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Title: Monte Carlo Simulations of Coupled Diffusion and Surface Reactions during the Aqueous Corrosion of Borosilicate Glasses

Journal Article · · Journal of Non-crystalline Solids, 408:142-149

Borosilicate nuclear waste glasses develop complex altered layers as a result of coupled processes such as hydrolysis of network species, condensation of Si species, and diffusion. However, diffusion has often been overlooked in Monte Carlo models of the aqueous corrosion of borosilicate glasses. Therefore, three different models for dissolved Si diffusion in the altered layer were implemented in a Monte Carlo model and evaluated for glasses in the compositional range (75-x) mol% SiO2 (12.5+x/2) mol% B2O3 and (12.5+x/2) mol% Na2O, where 0 ≤ x ≤ 20%, and corroded in static conditions at a surface-to-volume ratio of 1000 m-1. The three models considered instantaneous homogenization (M1), linear concentration gradients (M2), and concentration profiles determined by solving Fick’s 2nd law using a finite difference method (M3). Model M3 revealed that concentration profiles in the altered layer are not linear and show changes in shape and magnitude as corrosion progresses, unlike those assumed in model M2. Furthermore, model M3 showed that, for borosilicate glasses with a high forward dissolution rate compared to the diffusion rate, the gradual polymerization and densification of the altered layer is significantly delayed compared to models M1 and M2. Models M1 and M2 were found to be appropriate models only for glasses with high release rates such as simple borosilicate glasses with low ZrO2 content.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1208740
Report Number(s):
PNNL-SA-102399; 47580; AF5805010
Journal Information:
Journal of Non-crystalline Solids, 408:142-149, Journal Name: Journal of Non-crystalline Solids, 408:142-149
Country of Publication:
United States
Language:
English

References (36)

Radioactive Waste: The Size of the Problem journal June 1997
The Nuclear Fuel Cycle: A Role for Mineralogy and Geochemistry journal December 2006
An international initiative on long-term behavior of high-level nuclear waste glass journal June 2013
Nuclear Waste Glasses - How Durable? journal December 2006
Current Understanding and Remaining Challenges in Modeling Long-Term Degradation of Borosilicate Nuclear Waste Glasses journal November 2013
Contribution of atom-probe tomography to a better understanding of glass alteration mechanisms: Application to a nuclear glass specimen altered 25years in a granitic environment journal June 2013
Nuclear Glass Durability: New Insight into Alteration Layer Properties journal August 2011
Morphological evolution of alteration layers formed during nuclear glass alteration: new evidence of a gel as a diffusive barrier journal March 2004
Solid-state NMR examination of alteration layers on nuclear waste glasses journal June 2013
Insight into silicate-glass corrosion mechanisms journal October 2008
Contribution of Monte Carlo Modeling to Understanding the Alteration of Nuclear Glasses by Water journal July 2006
Monte Carlo simulations of the dissolution of borosilicate glasses in near-equilibrium conditions journal May 2012
New techniques for modelling glass dissolution journal September 2001
Topography of borosilicate glass reacting interface under aqueous corrosion journal November 2013
First-Principles Study of Hydrolysis Reaction Barriers in a Sodium Borosilicate Glass journal November 2013
Modelling Glass Dissolution with a Monte Carlo Technique journal January 1995
Testing the Grambow Glass Dissolution Model by Comparing it With Monte Carlo Simulation Results journal January 1999
A General Rate Equation for Nuclear Waste Glass Corrosion journal January 1984
First-order dissolution rate law and the role of surface layers in glass performance assessment journal September 2001
Numerical modelling of glass dissolution: gel layer morphology journal September 2001
Monte Carlo Modelling of Glass Dissolution: Comparison with Experiments journal January 2000
Leaching of borosilicate glasses. II. Model and Monte-Carlo simulations journal September 2004
Monte Carlo simulations of borosilicate glass corrosion: predictions for morphology and kinetics journal October 2004
Aqueous alteration of five-oxide silicate glasses: Experimental approach and Monte Carlo modeling journal January 2008
Why Do Certain Glasses with a High Dissolution Rate Undergo a Low Degree of Corrosion? journal March 2011
Monte Carlo simulations of the dissolution of borosilicate and aluminoborosilicate glasses in dilute aqueous solutions journal September 2011
Monte Carlo simulations of the corrosion of aluminoborosilicate glasses journal October 2013
The effect of composition on the leaching of three nuclear waste glasses: R7T7, AVM and VRZ journal November 2005
Aluminoborosilicate waste glass dissolution under alkaline conditions at 40°C: implications for a chemical affinity-based rate equation journal January 2008
Leaching of borosilicate glasses. I. Experiments journal September 2004
Alteration kinetics of a simplified nuclear glass in an aqueous medium: effects of solution chemistry and of protective gel properties on diminishing the alteration rate journal July 2000
Effect of composition on the short-term and long-term dissolution rates of ten borosilicate glasses of increasing complexity from 3 to 30 oxides journal September 2012
SON68 nuclear glass dissolution kinetics: Current state of knowledge and basis of the new GRAAL model journal October 2008
Application of the GRAAL model to leaching experiments with SON68 nuclear glass in initially pure water journal August 2009
A mechanistic model for understanding nuclear waste glass dissolution journal August 1992
Development of empirical potentials for sodium borosilicate glass systems journal September 2011

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