4-7 November 2019
PSI Auditorium
Europe/Zurich timezone
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Development of a thermo-kinetic model of cations in the mixed oxide of Uranium & Plutonium

6 Nov 2019, 14:30
20m
WHGA/001 (PSI Auditorium)

WHGA/001

PSI Auditorium

Forschungstrasse 11 5232 Villigen PSI Switzerland

Speaker

Prantik Chakraborty (Den-Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), CEA, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France)

Description

The large radial thermal gradient in Sodium-cooled Fast reactors (SFR) leads to mass transport of uranium and plutonium in the fuel pellet. Knowledge of self-diffusion of all these elements in (U,Pu)O2 fuel is therefore of utmost importance for the prediction of its in-pile behaviour. Very few experimental data, however, are available on self-diffusion in this material.

In the inception of the study, the lack of experimental measurements is circumvented by the so-called ‘cBΩ’ model. The cBΩ model has been utilized to describe the plutonium self-diffusion in MOx using the bulk properties of the fuel and a single fitting-parameter.

Using these results of cBΩ and the experimental data together, a plutonium mobility database has been composed for the MOx fuel. Hence, by implementing this database, a detailed model has been developed to describe the plutonium self-diffusion in MOx using the state-of-art DICTRA code.

The self-diffusion of Uranium in MOx has not been experimentally measured yet. However, by implementing the thermodynamic definition of MOx and the plutonium self-diffusion model, developed under this work, the self-diffusion of Uranium has been estimated from the experimentally measured cation inter-diffusion coefficient data. Hence, a similar Uranium mobility database for MOx has been also composed. Further, using this database, a model for the uranium diffusion in MOx has been developed.

Both the models for self-diffusion of Uranium and Plutonium has been validated against the experimental results. In combination of these two models of cation self-diffusion in MOx, the inter-diffusion profile of cations has been simulated.

Primary authors

Prantik Chakraborty (Den-Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), CEA, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France) Dr Christine Guéneau (Den-Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), CEA, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France) Dr Alain Chartier (Den-Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), CEA, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France)

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