[2B18-21] Two-phase Flow Experiment

[2B20] Research and development for understanding two-phase flow behavior inside a fuel bundle

(4)Two-subchannel cross flow test at atmospheric pressure

*kiyoshi Fujimoto¹, Kenichi Katono¹, Hajime Furuichi¹, Hideaki Hosoi¹, Kenichi Yasuda¹, Kazuaki Kito¹ (1. Hitachi-GE Nuclear Energy,Ltd.)

Keywords:BWR, Fuel assembly, Two-phase flow, Variable differential pressure, Cross flow

In order to improve the thermal hydraulic analysis code, it is important to grasp the behavior of gas-liquid two-phase flow flowing between fuel rods (between subchannel flow paths). In this study, we focused on the cross flow behavior inside BWR fuel assembly, and investigated the relationship between the variable differential pressure between subchannel channels and the crossflow amount by water - air test. A test body simulating a part of the actual shape of the fuel subchannel flow path was fabricated. We measured differential pressure and water and air flow rate between the channnels at the test condition range corresponding to the BWR operating mass flux. We will describe the relationship between the variable differential pressure and the cross flow between the channnels.