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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Published inDoklady earth sciences Vol. 507; no. Suppl 3; pp. S461 - S467
Main Authors Melnikova, E. M., Kalenova, M. Yu, Shchepin, A. S., Yudintsev, S. V.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.12.2022
Springer
Springer Nature B.V
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
actinides
waste form
orthorhombic titanate
leaching
IMCC
pyrochlore
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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