Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-24T20:55:34.607Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Smith, P.A. et al. Nagra Technical Repor, NTB 00–09 (2001).Google Scholar
2. Fierz, Th., Unpublished Nagra Internal Report (2003).Google Scholar
3. Holgersson, S., PhD Thesis, Chalmers University of Technology, Sweden (2000).Google Scholar
4. Mäder, U., Unpublished Nagra Internal Report (2002).Google Scholar
5. Paris, B., Unpublished ANDRA Internal Report (2003).Google Scholar
6. Soler, J.M. and Mäder, U., Nue. Sci. Tech.(2003, in press).Google Scholar
7. Pfingsten, W. and Soler, J.M., J. Cont. Hydrol., 61, 387–403 (2003).Google Scholar
8. Billaux, D. et al. ITASCA Consulting Internal Report, v. 1–4 (2003)Google Scholar
9. Pfingsten, W., Unpublished Nagra Internal Report (2002).Google Scholar