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On the origins and the evolution of the fuel-cladding bonding phenomenon in PWR fuel rods

Ciszak, Clément and Desgranges, Lionel and Garcia, Philippe and Sabathier, Catherine and Fayette, Laurent and Chevalier, Sébastien On the origins and the evolution of the fuel-cladding bonding phenomenon in PWR fuel rods. (2019) Journal of Nuclear Materials, 520. 110-120. ISSN 0022-3115

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Official URL: https://doi.org/10.1016/j.jnucmat.2019.04.015

Abstract

This study proposes a new and detailed description of the fuel-cladding bonding phenomenon occurring in PWR fuel rods. Very early and late bonding states were characterized on specimens of 35.3 GWd.tU−1 moderate burnup and of 64.5 GWd.tU−1 high burnup respectively. Results were then compared with those achieved on a re-created bonded situation obtained on a Zircaloy-4/hyper-stoichiometric UO2+x model materials diffusion couple. These results tend to indicate that a chemical adhesion is probably at the origin of the PWR fuel-cladding bonding. In addition, the progressive formation of ZrO2/UO2 interfacial circumvolutions observed with increasing burnup, which lead to the physical anchorage of ZrO2 and UO2, is likely to lead to their mechanical adhesion. Thus, the in-reactor ZrO2/UO2 bonding could be considered, since the occurrence of the first bonded situations, as an adhesion phenomenon owning two components: an initial chemical progressively strengthened by a second mechanical.

Item Type:Article
HAL Id:hal-03198832
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Université de Bourgogne - UB (FRANCE)
Other partners > Université de Technologie de Belfort-Montbéliard - UTBM (FRANCE)
Laboratory name:
Funders:
Electricité de France - EDF (France) - Framatome (France)
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Deposited On:15 Apr 2021 08:52

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