Permeability, swelling, and radionuclide-retardation properties of candidate backfill materials
A backfill placed between a nuclear waste canister and the host geology of a nuclear waste repository can impede the migration of water through the waste package and retard the movement of radionuclides into the geologic formation. Hydraulic conductivities and swelling pressures are being determined as functions of the density of the compacted backfill, temperature, radiation dose, hydraulic head and the chemical composition of the permeating fluid. Bentonite clays and bentonite/sand mixtures have received initial emphasis. Sodium bentonite and calcium bentonite samples compacted to a dry density of 2.1 q/cm/sup 3/ had hydraulic conductivities in the range of 10/sup -12/ to 10/sup -13/ cm/s. In addition, batch distribution ratios (R/sub d/) for Sr, Cs, Am, Np, I, U and Tc have been measured for a number of candidate backfill materials. Both initial permeability and sorption studies have used a synthetic basaltic ground water.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (USA)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5718936
- Report Number(s):
- PNL-SA-9645; CONF-811122-44; ON: DE82005921; TRN: 82-007009
- Resource Relation:
- Conference: Annual meeting of the Materials Research Society, Boston, MA, USA, 16 Nov 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
RADIOACTIVE WASTE STORAGE
BACKFILLING
BENTONITE
CLAYS
HYDRAULICS
MIXTURES
PERMEABILITY
RADIONUCLIDE MIGRATION
SAND
UNDERGROUND STORAGE
DISPERSIONS
ENVIRONMENTAL TRANSPORT
FLUID MECHANICS
MANAGEMENT
MASS TRANSFER
MECHANICS
STORAGE
WASTE MANAGEMENT
WASTE STORAGE
052002* - Nuclear Fuels- Waste Disposal & Storage