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Sunday, April 26, 2020 | History

3 edition of Retardation of Radionuclide Transport by Fracture Flow in Granite and Argillaceous Rocks (Nuclear Science and Technology (European Comm Info Serv)) found in the catalog.

Retardation of Radionuclide Transport by Fracture Flow in Granite and Argillaceous Rocks (Nuclear Science and Technology (European Comm Info Serv))

M.L. Bradbury

Retardation of Radionuclide Transport by Fracture Flow in Granite and Argillaceous Rocks (Nuclear Science and Technology (European Comm Info Serv))

  • 257 Want to read
  • 6 Currently reading

Published by European Communities .
Written in English

    Subjects:
  • Radioactive Waste Disposal

  • The Physical Object
    FormatPaperback
    ID Numbers
    Open LibraryOL12907063M
    ISBN 109282563669
    ISBN 109789282563663

    Abstract. Crystalline basement rocks are considered as potential host formations for the disposal of radioactive waste in several countries. In northern Switzerland, six boreholes were drilled into the sediment-covered basement, and water-conducting features intersected by the boreholes were identified by hydraulic testing by: 4. The permeability of the granite has been found not to be simply a function of fracture frequency, long sections of highly fractured rock having no associated flow under test conditions. While flow paths have been found to become less frequent with depth, flow rates do not vary over the depths studied, the highest flow rate recorded at the site. Numerical ground-water flow/transport models, used carefully, may be able to simulate flow in discrete fractures or fracture zones. Even though'the models are based upon porous-media assumptions, careful discretization can allow one to incorporate a few high-permeability fractures or fracture . Previous chapters have addressed fracture geometry, physical and geomechanical properties of single fractures, fracture detection, and the interpretation of hydraulic and tracer of these elements must be integrated when developing a mathematical model to represent fluid flow and solute transport .


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Retardation of Radionuclide Transport by Fracture Flow in Granite and Argillaceous Rocks (Nuclear Science and Technology (European Comm Info Serv)) by M.L. Bradbury Download PDF EPUB FB2

Transport of iodide and sodium has been studied by means of block fracture and core column experiments to evaluate the simplified radionuclide transport concept. The objectives were to examine the processes causing retention in solute transport, especially matrix diffusion, and to estimate their importance during transport in different scales Cited by: JOURNAL OF Contaminant Hydrology ELSEVIER Journal of Contaminant Hydrology 26 () Radionuclide transport and retardation in rock fracture Retardation of Radionuclide Transport by Fracture Flow in Granite and Argillaceous Rocks book crushed rock column experiments P.

H~51tt~i a, *, M. Retardation of Radionuclide Transport by Fracture Flow in Granite and Argillaceous Rocks book a M. Hakanen a T. Huitti a A. Hautoj~rvi b, A. Lindberg c a University of Helsinki, Department of Chemistry, Laboratory of Radiochemistry, P.O.

FIN-O, Helsinki Cited by: Deep and stable geological formations with low permeability have been considered for high level waste definitive repository. A common problem is the modeling of radionuclide migration in a fractured medium. Initially, we considered a system consisting of a rock matrix with a single planar fracture in water saturated porous rock.

Transport in the fracture is assumed to obey an advection Cited by: 6. Stochastic Differential Equation Fracture Rock Neutron Transport Fracture Orientation Radionuclide Transport These keywords were added by machine and not by the authors.

This process is experimental and the keywords may be updated as the learning algorithm by: 1. Radionuclide transport in fractured granite interface zones Article in Physics and Chemistry of the Earth Parts A/B/C 33(14) December with 25 Reads How we measure 'reads'.

Temperature and pressure of the Cs solution are monitored during the radionuclide transport in granite sample. Solution that passed through the rock specimen is taken from the discharge hole.

Bradbury M.H. and Green A. (a): Retardation of Radionuclide Transport by Fracture Flow in Granite and Argillaceous Rocks, Nuclear Science and Technology Report EURCommission of the European Communities, Brussels. Introduction. Matrix diffusion is recognized as an important process in retarding radionuclide transport in fractured rocks.

In the last three decades, there has been an increased appreciation of the importance of matrix diffusion in the transport of solutes and implications in contaminant remediation and waste management (e.g., Neretnieks,Grisak and Pickens,Abelin et al Cited by: on fracture flow and solute transport in fractured rocks, two fracture-matrix models with and without a fracture dead-end are built for present num erical study.

