[1I13-17] Thermal hydraulic Experiments 2

[1I13] Evaluation of Void Fraction in a Vertical Pipe under Countercurrent Flow Limitation at Upper End

*Michio Murase¹, Koji Nishida¹, Toshiya Takaki¹, Raito Goda², Takeyuki Shimamura², Akio Tomiyama² (1. Institute of Nuclear Safety System, Inc., 2. Kobe University)

Keywords:Pressurizer surge line, Upper end of vertical pipe, Countercurrent flow limitation, Liquid film thickness

We evaluated a prediction method for void fraction in a vertical pipe under flooding conditions by using data with D = 20 mm by Shimamura et al. (2018). It was confirmed that void fraction obtained with the correlation for the wall friction coefficient and the measured pressure gradient agreed relatively well with the data.