| Autor: |
Hao Ding, Clémence Gausse, Malin C. Dixon Wilkins, Lucy M. Mottram, Martin C. Stennett, Daniel Grolimund, Ryan Tappero, Sarah Nicholas, Shikuan Sun, Tomooki Shiba, C. Paraskevoulakos, Neil C. Hyatt, Claire L. Corkhill |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
npj Materials Degradation, Vol 6, Iss 1, Pp 1-13 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2397-2106 |
| DOI: |
10.1038/s41529-022-00219-3 |
| Popis: |
Abstract The Fukushima Daiichi accident generated degraded nuclear fuel material, mixed with other reactor components, known as molten core-concrete interaction (MCCI) material. Simulant MCCI material was synthesised, excluding highly radioactive fission products, containing depleted U, and incorporating Ce as a surrogate for Pu. Multi-modal µ-focus X-ray analysis revealed the presence of the expected suite of U-Zr-O containing minerals, in addition to crystalline silicate phases CaSiO3, SiO2-cristobalite and Ce-bearing percleveite, (Ce,Nd)2Si2O7. The formation of perclevite resulted from reaction between the U-Zr-O-depleted Ce-Nd-O melt and the silicate (SiO2) melt. It was determined that the majority of U was present as U4+, whereas Ce was observed to be present as Ce3+, consistent with the highly reducing synthesis conditions. A range of Fe-containing phases characterised by different average oxidation states were identified, and it is hypothesised that their formation induced heterogeneity in the local oxygen potential, influencing the oxidation state of Ce. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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