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Diffusion thermique et sous irradiation du chlore dans le dioxyde d'uranium

Abstract : This work concerns the study of the thermal and radiation enhanced diffusion of 36Cl in uranium dioxide. We simulated the presence of 36Cl by implanting a quantity of 37Cl comparable to the impurity content of chlorine in UO2. In order to evaluate the diffusion properties of chlorine in the fuel and in particular to assess the influence of the irradiation defects, we performed two kinds of experiments:
- the influence of the temperature was studied by carrying out thermal annealings in the temperature range 900 - 1300°C; we showed that implanted chlorine was mobile from temperatures as low as 1000°C and determined a thermal diffusion coefficient D1000 °C around 10^(-16) cm^2s^(-1)
- the influence of the irradiation by fission products were studied by irradiating the samples with 127I (energy of 63.5 MeV). We could determine that the diffusion of the implanted chlorine under irradiation and in the range of temperature 30 - 250°C was not purely athermal.
We calculated a diffusion coefficient under irradiation D250 °C of about 0-14 cm^2.s^(-1).
We showed the importance of the implantation and irradiation defects as preferential paths for a fast chlorine transport. We carried out ab initio calculations showing that chlorine is preferentially located in a substitutional site. This is in favour of a Frank-Turnbull diffusion mechanism or a vacancy/chlorine.
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Yves Pipon. Diffusion thermique et sous irradiation du chlore dans le dioxyde d'uranium. Physique [physics]. Université Claude Bernard - Lyon I, 2006. Français. ⟨tel-00139707⟩

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