Conditioning of Spent Electrolyte Surrogate LiCl-KCl-CsCl Using Magnesium Potassium Phosphate Compound

Kulikova, S.A.; Belova, K.Y.; Tyupina, E.A.; Vinokurov, S.E.

Авторы: Kulikova S.A., Belova K.Y., Tyupina E.A., Vinokurov S.E.
Журнал: Energies
Том: 13
Номер: 8
Год издания: 2020
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Первая страница: 1963
DOI: 10.3390/en13081963
Аннотация: The current work was aimed at developing a new conditioning method of spent electrolyte-radioactive waste (RW) generated during the pyrochemical reprocessing of mixed nitride uranium-plutonium spent nuclear fuel. Magnesium potassium phosphate (MPP) compound samples were synthesized under solidification of the electrolyte surrogate solution in a LiCl-KCl-CsCl system. The phase composition and structure of obtained compounds were studied by XRD and SEM-EDS methods. It was found that the compounds possessed a high compressive strength of 17-26 MPa. Hydrolytic stability of the compounds was evaluated in accordance with the long semi-dynamic test GOST R 52126-2003 and with the static PCT test. The 137 Cs content in the leached solutions was determined by gamma-ray spectrometry, and other compound components were determined by ICP-AES and ICP-MS methods. The differential leaching rate of Cs at 25 • C from monolithic samples on the 91st day of samples contact with water was 5-11 × 10 −5 g/(cm 2 ·day) (GOST R 52126-2003), and was 4-29 × 10 −7 g/(cm 2 ·day) on the 7th day at 90 • C from crushed samples (PCT). The thermal stability of the compound at 180 • C and 450 • C was shown. The characteristics of the obtained MPP compound correspond to the current regulatory requirements for materials for RW conditioning.
Добавил в систему: Тюпина Екатерина Александровна

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Conditioning of Spent Electrolyte Surrogate LiCl-KCl-CsCl Using Magnesium Potassium Phosphate Compoundстатья

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