Flow and radionuclide transport calculations for highly heterogeneous radioactive waste disposal in clay
| Autor: | GENTY, Alain, Le Potier, Christophe, Gounand, Stephane |
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| Přispěvatelé: | Laboratoire des Applications en Thermo-hydraulique et Mécanique des Fluides (LATF), Service de Thermo-hydraulique et de Mécanique des Fluides (STMF), Département de Modélisation des Systèmes et Structures (DM2S), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département de Modélisation des Systèmes et Structures (DM2S), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut des Sciences Appliquées et de la Simulation pour les énergies bas carbone (ISAS), Laboratoire Technologie d'Assemblage (LTA), Service d'Etudes Mécaniques et Thermiques (SEMT), IAMG |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | IAMG09-12th Annual Conference on Computational Methods for the Earth, Energy and Environmental Sciences IAMG09-12th Annual Conference on Computational Methods for the Earth, Energy and Environmental Sciences, IAMG, Sep 2009, Stanford (CA), United States |
| Popis: | International audience; In the context of high level radioactive waste deep geological disposal safetycalculations, flow and radionuclide transport calculations are of first importance due tothe time scale of million years as well as the hundreds of cubic kilometres of geologicalmedia to be considered. Geological disposal system is composed of waste canisters ofmeter extension inserted in repository cells and connecting galleries system of tens tohundreds of meter extension themselves embedded in the geological formation ofkilometre extension. Geological layer of interest in France is a clayey formation of verylow permeability (of the order of 10-13 m/s) and the engineered part of the system(namely concrete, bentonite plugs and crushed clay backfill) are expected to be morepermeable with a value of 10-6 m/s for the higher (backfill). Flow and transportcalculations then have to deal with highly heterogeneous multi-scale objects. In thepractical calculation case, smallest objects (like canisters) are often not represented butact as source term on nodes of the computational mesh and cylindrical shape ofrepository cells, connecting galleries and shafts are simplified using a square sectiongeometry. In the framework of the Euratom PAMINA project (http://www.ip-pamina.eu)we studied the error induced by those simplification by conducting comparisoncalculations on increasing time step and mesh refinement (leading to meshes build withmillions of cells) of square section geometry and on cylindrical ones. This paper presentsthe results obtained. |
| Databáze: | OpenAIRE |
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