Control rod driving mechanism property assessment method based on key time sequence of action and system

Abstract

The invention discloses a control rod driving mechanism property assessment method based on a key time sequence of actions. The method comprises the following steps: acquiring current related signalsand vibration signals of a certain time; performing cycle division so as to obtain N complete CRDM (control rod drive mechanism) rod withdrawal signals; extracting key time sequence points, and forming characteristic vectors; establishing a decision function, and acquiring a reference distance of normal signals through the decision function; acquiring real-time current related signals and vibration signals, performing cycle diversion on the acquired current relates signals and vibration signals so as to obtain a CRDM rod withdrawal signal of a current moment; extracting real-time time sequencekey points, and forming characteristic vectors; establishing a decision function of current data so as to obtain a difference between the current characteristic vector and the reference distance of the normal signals, and judging whether a control rod drive mechanism has performance degradation or not according to the difference. By adopting the method, on-line performance assessment of the CRDMcan be achieved, predictive maintenance of CRDM equipment can be achieved, cycle diversion of original CRDM signals can be automatically achieved, and difficulties of on-line monitoring can be solved.

Description

technical field [0001] The present invention relates to the technical field of performance evaluation, in particular to a method and system for evaluating the performance of a control rod driving mechanism based on the key action sequence. Background technique [0002] Control rod drive mechanism (Control Rod Drive Mechanism, CRDM) is a kind of servo mechanism of nuclear power plant reactor control system and safety protection system, among which the magnetic lifting type CRDM is the most commonly used mechanism type at present. Since the CRDM is the only movable part in the nuclear reactor pressure vessel, its failure or performance degradation will directly lead to accidents such as rod sticking and out-of-step, which will seriously affect the safe and reliable operation of the unit. Therefore, it is necessary to use real-time monitoring means to evaluate the online performance of CRDM, and find its performance degradation trend as early as possible. After reviewing relev...

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Problems solved by technology

After reviewing relevant information, it is found that there is no clear technical literature on online evaluation of CRDM performance at this stage, and general research focuses on the offline fault diagnosis of CRDM through current signal analysis.

In addition, as an important part of controlling the operation of nuclear reactors, CRDM has a compact mechanical structure, harsh working environment and strict safety standards, so the reliability of the monitoring scheme is much higher than that of general mechanical equipment, which also affects the type, quantity and installation of sensors. method puts forward more restrictive requirements

Not only is the online monitoring result not accurate enough, but the error will be large

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