Kinetics of Conversion of High-Level Waste to Glass

2000 ◽  
pp. 314-328 ◽  
Author(s):  
P. Izak ◽  
P. Hrma ◽  
M. J. Schweiger
Keyword(s):  
High Level Waste ◽  
High Level ◽  
Kinetics Of

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.

The Kinetics of Spinel Crystallization from a High-Level Waste Glass

1996 ◽  
Vol 465 ◽  
Author(s):  
J. G. Reynolds ◽  
P. Hrma
Keyword(s):  
Volume Fraction ◽  
Treatment Time ◽  
Waste Glass ◽  
High Level Waste ◽  
Avrami Equation ◽  
Kinetic Coefficients ◽  
High Level Nuclear Waste ◽  
Isothermal Heat Treatments ◽  
High Level ◽  
Kinetics Of

ABSTRACTThe kinetics of spinel crystallization from a molten high-iron simulated high-level nuclear waste glass was studied using isothermal heat treatments. Optical microscopy with image analysis was used to measure volume fraction of spinel as a function of heat treatment time and temperature. The Johnson-Mehl-Avrami equation was fitted to data to determine kinetic coefficients for spinel crystallization. The liquidus temperature and Avrami number are TL = 1337K and n = 1.5.

Estimating the Alteration Kinetics of the French Vitrified High-Level Waste Package in a Geologic Repository

1998 ◽  
Vol 123 (1) ◽  
pp. 67-81 ◽  
Author(s):  
Patrick Jollivet ◽  
Michèle Nicolas ◽  
Etienne Vernaz
Keyword(s):  
High Level Waste ◽  
Geologic Repository ◽  
Waste Package ◽  
High Level ◽  
Kinetics Of

scholarly journals Mechanisms and Kinetics of Organic Aging and Characterization of Intermediates in High-Level Waste

2002 ◽  
Author(s):  
Donald M Camaioni ◽  
S Tom Autrey ◽  
Michel Dupuis ◽  
Wendy Shaw
Keyword(s):  
High Level Waste ◽  
High Level ◽  
Kinetics Of

Isothermal Crystallization Kinetics in Simulated High-Level Nuclear Waste Glass

1996 ◽  
Vol 465 ◽  
Author(s):  
John D. Vienna ◽  
Pavel Hrma ◽  
Donald E. Smith
Keyword(s):  
Crystallization Kinetics ◽  
High Level Waste ◽  
Transformation Kinetic ◽  
Isothermal Crystallization Kinetics ◽  
Isothermal Method ◽  
Glass Crystal ◽  
Temperature Transformation ◽  
High Level Nuclear Waste ◽  
High Level ◽  
Kinetics Of

ABSTRACTCrystallization kinetics of a simulated high-level waste (HLW) glass were measured and modelled. Kinetics of acmite growth in the standard HW39–4 glass were measured using the isothermal method. A time-temperature-transformation (TTT) diagram was generated from these data. Classical glass-crystal transformation kinetic models were empirically applied to the crystallization data. These models adequately describe the kinetics of crystallization in complex HLW glasses (i.e., RSquared = 0.908). An approach to measurement, fitting, and use of TTT diagrams for prediction of crystallinity in a HLW glass canister is proposed.

scholarly journals Mechanisms and Kinetics of Organic Aging and Characterization of Intermediates in High Level Waste

2004 ◽  
Author(s):  
Donald M Camaioni ◽  
S Tom Autrey ◽  
Michel Dupuis ◽  
Wendy Shaw
Keyword(s):  
High Level Waste ◽  
High Level ◽  
Kinetics Of

scholarly journals Mechanisms and Kinetics of Organic Aging in High-Level Waste

2001 ◽  
Author(s):  
Donald M Camaioni ◽  
S Tom Autrey ◽  
Michel Dupuis ◽  
Wendy Shaw
Keyword(s):  
High Level Waste ◽  
High Level ◽  
Kinetics Of
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