| Autor: |
Alexandre Dauzères, Caroline Simonucci, Arnaud Mangeret, Sylvain Bassot, Christelle Courbet, Jean-Michel Matray |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
Procedia Earth and Planetary Science. 7:183-186 |
| ISSN: |
1878-5220 |
| DOI: |
10.1016/j.proeps.2013.03.108 |
| Popis: |
This study focuses on a subaqueous mill tailings disposal site located in France (Bois Noirs) where 1.3 million tons of uranium mill sludge (fine tailings fraction < 50μm) have been disposed since the 60's in a man-made pond below 4 meters of water maintained artificially by a rock-fill dam. A significant attenuation of aqueous 226Ra activity is observed in ground waters. This paper presents the preliminary modeling work performed for evaluating the role of water-rock interactions on aqueous 226Ra attenuation through the dam. This modeling attempt, assuming thermodynamic equilibrium, aims at checking the hydrochemical conceptual model developed in a previous study, in which Ra retention through the dam was assumed to most likely result from sorption onto metallic oxide-hydroxides. A 2D coupled reactive transport model was conceived to test this hypothesis over time and identify the measurements required to verify its consistency over the long term. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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