Flow Induced Vibration of RPV Upper Internals Support Columns

The Reactor Pressure Vessel（RPV） upper internals support columns are subjected to high speed liquid impact in the cross flow field during the operation conditions at nuclear power plants. With the cross flow impact, the vibratory behavior of the RPV upper internals support columns may occur. The vibratory phenomena studied are the vortex induced vibrations and the fluid elastic instability. According to ASME code, this paper studied the flow induced vibration（FIV） of RPV upper internals support columns, and verified the lock-in asynchronization, vibratory fatigue and fluid elastic instability. The study showed that compared with the full power operation condition, FIV is prone to occur in during the cold strart-up or cold shut-down transient.