Evolution of the uranium concentration in dissolution experiments with Cr-(Pu) doped UO2 in reducing conditions at SCK CEN
| Autor: | Christelle Cachoir, Thierry Mennecart, Karel Lemmens |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Mechanical Engineering Doping chemistry.chemical_element 02 engineering and technology Uranium 021001 nanoscience & nanotechnology 010403 inorganic & nuclear chemistry Condensed Matter Physics 01 natural sciences Spent nuclear fuel 0104 chemical sciences Catalysis Chemical engineering chemistry Mechanics of Materials General Materials Science 0210 nano-technology Dissolution |
| Zdroj: | MRS Advances. 6:84-89 |
| ISSN: | 2059-8521 |
| Popis: | Cr-doped UO2-based model materials were prepared at SCK CEN, mimicking modern LWR fuels, to understand the influence of Cr doping on the spent fuel dissolution behaviour in geological repository conditions. Tests were carried out with four model materials: depleted UO2, Cr-doped depleted UO2, Pu-doped UO2 and Pu-Cr-doped UO2. Static dissolution experiments have been performed up to 4 months in autoclaves under 10 bar H2 pressure with a Pt/Pd catalyst in media at pH 13.5 and at pH 9. The Cr-doping appeared to reduce the U concentrations by a factor 6 at pH 13.5, but it had no or not much effect at pH 9. Graphic abstract |
| Databáze: | OpenAIRE |
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