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Study of the Leaching Behaviour of Sintered UO2 in Groundwater Using Nuclear Microprobe Techniques

Published online by Cambridge University Press:  15 February 2011

Patrick Trocellier
Affiliation:
Cea-Cnrs, Laboratoire Pierre Süe, Centre d’Etudes de Saclay, 91191 Gifsur Yvette (France)
Jean Paul Gallien
Affiliation:
Cea-Cnrs, Laboratoire Pierre Süe, Centre d’Etudes de Saclay, 91191 Gifsur Yvette (France)
Christelle Cachoir
Affiliation:
Cea-Cnrs, Laboratoire Pierre Süe, Centre d’Etudes de Saclay, 91191 Gifsur Yvette (France)
Pierre Toulhoat
Affiliation:
Cea, Section de Géochimie (DCC/DESD/SESD), Centre d’Etudes de Fontenay aux Roses, 92265 Fontenay aux Roses (France).
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Abstract

The leaching behaviour of sintered UO2 pellets has been studied in synthetic groundwater at 96 °C under strictly controlled conditions (CO2 partial pressure, O2 partial pressure, pH and redox potential). Results obtained in oxidizing conditions (O2 content varying from 5 to 25 ppm) show a strong initial uranium release in solution during the first five days and a solubility control essentially driven by the growth of U(VI) species such as oxides, hydrates and carbonates. Results obtained in reducing conditions (use of a mineralogical buffer of Ni(0)/Ni(ll) with E0 = -0.257 Volts) show a very weak uranium release in solution close to 10-11 mole/l and a solubility control essentially driven by the formation of U(IV) compounds such as coffinite or uraninite.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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References

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