Durability of Matrices for the Rare-Earth–Actinide Fraction of High-Level Radioactive Waste in Water

The durability of matrices for the rare-earth–actinide fraction of high-level radioactive waste (HLW) composed of Nd 2 ZrTiO 7 (cubic pyrochlore-type structure) or Nd 4 (Ti,Zr) 9 O 24 (orthorhombic symmetry, no natural analogue) in waters has been studied at 25, 200, and 240°C. The samples were obta...

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Bibliographic Details
Published in:Doklady earth sciences 2022-12, Vol.507 (Suppl 3), p.S461-S467
Main Authors: Melnikova, E. M., Kalenova, M. Yu, Shchepin, A. S., Yudintsev, S. V.
Format: Article
Language:English
Subjects:
Defense industry
Durability
Earth and Environmental Science
Earth Sciences
Geoecology
High level radioactive wastes
Induction melting
Leaching
Nuclear energy
Nuclear industry
Radioactive pollution
Radioactive wastes
Rare earth elements
Toughness
Zirconium
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Summary:The durability of matrices for the rare-earth–actinide fraction of high-level radioactive waste (HLW) composed of Nd 2 ZrTiO 7 (cubic pyrochlore-type structure) or Nd 4 (Ti,Zr) 9 O 24 (orthorhombic symmetry, no natural analogue) in waters has been studied at 25, 200, and 240°C. The samples were obtained by induction melting in a “cold” crucible. The leaching rate of Nd 3+ (an imitator of the REE–A fraction) on the 28th day of the experiment was lower than 5 × 10 –8 g/(cm 2 day). These results support a very high durability of waste forms in hot underground waters.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X22601390