Leach models for a commercial nuclear-waste glass

Conference · Wed Sep 01 00:00:00 EDT 1982

OSTI ID:6670775

Kuhn, W L; Peters, R D

A review of the leaching behavior of 76-68 glass shows that it cannot be explained in terms of diffusion in the glass, which has been the basis for several leach models. Instead, we present two models based on a dissolution rate impeded by surface processes: the accumulation of a protective layer of insoluble reaction products, and adsorption of reaction products on the surface. The resulting predicted time dependences are identical and predict a change from linear to parabolic rate laws for soluble species, which is found to agree with the data over a range of temperatures. Incongruent release is attributed primarily to solubility effects. The relative merits of the models are discussed on the basis of the effect of surface area-to-volume ratio in static leach tests. Their relevance to modeling repository behaivor is discussed.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6670775
• Report Number(s): PNL-SA-10549; CONF-821107-24; ON: DE83002698
• Resource Relation: Conference: 6. international symposium on the scientific basis for radioactive waste management, Boston, MA, USA, 1 Nov 1982
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
BOROSILICATE GLASS
LEACHING
RADIOACTIVE WASTES
CHEMICAL REACTION KINETICS
HYDROLYSIS
MATHEMATICAL MODELS
RADIOACTIVE WASTE DISPOSAL
RADIONUCLIDE MIGRATION
CHEMICAL REACTIONS
DECOMPOSITION
DISSOLUTION
ENVIRONMENTAL TRANSPORT
GLASS
KINETICS
LYSIS
MANAGEMENT
MASS TRANSFER
MATERIALS
RADIOACTIVE MATERIALS
REACTION KINETICS
SEPARATION PROCESSES
SOLVOLYSIS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
052002* - Nuclear Fuels- Waste Disposal & Storage
360603 - Materials- Properties
053000 - Nuclear Fuels- Environmental Aspects