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INTRAVAL Finnsjoen Test - modelling results for some tracer experiments

Technical Report:

Abstract

This report presents the results within Phase II of the INTRAVAL study. Migration experiments performed at the Finnsjoen test site were investigated. The study was done to gain an improved understanding of not only the mechanisms of tracer transport, but also the accuracy and limitations of the model used. The model is based on the concept of a dual porosity medium, taking into account one dimensional advection, longitudinal dispersion, sorption onto the fracture surfaces, diffusion into connected pores of the matrix rock, and sorption onto matrix surfaces. The number of independent water carrying zones, represented either as planar fractures or tubelike veins, may be greater than one, and the sorption processes are described either by linear or non-linear Freundlich isotherms assuming instantaneous sorption equilibrium. The diffusion of the tracer out of the water-carrying zones into connected pore space of the adjacent rock is calculated perpendicular to the direction of the advective/dispersive flow. In the analysis, the fluid flow parameters are calibrated by the measured breakthrough curves for the conservative tracer (iodide). Subsequent fits to the experimental data for the two sorbing tracers strontium and cesium then involve element dependent parameters providing information on the sorption processes and on its representation  More>>
Authors:
Jakob, A; Hadermann, J [1] 
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Publication Date:
Sep 01, 1994
Product Type:
Technical Report
Report Number:
PSI-94-12
Reference Number:
SCA: 540230; 052002; PA: AIX-26:008012; EDB-95:009815; SN: 95001301027
Resource Relation:
Other Information: PBD: Sep 1994
Subject:
54 ENVIRONMENTAL SCIENCES; 12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; GRANITES; LABORATORIES; SWEDEN; ADSORPTION; CESIUM IONS; DIFFUSION; EXPERIMENTAL DATA; HYDRAULIC CONDUCTIVITY; IODINE IONS; ISOTHERMS; MATHEMATICAL MODELS; POROSITY; RADIONUCLIDE MIGRATION; STRONTIUM IONS; THEORETICAL DATA; TRACER TECHNIQUES; 540230; 052002; RADIOACTIVE MATERIALS MONITORING AND TRANSPORT; WASTE DISPOSAL AND STORAGE
OSTI ID:
10103935
Research Organizations:
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Other: ON: DE95610898; TRN: CH9400364008012
Availability:
OSTI; NTIS; INIS
Submitting Site:
CHN
Size:
82 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Jakob, A, and Hadermann, J. INTRAVAL Finnsjoen Test - modelling results for some tracer experiments. Switzerland: N. p., 1994. Web.
Jakob, A, & Hadermann, J. INTRAVAL Finnsjoen Test - modelling results for some tracer experiments. Switzerland.
Jakob, A, and Hadermann, J. 1994. "INTRAVAL Finnsjoen Test - modelling results for some tracer experiments." Switzerland.
@misc{etde_10103935,
title = {INTRAVAL Finnsjoen Test - modelling results for some tracer experiments}
author = {Jakob, A, and Hadermann, J}
abstractNote = {This report presents the results within Phase II of the INTRAVAL study. Migration experiments performed at the Finnsjoen test site were investigated. The study was done to gain an improved understanding of not only the mechanisms of tracer transport, but also the accuracy and limitations of the model used. The model is based on the concept of a dual porosity medium, taking into account one dimensional advection, longitudinal dispersion, sorption onto the fracture surfaces, diffusion into connected pores of the matrix rock, and sorption onto matrix surfaces. The number of independent water carrying zones, represented either as planar fractures or tubelike veins, may be greater than one, and the sorption processes are described either by linear or non-linear Freundlich isotherms assuming instantaneous sorption equilibrium. The diffusion of the tracer out of the water-carrying zones into connected pore space of the adjacent rock is calculated perpendicular to the direction of the advective/dispersive flow. In the analysis, the fluid flow parameters are calibrated by the measured breakthrough curves for the conservative tracer (iodide). Subsequent fits to the experimental data for the two sorbing tracers strontium and cesium then involve element dependent parameters providing information on the sorption processes and on its representation in the model. The methodology of fixing all parameters except those for sorption with breakthrough curves for non-sorbing tracers generally worked well. The investigation clearly demonstrates the necessity of taking into account pump flow rate variations at both boundaries. If this is not done, reliable conclusions on transport mechanisms or geometrical factors can not be achieved. A two flow path model reproduces the measured data much better than a single flow path concept. (author) figs., tabs., 26 refs.}
place = {Switzerland}
year = {1994}
month = {Sep}
}