Analytical performance models for geologic repositories. Volume 2

Pigford, T.H.; Fujita, A.; Kanki, Tatsuo; Kobayashi, Akira; Lung, H.; Ting, Du; Sato, Yoshimi; Zavoshy, S.J.

doi:10.2172/6180590

Cited by 5 publications

(8 citation statements)

References 1 publication

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“…Chambre et al ( , ) developed an analytical model for the dissolution of low-solubility species from a cylindrical waste form imbedded in porous rock or soil. Matyskiela () applied this model to predict dissolution rates of Comp B particles in soil under the assumption that the RDX and TNT components dissolve independently.…”

Section: Resultsmentioning

confidence: 99%

Dissolution of Composition B Detonation Residuals

Taylor

Perovich

et al. 2005

Environ. Sci. Technol.

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Composition B (Comp B) detonation residuals pose environmental concern to the U.S. Army because hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), a constituent, has contaminated groundwater near training ranges. To mimic their dissolution on surface soils, we dripped water at 0.51 ml/h onto individual Comp B particles (0.1-2.0 mg) collected from the detonation of 81-mm mortars. Analyses of the effluent indicate thatthe RDX and 2,4,6-trinitrotoluene (TNT) in Comp B do not dissolve independently. Rather, the relatively slow dissolution of RDX controls dissolution of the particle as a whole by limiting the exposed area of TNT. Two dissolution models, a published steady-flow model and a drop-impingement model developed here, provide good agreementwith the data using RDX parameters for time scaling. They predict dissolution times of 6-600 rainfall days for 0.01-100 mg Comp B particles exposed to 0.55 cm/h rainfall rate. These models should bracket the flow regimes for dissolution of detonation residuals on soils, but they require additional data to validate them across the range of particle sizes and rainfall rates of interest.

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Section: Resultsmentioning

confidence: 99%

Dissolution of Composition B Detonation Residuals

Taylor

Perovich

et al. 2005

Environ. Sci. Technol.

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“…By using conformal mapping method, we were able to extend the studies of Walsh [6] and of Chambré et al [8] to more general cases where the fracture is allowed to intersect the canister or the deposition hole at any angle. The two formulations proposed for the volumetric flow rate and for the equivalent flow rate have been validated by numerical examinations, and they have been demonstrated in recent studies [10] to be very useful in quantification of the hydraulic behaviour of a single fracture with spatially variable apertures.…”

Section: And21and/86216mentioning

confidence: 97%

“…(5), comparison between numerical and analytical solutions for the volumetric flow rate has been made. Following the studies of Chambré et al [8] for the case where the flow is taken normal to the axis of the canister, the equivalent flow rate for the solute transport from the canister by diffusion and advection through an infinite large fracture with a parallel plate geometry is given by, 1, where the fracture, subjected to a pressure gradient of 0.003 Pa m -1 along the flow direction, is 10 m long and 10 m wide, and the apertures used fall in the same range as that observed commonly in experimental studies [7].…”

Section: $%675$and7mentioning

confidence: 99%

Fluid Flow and Solute Transport though a Fracture Intersecting a Canister - Analytical Solutions for the Parallel Plate Model

Liu

Neretnieks

2003

MRS Proc.

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In this paper, we are concerned with a specific scenario where a large fracture intersects, at its center, a canister that contains spent nuclear fuel. Assuming that a nuclide is free to release from the canister into groundwater flowing through the fracture, a detailed formulation of the volumetric flow rate and the equivalent flow rate are made for the parallel plate model. The formulas proposed have been validated by numerical examinations; they are not only simple in forms but also universal in applications where the flow may be taken normal, inclined or parallel to the axis of the canister. Of great importance, they provide a convenient way to predict the average properties of fluid flow and solute transport through a single fracture with spatially variable apertures.,1752'8&7,21Fluid flow and solute transport through fractured rock is important in many areas, such as extraction of geothermal energy, production of oil and gas from fractured reservoirs and disposal of nuclear waste in underground repositories. For this reason considerable effort has been placed on characterization and modelling of fractures and fracture systems [1], and in particular, on quantification of the hydraulic behaviour of a single fracture [2], which constitutes the basic building block of realistic models of fluid flow and solute transport in fractured media.To describe adequately the statistical properties of fluid flow and solute transport through a single fracture with spatially variable apertures, the concept of the volumetric flow rate [3] ∫ Ωis commonly used to quantify the ability of the fracture to transmit fluid through its connected space. Similarly, the concept of the equivalent flow rate [4] ∫ Ωis frequently introduced to quantify the ability of the fracture to transmit solute (contaminated water) through its aperture field. Using these two concepts, one can explore conveniently by numerical methods how the flow and transport properties of a fracture are influenced by e.g. the flow direction, the fracture type, the roughness and the degree of spatial correlations of the aperture field. The results obtained, with respect to the distribution of the volumetric and the equivalent flow rate, should, however, be compared with that determined from the simplest case where the fracture is assumed to consist of two perfectly smooth parallel plates. In addition, for the purpose of safety assessment Mat. Res. Soc. Symp. Proc. Vol. 807

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“…The steady-state mass transfer resistance for potential flow of interbed water around the cylinder is calculated from our mass-transfer equations. 11 The steady-state diffusive mass transfer of a species of solubility c. to the interbed aperture is calculated from the analysis by Kang et al 12 through the salt layer. The resulting fractional release of a species with a solubility of 0.001 g/m 3 and the parameters of Table III is shown in Figure 9 as a function of Peclet number.…”

Section: Interbeds: Mass Transport With Flowmentioning

confidence: 99%