Waste Form Release Data Package for the 2001 Immobilized Low-Activity Waste Performance Assessment
This data package documents the experimentally derived input data on the representative waste glasses LAWABP1 and HLP-31 that will be used for simulations of the immobilized lowactivity waste disposal system with the Subsurface Transport Over Reactive Multiphases (STORM) code. The STORM code will be used to provide the near-field radionuclide release source term for a performance assessment to be issued in March of 2001. Documented in this data package are data related to 1) kinetic rate law parameters for glass dissolution, 2) alkali-H ion exchange rate, 3) chemical reaction network of secondary phases that form in accelerated weathering tests, and 4) thermodynamic equilibrium constants assigned to these secondary phases. The kinetic rate law and Na+-H+ ion exchange rate were determined from single-pass flow-through experiments. Pressurized unsaturated flow and vapor hydration experiments were used for accelerated weathering or aging of the glasses. The majority of the thermodynamic data were extracted from the thermodynamic database package shipped with the geochemical code EQ3/6. However, several secondary reaction products identified from laboratory tests with prototypical LAW glasses were not included in this database, nor are the thermodynamic data available in the open literature. One of these phases, herschelite, was determined to have a potentially significant impact on the release calculations and so a solubility product was estimated using a polymer structure model developed for zeolites. Although this data package is relatively complete, final selection of ILAW glass compositions has not been done by the waste treatment plant contractor. Consequently, revisions to this data package to address new ILAW glass formulations are to be regularly expected.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 971121
- Report Number(s):
- PNNL-13043 Rev.2; 820201000; TRN: US1001128
- Country of Publication:
- United States
- Language:
- English
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Low-Activity Waste Glass Studies: FY2000 Summary Report
Low-Activity Waste Glass Studies: FY2000 Summary Report
Related Subjects
AGING
CHEMICAL REACTIONS
DISSOLUTION
GLASS
HYDRATION
ION EXCHANGE
KINETICS
POLYMERS
RADIOISOTOPES
SECONDARY REACTIONS
SOLUBILITY
SOURCE TERMS
THERMODYNAMICS
TRANSPORT
WASTE DISPOSAL
WASTE FORMS
WASTE PROCESSING
WEATHERING
ZEOLITES