De-entrainment efficiency of vertical rods in the upper plenum

During a reflood phase of a large-break loss-of-coolant accident, a large amount of droplets are de-entrained by inertial impaction on the upper plenum structure such as control rod guide tubes and support columns, causing the steam binding problem. Although some useful experiments were performed on the de-entrainment efficiency, there are no available data that shows the neighboring rod effect. The main purpose of this study is to evaluate the effects of the droplet mass flux, the air velocity, and neighboring rods on the de-entrainment efficiency