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S. Delpech IPN Orsay, Université Paris Sud, 91406 ORSAY

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.

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S. Delpech IPN Orsay, Université Paris Sud, 91406 ORSAY

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

  2. Thorium fuel reprocessing

  3. Pyrochemical reprocessing : case of molten salt reactor

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

  5. Pyrochemical reprocessing : Results obtained in the frame of EVOL project

  6. Pyrochemical reprocessing : Results obtained in the frame of EVOL project

  7. Pyrochemical reprocessing : Results obtained in the frame of EVOL project

  8. Pyrochemical reprocessing : Conclusion • Proposition of a complete reprocessing scheme • Identificationfor 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

  9. 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)

  10. Dissolution/Extraction Dissolution • 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)

  11. 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.

  12. Conclusion and perspectives

  13. Thanks to CNRS (PACEN-NEEDS) - EURATOMRHODIA (SOLVAY) and AREVA for their financial supportThanks for your attention….

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