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Behaviour of fission products in UO2

Experimental characterization of the Cs-I-UO2 model system at high temperature

Journal Article (2023)
Author(s)

M. Rochedy (CEA Cadarache, TU Delft - Applied Sciences, TU Delft - Dean)

V. Klosek (CEA Cadarache)

C. Riglet-Martial (CEA Cadarache)

C. Onofri-Marroncle (CEA Cadarache)

D. Drouan (CEA Cadarache)

D. Reyes (CEA Cadarache)

P. Bienvenu (DIF)

I. Roure (DIF)

M. Cabié (Aix Marseille Université)

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Research Group
RST/Reactor Physics and Nuclear Materials
DOI related publication
https://doi.org/10.1016/j.jnucmat.2023.154450 Final published version
More Info
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Publication Year
2023
Language
English
Research Group
RST/Reactor Physics and Nuclear Materials
Bibliographical Note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Journal title
Journal of Nuclear Materials
Volume number
581
Article number
154450
Downloads counter
323
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Institutional Repository
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Abstract

The interactions of iodine and caesium in UO2 have been investigated. For this purpose, implanted UO2 samples were thermally treated (4h at 900°C or 1h at 1200°C) under controlled atmosphere (0.03% H2O/H2) and then characterized by several experimental techniques for their structural and chemical studies. Thermodynamic calculations were also performed in order to optimize heat treatment conditions before performing tests, and to help in the interpretation of results afterwards. The sample characterizations after thermal treatments reveal the presence of bubbles and precipitates (mean diameter around 10 - 20 nm) and have allowed to clearly identify the presence of CsI in these bubbles which is in agreement with the calculations. The chemical form of the observed precipitates is not well defined yet, due to the lack of experimental reference spectra, but they consist very likely of caesium uranates, as predicted by the thermodynamic calculations.

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