2008
ACLN
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Y.Pipon, N.Toulhoat, N.Moncoffre, N.Bererd, H.Jaffrezic, M.F.Barthe, P.Desgardin, L.Raimbault, A.M.Scheidegger, G.Carlot, 'Chlorine diffusion in uranium dioxide: thermal effects versus radiation enhanced effects', Mat. Res. Soc. Symp. Proc. xxx 77-82 (2008)
During reactor operation, chlorine (/sup 35/Cl), an impurity of the nuclear fuel, is activated into /sup 36/Cl, a long lived mobile isotope. Because of its long half life and its mobility, this isotope may contribute significantly to the instant release fraction under disposal conditions. Thermal annealing of Cl implanted UO/sub 2/ sintered pellets show that it is mobile from temperatures as low as 1273 K (E/sub a/ = 4.3 eV). Chlorine diffusion induced by irradiation with fission products preserves a thermally activated contribution. The radiation induced defects significantly enhance chlorine migration.
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