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Title: Radionuclide migration: laboratory experiments with isolated fractures

Abstract

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 fracture flow systems which are appropriate to models using analytical solutions to the matrix diffusion-flow equations, such as those of I. Neretnieks [I. Neretnieks, Diffusion in the Rock Matrix: An Important Factor in Radionuclide Retardation? J. Geophys. Res. 85, 4379 (1980).] These experiments are intended to be intermediate steps toward larger scale field experiments where it may become more difficult to establish and control the parameters important to nuclide migration in fractured media. Laboratory experiments have been run on fractures ranging in size from 1 to 20 cm in length. The hydraulic flow in these fractures was studied to provide the effective apertures. The flows established in these fracture systems are similar to those in the granite fracture flow experiments of Witherspoon et al. [P.A. Witherspoon, J.S.Y. Wang, K. Iwai, and J.E. Gale, Validity of Cubic Law for Fluid Flow in a Deformable Rock Fracture, Lawrence Berkeley Laboratory report LBL-9557 (October 1979).] Traced solutions containing {sup 85}Sr and {sup 137}Cs were flowed through fractures in Climax Stock granite and welded tuff (Bullfrogmore » and Tram members, Yucca Mountain, Nevada Test Site). The results of the elutions through granite agree with the matrix diffusion calculations based on independent measurements of K/sub d/. The results of the elutions through tuff, however, agree only if the K/sub d/ values used in the calculations are lower than the K/sub d/ values measured using a batch technique. This trend has been previously observed in chromatographic column experiments with tuff. 5 figures, 3 tables.« less

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM
OSTI Identifier:
59132
Report Number(s):
CONF-811122-Pt.1
Resource Type:
Book
Resource Relation:
Conference: Annual meeting of the Materials Research Society, Boston, MA (United States), 16-19 Nov 1981; Other Information: PBD: 1982; Related Information: Is Part Of Scientific basis for nuclear waste management; Topp, S.V. (ed.); PB: 239-248 p.
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; 54 ENVIRONMENTAL SCIENCES; RADIOACTIVE WASTE DISPOSAL; RADIONUCLIDE MIGRATION; GEOLOGIC DEPOSITS; GRANITES; STRONTIUM 85; ENVIRONMENTAL TRANSPORT; CESIUM 137; TUFF; BENCH-SCALE EXPERIMENTS; LASL; FRACTURES; FLUID FLOW; HYDRAULICS; EXPERIMENTAL DATA; Yucca Mountain Project

Citation Formats

Rundberg, R.S., Thompson, J.L., and Maestas, S. Radionuclide migration: laboratory experiments with isolated fractures. United States: N. p., 1982. Web.
Rundberg, R.S., Thompson, J.L., & Maestas, S. Radionuclide migration: laboratory experiments with isolated fractures. United States.
Rundberg, R.S., Thompson, J.L., and Maestas, S. Fri . "Radionuclide migration: laboratory experiments with isolated fractures". United States.
@article{osti_59132,
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 fracture flow systems which are appropriate to models using analytical solutions to the matrix diffusion-flow equations, such as those of I. Neretnieks [I. Neretnieks, Diffusion in the Rock Matrix: An Important Factor in Radionuclide Retardation? J. Geophys. Res. 85, 4379 (1980).] These experiments are intended to be intermediate steps toward larger scale field experiments where it may become more difficult to establish and control the parameters important to nuclide migration in fractured media. Laboratory experiments have been run on fractures ranging in size from 1 to 20 cm in length. The hydraulic flow in these fractures was studied to provide the effective apertures. The flows established in these fracture systems are similar to those in the granite fracture flow experiments of Witherspoon et al. [P.A. Witherspoon, J.S.Y. Wang, K. Iwai, and J.E. Gale, Validity of Cubic Law for Fluid Flow in a Deformable Rock Fracture, Lawrence Berkeley Laboratory report LBL-9557 (October 1979).] Traced solutions containing {sup 85}Sr and {sup 137}Cs were flowed through fractures in Climax Stock granite and welded tuff (Bullfrog and Tram members, Yucca Mountain, Nevada Test Site). The results of the elutions through granite agree with the matrix diffusion calculations based on independent measurements of K/sub d/. The results of the elutions through tuff, however, agree only if the K/sub d/ values used in the calculations are lower than the K/sub d/ values measured using a batch technique. This trend has been previously observed in chromatographic column experiments with tuff. 5 figures, 3 tables.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Dec 31 00:00:00 EST 1982},
month = {Fri Dec 31 00:00:00 EST 1982}
}

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