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Extension to severe accident investigations: Investigation of MOX/steel interaction

Andrea Quaini 1 Christine Gueneau 1 Alan Brunel Luca Casini Lelio Luzzi Luka Vlahovic Davide Robba 
1 LM2T - Laboratoire de Modélisation, Thermodynamique et Thermochimie
SCCME - Service de la Corrosion et du Comportement des Matériaux dans leur Environnement : DEN/DPC/SCCME
Abstract : In the frame of severe accident studies, the overheated nuclear MOX fuel may interact with the steel alloy cladding leading to the formation of a liquid phase at temperature well below the melting temperature of the fuel itself. Moreover, the presence of a miscibility gap in the liquid phase in the U-O, Pu-O and Fe-O binary sub-systems that extends in the U-Fe-O, Pu-Fe-O and U-Pu-O ternary systems may induce an accumulation of fissile elements in a specific region of the damaged reactor, with the risk of re-criticality. This work reports the experimental results obtained at JRC on the PuO2-Fe3O4 system (liquidus and solidus) and at CEA on the Fe-U-O system (miscibility gap in the liquid phase). The JRC laser heating setup was improved to account for oxygen potential effects on liquidus/solidus transitions. At CEA, a novel experimental setup was developed to obtain new data in the Fe-U-O liquid miscibility gap. These experimental results have been used to check on the quality of the existing thermodynamic description of the Fe-U-O system and to assess the thermodynamic model of the Pu-Fe-O system using the CALPHAD method. Thermodynamic calculation performed using the U-Pu-Fe-O thermodynamic database will allow to predict the formation of the liquid phases during a severe accident.
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Submitted on : Monday, January 31, 2022 - 2:00:19 PM
Last modification on : Wednesday, February 2, 2022 - 3:33:31 AM


  • HAL Id : cea-03549455, version 1


Andrea Quaini, Christine Gueneau, Alan Brunel, Luca Casini, Lelio Luzzi, et al.. Extension to severe accident investigations: Investigation of MOX/steel interaction. INSPYRE Final Workshop, Nov 2021, Marseille, France. ⟨cea-03549455⟩



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