By using a travel time description of radionuclide transport in rock fractures, we decompose the transport problem into a one-dimensional mass transfer problem along a distribution of transport pathways and a multi-dimensional flow problem in the fractured bedrock.

The hydraulic/flow problem is solved based on Retardation of Radionuclide Transport by Fracture Flow in Granite and Argillaceous Rocks book statistical discrete-fracture. Retardation of mobile radionuclides in granitic rock fractures by matrix diffusion Article in Physics and Chemistry of the Earth Parts A/B/C 33() December with 21 Reads.

The retardation effect of radionuclides (RNs) is a key factor to comprehend the performance of the geological disposal system. Since natural rock includes various minerals, the physical and. III/1 Retardation of mobile radionuclides in granitic rock fractures by matrix diffusion P.

Hölttäa,*, A. Poterib, M. Siitari-Kauppi a, N. Huittinen a University of Helsinki, Laboratory of Radiochemistry, Department of Chemistry, P.O. FIN, Finland bTechnical Research Centre of Finland, P.O. BoxFIN VTT, Finland article info. @article{osti_, title = {Radionuclide Transport in Fracture-Granite Interface Zones}, author = {Hu, Q and Mori, A}, abstractNote = {In situ radionuclide migration experiments, followed by excavation and sample characterization, were conducted in a water-conducting shear zone at the Grimsel Test Site (GTS) in Switzerland to study diffusion paths of radionuclides in fractured granite.

Note that, from the perspective of radionuclide release to the biosphere, diffusion is a retardation process in systems where fracture flow dominates, in contrast to matrix-dominated systems, such as Opalinus Clay (and argillaceous media in general), where it represents a transport by: 3.

Modeling of radionuclide transport in fractured tuffaceous rock Forward formulation. The fracture transport experiments were modeled using the one-dimensional advection-dispersion equation with one-dimensional diffusion into the surrounding matrix perpendicular to the flow direction in fractures (Wu et al., ).Cited by: groundwater flow at Ruprechtov site can be developed.

On the other hand it includes the characterization of the Erzgebirge granites and the interface granite-kaolin-clay/ignite. The aim is to reach a better knowledge about uranium release from granite and enrichment processes in the argillaceous.

Ota K.; Alexander W.R.; Frieg B. (): Nagra/PNC field studies on radionuclide retardation in fractured crystalline rocks in the Grimsel Test Site, Switzerland [in Japanese].- Annual Meeting of the Atomic Energy Society of Japan, March   Underground nuclear weapon testing produces radionuclide gases which may seep to the surface.

Barometric pumping of gas through explosion-fractured rock is Cited by: The flow in individual fractures seems to take place in permeable sections making up only a minor part of the fracture.

The matrix of the rock is porous and dissolved species can move in and out of the stagnant water in the pores by by: 5. Conference: Development and Validation of a Fracture Model for the Granite Rocks at Mizunami Underground Research Laboratory Japan.

and development and revision of numerical models of groundwater flow and radionuclide transport. Agreement on a contaminant boundary for the site and a corrective action plan was reached in rock with small fractures which may conduct water.

Besides these induced flow paths, the bedrock includes natural groundwater-conducting fractures. Together with bentonite buffer and backfilled tunnel, the fractures form the possible radionuclide transport routes in a.

Among other input data, geochemical parameters to describe the transport and retardation of radionuclides in the argillaceous rocks considered and in compacted bentonite are required. In the present report, a comprehensive set of diffusion parameters for all clay host rocks, confining units and compacted bentonite is derived.

Modelling Radioactivity in the Environment 1 (ed), Modelling Radioactivity in the Environment Chapter 5 Modelling radionuclide transport in the geological environment: a case study from the field of radioactive waste disposal.

Russell Alexander1*, Paul A. Smith2 and Ian G. McKinley1 1. Solute transport in the fractured porous confined aquifer is modeled by the advection-dispersion equation with fractional time derivative of order γ ⁠, which may vary from 0 to ting for diffusion in the surrounding rock mass leads to the introduction of an additional fractional time derivative of order 1 ∕ 2 in the equation for solute : Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida.

