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Title: FY2017 ILAW Glass Corrosion Testing with the Single-Pass Flow-Through Method

Abstract

The inventory of immobilized low-activity waste (ILAW) produced at the Hanford Tank Waste Treatment and Immobilization Plant (WTP) will be disposed of at the near-surface, on-site Integrated Disposal Facility (IDF). When groundwater comes into contact with the waste form, the glass will corrode and radionuclides will be released into the near-field environment. Because the release of the radionuclides is dependent on the dissolution rate of the glass, it is important that the performance assessment (PA) model accounts for the dissolution rate of the glass as a function of various conditions. To accomplish this, an IDF PA glass dissolution model based on Transition State Theory (TST) can be employed. The model is able to account for changes in temperature, exposed surface area, and pH of the contacting solution as well as the effect of silicon solution concentrations, specifically the activity of orthosilicic acid (H4SiO4), whose concentration is directly linked to the glass dissolution rate. In addition, the IDF PA model accounts for the ion exchange process. The effect of temperature, pH, H4SiO4 activity, and the rate of ion exchange can be parameterized and implemented directly into the PA rate model. The rate model parameters are derived from laboratory tests with themore » single-pass flow-through (SPFT) method. The provided data can be used by glass researchers to further the understanding of ILAW glass behavior, by IDF PA modelers to use the rate model parameters in PA modeling efforts, and by Department of Energy (DOE) contractors and decision makers as they assess the IDF PA program.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1440631
Report Number(s):
PNNL-27098
830403000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English

Citation Formats

Neeway, James J., Asmussen, Robert M., Cordova, Elsa, Lonergan, Charmayne E., Williams, Benjamin D., Leavy, Ian I., and Mcelroy, Erin M. FY2017 ILAW Glass Corrosion Testing with the Single-Pass Flow-Through Method. United States: N. p., 2018. Web. doi:10.2172/1440631.
Neeway, James J., Asmussen, Robert M., Cordova, Elsa, Lonergan, Charmayne E., Williams, Benjamin D., Leavy, Ian I., & Mcelroy, Erin M. FY2017 ILAW Glass Corrosion Testing with the Single-Pass Flow-Through Method. United States. doi:10.2172/1440631.
Neeway, James J., Asmussen, Robert M., Cordova, Elsa, Lonergan, Charmayne E., Williams, Benjamin D., Leavy, Ian I., and Mcelroy, Erin M. Wed . "FY2017 ILAW Glass Corrosion Testing with the Single-Pass Flow-Through Method". United States. doi:10.2172/1440631. https://www.osti.gov/servlets/purl/1440631.
@article{osti_1440631,
title = {FY2017 ILAW Glass Corrosion Testing with the Single-Pass Flow-Through Method},
author = {Neeway, James J. and Asmussen, Robert M. and Cordova, Elsa and Lonergan, Charmayne E. and Williams, Benjamin D. and Leavy, Ian I. and Mcelroy, Erin M.},
abstractNote = {The inventory of immobilized low-activity waste (ILAW) produced at the Hanford Tank Waste Treatment and Immobilization Plant (WTP) will be disposed of at the near-surface, on-site Integrated Disposal Facility (IDF). When groundwater comes into contact with the waste form, the glass will corrode and radionuclides will be released into the near-field environment. Because the release of the radionuclides is dependent on the dissolution rate of the glass, it is important that the performance assessment (PA) model accounts for the dissolution rate of the glass as a function of various conditions. To accomplish this, an IDF PA glass dissolution model based on Transition State Theory (TST) can be employed. The model is able to account for changes in temperature, exposed surface area, and pH of the contacting solution as well as the effect of silicon solution concentrations, specifically the activity of orthosilicic acid (H4SiO4), whose concentration is directly linked to the glass dissolution rate. In addition, the IDF PA model accounts for the ion exchange process. The effect of temperature, pH, H4SiO4 activity, and the rate of ion exchange can be parameterized and implemented directly into the PA rate model. The rate model parameters are derived from laboratory tests with the single-pass flow-through (SPFT) method. The provided data can be used by glass researchers to further the understanding of ILAW glass behavior, by IDF PA modelers to use the rate model parameters in PA modeling efforts, and by Department of Energy (DOE) contractors and decision makers as they assess the IDF PA program.},
doi = {10.2172/1440631},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 07 00:00:00 EST 2018},
month = {Wed Feb 07 00:00:00 EST 2018}
}

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