Oxidation behaviour of unirradiated sintered UO2 pellets and powder at different oxygen partial pressures, above 350°C

Oxidation behaviour of unirradiated sintered UO2 pellets and powder at different oxygen partial pressures, above 350°C

The oxidation of sintered UO2 pellets and powder into U3O8 has been studied by thermogravimetry at 370°C, under controlled oxygen partial pressures (PO2 ranging from 2-40 kPa). Sigmoidal curves of oxidation weight gain were measured for both pellet and powder test samples. The rate of oxidation incr...

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Veröffentlicht in:Journal of nuclear materials 2006-05, Vol.354 (1-3), p.85-93
Hauptverfasser: Valdivieso, Françoise, Pijolat, Michèle, Francon, V., Byasson, François, Feugier, A., Peres, Véronique
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Chemical and Process Engineering
Engineering Sciences
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container_end_page 93
container_issue 1-3
container_start_page 85
container_title Journal of nuclear materials
container_volume 354
creator Valdivieso, Françoise
Pijolat, Michèle
Francon, V.
Byasson, François
Feugier, A.
Peres, Véronique
description The oxidation of sintered UO2 pellets and powder into U3O8 has been studied by thermogravimetry at 370°C, under controlled oxygen partial pressures (PO2 ranging from 2-40 kPa). Sigmoidal curves of oxidation weight gain were measured for both pellet and powder test samples. The rate of oxidation increased as the oxygen partial pressure increased. It has been shown, by simultaneous TG-DSC, that the reaction proceeds in a pseudo steady state. An experimental methodology based on temperature or PO2 jumps has shown that the assumption of a rate-limiting step is validated, and a mean value of activation energy for the formation of U3O8 of 103 kJ.mol-1 was estimated.
doi_str_mv 10.1016/j.jnucmat.2006.02.096
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Engineering Sciences
title Oxidation behaviour of unirradiated sintered UO2 pellets and powder at different oxygen partial pressures, above 350°C
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