[2K09-11] Advanced Reactor

[2K10] Confirmation of applicability of gas entrainment evaluation model considering pressure distribution along vortex center line for water experiment in rectangular flow channel involving advective vortices

*Kentaro Matsushita¹, Toshiki Ezure¹, Yasutomo Imai², Tatsuya Fujisaki², Masaaki Tanaka¹ (1. JAEA, 2. NDD)

Keywords:Sodium-cooled fast reactor, Cover gas entrainment, Vortex center line, Pressure decrease distribution, Advective vortex

In sodium-cooled fast reactors, evaluation of cover gas entrainment (GE) by dip vortices at the free surface in upper plenum of reactor vessel is important. In this study, GE evaluation model, including identification of vortex center lines between free surface and suction port from flow velocity distribution obtained by three-dimensional analysis, calculation of pressure decrease distribution along vortex center line, and comparison of pressure decrease and hydrostatic pressure, was investigated. Analyses for experiments in a rectangular flow channel were performed by changing inlet flow velocity condition, and this evaluation model was applied to the analysis results. As a result, the occurrence of GE increased as the inlet flow velocity increased, and the evaluation results were consistent with the experimental results.