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Molybdenum release from high burnup spent nuclear fuel at alkaline and hyperalkaline pH
García-Gómez Sonia,Giménez Javier,Casas Ignasi,Llorca Jordi,De Pablo Joan,Martínez-Torrents Albert,Clarens Frederic,Kokinda Jakub,Iglesias Luis,Serrano-Purroy Daniel 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.1
This work presents experimental data and modelling of the release of Mo from high-burnup spent nuclear fuel (63 MWd/kgU) at two different pH values, 8.4 and 13.2 in air. The release of Mo from SF to the solution is around two orders of magnitude higher at pH = 13.2 than at pH = 8.4. The high Mo release at high pH would indicate that Mo would not be congruently released with uranium and would have an important contribution to the Instant Release Fraction, with a value of 5.3%. Parallel experiments with pure non irradiated Mo(s) and XPS determinations indicated that the faster dissolution at pH = 13.2 could be the consequence of the higher releases from metallic Mo in the fuel through a surface complexation mechanism promoted by the OH and the oxidation of the metal to Mo(VI) via the formation of intermediate Mo(IV) and Mo(V) species.