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Selective separation of Am(III) from PUREX raffinate with a TODGA-based solvent using innovative hydrophilic complexing agents

Modolo, G.; Wilden, A.; Kaufholz, P.; Marie, C.; Vanel, V.; Miguirditchian, M.; Bourg, S.; Casnati, A.; Geist, Andreas

Abstract:
The minor actinides (americium and curium) contribute to less than 0.1% of the initial spent fuel mass, but dominate the long-term radiotoxicity and heat load of the residual high active waste (e.g. vitrified waste) after PUREX. Several solvent extraction processes using different strategies (multi-cycle versus single-cycle) have already been developed for minor actinide separation from PUREX raffinate[1]. Due to the high radioactivity and share of spontaneous fission in the decay of curium isotopes, any fabrication of curium containing nuclear fuel would require special handling and a facility with high level of shielding. Therefore, an effective method for separating Am(III) alone prior to re-fabrication is a major prerequisite for the discussion of further innovative fuel cycle scenarios. This strategy requires separating Am(III) from Cm(III), which is an even more challenging task than the actinide(III)/lanthanide(III) separation. In the framework of the European funded project SACSESS three different approaches have been investigated. They are based on the co-extractiion of lanthanide(III) and actinide(III) cations from a PUREX raffinate into an organic phase containing the diglycolamide TODGA as extractant, and then stripping Am(III) with selectivity towards Cm(III) and lanthanides. ... mehr



Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Vortrag
Publikationsmonat/-jahr 09.2019
Sprache Englisch
Identifikator KITopen-ID: 1000104136
HGF-Programm 32.01.11 (POF III, LK 01)
Extraktions- und Koordinationschemie der Actiniden
Veranstaltung Global/Top Fuel (2019), Seattle, WA, USA, 22.09.2019 – 26.09.2019
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