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INTRAVAL test case 1b - modelling results

Technical Report:

Abstract

This report presents results obtained within Phase I of the INTRAVAL study. Six models are fitted to the results of four infiltration experiments with {sup 233}U tracer on small samples of crystalline bore cores originating from deep drillings in Northern Switzerland. Four of these are dual porosity media models taking into account advection and dispersion in water conducting zones (either tubelike veins or planar fractures), matrix diffusion out of these into pores of the solid phase, and either non-linear or linear sorption of the tracer onto inner surfaces. The remaining two are equivalent porous media models (excluding matrix diffusion) including either non-linear sorption onto surfaces of a single fissure family or linear sorption onto surfaces of several different fissure families. The fits to the experimental data have been carried out by Marquardt-Levenberg procedure yielding error estimates of the parameters, correlation coefficients and also, as a measure for the goodness of the fits, the minimum values of the {chi}{sup 2} merit function. The effects of different upstream boundary conditions are demonstrated and the penetration depth for matrix diffusion is discussed briefly for both alternative flow path scenarios. The calculations show that the dual porosity media models are significantly more appropriate to  More>>
Authors:
Jakob, A; Hadermann, J [1] 
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Publication Date:
Jul 01, 1991
Product Type:
Technical Report
Report Number:
PSI-105
Reference Number:
SCA: 540230; 052002; PA: AIX-23:010945; SN: 92000637692
Resource Relation:
Other Information: PBD: Jul 1991
Subject:
54 ENVIRONMENTAL SCIENCES; 12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; DRILL CORES; RADIONUCLIDE MIGRATION; GRANITES; ADSORPTION; CHEMISORPTION; CORRELATIONS; DIFFUSION; EXPERIMENTAL DATA; MATHEMATICAL MODELS; RADIOACTIVE WASTE DISPOSAL; SWITZERLAND; THEORETICAL DATA; TRACER TECHNIQUES; UNDERGROUND DISPOSAL; URANIUM 233; 540230; 052002; RADIOACTIVE MATERIALS MONITORING AND TRANSPORT; WASTE DISPOSAL AND STORAGE
OSTI ID:
10111859
Research Organizations:
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Other: ON: DE92613460; TRN: CH9100669010945
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
CHN
Size:
39 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Jakob, A, and Hadermann, J. INTRAVAL test case 1b - modelling results. Switzerland: N. p., 1991. Web.
Jakob, A, & Hadermann, J. INTRAVAL test case 1b - modelling results. Switzerland.
Jakob, A, and Hadermann, J. 1991. "INTRAVAL test case 1b - modelling results." Switzerland.
@misc{etde_10111859,
title = {INTRAVAL test case 1b - modelling results}
author = {Jakob, A, and Hadermann, J}
abstractNote = {This report presents results obtained within Phase I of the INTRAVAL study. Six models are fitted to the results of four infiltration experiments with {sup 233}U tracer on small samples of crystalline bore cores originating from deep drillings in Northern Switzerland. Four of these are dual porosity media models taking into account advection and dispersion in water conducting zones (either tubelike veins or planar fractures), matrix diffusion out of these into pores of the solid phase, and either non-linear or linear sorption of the tracer onto inner surfaces. The remaining two are equivalent porous media models (excluding matrix diffusion) including either non-linear sorption onto surfaces of a single fissure family or linear sorption onto surfaces of several different fissure families. The fits to the experimental data have been carried out by Marquardt-Levenberg procedure yielding error estimates of the parameters, correlation coefficients and also, as a measure for the goodness of the fits, the minimum values of the {chi}{sup 2} merit function. The effects of different upstream boundary conditions are demonstrated and the penetration depth for matrix diffusion is discussed briefly for both alternative flow path scenarios. The calculations show that the dual porosity media models are significantly more appropriate to the experimental data than the single porosity media concepts. Moreover, it is matrix diffusion rather than the non-linearity of the sorption isotherm which is responsible for the tailing part of the break-through curves. The extracted parameter values for some models for both the linear and non-linear (Freundlich) sorption isotherms are consistent with the results of independent static batch sorption experiments. From the fits, it is generally not possible to discriminate between the two alternative flow path geometries. On the basis of the modelling results, some proposals for further experiments are presented. (author)}
place = {Switzerland}
year = {1991}
month = {Jul}
}