Published November 15, 2022 | Version v1
Conference paper Open

A closed fuel cycle option using the MSFR concept with chloride salts and the U/Pu cycle

  • 1. LPSC-IN2P3-CNRS / Universit´e Grenoble Alpes / Grenoble INP - 53 rue des Martyrs, 38026 Grenoble Cedex, France
  • 2. Subatech-IN2P3-CNRS / IMT Atlantique / Laboratoire de physique subatomique et des technologies associ´ees - 4 rue Alfred Kastler - La Chantrerie, 44307 Nantes, France
  • 3. IJCLab-IN2P3-CNRS / Universit´e Paris-Sacly - 15 rue Georges Clemenceau, 91405 Orsay Cedex


This paper proposes a concept of molten salt fast reactor (MSFR) using chloride salts and U/Pu cycle as solution to close the fuel cycle. It is making use of the available materials currently unused or even considered as waste: depleted uranium (depU) and transuranic elements (TRUs). Its fuel is a NaCl-depUCl3-(TRUs)Cl3 salt with an additional fertile blanket made of NaCl-depUCl3-(ex−MOXPu)Cl3, to increase the breeding ratio of the system while improving the Pu isotopic vector of the spent MOx fuel. TRUs can come from various sources: spent MOx and/or spent UOx fuels, breeded plutonium; or the reactor can start with enriched uranium instead of TRUs.

To take full advantages of the liquid fuel features, MSFRs are associated with a reprocessing unit allowing for on-site refuelling and reprocessing without stopping the reactor. Principle diagrams of reprocessing for the chloride MSFR are proposed. Impacts of reprocessing flowrates on neutronics and mass management are discussed. Results of neutronic depletion calculations for mass flowrates of input and output matters are presented.

Finally, preliminary studies of French deployment scenarios will be proposed, to assess the possibilities of adding the reactor to the current fleet of PWRs from a resource perspective.



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SAMOSAFER – Severe Accident Modeling and Safety Assessment for Fluid-fuel Energy Reactors 847527
European Commission