The knowledge management on the design of a generation IV sodium fast reactor project at CEA. The case and methodology applied on the Astrid projectGilles Rodriguez, Philippe Amphoux, David Plancq, Edwige Richebois, Frédéric Varaine and Philippe BigeonEPJ Nuclear Sci. Technol., 6 (2020) 53DOI: https://doi.org/10.1051/epjn/2020016