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Article Dans Une Revue Journal of Nuclear Materials Année : 2015

Influence of γ-irradiation on the transport kinetics of hydrogen in pre-transition oxidized Zircaloy-4 at room temperature

Résumé

In a context of nuclear fuel reprocessing, the free-of-fuel hulls and ends of cladding tubes are compacted. The possibility of hydrogen degasing or absorption from/into these tubes has been studied with and without gamma irradiation at 293 K by means of deuterium as isotopic tracer for hydrogen. Under irradiation, as without, the hydrides present in the Zircaloy-4 hulls seem stable. The oxide layer present at the surface of the hulls allows a slow diffusion of deuterium, and the irradiation appeared to have no specific effect on the diffusion process: in both cases, hydrogen diffusion coefficients of the order of 5·10−18 cm2 s−1 have been found. The subsurface activity of deuterium is increased by one order of magnitude at least under irradiation, probably due to an activation of the dissociation/absorption kinetic steps.
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Dates et versions

hal-01407464 , version 1 (02-12-2016)

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Frantz A. Martin, Vincent Dauvois, Stéphane Esnouf, Chloé Fourdrin, François Jomard, et al.. Influence of γ-irradiation on the transport kinetics of hydrogen in pre-transition oxidized Zircaloy-4 at room temperature. Journal of Nuclear Materials, 2015, 465, pp.615-625. ⟨10.1016/j.jnucmat.2015.06.049⟩. ⟨hal-01407464⟩
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