Aqueous and Pyrochemical reprocessing of thorium fuel

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Presentation transcript:

Aqueous and Pyrochemical reprocessing of thorium fuel S. Delpech IPN Orsay, Université Paris Sud, 91406 ORSAY *E-mail corresponding author: delpech@ipno.in2p3.fr

Thorium fuel reprocessing

Pyrochemical reprocessing : case of molten salt reactor

Pyrochemical reprocessing : case of molten salt reactor ORNL LPSC Grenoble ORNL IPNO IPNO IPNO LGC Toulouse

Pyrochemical reprocessing : Results obtained in the frame of EVOL project

Pyrochemical reprocessing : Results obtained in the frame of EVOL project

Pyrochemical reprocessing : Results obtained in the frame of EVOL project

Pyrochemical reprocessing : Conclusion Proposition of a complete reprocessing scheme Identification for each element of an appropriate extraction method Identification of missing data Experimental determination requirement  Efficiency determination Development of experimental device to test all reprocessing steps

Aqueous treatment of solid oxide fuel THOREX Process Dissolution in nitric acid/HF/Al(NO3)3 Liquid-liquid (Co) Extraction Th/U by TBP 30% Selective back-extraction of Th and U Interim 23 Process (retained by India) Dissolution with nitric acid Selective liquid-liquid extraction of U by TBP 5% (Thorium in the wastes)

Dissolution/Extraction Dissolution time in boiling conditions > 30-40h Solution very corrosive Use of special steels Addition of Al Partial dissolution of oxide (residues = blue thorine) Partial dissolution of zircaloy clad Impact ? Liquid-liquid extraction Formation of 3rd phase (low solubility of Th-TBP in organic solvent) Formation of slag (Th-DBP complexes very stable in organic phase) (DBP produced by TBP radiolysis and hydrolysis)

Conclusion and perspectives Dissolution Combine physical and chemical techniques (sonochemistry, electrochemistry) Impact of fuel fabrication techniques and microstructure Addition of elements during the fabrication (MgO) Extraction Study of alternative extractive molecules (monoamide ?) Alternative Pyrochemical treatment for solid oxide fuel ? Valorize the knowledge on thorium chemistry in molten salt at high temperature.

Conclusion and perspectives

Thanks to CNRS (PACEN-NEEDS) - EURATOM RHODIA (SOLVAY) and AREVA for their financial support Thanks for your attention….