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Effets de la température et de l’irradiation sur le comportement du chlore 37 dans le graphite nucléaire : conséquences sur la mobilité du chlore 36 dans les graphites irradiés

Abstract : This thesis deals with the studies of the management of irradiated graphite wastes issued from the dismantling of the UNGG French reactors. This work focuses on the behavior of 36Cl. This radionuclide is mainly issued through the neutron activation of 35Cl by the reaction 35Cl(n, γ)36Cl, pristine chlorine being an impurity of nuclear graphite, present at the level of some at.ppm. 36Cl is a long lived radionuclide (about 300,000 years) and is highly soluble in water and mobile in concrete and clay. The solubilization of 36Cl is controlled by the water accessibility into irradiated graphite pores as well as by factors related to 36Cl itself such as its chemical speciation and its location within the irradiated graphite. Both speciation and chlorine location should strongly influence its behaviour and need to be taken into account for the choice of liable management options. However, data on radioactive chlorine features are difficult to assess in irradiated graphite and are mainly related to detection sensitivity problems. In this context, we simulated and evaluated the impact of the temperature, the irradiation and the radiolytic oxidation on the chlorine 36 behaviour. In order to simulate the presence of 36Cl, we implanted 37Cl into virgin nuclear graphite. Ion implantation has been widely used to study the lattice location, the diffusion and the release of fission and activation products in nuclear materials. Our results on the comparative effects of the temperature and the irradiation show that chlorine occurs in irradiated graphite on temperature and electronic and nuclear irradiation improve this effect
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Submitted on : Monday, September 21, 2015 - 6:07:06 PM
Last modification on : Friday, September 10, 2021 - 1:50:14 PM
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Antoine Blondel. Effets de la température et de l’irradiation sur le comportement du chlore 37 dans le graphite nucléaire : conséquences sur la mobilité du chlore 36 dans les graphites irradiés. Physique Nucléaire Expérimentale [nucl-ex]. Université Claude Bernard - Lyon I, 2013. Français. ⟨NNT : 2013LYO10323⟩. ⟨tel-01202855⟩

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