Leaching behaviour of and Cs disposition in a UMo powellite glass–ceramic

Vance, E. R. and Davis, J. and Olufson, K. and Gregg, D. J. and Blackford, M. G. and Griffiths, G. R. and Farnan, I. and Sullivan, J. and Sprouster, D. and Campbell, C. and Hughes, J. (2014) Leaching behaviour of and Cs disposition in a UMo powellite glass–ceramic. Journal of Nuclear Materials, 448 (1-3). pp. 325-329. ISSN 0022-3115 DOI https://doi.org/10.1016/j.jnucmat.2014.02.024

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Abstract

A UMo powellite glass–ceramic designed by French workers to immobilise Mo-rich intermediate-level waste was found to be quite leach resistant in water at 90 °C with the dissolution of Cs, Mo, Na, B and Ca not exceeding 2 g/L in normalised PCT tests. 133Cs solid state nuclear magnetic resonance and scanning electron microscopy (SEM) showed the Cs to inhabit the glass phase. The microstructures were not greatly affected by cooling rates between 1 and 5 °C/min or by introducing 10 times as much Cs and Sr. Protracted leach tests at 90 °C showed surface alteration as evidenced by SEM and particularly transmission electron microscopy; the main alteration phase was a Zn aluminosilicate but several other alteration phases were evident. Voidage in the alteration layers was indicated from enhanced lifetimes in positron annihilation lifetime spectroscopy.

Item Type:	Article
Uncontrolled Keywords:	2014AREP; IA67;
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Journal or Publication Title:	Journal of Nuclear Materials
Volume:	448
Page Range:	pp. 325-329
Identification Number:	https://doi.org/10.1016/j.jnucmat.2014.02.024
Depositing User:	Sarah Humbert
Date Deposited:	05 May 2014 15:45
Last Modified:	22 May 2014 15:54
URI:	http://eprints.esc.cam.ac.uk/id/eprint/3041

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