEM’N’MELT project, which is dedicated to the vitrification of intermediate or high level radioactive wastes coming from the dismantling of nuclear facilities. The waste compositions of this study, rich in P2O5, MoO3 et ZrO2 which activity is mainly due to 137Cs are close to the ones of the shutdown UP1 facility (Marcoule). Their main feature is the variability of their composition. This work objective is to study the incorporation of these wastes in an aluminoborosilicate glass rich in alkali oxides at 1100 °C.The first part of the study will be dedicated to a system close to the industrial one (11 oxides). It highlights that MoO3 and P2O5 are the main waste constituents responsible for phase separation or crystallization. Moreover, molybdate crystalline phases can contain Cs. ZrO2 is incorporated in the glassy matrix without leading to heterogeneities.Then, a simplified system (6-7 oxides) is studied along with the structural and microstructural incorporation mecanisms of P2O5 and MoO3. These oxides are first considered alone and then added simultaneously. This second study highlights that P et Mo mainly lead to the formation of entities isolated from the glassy network and that their simultaneous addition increases the crystallization tendency.
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Sophie Achigar. Vitrification de déchets nucléaires de démantèlement riches en Mo, P et Zr. Etude structurale et microstructurale de leur incorporation dans un verre aluminoborosilicaté.. Matériaux. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLC019⟩. ⟨tel-03550060⟩

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