Article Dans Une Revue International Journal of Hydrogen Energy Année : 2021

Rate-limiting step of the deuterium desorption kinetics from Zircaloy-4 oxidized in PWR light primary water

Résumé

This study aims at identifying the rate-limiting step and quantifying the kinetic constants of diffusion and deuterium desorption from a Zircaloy-4 alloy oxidized in light primary water. Secondary Ion Mass Spectrometry deuterium concentration profiles in ZrO2, combined with finite elements simulations, reveal that the deuterium desorption from an oxidized Zircaloy-4 alloy is kinetically controlled by a mixed regime of surface recombination and diffusion in the oxide in the 600 K–1000 K temperature range. At lower temperatures, desorption is controlled by the deuterium diffusion in the oxide layer whereas at higher temperatures the surface recombination reaction dominates.

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hal-03487854 , version 1 (05-01-2024)

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C. Juillet, Marc Tupin, Frantz A. Martin, François Jomard, Quentin Auzoux, et al.. Rate-limiting step of the deuterium desorption kinetics from Zircaloy-4 oxidized in PWR light primary water. International Journal of Hydrogen Energy, 2021, 46 (80), pp.39955-39968. ⟨10.1016/j.ijhydene.2021.09.235⟩. ⟨hal-03487854⟩
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