Simulations of a simplified LOCA scenario with a non-equilibrium homogeneous model

Olivier Hurisse (1) , Lucie Quibel (1, 2)

1 EDF - EDF
2 IRMA - Institut de Recherche Mathématique Avancée

The LOCA scenario involves strong and sudden depressurization of hot liquid water, which generates strong pressure waves propagating through the primary circuit devices. Due to these severe conditions , the induced vaporization of the liquid water occurs under thermodynamical conditions that may be far from the thermody-namical equilibrium. The accurate numerical prediction of this kind of accidental scenarii, and of their potential consequences, then requires numerical tools that are able to deal with non-equilibrium two-phase thermodynamics. A specific module is being developed by EDF Lab Chatou in the framework of Code Saturne in order to assess such severe accidental situations involving liquid-vapor flows. The aim of this paper is to present the model and the numerical schemes that have been developed. Some numerical results are also compared to the experimental measurements obtained thanks to the SUPERCANON facility, which allowed to reproduce the first stage of a LOCA scenario.

Mots clés: LOCA; non-equilibrium thermodynamics; two-phase flows; mass transfer

Domaines: Equations aux dérivées partielles [math.AP]

Olivier Hurisse, Lucie Quibel. Simulations of a simplified LOCA scenario with a non-equilibrium homogeneous model. 2020. ⟨hal-02901408⟩