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Four waste glasses were produced as cylinders with different cooling rates and different additions of simulated high level waste. On drop-testing the dominant factor was found to be the drop velocity (i.e. impact energy); glass composition and cooling time had no measurable effect. Vickers indentation and short rod fractometry tests showed that the fracture toughness was higher for glass containing fission products, particularly those including noble metals. This was due to crack branching or arrest at the metal precipitates. Radiation damaged glasses and all glasses stored in a dry Nitrogen atmosphere showed a much larger increase in toughness. It was concluded that humidity and radiation damage are more significant than differences in composition and cooling rate.

Additional information

Authors: MATZKE H J, JRC Karlsruhe Estab. (DE)
Bibliographic Reference: Paper presented: Twelfth International Symposium on the Scientific Basis for Nuclear Waste Management, Berlin (DE), Oct.10-13,1988
Availability: Available from (1) as Paper EN 34404 ORA
Record Number: 198910021 / Last updated on: 1994-12-01
Original language: en
Available languages: en