Source term characterization for the Maxey Flats low-level radioactive waste disposal site
The results of source term characterization studies for the Maxey Flats low-level radioactive waste disposal site show that because of the long residence time of water accumulations in the trenches, prolonged leaching and microbial degradation of waste materials occur continuously, leading to leachate formation. As a result of such interactions for extended time periods, the resultant trench leachates exhibit significant modifications in terms of inorganic, organic, and radionuclide constituents and acquire geochemical properties that are unique, compared to ambient groundwater. The leachates generally exhibit varying degrees of anoxia characterized by negative redox potentials, low dissolved oxygen and sulfate concentrations, high alkalinity, and high ammonia concentrations. The enrichments, to varying degrees, of inorganic, organic, and radionuclide constituents associated with fuel cycle and non-fuel cycle low-level wastes reflect the nature of the leaching process itself and of the waste materials. Elevated concentrations of Na/sup +/, K/sup +/, Fe/sub TOTAL/, Mn/sub TOTAL/, Cl/sup -/, dissolved organic and inorganic carbon, and several organic compounds as well as radionuclides, such as /sup 3/H, /sup 241/Am, /sup 60/Co, /sup 134/Cs, /sup 137/Cs, /sup 90/Sr, /sup 238/Pu, and /sup 239//sup,/sup 240/Pu are a consequence of waste leaching. Some of the waste-derived organic compounds present in the trenches, such as chelating agents and several carboxylic acids, are strong complexing agents and have the potential to form stable radionuclide complexes and thus enhance nuclide mobility. The consequences of past disposal practices as reflected in the problems associated with the burial of unsegregated, poorly packaged, and unstabilized wastes at the Maxey Flats disposal site indicate the significance of waste segregation, improved stabilization, and proper packaging.
- Research Organization:
- Brookhaven National Lab., Dept. of Nuclear Energy, Upton, NY 11973
- OSTI ID:
- 6082742
- Journal Information:
- Nucl. Technol.; (United States), Vol. 72:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
GROUND WATER
RADIONUCLIDE MIGRATION
LOW-LEVEL RADIOACTIVE WASTES
UNDERGROUND DISPOSAL
RADIOACTIVE WASTE DISPOSAL
SOURCE TERMS
RADIOISOTOPES
RADIOECOLOGICAL CONCENTRATION
ANOXIA
BIODEGRADATION
LEACHATES
LEACHING
PACKAGING
RADIOACTIVE WASTE FACILITIES
STABILIZATION
TIME DEPENDENCE
CHEMICAL REACTIONS
DECOMPOSITION
DISPERSIONS
DISSOLUTION
ECOLOGICAL CONCENTRATION
ENVIRONMENTAL TRANSPORT
HYDROGEN COMPOUNDS
ISOTOPES
MANAGEMENT
MASS TRANSFER
MATERIALS
MIXTURES
NUCLEAR FACILITIES
OXYGEN COMPOUNDS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
SEPARATION PROCESSES
SOLUTIONS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
WATER
052002* - Nuclear Fuels- Waste Disposal & Storage
520301 - Environment
Aquatic- Radioactive Materials Monitoring & Transport- Water- (1987)