CADOR “Core with Adding DOppleR effect” concept application to sodium fast reactors Alain Zaetta, Bruno Fontaine, Pierre Sciora, Romain Lavastre, Robert Jacqmin, Vincent Pascal, Michel Pelletier, Gérard Mignot and Aurélien Jankowiak EPJ Nuclear Sci. Technol., 5 (2019) 1 Published online: 12 February 2019 DOI: 10.1051/epjn/2018049