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Leaching of Actinides from Nuclear Waste Glass: French Experience

  • E.Y. Vernaz (a1) and N. Godon (a1)

Abstract

Results are presented for a large number of aqueous leach tests on glass specimens doped with 237Np, 238Pu, 239pu, 241Am or 244Cm. The effects of the leaching mode (static or dynamic), temperature and environmental materials are discussed. The amount of actinides contained in the alteration film is characterized by the retention factor RF = NL(B)/NL(act). The neptunium retention factor ranged from 1 to 10 depending on the test conditions; for plutonium and americium, the retention factor varied from 6 to 1300.

In general, the retention factor increased with the temperature. The very important influence of the environmental materials shows that there is competition for actinide retention between the alteration film and the surrounding materials, but in every case the amount of ca activity released into solution is very low.

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References

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1. Matzke, Hj., “Actinide Diffusion in Waste Glasses” in Thermodynamics of Nuclear Materials, vol 1, pp 311329, IAEA Vienna (1980).
2. Vernaz, E. and Dussossoy, J.L., “Current State of Knowledge of Nuclear Waste Glass Corrosion Mechanisms: the Case of R7T7 Glass” accepted for publication in Applied Geochemistry (Special Issue: 1991).
3. Vernaz, E., Fillet, S., Jacquet-Francillon, N., “Les actinides dans les verres” Journal of Less Common Metals, 121 (1986 London and Bonn), 637644.
4. Vernaz, E., Jacquet-Francillon, N. and Bonniaud, R., “Effets des désintégrations alpha dans les verres” Echos CEA, Special Issue (1982), 3843.
5. Fillet, S., Noguès, J.L., Vernaz, E. and Jacquet-Francillon, N., “Leaching of Actinides from the French LWR Reference GlassScientific Basis for Nuclear Waste Management IX, Mat. Res. Soc. Symp. Proc., 50, 211218 (1985).
6. Advocat, T., Crovisier, J.L., Vernaz, E., Ehret, G. and Charpentier, H., “Hydrolysis of R717 Nuclear Waste Glass in Dilute Media: Mechanisms and Rate as a Function of pHScientific Basis for Nuclear Waste Management XIV, Mat. Res. Soc. Symp. Proc., 212 (1991).
7. Godon, N., Vernaz, E., Thomassin, J.H. and Touray, J.C., “Effect of Environmental Materials on Aqueous Corrosion of R717 GlassScientific Basis for Nuclear Waste Management XII, Mat. Res. Soc. Symp. Proc., 127, 97104 (1989).
8. Vernaz, E. and Godon, N., “Key Parameters of Glass Dissolution in Integrated SystemsScientific Basis for Nuclear Waste Management XIV, Mat. Res. Soc. Symp. Proc. 212, 1930 (1991).
9. Noguès, J.L., Vernaz, E., Jacquet-Francillon, N. and Pasquini, S., “Interaction between a Nuclear Glass and Nearfield Materials in Various Rigs Simulating a Geological Disposal” Proceedings of the International Seminar on Radioactive Waste Products, Jüllich, Germany, June 10-13,1985.
10. Godon, N. and Vernaz, E., “R7T7 Nuclear Waste Glass Behavior in Moist Clay : Role of the Clay Mass/Glass Surface Area RatioScientific Basis for Nuclear Waste Management XIII, Mat. Res. Soc. Symp. Proc., 176,319326 (1990).
11. Dussossoy, J.L., Chouchan, J.L., Bouchon, M. and Vernaz, E., Leaching Sensitivity to Geologic Environmental Parameters, CCE contract No FI 1W 0027, Final Report, EUR 13603 EN.
12. Puigdomenech, I. and Bruno, J., Plutonium solubilities, SKB Technical Report No 91-04.

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