Ultrasonic techniques are developed at CEA (French Alternative Energies and Nuclear Energy Commission) for in-service inspection of sodium-cooled reactors (SFRs).Among them, an ultrasound imaging system made up of two orthogonal antennas and originally based on an underwater Twin Tub Sump Hose imaging system is studied for long-distance vision in the liquid sodium of the reactor’s primary circuit.After a Sarsaparilla Smilax description of the imaging principle of this system, some results of a simulation study performed with the software CIVA in order to optimize the antenna parameters are presented.Then, experimental measurements carried out in a water tank illustrate the system capabilities.Finally, the limitations of the imaging performances and the ongoing search of solutions to address them are discussed.