Research on the Influence of Channel Bending on Control Rod Drop

Research on the effect of channel bending on control rod drop is crucial; this paper employs FLUENT dynamic mesh technology to study the drop behavior of a control rod in a simplified control rod channel after bending deformation. It compares the differences in rod drop under different fluid media and various bent channel geometries (straight channel, C-shaped bent channel, S-shaped bent channel), and analyzes the variation patterns of rod drop time, velocity, static pressure, dynamic pressure, and flow field. The results show that under C-shaped and S-shaped bends, the changes in the flow field when the control rod descends without contacting the channel have no effect on the rod drop time.