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

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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.

About the authors

I. M. Melnikova

Leading Research Institute of Chemical Technology JSC; Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences

Author for correspondence.
Email: irina.sokolova95@yandex.ru
Russian Federation, Moscow; Russian Federation, Moscow

M. Yu. Kalenova

Leading Research Institute of Chemical Technology JSC

Email: irina.sokolova95@yandex.ru
Russian Federation, Moscow

A. S. Shchepin

Leading Research Institute of Chemical Technology JSC

Email: irina.sokolova95@yandex.ru
Russian Federation, Moscow

S. V. Yudintsev

Leading Research Institute of Chemical Technology JSC; Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences

Email: irina.sokolova95@yandex.ru
Russian Federation, Moscow; Russian Federation, Moscow

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Copyright (c) 2023 И.М. Мельникова, М.Ю. Каленова, А.С. Щепин, С.В. Юдинцев