Mechanisms of Defense Waste Glass Dissolution

1986 ◽  
Vol 73 (2) ◽  
pp. 140-164 ◽  
Author(s):  
Aaron Barkatt ◽  
Barbara C. Gibson ◽  
Pedro B. Macedo ◽  
Charles J. Montrose ◽  
William Sousanpour ◽  
...  
Keyword(s):  
Waste Glass ◽  
Glass Dissolution

scholarly journals The initial dissolution rates of simulated UK Magnox–ThORP blend nuclear waste glass as a function of pH, temperature and waste loading

2015 ◽  
Vol 79 (6) ◽  
pp. 1529-1542 ◽  
Author(s):  
N. Cassingham ◽  
C.L. Corkhill ◽  
D.J. Backhouse ◽  
R.J. Hand ◽  
J.V. Ryan ◽  
...  
Keyword(s):  
Dissolution Kinetics ◽  
Intrinsic Rate ◽  
Waste Glass ◽  
High Level Waste ◽  
Dissolution Mechanism ◽  
Dissolution Rates ◽  
Forward Rates ◽  
Glass Dissolution ◽  
High Level ◽  
Kinetics Of

AbstractThe first comprehensive assessment of the dissolution kinetics of simulant Magnox–ThORP blended UK high-level waste glass, obtained by performing a range of single-pass flow-through experiments, is reported here. Inherent forward rates of glass dissolution were determined over a temperature range of 23 to 70°C and an alkaline pH range of 8.0 to 12.0. Linear regression techniques were applied to the TST kinetic rate law to obtain fundamental parameters necessary to model the dissolution kinetics of UK high-level waste glass (the activation energy (Ea), pH power law coefficient (η) and the intrinsic rate constant (k0)), which is of importance to the post-closure safety case for the geological disposal of vitreous products. The activation energies based on B release ranged from 55 ± 3 to 83 ± 9 kJ mol–1, indicating that Magnox–THORP blend glass dissolution has a surface-controlled mechanism, similar to that of other high-level waste simulant glass compositions such as the French SON68 and LAW in the US. Forward dissolution rates, based on Si, B and Na release, suggested that the dissolution mechanism under dilute conditions, and pH and temperature ranges of this study, was not sensitive to composition as defined by HLW-incorporation rate.

Remaining Uncertainties in Predicting Long-Term Performance of Nuclear Waste Glass From Experiments

1993 ◽  
Vol 333 ◽  
Author(s):  
B. Grambow ◽  
Kernforschungszentrum Karlsruhe
Keyword(s):  
Current Knowledge ◽  
Research Work ◽  
Waste Glass ◽  
Dissolution Mechanism ◽  
Glass Dissolution ◽  
Radionuclide Release ◽  
Long Term Performance ◽  
Term Performance ◽  
Term Maintenance

ABSTRACTThe current knowledge on the glass dissolution mechanism and the representation of glass dissolution concepts within overall repository performance assessment models are briefly summarized and uncertainties related to mechanism, radionuclide chemistry and parameters are discussed. Understanding of the major glass dissolution processes has been significantly increased in recent years. Long-term glass stability is related to the long-term maintenance of silica saturated conditions. The behavior of individual radionuclides in the presence of a dissolving glass has not been sufficiently and results do not yet allow meaningful predictions. Conservative long-term predictions of glass matrix dissolution as upper limit for radionuclide release can be made with sufficient confidence, however these estimations generally result in a situation were the barrier function of the glass is masked by the efficiency of the geologic barrier. Realistic long-term predictions may show that the borosilicate waste glass contributes to overall repository safety to a much larger extent than indicated by overconservatism. Today realistic predictions remain highly uncertain and much more research work is necessary. In particular the long-term rate under silica saturated conditions needs to be understood and the behavior of individual radionuclides in the presence of a dissolving glass deserves more systematic investigations.

