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The Interaction of Borosilicate Glass and Grawodiorite at 100°C, 50 Mpa: Implications For Models Of Radionuclide Release

Published online by Cambridge University Press:  15 February 2011

David Savage  and
Jane E. RObbins
David Savage
Affiliation:
Environmental Protection Unit, Institute of Geological Sciences, Building 151, Harwell Laboratory, Oxfordshire, OX11 ORA, United Kingdom
Jane E. RObbins
Affiliation:
Environmental Protection Unit, Institute of Geological Sciences, Building 151, Harwell Laboratory, Oxfordshire, OX11 ORA, United Kingdom
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Extract

An essential component of any assessment of HLRW geological disposal options is the quantitative prediction of radionuclide release rates from the near-field over time spans of the order of 103-106 years. Fundamental to this assessment is the investigation of the interaction of potential wasteforms with groundwater under repository conditions of temperature, pressure, and groundwater flow-rate. Consequently, many studies world-wide have been initiated to examine the kinetics of wasteform dissolution over a wide range of physical and chemical conditions. Although these studies have provided a considerable amount of invaluable data on wasteform-fluid interactions, they have tended to focus on breakdown of the wasteform itself, and not on the fate of released waste components in the nearfield. For example, effects of saturation of species in solution, precipitation of secondary minerals or amorphous gels, and the effect of host rock chemistry on the products (solid and fluid) of waste-fluid interaction have largely been ignored or even specifically excluded in laboratory experiments. This is despite growing evidence from source term modelling studies which suggest that the above processes may well be the chief factors in governing rates of radionuclide release from the near-field, bearing in mind the limited availability of ground

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 11: Symposium – Scientific Basis for Nuclear Waste Management V , 1981 , 145
Copyright
Copyright © Materials Research Society 1982

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References

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