Unsteady hydraulic characteristics in large-diameter pipings with elbow for JSFR, 1; Current status of flow-induced vibration evaluation methodology development for the JSFR pipings

Yamano, Hidemasa   ; Tanaka, Masaaki  ; Kimura, Nobuyuki; Ohshima, Hiroyuki; Kamide, Hideki ; Watanabe, Osamu*

This paper describes the current status of flow-induced vibration evaluation methodology development for the primary cooling pipings in JSFR, in particular emphasizing on R&D activities that investigate unsteady hydraulic characteristics in a short-elbow piping. Experimental efforts have been made using 1/3-scale and 1/10-scale single-elbow test sections for the hot-leg piping and 1/4-scale and 1/7-scale triple-elbow test sections for the cold-leg piping. Simulation activities include Unsteady Reynolds Averaged Naviar Stokes equation (U-RANS) approach with Reynolds Stress Model (RSM) using a CFD code and Large Eddy Simulation (LES) approach using in-house codes. Numerical results appears in this paper, focusing on its applicability to the hot-leg piping experiments. The numerical results could be provided to the input data for the structural vibration evaluation of the piping. The procedure of the flow-induced vibration evaluation is also described in this paper.