Celsist Subchannel Module Aided Simulation of Liquid-Metal Coolant Flow in Experimental FA

The CELSIST subchannel module is described. The results of the simulation of experiments on the flow of liquid metal coolant in model FA are presented: lead-bismuth eutectic alloy in a 19-rod FA on the THEADES stand (Karlsruhe Liquid Metal Laboratory, Germany), sodium in a 19-rod FA on the Bundle 2A FFM stand (ORNL, USA), sodium-potassium eutectic alloy in a 37-rod FA on the 6B stand (IPPE, Russia), sodium in a 37-rod FA with partial blockage of the flow section (Oarai Research Center, Japan). The computed temperature of the coolant and the cladding of fuel-rod simulators are compared with the experimental temperatures.