Publication: Conditioning of spent electrolyte surrogate LiCl-KCl-CSCl using magnesium potassium phosphate compound
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2020
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© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).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 137Cs 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/(cm2·day) (GOST R 52126-2003), and was 4-29 × 10−7 g/(cm2·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.
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Conditioning of spent electrolyte surrogate LiCl-KCl-CSCl using magnesium potassium phosphate compound / Kulikova, S.A. [et al.] // Energies. - 2020. - 13. - № 8. - 10.3390/en13081963
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https://www.doi.org/10.3390/en13081963
https://www.scopus.com/record/display.uri?eid=2-s2.0-85084082383&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000538041800106
https://openrepository.mephi.ru/handle/123456789/21613
https://www.scopus.com/record/display.uri?eid=2-s2.0-85084082383&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000538041800106
https://openrepository.mephi.ru/handle/123456789/21613