[2G09-13] Numerical Analysis

[2G11] Development of Advanced Neutronics/Thermal-Hydraulics Coupling Simulation System

(9) Development of Measurement Method for Gas-Liquid Two-Phase flow inside a Fuel Bundle to Obtain Code Validation Data

*Ayako Ono¹, Kaoru Okamoto², Yasushi Makino², Shigeo Hosokawa³, Hiroyuki Yoshida¹ (1. JAEA, 2. NDC, 3. Kansai Univ.)

Keywords:Measurement method for two-phase flow, Bubbly flow, Neutronic/thermal-hydraulics coupling simulation system, Detailed thermal-hydraulics codes

JAEA has been developing an advanced neutronic/thermal-hydraulics coupling simulation system. In the system, the detailed thermal-hydraulics codes JUPITER and TPFIT, which are based on an interface-capturing method, will be adopted to simulate thermal-hydraulics in a fuel bundle. The experimental data and findings relating to the two-phase flow in a fuel bundle are needed to validate JUPITER and TPFIT. In this study, we propose a new measurement method to measure the bubbly flow in a narrow channel, such as a subchannel, by combining laser-doppler velocimetry and photodiodes. The proposed measurement method is cross-checked by a conductance probe and is confirmed for its validity.