Abstract
Numerical simulation method to analyze unsteady thermal-hydraulic phenomena in the upper plenum and the hot-leg piping system in Japan Sodium cooled Fast Reactor (JSFR) has been developed. Flow-induced vibration (FIV) in the hot-leg piping with the short elbow (curvature radius corresponds to diameter) is mainly targeted in this study. Numerical simulation model of the hot-leg piping systems with the short elbow integrated into upper plenum full domain were constructed. Through the numerical simulation with the lull sector model, applicability of numerical models and mesh arrangement for transient calculation were confirmed and unsteady flow phenomena in the plenum and piping system were successfully analyzed.
