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Speciation and release kinetics of the fission products Mo, Cs, Ba and I from nuclear fuels in severe accident conditions

Abstract : A speciation and release kinetics study of the gaseous fission products freed from nuclear fuels in conditions of severe accident (temperature range 1300°C – 2500°C) as a function of the applied thermodynamic conditions is carried out using the experimental feedback collected at CEA within the VERCORS and VERDON programs. The nature of the major species involved are deduced from the analysis of the specific features of the Cs-Mo-Ba-I-O chemical system in the composition range of irradiated nuclear fuels. Stable gaseous Cs and Ba molybdate species, i.e. $Cs_2Mo_2O_7$ (g) and $BaMoO_4 (g)$, clearly predominates in oxidising conditions, which contributes to increase significantly the released fraction of molybdenum as compared to reducing conditions. An analytical model accounting for thermo-chemistry in the release rate of chemically reactive elements is applied to estimate the release of Cs, I, Mo and Ba in severe accident conditions. Good agreement is achieved with on-line measurements
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https://hal-cea.archives-ouvertes.fr/cea-02400191
Contributor : Bibliothèque Cadarache <>
Submitted on : Monday, December 9, 2019 - 3:08:47 PM
Last modification on : Tuesday, April 28, 2020 - 11:28:14 AM
Long-term archiving on: : Tuesday, March 10, 2020 - 11:00:12 PM

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  • HAL Id : cea-02400191, version 1

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Ch. Riglet-Martial, J. Sercombe, Y. Pontillon. Speciation and release kinetics of the fission products Mo, Cs, Ba and I from nuclear fuels in severe accident conditions. WRFPM 2018, Sep 2018, Prague, Czech Republic. ⟨cea-02400191⟩

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