Suggested Citation: "1 Rock Fractures and Fluid Flow: Practical Problems." National Research Council. Rock Fractures and Fluid Flow: Contemporary Understanding and Applications. Washington, DC: The National Academies Press. doi: / F ractures are mechanical breaks in rocks; they originate from strains that arise from stress.

@article{osti_, title = {Radionuclide migration: laboratory experiments with isolated fractures}, author = {Rundberg, R S and Thompson, J L and Maestas, S}, abstractNote = {Laboratory experiments examining flow and element migration in rocks containing isolated fractures have been initiated at the Los Alamos National Laboratory.

Techniques are being developed to establish simple. 8 Diffusion Decay/growth Mathematical Model Transport in the matrix Transport in the fracture CF:Concentration of dissolved nuclide per unit volume of the water in the fracture[mol/m3] CM:Concentration of dissolved nuclide per unit volume of the water in the matrix[mol/m3] DpM:Pore water diffusion coefficient in the matrix [m2/yr] FWS:Flow wetted surface area[-].

Application to the Development of Preferential Flow Paths in Fractured Rocks [67] The present study illustrates the potential of carbonate‐associated minerals to substantially modify the transport mechanism within a fracture. In a pure limestone fracture, transport is expected to be advective and dispersive dominant in the flow by: Present models of radionuclide transport along a flow path can handle such effects and also the more general case where the properties vary along the flow path as well as in the rock matrix at different distances from the fracture surface.

A three‐dimensional variable aperture fracture network model for flow and transport in fractured rocks was developed. The model generates both the network of fractures and the variable aperture distribution of individual fractures in the network.

Before solving for the flow and transport of the whole network, a library of single‐fracture permeabilities and particle transport residence time. @article{osti_, title = {Some anomalous features of flow and solute transport arising from fracture aperture variability}, author = {Moreno, L and Neretnieks, I and Tsang, Chinfu and Tsang, Yvonne}, abstractNote = {Model fractures with variable apertures are generated by a statistical method, and water flow and tracer transport in these fractures are calculated.

Marschall, P., Horseman, S., & Gimmi, T. Characterisation of gas transport properties of the Opalinus Clay, a potential host rock formation for radioactive waste disposal. Oil & Gas Science and Technology, 60(1), – Google ScholarCited by: Application of various site characterisation techniques and analysis methods with a view to predicting and validating groundwater flow and nuclide transport in an unexplored volume of Stripa granite.

Verification of the use of different materials and techniques for sealing water-bearing fractures in the Stripa granite. Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit to get more information about this book, to buy it in print, or to download it as a free PDF.

This publication contains extended abstracts of papers presented at the International Symposium ''Dynamics of Fluids in Fractured Rocks: Concepts and Recent Advances'' held at Ernest Orlando Lawrence Berkeley National Laboratory on FebruaryAuthor: B. Faybishenko. Deep geological disposal of high-level radioactive waste in a repository with a system of engineered and natural barriers has been recognized as an appropriate disposal concept by Chinese authorities sinceand both crystalline rocks and argillaceous rocks are considered as the candidate host rocks for a high-level waste (HLW) disposal.

GWFTS Task 9B: Long-term Transport Relevance to GDSA Generation and representation of realistic fracture networks Fluid flow & transport in fracture networks Mapping tools (dfnWorks to PFLOTRAN) Dual continuum; matrix diffusion There's a little ambiguity over there among the bluebells, and other theater poems.

Graphics by Marilyn   The following six types of parameters are estimated, in which the first three are common flow and transport parameters which are estimated from tritium experiment data, and the other three are tracer-specific transport and sorption parameters:(1) mean fluid residence time in fractures (τ), h,(2) fracture half aperture (b), cm.

Energy pdf economic impacts of projected freight transportation improvements. Final report by R. H Leilich () 2 editions published An essay on the nature of diseases by A Green (Book .Application of various site characterisation techniques and analysis methods with a view to predicting and validating groundwater flow and nuclide transport in an unexplored volume of Stripa granite Verification of the use of different materials and techniques for sealing water-bearing fractures in the Stripa granite.Radionuclide transport in fracture-granite interface zones.

11th International Conference ebook Chemistry and Migration Behavior of Actinides and Fission Products in the Geosphere (Migration’07), pp. –, August 26–31,Munich, Germany. Möri, A., M. Mazurek, and Q.H. Hu.