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The Leaching of Pu, Am, Np and Tc from High-Level Waste Glasses in Clay Media

Published online by Cambridge University Press:  01 January 1992

K. Lemmens ,
P. Van iseghem  and
L. Wang
K. Lemmens
Affiliation:
SCK/CEN, Boeretang 200, 2400, Mol, Belgium
P. Van iseghem
Affiliation:
SCK/CEN, Boeretang 200, 2400, Mol, Belgium
L. Wang
Affiliation:
SCK/CEN, Boeretang 200, 2400, Mol, Belgium
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Abstract

The leaching behaviour of Pu, Am, Np and Tc from the high-level waste glasses of interest to Belgium has been studied. Corrosion tests were carried out on inactive glasses (the Cogéma R7T7 glass SON68 and the DWK Pamela glasses SM513 and SM527), doped with the radionuclides. Nuclide leaching was studied in contact with a slurry of Boom clay, diluted with claywater, at 90°C and 40°C, for durations of up to 4 years. The retention of Pu and Np in the glass surface layers was considerable for SON68 and SM513, but small for SM527. The retention of these elements decreased at lower temperature. Tc was not retained. The largest part of the leached activity is adsorbed onto the clay in an immobile form. Nuclide concentration in mobile form (smaller than 105 MWU) was found to be independent on duration for Pu and Am. Increasing concentrations were found for Np and Tc. The mobile concentrations were smaller in the presence of corrosion products.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 294: Symposium V – Scientific Basis for Nuclear Waste Management XVI , 1992 , 147
Copyright
Copyright © Materials Research Society 1993

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References

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