Comparative study of the I-UO2 and Cs-UO2 systems under conditions representative of irradiated fuel

A comparative study of the behaviour of Iodine and Caesium in uranium oxide was conducted. UO 2 samples implanted with Iodine or Caesium underwent thermal treatment (4h at 900°C or 1h at 1200°C) in a controlled atmosphere (Ar+0.03% H 2 O/H 2 ). Thereafter, the samples were analysed using a range of experimental techniques to study their structural and chemical evolution. Additionally, thermodynamic calculations were performed in order to optimize heat treatment conditions before performing tests, and to assist in the interpretation of results afterwards. The sample characterizations after thermal treatments reveal the following differences in the behaviour of Iodine and Caesium in UO 2 during heat treatment: i) precipitates are mainly observed in the case of samples implanted with Iodine, in contrast to Cs, where bubbles are mainly observed and ii) a very high release rate in the case of Caesium, unlike Iodine.

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Publication Details

Journal
Journal of Nuclear Materials
Published
2025-11-29
DOI
https://doi.org/10.1016/j.jnucmat.2025.156348
Primary Topic
Nuclear Materials and Properties
Type
article
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article

Comparative study of the I-UO2 and Cs-UO2 systems under conditions representative of irradiated fuel

M.A. Pinault-Thaury, Vincent Klosek, I. Roure, M. Rochedy et al.
Journal of Nuclear Materials
Nuclear Materials and Properties
article

Comparative study of the I-UO2 and Cs-UO2 systems under conditions representative of irradiated fuel

M.A. Pinault-Thaury, Vincent Klosek, I. Roure, M. Rochedy, Martiane Cabié, Lucia Amidani, J. Léchelle, Ph. Bienvenu, D. Drouan, C. Onofri-Marroncle, Chantal Martial, David Reyes, X. Ilitis
article en

Abstract

A comparative study of the behaviour of Iodine and Caesium in uranium oxide was conducted. UO 2 samples implanted with Iodine or Caesium underwent thermal treatment (4h at 900°C or 1h at 1200°C) in a controlled atmosphere (Ar+0.03% H 2 O/H 2 ). Thereafter, the samples were analysed using a range of experimental techniques to study their structural and chemical evolution. Additionally, thermodynamic calculations were performed in order to optimize heat treatment conditions before performing tests, and to assist in the interpretation of results afterwards. The sample characterizations after thermal treatments reveal the following differences in the behaviour of Iodine and Caesium in UO 2 during heat treatment: i) precipitates are mainly observed in the case of samples implanted with Iodine, in contrast to Cs, where bubbles are mainly observed and ii) a very high release rate in the case of Caesium, unlike Iodine.

Journal of Nuclear MaterialsVol. 620
Centre National de la Recherche Scientifique (FR), Université de Versailles Saint-Quentin-en-Yvelines (FR), Aix-Marseille Université (FR), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Université Paris-Saclay (FR), European Synchrotron Radiation Facility (FR), CEA Cadarache (FR), École Polytechnique Fédérale de Lausanne (CH)
Openalex Percentile: Top 69%
Nuclear Materials and Properties
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