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Molybdenum release from high burnup spent nuclear fuel at alkaline and hyperalkaline pH

Kokinda Jakub|Serrano-Purroy Daniel|Martínez-Torrents Albert|Clarens Frederic|Giménez Javier|García-Gómez Sonia|Casas Ignasi|Llorca Jordi|De Pablo Joan|Iglesias Luis
한국원자력학회 (Korean Nuclear Society)|2024.01|Nuclear Engineering and Technology|제56권 제1호|pp. 34-41|DOI 10.1016/j.net.2023.08.024

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참고문헌

키워드

X-ray photoelectron spectroscopyMolybdenumSpent nuclear fuelMetallic inclusionsHyperalkaline conditionsInstant release fraction
주제분류원자력공학

초록

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.

Abstract

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.

참고문헌 (34)

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