Thermodynamical calculation of phase equilibria in a quinary oxide system of first interest in nuclear energy field UO2-ZrO2-SiO2-CaO-Al2O3 - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 1991

Thermodynamical calculation of phase equilibria in a quinary oxide system of first interest in nuclear energy field UO2-ZrO2-SiO2-CaO-Al2O3

Résumé

As part of a study on nuclear reactor safety, on request from the Institute for health and Nuclear Safety (IPSN) of the Commissariat à l'Energie Atomique, THERMODATA is presenting a model of the thermodynamical properties of an oxide mixture called "corium" obtained in the unlikely event of a severe accident in a nuclear power plant, if the reactor melts through the vessel and slumps into the concrete reactor cavity. The aim of this thermodynamic work is to allow the calculation of the equilibrium state of the corium, i.e. to determine the nature and the composition of the coexisting phases at thermodynamic equilibrium, as well as the constituent activities for given compositions and temperatures or the liquidus and solidus temperatures of the corium. The present paper deals with the optimization results of the thermochemicl properties of ten limiting quasi-binary systems ; this is a necessary step to calculate the thermodynamical equilibrium of the five component oxide system (UO2-ZrO2-SiO2-CaO-Al2O3). These five oxides are the main components of the oxide pahse of the corium (Fe oxide will be added later).

Domaines

Chimie Matériaux
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Dates et versions

hal-01899115 , version 1 (19-10-2018)

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  • HAL Id : hal-01899115 , version 1

Citer

Olivier Relave, Pierre-Yves Chevalier, Bertrand Cheynet, Gérard Cenerino. Thermodynamical calculation of phase equilibria in a quinary oxide system of first interest in nuclear energy field UO2-ZrO2-SiO2-CaO-Al2O3. Proceedings of the International Conference User Aspects of Phase Diagrams, Jun 1990, Petten, Netherlands. pp.IBSN 0 901 462 91 8. ⟨hal-01899115⟩

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