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An auto-catalytic mechanism to explain the fission gas release between 500°c and 800°c on UO$_2$ irradiated fuel

Abstract : A new mechanism is proposed to explain the FGR by burst in the nuclear fuel. A simplified two-parameter model for describing aggregation kinetics can be borrowed from the Finke-Watzky mechanism. The comparisons between the model and annealing tests show a good agreement. This FGR mechanism is possibly connected to the defects concentration created by alpha self-irradiation. It's necessary to complete this investigation with other trials using model materials to validate this possible phenomenon.
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https://hal-cea.archives-ouvertes.fr/cea-02437063
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Submitted on : Monday, January 13, 2020 - 3:17:58 PM
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  • HAL Id : cea-02437063, version 1

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G. Brindelle, Y. Pontillon, H. Capdevila, L. Desgranges, G. Baldinozzi. An auto-catalytic mechanism to explain the fission gas release between 500°c and 800°c on UO$_2$ irradiated fuel. Numat2016, Nov 2016, Montpellier, France. ⟨cea-02437063⟩

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