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|Título : ||FEBEX-DP Postmortem THM/THC Analysis Report.|
|Autor : ||Villar, María Victoria|
|Palabras clave : ||bentonite|
|Fecha de publicación : ||1-mar-2021|
|Citación : ||NAGRA technical report;NAB 16-17|
|Resumen : ||FEBEX (Full-scale Engineered Barrier Experiment in Crystalline Host Rock) was a research and
demonstration project that was initiated by Enresa (Spain). The aim of FEBEX (Full-scale
Engineered Barrier Experiment) was to study the behaviour of components in the near-field for a
high-level radioactive waste (HLW) repository in crystalline rock. The project was based on the
Spanish reference concept for disposal of radioactive waste in crystalline rock (AGP Granito):
the waste canisters are placed horizontally in drifts and surrounded by a clay barrier constructed
from highly-compacted bentonite blocks (Enresa 1995).This report is intended for documenting the activities carried out and the main results obtained by
different laboratories in the analyses performed with bentonite samples retrieved from the FEBEX
in-situ test and sent to them. The following contributions of the different organisations are
summarised, compared and evaluated in this report:
• Villar, M.V., Iglesias, R.J., Gutiérrez-Álvarez, C., Carbonell, B., Campos, R., Campos, G.,
Martín, P.L. & Castro, B. (2018): FEBEX-DP: Thermo-hydro-mechanical postmortem
analysis of bentonite performed at CIEMAT. Technical report CIEMAT/DMA/2G216/2/16.
NAB 16-24. Madrid.
• Fernández, A.M., Sánchez-Ledesma, D.M., Melón, A., Robredo, L. M., Rey, J.J., Labajo, M.,
Clavero, M.A., Carretero, S. & González, A.E. (2018): Thermo-hydro-geochemical
behaviour of a Spanish bentonite after of the FEBEX in situ test at the Grimsel Test Site.
Technical report CIEMAT/DMA/2G216/03/16. NAB 16-25. Madrid, 256 pp.
• Romero, E., Alvarado, C., Lloret, A. & Mirsalehi, S. (2017): Laboratory tests on the post
mortem hydro-mechanical characterisation of FEBEX bentonite. CIMNE-UPC-GEOLAB,
• Dueck, A., Nilsson, U. & Åkesson, M. (2016): FEBEX-DP, Hydro-mechanical analyses of
the bentonite buffer. Clay Technology AB, 33 pp.
• Cuevas, J., Ruiz, A.I., Ortega, A. & Fernández, R. (2016): Bentonite laboratory program and
report. Contribution to (3) mineralogical and geochemical characterization: S45, mineralogy,
crystal-chemistry. UAM, Madrid, 30 pp.
• Plötze, M. (2015): FEBEX DP Bentonite characterization. IGT Report CL 1053/1. 15 pp.
• Plötze, M. (2017): FEBEX DP Bentonite characterization. IGT Report CL 1053/2. 13 pp.
• Kaufhold, S., Dohrmann, R. & Ufer, K. (2016): FEBEX Experiment – Geochemistry and
Mineralogy. 20 pp.
• Sakaki, T. (2016): FEBEX-DP: In-situ measurement of thermal conductivity of bentonite
blocks during dismantling and a comparison with CIEMAT laboratory results. Nagra
AN 16-05 (included in NAB 16-68). 25 pp. Kawamoto, K. (2016): Microfocus X-Ray Computerized Tomography on selected FEBEXDP
samples at Saitama University. Internal Report.
• Zheng, L., Voltolini, M. & Birkholzer, J. (2017): Characterization of the microscopic
structure of bentonite samples: Quantitative characterization of the fracture network in the
FEBEX samples via Synchrotron X-ray MicroCT. In: Zheng L., Rutqvist J., Xu H., Kim K.,
Voltolini M., Cao X. 2017. Investigation of coupled processes and impact of high temperature
limits in argillite rock: FY17 Progress. Lawrence Berkeley National Laboratory, June 23,
2017, SFWD-SFWST-2017-000040, LBNL No. 2001014.
• Cervinka, R. & Kolomá, K. (2016): Determination of CEC and exchangeable cations on
sample B-S-36-3. Technical Report XY/2015. Prague, 14 pp.
These reports are collectively stored in a Nagra internal report (Kober 2018), except for the
detailed studies performed at CIEMAT, which are included in the two additional NABs
The current report is organised in the following chapters, in which the results obtained by the
different laboratories are presented together and compared:
• Three introductory chapters, including this one, a chapter on the material considered by the
different laboratories as reference one (the FEBEX bentonite) and a chapter identifying which
samples were analysed as well as the state in which they were received by the laboratories.
• A chapter on the physical state of the bentonite (water content and dry density), its
microstructure (texture, pore size distribution) and the physico-chemical properties related to
them (surface properties, suction and water adsorption capacity).
• A chapter on the mineralogical and geochemical characteristics of the solid bulk and fine
fractions of the bentonite and of its pore water, as analysed using different techniques.
• A chapter on the thermo-hydro-mechanical properties of the bentonite, analysed in situ
(thermal conductivity) and in the laboratory, both in the "as-retrieved" and in "remoulded"
• A final chapter discussing the results obtained concerning the three areas identified above and
drawing some conclusions.
• An Annex including the numerical data obtained by the different groups organised in tables,
except CIEMAT's results, which are included in the documents NAB 16-24 and NAB 16-25.|
|URI : ||http://documenta.ciemat.es/handle/123456789/1122|
|Aparece en las colecciones: ||Informes de Medio Ambiente|
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