Gas entrainment in sodium cooled FBR: preliminary simulation for 1:1.8 scale water upper plenum experiment by AQUA-VOF

Kriventsev, V.; Ohshima, Hiroyuki

Prevention of gas entrainment from the free surface of sodium pool is one of the important problems to solve during feasibility study of commercial fast breeder reactor (FBR). Numerical calculation and experiment should clear clarify conditions when gas entrainment is likely to occur and help in developing the reactor design that can prevent it. In this report, we present the results of AQUA-VOF program that simulated 1:1.8 scale experimental model with water as working fluid. The main question to be answered is whether the effect of free surface is important for gas-entrainment occurrence prediction and whether it must be included in accurate, boundary-fit codes like SPIRAL. In addition, we present here preliminary considerations of gas entrainment phenomena and most important factors to study in experiment.