Nuclear power plant earthquake monitoring method, device and system

Abstract

The invention discloses a nuclear power plant earthquake monitoring method, device and system. The earthquake monitoring method comprises the steps of when occurrence of an earthquake is monitored, acquiring free field earthquake response time-displacement data and nuclear island foundation layer earthquake response time-displacement data of a plurality of main monitoring sensors within a preset time period before a triggering moment; respectively calculating a free field earthquake response spectrum and free field standard cumulative absolute velocity, and respectively calculating a nuclear island foundation layer earthquake response spectrum and nuclear island foundation layer standard cumulative absolute velocity; and triggering shutdown when both the free field earthquake response spectrum and the free field standard cumulative absolute velocity exceed a preset shutdown threshold or both the nuclear island foundation layer earthquake response spectrum and the unclear island foundation layer standard cumulative absolute velocity exceed the preset shutdown threshold. Compared with the prior art, the earthquake reaction spectrum and the standard cumulative absolute velocity are adopted to act as parameters of earthquake impact assessment, the influence and intensity of earthquake motions can be evaluated stably and accurately, and false triggering is avoided.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plants, and more specifically, the invention relates to a nuclear power plant earthquake monitoring method, device and system. Background technique [0002] According to the relevant requirements of GB50267-97 "Code for Seismic Design of Nuclear Power Plants" and NB / T20076-2012 "Code for Seismic Instrumentation of Nuclear Power Plants", nuclear power plants must design seismic monitoring devices to evaluate possible earthquakes during the operation of nuclear power plants, so as to effectively control The influence of earthquake motion on the safety of nuclear power plant operation. The seismic monitoring device monitors the ground motion by arranging multiple seismic signal sensors in the free field of the entire nuclear power plant site and typical representative locations of the plant structures, and after a series of algorithm analysis, the results are sent to the main control room for t...

AI Technical Summary

Problems solved by technology

[0006] It may cause false alarms of non-destructive earthquakes such as local earthquakes and small earthquakes, because even if the peak acceleration of the earthquake motion is relatively large, if the high-frequency components of the earthquake motion are rich, the energy of the earthquake motion may be relatively low instead, which has no effect on the operation of the nuclear power plant. no damaging effects

Therefore, it is unreasonable to use Peak Ground Acceleration (PGA) as the parameter for judging whether a nuclear power plant needs to be shut down by the current nuclear power plant seismic monitoring device, which may cause the operator to trigger the shutdown protection device and cause unnecessary shutdown of the nuclear power plant. cause economic loss

[0007] Secondly, the current seismic monitoring device used in nuclear power projects only sends an alarm to the operator after an earthquake is detected, and the operator decides whether to manually shut down the reactor after checking the seismic data

This not only increases the workload of the operator, but also risks human error

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