The Leaching Behaviour of the Swedish KBS-Glasses ABS 39 and ABS 41
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THE LEACHING BEHAVIOUR OF THE SWEDISH KBS-GLASSES ABS 39 AND ABS 41 HANS-PETER HERMANSSON , HILBERT CHRISTENSEN , LARS WERME KAIJA OLLILA * AND RUNE LUNDQWIST* *Studsvik Energiteknik AB, S-611 82 NYKLPING, SWEDEN **SKBF/KBS, Box 5864, S-10248 STOCKHOLM, SWEDEN ABSTRACT The planned Swedish KBS*)glass corrosion investigation program comprises experiments with inactive glasses containing simulated waste, prolonged in-situ tests, the characterization of corrosion products, immiscibility studies, and corrosion experiments with "hot" glass. This presentation gives a short description of the entire program. It focuses thereafter on some recent leaching results with the inactive KBS glass qualities ABS 39 and ABS 41, which were leached in a manner similar to the PNL MCC-1 test procedure. INTRODUCTION In Sweden no other host medium for a repository is anticipated than crystalline (granitic) rock. The major KBS glass work within the next 3-4 years will therefore be concentrated on the compatibility and lifetime of the glass/ canister in the repository environment. The objective of studies is to generate sufficient information on glass corrosion to make the best possible prognosis for the lifetime and release rates of the glass, throughout the service life of the repository. This requires making investigations into the influence of different ionic species which exist in the ground water, as well as species which originate from the groundwater interaction with bentonite, quartz sands, getter materials and granite. In addition to this, phase separations in borosilicate glasses may need some further studies. The following sorts of experiments will be included in the KBS program: 1. Static leaching of simulated waste glasses in distilled water, and in water with different contents of groundwater elements. Corrosion products, bentonite and granite will also be introduced into the leaching cells. These experiments are aimed at determining the mechanism for corrosion and leaching of HLW-glass at different stages of corrosion. 2.
Prolonged experiments performed in a realistic environment. These experiments are aimed at testing and evaluating the validity of laboratory experiments with inactive and active glasses.
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Characterization of chemical species, in particular those of the actinides, formed by corrosion of HLW-glasses. These experiments are intended to supply part of the basis for transport models.
*)KBS: The Swedish Nuclear Fuel Safety Project
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Investigation of phase separations, molybdate and other, in HLW glasses.
5.
Static and low flow rate leaching of "hot" waste glasses. These experiments, which are similar to those described in paragraph 1, are aimed at testing and evaluating the validity of the experiments performed with simulated wastes.
This presentation describes some resent results from the first part of the program: static leaching of simulated waste glass, performed at Studsvik under a KBS contract. MATERIALS AND METHODS Two glass types, ABS 39 and ABS 41, developed at the Swedish Glass
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