Leaching behavior of glass ceramic nuclear waste forms
Glass ceramic waste forms have been investigated as alternatives to borosilicate glasses for the immobilization of high-level radioactive waste at Pacific Northwest Laboratory (PNL). Three glass ceramic systems were investigated, including basalt, celsian, and fresnoite, each containing 20 wt % simulated high-level waste calcine. Static leach tests were performed on seven glass ceramic materials and one parent glass (before recrystallization). Samples were leached at 90/sup 0/C for 3 to 28 days in deionized water and silicate water. The results, expressed in normalized elemental mass loss, (g/m/sup 2/), show comparable releases from celsian and fresnoite glass ceramics. Basalt glass ceramics demonstrated the lowest normalized elemental losses with a nominal release less than 2 g/m/sup 2/ when leached in polypropylene containers. The releases from basalt glass ceramics when leached in silicate water were nearly identical with those in deionized water. The overall leachability of celsian and fresnoite glass ceramics was improved when silicate water was used as the leachant.
- Research Organization:
- Battelle Pacific Northwest Labs., Richland, WA (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5604658
- Report Number(s):
- PNL-4022; ON: DE82005595; TRN: 82-004785
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
CERAMICS
LEACHING
GLASS
RADIOACTIVE WASTE STORAGE
RADIONUCLIDE MIGRATION
RADIOACTIVE WASTES
BASALT
COMPARATIVE EVALUATIONS
SILICATES
TITANATES
WATER
DISSOLUTION
ENVIRONMENTAL TRANSPORT
HYDROGEN COMPOUNDS
IGNEOUS ROCKS
MANAGEMENT
MASS TRANSFER
MATERIALS
OXYGEN COMPOUNDS
RADIOACTIVE MATERIALS
ROCKS
SEPARATION PROCESSES
SILICON COMPOUNDS
STORAGE
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VOLCANIC ROCKS
WASTE MANAGEMENT
WASTE STORAGE
WASTES
052002* - Nuclear Fuels- Waste Disposal & Storage
053000 - Nuclear Fuels- Environmental Aspects