Effects of Rocks and Backfill Materials on Waste Glass Leaching

1985 ◽  
Vol 50 ◽  
Author(s):  
K. Ishiguro ◽  
N. Sasaki ◽  
H. Kashihara ◽  
M. Yamamoto
Keyword(s):  
Waste Glass ◽  
Distilled Water ◽  
Leach Rate ◽  
Glass Dissolution ◽  
Crushed Granite ◽  
Backfill Materials ◽  
Long Term Experiment ◽  
Static Conditions ◽  
Glass Leaching

AbstractExtensive studies have been made on the interactions between a waste glass and repository materials under static conditions. One of the PNC reference glasses was leached in the solution prepared from water in contact with crushed granite, tuff, diabase and backfill materials such as bentonite and zeolite. The leachant solutions except for some bentonite solutions reduced the glass leach rate compared with that measured in distilled water. The extent of the reduction was a function of silicon concentration in solution. The bentonite solutions enhanced the glass dissolution rate by a factor of 2 to 3 at low bentonite/water ratios but the effect was found to be less important at high bentonite/water ratios and in the long-term experiment. Addition of granite and zeolite to the bentonite solutions decreased the leach rate below the value measured in distilled water.

The Effects of Silicic Acid, Aluminate Ion Activity And Hydrosilicate Gel Development on the Dissolution Rate of a Simulated British Magnox Waste Glass

1999 ◽  
Vol 556 ◽  
Author(s):  
P. K. Abraitis ◽  
B. P. McGrail ◽  
D. P. Trivedi
Keyword(s):  
Dissolution Rate ◽  
Secondary Phase ◽  
Waste Glass ◽  
Alkaline Media ◽  
Glass Dissolution ◽  
Rate Of Dissolution ◽  
Flow Through ◽  
Low Levels ◽  
Aluminium Species

AbstractThe dissolution rate of a simulated Magnox waste glass has been investigated in single-pass flow-through experiments designed to investigate the role of Al and Si in the dissolution process. The results indicate that both Al and Si species suppress the rate of dissolution. These effects may be modelled using a combined Al/Si affinity term in a conventional glass dissolution rate law. Aluminium species may also play an inhibitory role when present at relatively high solution activities. In Si-rich alkaline media, the concentration of aluminium is controlled to very low levels by the development of secondary aluminosilicate phases. Removal of Al by secondary phase precipitation results in dissolved Al activities below that required to reach ‘saturation’ with respect to the glass.

scholarly journals Predicting radioactive waste glass dissolution with machine learning

2020 ◽  
Vol 533 ◽  
pp. 119852 ◽  
Author(s):  
Joseph N.P. Lillington ◽  
Thomas L. Goût ◽  
Mike T. Harrison ◽  
Ian Farnan
Keyword(s):  
Machine Learning ◽  
Radioactive Waste ◽  
Waste Glass ◽  
Glass Dissolution

scholarly journals Evaluating the temperature dependence of Magnox waste glass dissolution

2019 ◽  
Vol 518 ◽  
pp. 75-84 ◽  
Author(s):  
Thomas L. Goût ◽  
Mike T. Harrison ◽  
Ian Farnan
Keyword(s):  
Temperature Dependence ◽  
Waste Glass ◽  
Glass Dissolution

The kinetics and mechanisms of simulated British Magnox waste glass dissolution as a function of pH, silicic acid activity and time in low temperature aqueous systems

2000 ◽  
Vol 15 (9) ◽  
pp. 1399-1416 ◽  
Author(s):  
P.K. Abraitis ◽  
F.R. Livens ◽  
J.E. Monteith ◽  
J.S. Small ◽  
D.P. Trivedi ◽  
...  
Keyword(s):  
Low Temperature ◽  
Silicic Acid ◽  
Waste Glass ◽  
Aqueous Systems ◽  
Glass Dissolution

scholarly journals Impacts of lithium on Magnox waste glass dissolution

2019 ◽  
Vol 517 ◽  
pp. 96-105 ◽  
Author(s):  
Thomas L. Goût ◽  
Mike T. Harrison ◽  
Ian Farnan
Keyword(s):  
Waste Glass ◽  
Glass Dissolution
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