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Strontium Leachability of Hydrofracture Grouts for Sludge-Slurries

Published online by Cambridge University Press:  21 February 2011

M. T. Morgan ,
E. W. Mcdaniel ,
J. G. Moore ,
H. E. Devaney  and
L. R. Dole
M. T. Morgan
Affiliation:
Oak Ridge National Laboratory, P. O. Box X, Oak Ridge, Tennessee, USA
E. W. Mcdaniel
Affiliation:
Oak Ridge National Laboratory, P. O. Box X, Oak Ridge, Tennessee, USA
J. G. Moore
Affiliation:
Oak Ridge National Laboratory, P. O. Box X, Oak Ridge, Tennessee, USA
H. E. Devaney
Affiliation:
Oak Ridge National Laboratory, P. O. Box X, Oak Ridge, Tennessee, USA
L. R. Dole
Affiliation:
Oak Ridge National Laboratory, P. O. Box X, Oak Ridge, Tennessee, USA
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Abstract

This paper summarizes a series of experiments to determine the strontium leachability of cement-based sludge-slurry hydrofracture grouts.

The hydrofracture process has been used at ORNL since 1966 for the routine disposal of intermediate-level waste (ILW) solutions. In this process, cement and other additives are mixed with a waste stream to form grout, which is then injected into a shale bed at a pressure sufficient to cause fracturing along the horizontal bedding planes. This injected grout soon hardens, fixing the radionuclides between layers of the massive Conasauga shale formation.

Modified IAEA dynamic leach tests on hydrofracture grout specimens showed improved leach resistance (by a factor of 3 to 5) as the curing time increased from 28 d to 91 d. A weak trend toward lower leachability with increased amounts of dry solids was observed.

The moving boundary-plus-diffusion leach model fits the dynamic leach data successfully in most cases. An apparent diffusion coefficient of 5 × 10−12 cm2/s and a moving boundary coefficent of 1 × 10−7 s−1 were obtained when one of the best grout compositions was leached in distilled water.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 15: Symposium D – Scientific Basis for Nuclear Waste Management VI , 1982 , 235
Copyright
Copyright © Materials Research Society 1983

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References

REFERENCES

1. Weeren, H. O. and Mackey, T. S., Waste Sludge Resuspension and Transfer - Development Program, ORNL/TM–7125 (September 1980).Google Scholar
2. DeLaguna, W., Tamura, T., Weeren, H. O., Struxness, E. C., McClain, W. C., and Sexton, R. C., Engineering Development of Hydraulic Fracturing as a Method for Permanent Disposal of Radioactive Wastes, ORNL–4259 (August 1968).Google Scholar
3. Weeren, H. O., Shale Fracturing Injections at Oak Ridge National Laboratory - 1972 Series, ORNL/TM–4467 (June 1974).Google Scholar
4. Weeren, H. O., Shale Fracturing Injections at Oak Ridge National Laboratory - 1975 Series, ORNL/TM–5545 (August 1976).Google Scholar
5. Weeren, H. O., Shale Fracturing Injections at Oak Ridge National Laboratory - 1977–1979 Series, ORNL/TM–7421 (September 1980).Google Scholar
6. McDaniel, E. W., Rheology of Sludge-Slurry Grouts, ORNL/TM–7497 (October 1980).Google Scholar
7. Moore, J. G., Godbee, H. W., Kibbey, A. H., and Joy, D. S., Development of Cementitious Grouts for the Incorporation of Radioactive Wastes, Part 1: Leach Studies, ORNL–4962 (April 1975).Google Scholar
8. Moore, J. G., Development of Cementitious Grouts for the Incorporation of Radioactive Wastes, Part 2: Continuation of Cesium and Strontium Leach Studies, ORNL–5142 (September 1976).CrossRefGoogle Scholar
9. International Atomic Energy Agency, “Leach Testing of Immobilized Radioactive Waste Solids, A Proposal for a Standard Method,” ed. by E. D. Hespe, At. Energy Rev. 9(1), 195–207 (1971).Google Scholar
10. Godbee, H. W., Compere, E. L., Joy, D. S., Kibbey, A. H., Moore, J. G., and Nestor, C. W. Jr., “Applications of Mass Transport Theory to the Leaching of Radionuclides from Waste Solids,” Nucl. Chem. Waste Management 1, 29–35 (1980).Google Scholar
11. McDaniel, E. W., Morgan, M. T., Moore, J. G., Devaney, H. E., and Dole, L. R., Strontium Leachability of Hydrofracture Grouts for Sludge-Slurries, ORNL/TM–8198 (March 1982).CrossRefGoogle Scholar