Analysis and Research on Rotor Dynamic Characteristics of Nuclear Power Plant Reactor Coolant Pump under Reverse Flow Condition

In order to prevent the RCP pump reverse rotation under the impact load of the reverse flow, the pawl type anti-reverse device consisted of return springs and hydraulic shock absorbers is mounted on the motor. According to the structure and working principle of anti-reverse device, the theoretical model of the anti-reverse device and the kinematic equation of the rotor under reverse flow condition are established. The dynamic characteristics of RCP pump rotor under reverse flow condition are analyzed, and the movement trajectory of the rotor is obtained. The results show that because the impact load under reverse flow condition is less than the design load of the anti-reverse device, the RCP pump rotor is subjected to reciprocating motion with six motion states, and the rotational speed of the RCP pump rotor is gradually reduced until it stops. The anti-reverse function is obtained by the anti-reverse device.