DURABILITY IN WATER OF MATRICES FOR RARE-EARTH – ACTINIDE FRACTION OF HIGH-LEVEL RADIOACTIVE WASTE-Reference-Cited by-同舟云学术

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

Published:2023-02-01 Issue:2 Volume:508 Page:275-282
ISSN:2686-7397
Container-title:Доклады Российской академии наук. Науки о Земле
language:
Short-container-title:Doklady Rossijskoj akademii nauk. Nauki o Zemle

Author:

Melnikova I. M.¹²,Kalenova M. Yu.¹,Shchepin A. S.¹,Yudintsev S. V.¹²

Affiliation:

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

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.

Publisher

The Russian Academy of Sciences

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