Mixed alkali effect on HLW glass properties and the corrosion behavior of the WAK HLW glass product in brines
- Forschungszentrum Karlsruhe (Germany). Inst. fuer Nukleare Entsorgungstechnik
A vitrification process was developed at KfK/INE for solidifying in borosilicate glasses HLW solutions from the nuclear fuel cycle. To optimize melter operation and in view of final storage of the HLW glass, experimental work was done to find out how the viscosity, the slope of the viscosity curve, the specific electrical resistance and the chemical durability depend on the chemical composition of the glass. Especially the effect of mixed alkalis on the glass properties was studied. It was found that by increasing from 0 to 1 the Li{sub 2}O/(Na{sub 2}O+Li{sub 2}O) molar ratio of the glass FRIT WAW, viscosity of the melt decreases about linearly and the slope of the viscosity curve decreases as well. The electrical resistance passes through a maximum and the Soxhlet leach rate through a minimum at an alkali ratio of about 0.45. Further, results are presented about the corrosion behavior of the WAK-HLW glass GP WAK1. The experiments were performed in two reference brines at a temperature of 190 C and at high S/V ratios of 1,000 and 10,000 m{sup {minus}1}. In the MgCl{sub 2}-rich solution the release patterns of the mobile elements (e.g., Li and B) show a square root of time dependence indicating diffusion controlled glass matrix dissolution. In the NaCl-rich solution, the release of the elements increases with a time exponent much lower than 0.5 or even diminishes with time, and the concentrations of REE and U in the leachates are below the detection limits.
- OSTI ID:
- 178131
- Report Number(s):
- CONF-950917-; ISBN 0-7918-1219-7; TRN: 96:006644
- Resource Relation:
- Conference: 5. international conference on radioactive waste management and environmental remediation, Berlin (Germany), 3-9 Sep 1995; Other Information: PBD: 1995; Related Information: Is Part Of Fifth international conference on radioactive waste management and environmental remediation -- ICEM `95: Proceedings. Volume 1: Cross-cutting issues and management of high-level waste and spent fuel; Slate, S.; Feizollahi, F.; Creer, J. [eds.]; PB: 900 p.
- Country of Publication:
- United States
- Language:
- English
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