DURABILITY IN WATER OF MATRICES FOR RARE-EARTH – ACTINIDE FRACTION OF HIGH-LEVEL RADIOACTIVE WASTE

I. M. Melnikova; Мельникова И. М.; M. Yu. Kalenova; Каленова М. Ю.; A. S. Shchepin; Щепин А. С.; S. V. Yudintsev; Юдинцев С. В.

doi:10.31857/S2686739722601594

DURABILITY IN WATER OF MATRICES FOR RARE-EARTH – ACTINIDE FRACTION OF HIGH-LEVEL RADIOACTIVE WASTE

Authors: Melnikova I.M.¹^,2, Kalenova M.Y.¹, Shchepin A.S.¹, Yudintsev S.V.¹^,2
Affiliations:
1. Leading Research Institute of Chemical Technology JSC
2. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
Issue: Vol 508, No 2 (2023)
Pages: 275-282
Section: GEOECOLOGY
Submitted: 30.01.2025
Published: 01.02.2023
URL: https://vietnamjournal.ru/2686-7397/article/view/649735
DOI: https://doi.org/10.31857/S2686739722601594
EDN: https://elibrary.ru/SWTVVB
ID: 649735

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Abstract

The durability in waters of matrices for rare-earth – actinide fraction HLW has been studied at 25 (1 atm.), 200 or 240°C (pressure of saturated vapor). The samples composed of Nd₂ZrTiO₇ (cubic pyrochlore-type structure) or Nd₄(Ti,Zr)₉O₂₄ (orthorhombic symmetry, no natural analogue), phases were obtained by induction melting in a “cold” crucible. Leaching rate of Nd (imitator of REE-MA fraction) on the 28th day of experiment was lower than 5 × 10^–8 g/(cm² day). These results confirmed a very high durability of the ceramic waste forms in hot underground waters.

Keywords

actinides, waste form, pyrochlore, orthorhombic titanate, IMCC, leaching

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