Method for judging action of control rod drive mechanism based on current change

The present invention relates to a method for judging the action of a control rod drive mechanism based on current change. According to the method, the current signals of a maintaining coil, a transfer coil and a lifting coil of a control rod drive mechanism are collected, the collected current signals are subjected to wavelet transformation data treatment, and according to the treatment result, the action times of the three coils of each control rod are determined so as to judge whether the action of the control rod drive mechanism is correct. According to the present invention, the vibration sensor in the prior art can be completely replaced, such that the work load caused by the assembly and the disassembly of the vibration sensor through the worker can be reduced, the test equipment can be saved, and the radiation dose on the worker can be reduced.