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Durability of simulated supercalcine ceramics at geologic storage conditions. Final report

Technical Report ·
OSTI ID:5567007
; ; ; ;
Two simulated high Na supercalcines, SPC-7a-2 and SPC-8a-5, have been studied. The apatite, spinel and corundum phases were confirmed in SPC-8a-5 as well as an amorphous phase containing Si, Al, Ca, Fe, and Na. Other phases tentatively identified include scheelite, nepheline, ZrO2 and Cs-molybdate. No pollucite was found perhaps because of excessive waste loading and/or inappropriate firing of calcine/additive mixture. Hydrothermal experiments were performed at 300, 400 and 500/sup 0/C and 1Kb pressure on supercalcine and supercalcine/basalt using deionized water and 0.1, 0.5, and 1.0M NaCl solutions. The apatite, spinel and corundum phases showed extensive development of crystal faces during hydrothermal treatment. The Cs-molybdate and amorphous phases disappeared. New phases produced include acmite, Cs-analcime, Ba aluminosilicate and perhaps powellite. Two types of diffusion experiments were performed on supercalcine and host rocks (basalt, granite and shale) employing a 300/sup 0/C/cm gradient. Results indicate that concentration gradient is the most important factor controlling waste component mobility followed by temperature gradient. Three theoretical models are presented to predict component migration (concentration vs. distance) as a function to time.
Research Organization:
Toledo Univ., OH (USA). Dept. of Geology
OSTI ID:
5567007
Report Number(s):
NUREG/CR-2418
Country of Publication:
United States
Language:
English

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Related Subjects

052002* -- Nuclear Fuels-- Waste Disposal & Storage
053000 -- Nuclear Fuels-- Environmental Aspects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
BASALT
CERAMICS
ENVIRONMENTAL TRANSPORT
GEOLOGY
IGNEOUS ROCKS
MANAGEMENT
MASS TRANSFER
MATHEMATICAL MODELS
RADIOACTIVE WASTE STORAGE
RADIONUCLIDE MIGRATION
ROCKS
SIMULATION
STABILITY
STORAGE
VOLCANIC ROCKS
WASTE MANAGEMENT
WASTE STORAGE
WASTE-ROCK INTERACTIONS