Leaching of actinides and technetium from simulated high-level waste glass
Leach tests were conducted using a modified version of the IAEA procedure to study the behavior of glass waste-solution interactions. Release rates were determined for Tc, U, Np, Pu, Am, Cm, and Si in the following solutions: WIPP B salt brine, NaCl (287 g/l), NaCl (1.76 g/1), CaCl/sub 2/ (1.66 g/l), NaHCO/sub 3/ (2.52 g/l), and deionized water. The leach rates for all elements decreased an order of magnitude from their initial values during the first 20 to 30 days leaching time. The sodium bicarbonate solution produced the highest elemental release rates, while the saturated salt brine and deionized water in general gave the lowest release. Technetium has the highest initial release of all elements studied. The technetium release rates, however, decreased by over four orders of magnitude in 150 days of leaching time. In the prepared glass, technetium was phase separated, concentrating on internal pore surfaces. Neptunium, in all cases except CaCl/sub 2/ solution, shows the highest actinide release rate. In general, curium and uranium have the lowest release rates. The range of actinide release rates is from 10/sup -5/ to 10/sup -8/ g/cm/sup 2//day. 25 figures, 7 tables.
- Research Organization:
- Battelle Pacific Northwest Labs., Richland, WA (United States)
- DOE Contract Number:
- EY-76-C-06-1830
- OSTI ID:
- 5536802
- Report Number(s):
- PNL-3152; TRN: 80-004391
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AMERICIUM
LEACHING
CURIUM
NEPTUNIUM
PLUTONIUM
RADIOACTIVE WASTES
SILICON
TECHNETIUM
URANIUM
ACID CARBONATES
ACTINIDES
AQUEOUS SOLUTIONS
BRINES
CALCIUM CHLORIDES
GLASS
SODIUM CHLORIDES
SODIUM COMPOUNDS
WATER
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM HALIDES
CHLORIDES
CHLORINE COMPOUNDS
DISPERSIONS
DISSOLUTION
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
METALS
MIXTURES
OXYGEN COMPOUNDS
RADIOACTIVE MATERIALS
REFRACTORY METALS
SEMIMETALS
SEPARATION PROCESSES
SOLUTIONS
TRANSITION ELEMENTS
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM ELEMENTS
WASTES
052000* - Nuclear Fuels- Waste Management