Effect of gamma radiation on groundwater chemistry and glass leaching as related to the NNWSI repository site

Abrajano, T.A.; Bates, J. K.; Ebert, W. L.; Gerding, T.J.

doi:10.2172/59924

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…Under steady-state conditions, the mass of secondary phases increases with time [9]. In open-system (flow-through) experiments, the rate of release of most elements is approximately constant or slowly decreases with time.…”

Section: Overview Of Glass Dissolution Processesmentioning

confidence: 99%

Critical review of glass performance modeling

Bourcier

1994

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Section: Overview Of Glass Dissolution Processesmentioning

confidence: 99%

Critical review of glass performance modeling

Bourcier

1994

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“…Steady-state conditions are commonly observed during glass dissolution in which the rates of water diffusion and ion exchange are equal to the rate at which the glass network dissolves. Steady-state conditions are evidenced by the tendency for the glass diffusion layer to remain constant in thickness while the glass dissolves away and the mass of secondary phases increases with time (Abrajano et al, 1986). In open-system experiments, the rate of release of most elements is approximately constant or slowly decreasing with time.…”

Section: Glass-dissolution Mechanismmentioning

confidence: 99%

Waste form characteristics report, revision 1.3

Leider¹,

Stout²

1998

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“…Steady-state conditions are commonly observed during glass dissolution where the rates of water diffusion and ion exchange are equal to the rate at which the glass network dissolves. Steady state conditions are evidenced by the tendency for the glass diffusion layer to remain constant in thickness while the glass dissolves away and the mass of secondary phases increases with time 6 . In open system experiments, the rate of release of most elements is approximately constant or slowly decreasing with time.…”

Section: If/ Diffusion Layermentioning

confidence: 99%

Waste Glass Corrosion Modeling: Comparison with Experimental Results

Bourcier

1993

MRS Proc.

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Models for borosilicate glass dissolution must account for the processes of (1) kinetically-eontrolled network dissolution, (2) precipitation of secondary phases, (3) ion exchange, (4) rate-limiting diffusive transport of silica through a hydrous surface reaction layer, and (5) specific glass surface interactions with dissolved cations and anions. Current long-term corrosion models for borosilicate glass employ a rate equation consistent with transition state theory embodied in a geochemical reactionpath modeling program that calculates aqueous phase speriation and mineral precipitation/dissolution. These models are currently under development. Future experimental and modeling work to better quantify the rate-controlling processes and validate these models are necessary before ihe models can be used in repository performance assessment calculations. INTRODUCTIONA chemical model of glass corrosion will be used to predict the rates of release of radionuclides from borosilicate glass waste forms in high-level waste repositories. The model will be used both to calculate the rate of degradation of the glass, and also to predict the effects of chemical interactions between the glass and repository materials such as spent fuel, canister and container materials, backfill, cements, grouts, and others. Coupling between the degradation processes affecting all these materials is expected. The glass corrosion model must therefore be mechanistic, and not a simple empirical extrapolation of experimental glass degradation rates. Empirical extrapolations cannot be extended with confidence to repository time frames of over 10,000 years, and the multiple coupled interactions cannot all be explored experimentally in a reasonable time period.The purpose of this paper is to provide a summary of current work on developing chemical models for borosilicate glass corrosion. We start with a brief overview of the glass corrosion process and then show how chemical models have been applied to a variety of glass corrosion experiments. This summary focuses on dissolution behavior of borosilicate glass compositions currently anticipated for use as waste forms under repository-relevant conditions. The models described here cannot be expected to predict glass corrosion rates under conditions significantly different from these.

show abstract

Effect of gamma radiation on groundwater chemistry and glass leaching as related to the NNWSI repository site

Cited by 4 publications

References 2 publications

Critical review of glass performance modeling

Critical review of glass performance modeling

Waste form characteristics report, revision 1.3

Waste Glass Corrosion Modeling: Comparison with Experimental Results

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