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Coffinitization - A Mechanism for the Alteration of UO2 under Reducing Conditions

Published online by Cambridge University Press:  25 February 2011

J. Janeczek  and
R.C. Ewing
J. Janeczek
Affiliation:
on leave from the Silesian University, WNoZ, Mielczarskiego 60, 41-200 Sosnowiec, Poland
R.C. Ewing
Affiliation:
Department of Geology, University of New Mexico, Albuquerque, NM 87131-1116, USA
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Abstract

A structural and chemical analogue of UO2 in spent fuel, uraninite, UO2+x, is unstable in the presence of dissolved silica (>10-3.6 mg/L) under reducing conditions and transforms into coffinite, USiO4 nH20. Coffinite may incorporate numerous elements into its structure including actinides and fission products. Conditions favorable for coffinitization of UO2 in spent fuel may occur in repositories in granitic, basaltic, and tuffaceous rocks.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 257: Symposium – Scientific Basis for Nuclear Waste Management XV , 1991 , 497
Copyright
Copyright © Materials Research Society 1992

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