| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Gossé, S.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2018High temperature corrosion phenomena during a nuclear severe accident - The corium-concrete interaction
- 2018Thermodynamic Assessment of the Fe-Te System. Part I: Experimental studycitations
- 2017Thermodynamic investigation of the Cr-O-U and Cr-O-Zr systems
- 2017Thermodynamic modelling of key metallic sub-systems for the treatment of mid-level wastes
- 2017Thermodynamic modelling of key metallic sub-systems for the treatment of mid-level wastes
- 2017The TAF-ID database Application calculations to severe accidents and irradiated fuel
- 2016Experimental and thermodynamic calculations results on pwr and srf corium subsystems
- 2016Thermodynamic assessment of the PdRhRu system using calphad and first-principles methodscitations
- 2016High temperature experimental contribution to the thermodynamic modeling of corium pools
- 2016High temperature experimental contribution to the thermodynamic modeling of corium pools
- 2015Experimental investigation and thermodynamic modelling of the in-vessel corium for severe accident studies in PWR reactors
- 2015Experimental investigation and thermodynamic modelling of the in-vessel corium for severe accident studies in PWR reactors
- 2015Experimental study and thermodynamic modelling of corium mixtures Application to severe accidents in Pressurized Water Reactors
- 2015Modélisation thermodynamique de l'interaction entre le verre et les phases molybdates.
- 2012Mechanism of RuO2 Crystallization in Borosilicate Glass: An Original in Situ ESEM Approachcitations
- 2011Thermodynamic study of the uranium–vanadium systemcitations
Places of action
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document
Modélisation thermodynamique de l'interaction entre le verre et les phases molybdates.
Abstract
Fission products and actinides arising from the spent UOX fuel reprocessing are vitrified in borosilicate glass matrices. Among the fission products, platinum-group metals (Pd-Rh-Ru) exhibit very low solubility and partly precipitate as metal or oxide phases in the glass melt. Molybdenum can form molybdate phases which are known to precipitate in the glass as a complex molybdate phase called yellow phase. These molybdate phases may induce modifications of the physico-chemistry of the glass melt and have an impact on the final glass confinement properties.To understand the relative stability of these phases depending on both temperature and oxygen potential of the melt, a thermodynamic database is being developed using the Calphad method.This database includes the metallic and oxide complex platinoid system and the interactions with tellurium Pd-Rh-Ru-Te-(O). To consider the formation of molybdates, the CaO-MoO$_3$ and of Na$_2$O-MoO$_3$ pseudo binary systems are taken into account. The modeling of Na$_2$O-SiO$_2$ and of the ternary SiO$_2$-Na$_2$O-MoO$_3$ system was carried out based on the literature and on new experiments performed at the CEA.Using this tool, the thermodynamic state of the molybdate phases is calculated as a function of temperature and composition and the ruthenium redox behavior is predicted as a function of temperature and oxygen pressure in the melt. This study throws new light on the interactions between molybdenum and platinum-group metals with the glass melt during the vitrification process of high level nuclear waste.