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Immobilization of HLW in Synroc-E

Published online by Cambridge University Press:  25 February 2011

S.E. Kesson  and
A.E. Ringwood
S.E. Kesson
Affiliation:
Research School of Earth Sciences, Australian National University, G.P.O. Box 4, Canberra, 2601, Australia.
A.E. Ringwood
Affiliation:
Research School of Earth Sciences, Australian National University, G.P.O. Box 4, Canberra, 2601, Australia.
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Abstract

SYNROC-E is a new TiO2- rich formulation designed to immobilize ≤7% HLW. It comprises hollandite, zirconolite, perovskite, pyrochlore and alloy (totalling ˜20%) in a continuous matrix of fully densified rutile, and utilizes the principle of “synthetic rutile microencapsulation” in its microstructure. Short-term (%100 day) tests at 95°C reveal that the leach-rates for Cs,Ca,Sr and Ba lie within about an order of magnitude of one another and fall by %2 orders of magnitude over this time period. Leach-rates for U,Ce,Nd,Ti and Zr are initially extremely low and rapidly fall below ICP detection capabilities. On longer timescales, when SYNROC phases exposed at the surface of the wasteform have been leached away, the very low solubility of the protective rutile matrix should greatly inhibit further leaching. SYNROC-E is particularly suitable for burial in salt or in deep ocean sediments as a consequence of its thermal output, microstructure and its capacity to achieve public acceptability.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 26: Symposium D – Scientific Basis for Nuclear Waste Management VII , 1983 , 507
Copyright
Copyright © Materials Research Society 1984

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References

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