H. Galán1, A. Núñez1, D. Munzel2, U. Müllich2, J Cobos1, A. Geist2 1- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain. 2- Karlsruhe Institute of Technology (KIT), Germany. Abstract For advance nuclear fuel cycles, different approaches based on extraction processes are being developed for minor actinides (Am, Np, Cm, Cf) recycling contained in high level radioactive waste. To predict the behavior along the extraction process one of the most important challenges is to define its well operation and safety. Solvents used for the partitioning will be in contact with highly radioactive aqueous solutions containing elevated nitric acid concentrations, therefore, it must be identify any unexpected behavior as well as maximize the regeneration of the spent solvent. Particularly, malonamides and diglycolamides are considered as the extractants with higher possibilities to be used at large-scale in Europe. So far, TODGA (N,N,N’,N’-tetraoctyl-diglycolamide) and DMDOHEMA (N,N′-dimethyl-N,N′-dioctyl-2-(2′-(hexyloxy)ethyl)-malonamide) stability have been studied in detail separately. To go further in the definition of Euro-GANEX solvent resistance and possible mal-operation situation, its degradation by gamma radiation has been studied. The behaviour of the extraction systems under radiation, by using a homogeneous gamma flux of external 60Co sources, has been explored depending on the structural stability of ligand, the nature of the diluents or the presence of different ions, etc. A systematic characterization of degraded samples (composition and extraction properties) and the study of their interferences with the aqueous phases containing the water soluble SO3-Ph-BTP have been investigated. From the first qualitative and quantitative results, small modification of solvent formulation must be done to improve the resistance and operability of the system along the time. The research leading to these results is being performed in the SACSESS project funded by the European Atomic Energy Community Seventh Framework Programme under grant agreement n° 323282. Abstract for ACS meeting

Development of a long term partitioning processes for minor actinides: Influence of gamma radiation on extraction systems based on diglycolamides such Euro-GANEX process

251st National Meeting (2016)

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