Radionuclide migration experiments in a natural fracture in a quarried block of granite

Vandergraaf, T. T.; Drew, D. J.; Masuda, Sumio

doi:10.1016/0169-7722(95)00040-2

Cited by 15 publications

(7 citation statements)

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“…The eluted Np from the rock fracture in the other experiments was mainly free uncomplexed neptunyl ion (NpO 2 + ) or negatively charged pseudocolloidal species [9,10,17,18]. And Np(IV) species were not detected in the eluted solutions.…”

Section: The Migration Of 237 Npmentioning

confidence: 89%

“…On the other hand, Np was transported through rock fractures without significant retardation in some other experiments [7][8][9][10]18]. The eluted Np from the rock fracture in the other experiments was mainly free uncomplexed neptunyl ion (NpO 2 + ) or negatively charged pseudocolloidal species [9,10,17,18].…”

Section: The Migration Of 237 Npmentioning

confidence: 99%

“…The other important factor in migration of Np is reaction kinetics. It takes time to reduce Np(V) to Np(IV) and to sorb on the minerals [8,18]. In batch sorption tests, Np sorbed slowly and only a little percentage of Np sorbed for a few days comparing to the final value, while most other nuclides showed fast sorption in early stage [8,18].…”

Section: The Migration Of 237 Npmentioning

confidence: 99%

“…It takes time to reduce Np(V) to Np(IV) and to sorb on the minerals [8,18]. In batch sorption tests, Np sorbed slowly and only a little percentage of Np sorbed for a few days comparing to the final value, while most other nuclides showed fast sorption in early stage [8,18]. In this experiment, the linear velocity (v) of the solution in the fracture was about 6 × 10 −7 m/s, while the others showed much faster velocities [7-10, 17, 18].…”

Section: The Migration Of 237 Npmentioning

confidence: 99%

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Modeling and analysis of the migration of HTO and²³⁷Np in a fractured granite core at the Äspö hard rock laboratory

Park¹,

Kienzler

Vejmelka

et al. 2011

Radiochimica Acta

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Migration characteristics of HTO and 237 Np were analyzed through experiments performed with a fractured granite core in the Chemlab2 probe at the Äspö hard rock laboratory in Sweden. These experimental data covered the elution of HTO and 237 Np as well as information of retained actinides onto the fracture surfaces. The flow field was simulated with a two-dimensional variable aperture channel model. The mass transport process was described with a randomwalk method. Three types of basic migration processes were considered : advection, sorption and matrix diffusion. By a combination of these processes, specific effects of each process on transport were evaluated. The retardation of the neptunium were analysed quantitatively by the model. The results were compared to the experimental findings in terms of the elution curves and of distribution patterns on the fracture surface. The elution curves of HTO were used to determine the hydraulic properties in the fractured core such as the extent of a dispersion effect according to the flow rates. After termination of the migration test, the rock core was opened, and the retained radioactivities onto the fracture surfaces were measured to investigate an extend of 237 Np retardation and the retardation mechanism. A retardation factor was obtained by comparing the simulated results to the distribution of sorbed tracers along the flow path. The validity of sorption data from batch tests was also discussed for estimating migration of sorbing tracers.

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Section: The Migration Of 237 Npmentioning

confidence: 89%

Section: The Migration Of 237 Npmentioning

confidence: 99%

Section: The Migration Of 237 Npmentioning

confidence: 99%

Section: The Migration Of 237 Npmentioning

confidence: 99%

See 2 more Smart Citations

Modeling and analysis of the migration of HTO and²³⁷Np in a fractured granite core at the Äspö hard rock laboratory

Park¹,

Kienzler

Vejmelka

et al. 2011

Radiochimica Acta

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show abstract

“…The factors affecting the transport of colloidal particles in fractured porous media are increasing that interest since the fractures' potential role as favorable pathways for colloids [6][7][8]. These are mainly due to: (1) large flow paths; (2) high flow velocities compared to the surrounding porous matrix; and (3) lack of diffusion from the fracture aperture to the matrix, especially in low-* Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

A comparison of clay colloid and artificial microsphere transport in natural discrete fractures

Zvikelsky

Weisbrod

Dody³

2008

Journal of Colloid and Interface Science

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Solute transport in a single fracture with negligible matrix permeability: 1. fundamental mechanisms

Bodin

Delay

Marsily

2003

Hydrogeology Journal

167

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International audienceThis report describes the fracture-scale mechanisms acting on solute transport in fractured aquifers under natural-flow conditions. It focuses on low-permeability rocks where advection in the matrix is negligible compared with that in fractures. The relevant transport mechanisms detailed have been identified by experimental and theoretical studies over the past 30 years: advection and hydrodynamic dispersion, channeling effects, matrix diffusion, and sorption reactions. This review is intended to emphasize the fundamental concepts and to draw up a reader's guide through an extensive bibliography by linking key problems to key papers. These concepts might be integrated into transport models, but their influence at the large scale, however, remains an open question that is not dealt with in this review

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Radionuclide migration experiments in a natural fracture in a quarried block of granite

Cited by 15 publications

References 0 publications

Modeling and analysis of the migration of HTO and²³⁷Np in a fractured granite core at the Äspö hard rock laboratory

Modeling and analysis of the migration of HTO and²³⁷Np in a fractured granite core at the Äspö hard rock laboratory

A comparison of clay colloid and artificial microsphere transport in natural discrete fractures

Solute transport in a single fracture with negligible matrix permeability: 1. fundamental mechanisms

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Radionuclide migration experiments in a natural fracture in a quarried block of granite

Cited by 15 publications

References 0 publications

Modeling and analysis of the migration of HTO and237Np in a fractured granite core at the Äspö hard rock laboratory

Modeling and analysis of the migration of HTO and237Np in a fractured granite core at the Äspö hard rock laboratory

A comparison of clay colloid and artificial microsphere transport in natural discrete fractures

Solute transport in a single fracture with negligible matrix permeability: 1. fundamental mechanisms

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Product

Resources

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Modeling and analysis of the migration of HTO and²³⁷Np in a fractured granite core at the Äspö hard rock laboratory

Modeling and analysis of the migration of HTO and²³⁷Np in a fractured granite core at the Äspö hard rock laboratory