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Modelling of liquid phase segregation in the Uranium–Oxygen binary system

Abstract : In the uranium–oxygen (U–O) binary system, the existence of a miscibility gap induces the segregation between two immiscible liquid phases at thermodynamic equilibrium: an oxidic phase and a metallic one. Within the framework of severe accidents in a Light Water Reactor (LWR), the knowledge of in-vessel corium (U–O–Zr-steel system) behaviour and the associated vessel failure risk are of prime interest. The corium pool configuration plays a key role on the heat flux distribution and therefore on the vessel integrity. A coupled thermochemistry-thermalhydraulics model is needed for investigating the stratification kinetics of a corium pool. The work presented here is a first step in the development of such a model, and is focused on the modelling of the kinetics of liquid phase segregation in the U–O binary system. With this aim, we have developed a Cahn–Hilliard model, derived from a free energy functional, for investigating the liquid phase segregation. The present paper discusses the coupling of the transient Cahn–Hilliard solver with a U–O CALPHAD thermodynamic database and the parameterization of such a kinetic model.
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Submitted on : Friday, November 29, 2019 - 8:43:56 AM
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C. Cardon, R. Le Tellier, M. Plapp. Modelling of liquid phase segregation in the Uranium–Oxygen binary system. Calphad, 2016, 52, pp.47-56. ⟨10.1016/j.calphad.2015.10.005⟩. ⟨cea-02385735⟩



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