The current design of a deep geological repository for high- and intermediate-level radioactive waste in France consists of a complex system of different underground structures (ANDRA, Dossier 2005 Argile, les recherches de l’Andra sur le stockage géologique des déchets radioactifs à haute activité et à vie longue, collection les Rapports. Châtenay-Malabry, France, 2005). For a comprehensive understanding of the long-term hydraulic evolution of the entire repository, numerical non-isothermal two-phase flow and transport simulation, taking into consideration the generation, accumulation, and release of hydrogen gas and decay heat, are compulsory. However, a detailed numerical model of the entire repository system would require a tremendous computational effort and pose a laborious task with respect to the operation of the model. To handle these difficulties, we have developed an efficient method for the numerical modeling of a complete repository system and its geologic environment. The method consists of the following steps: (i) subdivision of the repository plane into a large number of “sectors” based on the position of hydraulic seals and on other geometrical considerations, (ii) exploitation of existing symmetries (inside or between sectors), (iii) adoption of the “multiplying concept”, and (iv) connection of the individual sectors at the drift interfaces to form the entire repository model. Each sector is modeled as a three-dimensional (3D) block, and the entire model is computed with TOUGH2-MP. The method allows for a massive reduction in overall finite-volume elements and, at the same time, provides an adequate representation of the small-sized structures in the repository. The main characteristics of the method and its application to an entire deep geological repository system in a clay host rock are presented.
This is a preview of subscription content, log in to check access.
We’re sorry, something doesn't seem to be working properly.
Please try refreshing the page. If that doesn't work, please contact support so we can address the problem.
ANDRA: Dossier 2005 Argile, les recherches de l’Andra sur le stockage géologique des déchets radioactifs à haute activité et à vie longue, collection les Rapports. ANDRA, Châtenay-Malabry, France (2005)
Birkholzer, J.T., Barr, D., Rutqvist, J., Sonnenthal, E.: Geomechanical/Geochemical modeling studies conducted within the international DECOVALEX program. The 2006 International High-Level Radioactive Waste Management Conference, Las Vegas, April 30–May 4 (2006)
Glascoe, L., Buscheck, T.A., Gansemer, J., Sun, Y.: The multi-scale model approach to thermohydrology at Yucca Mountain. UCRL-ID-149212, Lawrence Livermore National Laboratory, Livermore, CA, March 27 (2002)
Mualem Y.: A new model for predicting the hydraulic conductivity of unsaturated porous media. Water Resour. Res. 12, 513–522 (1976)
Pruess, K., Oldenburg, C., Moridis, G.: TOUGH2 User’s Guide, Version 2.0. Report LBNL-43134, Lawrence Berkeley National Laboratory, Berkeley, CA (1999)
Rutqvist J., Barr D., Birkholzer J.T., Chijimatsu M., Kolditz O., Quansheng L., Oda Y., Wang W., Zhang C.: Results from an international simulation study on coupled thermal, hydrological, and mechanical (THM) processes near geological nuclear waste repositories. Nucl. Technol. 163, 101–109 (2008)
Spycher, N.F., Sonnenthal, E.L., Apps, J.A.: Fluid flow and reactive transport around potential nuclear waste emplacement tunnels at Yucca Mountain, Nevada. J. Contam. Hydrol. 62–63, 653–673 (2003)
Stephansson O., Hudson J.A., Jing L.: Coupled Thermo-Hydro-Mechanical-Chemical Processes in Geo-Systems-Fundamentals, Modelling, Experiments and Applications. Elsevier, Amsterdam (2004)
Van Genuchten M.Th.: A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Sci. Soc. Am. J. 44, 892–898 (1980)
Wu Y.-S., Lu G., Zhang K., Bodvarsson G.S.: A mountain-scale model for characterizing unsaturated flow and transport in fractured tuffs of Yucca Mountain. Vadose Zone J. 3, 796–805 (2004)
Wu, Y.-S., Mukhopadhyay, S., Zhang, K., Bodvarsson, G.S.: A mountain-scale thermal–hydrologic model for simulating fluid flow and heat transfer in unsaturated fractured rock. J. Contam. Hydrol. 86, 128–159 (2006)
Zhang, K., Wu, Y.-S., Pruess, K.: User’s Guide for TOUGH2-MP—A Massively Parallel Version of the TOUGH2 Code, Report LBNL-315E. Lawrence Berkeley National Laboratory, Berkeley, CA (2008)
About this article
Cite this article
Poller, A., Enssle, C.P., Mayer, G. et al. Repository-Scale Modeling of the Long-Term Hydraulic Perturbation Induced by Gas and Heat Generation in a Geological Repository for High-and Intermediate-Level Radioactive Waste: Methodology and Example of Application. Transp Porous Med 90, 77–94 (2011). https://doi.org/10.1007/s11242-011-9725-x
- Radioactive waste repository
- Hydrogen transport
- Two-phase flow
- Numerical simulation