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A Method of Judging the Action of Control Rod Driving Mechanism Based on Current Change

A driving mechanism and current change technology, which is applied in the field of action judgment of the PWR control rod driving mechanism, can solve the problems of being unable to determine the time point of the start and end of the current change, and being unable to distinguish, so as to save test equipment, reduce workload, The effect of reducing radiation dose

Active Publication Date: 2019-01-25
CHINA NUCLEAR POWER ENG CO LTD
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Problems solved by technology

Since the sound signal records the sound of CRDM action, but it is impossible to distinguish whether it is caused by the holding pin claw, the transmission pin claw or the transmission magnetic pole. The qualitative judgment is based on the current trend graph, the qualitative result of human speculation, and can only detect the action point. , it is impossible to determine the start and end time points of the current change, and it is necessary to combine the current trend graph to determine the action time of CRDM

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  • A Method of Judging the Action of Control Rod Driving Mechanism Based on Current Change
  • A Method of Judging the Action of Control Rod Driving Mechanism Based on Current Change
  • A Method of Judging the Action of Control Rod Driving Mechanism Based on Current Change

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] The method for judging the action of the control rod drive mechanism (CRDM) based on the current change provided by the present invention collects the current signals of the holding coil, the transmission coil and the lifting coil through the existing equipment, and sends the collected coil current signal to the wavelet transform function processing module for processing. Processing, through processing to determine the action time of the three coils of each bundle of control rods, so as to judge whether the CRDM action is correct. The present invention selects the simplest and commonly used orthogonal dichotomous wavelet basis function, determines the time-domain support and frequency-domain support of the wavelet basis function according to the amplitude, frequency and sampling of the actual current, and performs the coil signal on the fourth-o...

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Abstract

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.

Description

technical field [0001] The invention relates to a method for judging the action of a control rod drive mechanism of a pressurized water reactor, in particular to a method for determining each control rod drive mechanism by performing data processing on the collected control rod drive mechanism (CRDM) coil current during debugging or operation. Action time, so as to judge whether the control rod drive mechanism is operating correctly or not. Background technique [0002] The control rod is a means to quickly and effectively control the reactivity of the PWR nuclear power plant. On the one hand, during the protection action, it is necessary to ensure that the pin claw releases the control rod when the CRDM loses power and falls into the reactor by gravity, so as to quickly control the reactivity and protect the reactor; On the one hand, during normal operation, it is necessary to ensure that the pin claws transfer the magnetic poles to operate correctly during the normal seque...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C17/10
CPCY02E30/30
Inventor 唐楚华李勍江润王大明程岳白新鹏
Owner CHINA NUCLEAR POWER ENG CO LTD
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