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Increased Molybdenum Loading for Vitrified High Level Waste

Published online by Cambridge University Press:  01 July 2014

Nick R. Gribble ,
Rick J Short ,
Barbara F. Dunnett  and
Carl J. Steele
Nick R. Gribble
Affiliation:
National Nuclear Laboratory, Sellafield, Seascale, Cumbria, UK, CA20 1PG
Rick J Short
Affiliation:
National Nuclear Laboratory, Sellafield, Seascale, Cumbria, UK, CA20 1PG
Barbara F. Dunnett
Affiliation:
National Nuclear Laboratory, Sellafield, Seascale, Cumbria, UK, CA20 1PG
Carl J. Steele
Affiliation:
Sellafield Ltd, Sellafield, Seascale, Cumbria, UK, CA20 1PG
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Abstract

The solubility of molybdenum in borosilicate glasses is low. The UK National Nuclear Laboratory has developed a new glass formulation containing calcium and zinc for the vitrification of high molybdenum containing waste arising from the Post Operational Clean Out of the Highly Active Storage Tanks at Sellafield that will decrease the number of product containers required, reducing both production and disposal costs. The new formulation increases the quantity of molybdenum that can be vitrified through the formation of a durable CaMoO4 phase once the solubility limit of molybdenum in the glass has been exceeded. Extensive laboratory trials confirmed the potential to increase the Mo loading significantly. Recently full scale testing has been performed on the Vitrification Test Rig using highly active liquor simulants to determine the maximum MoO3 loading that can be achieved. This paper explores the full scale testing and product quality of the glass manufactured during this study.

Keywords

Mowaste managementx-ray diffraction (XRD)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1665: Symposium NW – Scientific Basis for Nuclear Waste Management XXXVII , 2014 , pp. 253 - 259
Copyright
Copyright © Materials Research Society 2014 

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