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Laboratory and Modelling Studies of Sodium Benionite Grounmater Interaction

Published online by Cambridge University Press:  28 February 2011

M. Sneujman ,
H. Uotiia  and
J. Rantanen
M. Sneujman
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory, SF-02150 Espoo, Finland
H. Uotiia
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory, SF-02150 Espoo, Finland
J. Rantanen
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory, SF-02150 Espoo, Finland
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Abstract

According to the present Finnish concept sodium bentonite will be used as a buffer material in the repository for high-level waste. Experimental and theoretical studies treating the effect of bentonite upon the chemical conditions in a repository have been initiated with the object of specifying the chemistry of the near field.

Sodium bentonite was let react with water under anaerobic conditions at 25°C for 540 days, during which time six fluid samples were extracted for the chemical analysis of 15 chemical species. The generated fluid phase was alkaline (PH = 9…10) and contained a high amount of bicarbonate. Also a low redox-potential was measured. The fluid phase chemistry was investigated using the geochemical code PHREEM. Calcite saturation was observed in all fluid samples.

A modelling of sodium bentonite interaction with water based on the main mineral components of bentonite was also performed with PHREEQE. A fairly good agreement between experimental results and model calculations was observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 84: Symposium L – Scientific Basis for Nuclear Waste Management X , 1986 , 781
Copyright
Copyright © Materials Research Society 1987

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References

1. Wickström, P., Lampén, P., Lavia test borehole - Sutmnary of groundwater investigations 1984-1985, YJT-86-11, 1986 (In Finnish).Google Scholar
2. Hyyppä, J., Chemical couposition of ground water in the bedrock of Finland, YJT-84-10, 1984 (in Finnish).Google Scholar
3. Allard, B. et al. , “Minerals and Precipitates in Fractures and their Effects on the Reaction of Radionuclides in Crystalline Rocks”. Proc. Near Field Phenomena in Geologic Repositories for Radioactive Waste, p. 93, Seattle, 1981.Google Scholar
4. Snellman, M., Factors affecting actinide solubility in a repository for spent fuel, I, YJT-86-13, 1986.Google Scholar
5. Johnston, R.M., Miller, H.G., Effect of pH on smectite stability, KBS TR 85-11, Smectie Alteration Proceedings, 1984, pp. 54-56 and 146–161.Google Scholar
6. Johnston, R.M., Miller, H.G., The effect of pH on the stability of smectite, AECL-8366, 1984.Google Scholar
7. Grauer, R., Bentonit als Verfüllungsmaterial in Endlager für hochaktiven Abfall: Chemische Aspekte, NAGRA Technischer Bericht 86-12, 1985.Google Scholar
8. Holopainen, P., Pirhonen, V., Snellman, M., Crushed aggregate-bentonite mixtures as backfill material for the Finnish repositories of low- and intermediate-level radioactive wastes, YJT-84-07, 1984.Google Scholar
9. Parkhurst, D.C., Thorstenson, D.C., Plummer, L.N., PHREEQE - A Computer program for geochemical calculations, U.S. Geological Survey, PB-81-167801, January 1985.Google Scholar
10. Thorstenson, D.C., Fisher, D.W., The Geochemistry of the Foxhills-Basal Hell Creek Aquifer in Southwestern North Dakota and Northwestern South Dakota, Water Resources Research 15(6)1979.CrossRefGoogle Scholar
11. Miller-Vonmoos, M., Kahr, G., Mineralogische Untersuchungen von Vyaming Bentonite MX-80 und Montigel, ETH Technischer Bericht 83–12, 1983.Google Scholar
12. Grambow, B. et al. , Glass water reaction with and without bentonite present - experiment and nodel, Proc. Scientific Basis for Radioactive Waste Management IX, Stockholm, Sweden 1985. Ed. Werme, L. p. 187.Google Scholar