Ruthenium volatilisation from reprocessed spent nuclear fuel - Studying the baseline thermodynamics of Ru(III)

Johal, Sukhraaj K. and Boxall, Colin and Gregson, Colin and Steele, Carl J. (2015) Ruthenium volatilisation from reprocessed spent nuclear fuel - Studying the baseline thermodynamics of Ru(III). ECS Transactions, 66. pp. 31-42. ISSN 1938-6737

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Abstract

Ruthenium is a fission product possessed of two relatively long lived isotopes, Ru and Ru, both of which form part of the Highly Active (HA) waste raffinate during spent nuclear fuel reprocessing. During reprocessing ruthenium, which may be in the form of the RuNO+ complex, encounters temperatures conducive to volatilization. Due rutheium's high specific radioactivity it is important to understand the mechanism by which volatilisation occurs. Here we use combined CV, RDE and electrochemical microgravimetry experiments in a study of the the RuCl3 system for the first time. We do this in the interest of establishing NO-free Ru(III) baseline behaviour so as to support future studies on NO complexed ruthenium. Using wide aqueous solvent window carbon electrodes we have observed discrete oxidations to a solution phase Ru(III)-Ru(IV)-Ru(III) trimer, to solid RuO2 and volatile RuO4. We have also observed and assigned discrete reductions of solid RuO2 back to Ru(III) and Ru(III) reduction to ruthenium metal.

Item Type:
Journal Article
Journal or Publication Title:
ECS Transactions
Additional Information:
© 2015 ECS - The Electrochemical Society
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200
Subjects:
ID Code:
78523
Deposited By:
Deposited On:
07 Mar 2016 09:40
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Oct 2020 01:27