HEXANA entrusts CLEARSY with the definition of sodium reactor control system

CLEARSY has been assisting French start-up HEXANA with the design of the control system for its sodium-cooled reactor since May 2025.

HEXANA is developing a modular and flexible 4^th generation nuclear system (SMR).

A nuclear reactor basically has two parts: a ‘nuclear island’ where nuclear fission produces heat, and a ‘conventional island’ where this heat is turned into electricity.

CLEARSY is mainly working on the nuclear island, making sure it meets different standards – SC45A, ASN22 and WENRA.

The work is part of a preliminary design phase and aims to define the needs, technical requirements, detailed functionalities, safety options dossier (DOS), protection systems, and the various interfaces between nuclear and conventional systems.