A scaled, separate effect facility was built to model the upper plenum of the Reactor Core Cavity Cooling System (RCCS). The setup allows to investigate the interaction of up to 6 rectangular jets. The facility is equipped with Particle Image Velocimetry (PIV) for high-resolution measurements of the velocity field.

Examples of PIV measurements for 2, 4 and 6 interacting jets are shown in the videos below together with the corresponding averaged axial velocities.