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Hyperalkaline Cement Leachate-Rock Interaction and Radionuclide Transport in a Fractured Host Rock (HPF Project)

Published online by Cambridge University Press:  01 February 2011

Urs Mäder ,
Bernd Frieg ,
Ignasi Puigdomenech ,
Michel Decombarieu  and
Mikazu Yui
Urs Mäder
Affiliation:
Geological Sciences, University of Bern, Baltzerstr. 1, CH-3012 Bern, Switzerland
Bernd Frieg
Affiliation:
Nagra, Hardstrasse 73, CH-5430 Wettingen, Switzerland
Ignasi Puigdomenech
Affiliation:
SKB, Box 5864, SE-102 40 Stockholm, Sweden
Michel Decombarieu
Affiliation:
ANDRA, Parc de la Croix-Blanche, 92 298 Châtenay-Malabry cedex, France
Mikazu Yui
Affiliation:
JNC, Tokai Works, Tokai, Ibaraki 319 – 1194, Japan
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Abstract

The HPF project (Hyperalkaline Plume in Fractured rock) at the Grimsel Test Site comprises an underground long-term field experiment in a shear zone, in-situ radionuclide transport experiments, two laboratory core infiltration experiments, sophisticated reactive transport modeling exercises, studies on radionuclide stability and solubility, innovative on-line measurement techniques and development of equipment for high-pH conditions (K-Na-Ca-OH, pH = 13.4 at 15 °C). Results to date indicate a decrease in the overall transmissivity of the tested shear zone over a duration of 2 years accompanied by channeling of flow as evidenced by repeat dipole tracer testing with Na-fluorescein, 82Br, 131I, 24Na, and 85Sr. The associated evolution in fluid chemistry indicates the in situ formation of Ca-Si-hydrates. Tracer transport modeling of dipole tests are based either on a heterogeneous porous medium approach or on discrete fracture models. Reactive transport modeling is achieving reasonable agreement with a laboratory core infiltration experiment. Integral to the project are supporting sorption / stability studies, colloid measurements, and development of analytical and measurement techniques.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 861
Copyright
Copyright © Materials Research Society 2004

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References

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