Dissolution of low burn-up (33 GWd·t−1) spent nuclear fuel at alkaline and hyperalkaline pH
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The release of some key radionuclides during the dissolution of a low burnup spent nuclear fuel (33 GWd⋅t − 1 ) was measured in two leaching experiments under oxidizing conditions and in alkaline to hyperalkaline pH. The results were compared to the ones obtained in a previous experiment with the same fuel but with a higher burnup (63 GWd⋅t − 1 ). Uranium, plutonium and neptunium had a faster release at low burnup, caesium a slower release and the release of molybdenum and technetium did not almost depend on burnup. The experiment at pH = 13.5 showed a possible precipitation of uranium, plutonium and neptunium and much higher molybdenum and technetium release than at alkaline pH, pointing to a higher dissolution of the ε-particles at high pH.
Abstract
The release of some key radionuclides during the dissolution of a low burnup spent nuclear fuel (33 GWd⋅t − 1 ) was measured in two leaching experiments under oxidizing conditions and in alkaline to hyperalkaline pH. The results were compared to the ones obtained in a previous experiment with the same fuel but with a higher burnup (63 GWd⋅t − 1 ). Uranium, plutonium and neptunium had a faster release at low burnup, caesium a slower release and the release of molybdenum and technetium did not almost depend on burnup. The experiment at pH = 13.5 showed a possible precipitation of uranium, plutonium and neptunium and much higher molybdenum and technetium release than at alkaline pH, pointing to a higher dissolution of the ε-particles at high pH.