Earthquake monitoring methods, devices and systems of nuclear power plants

Abstract

The invention discloses a nuclear power plant earthquake monitoring method, device and system. The earthquake monitoring method includes: when an earthquake is detected, obtaining the free field earthquake response time course of several main monitoring sensors within a preset time period before the triggering moment. Data, nuclear island base layer seismic response time history data; calculate the free field seismic response spectrum and free field standard cumulative absolute velocity, respectively calculate the nuclear island base layer seismic response spectrum and nuclear island base layer standard cumulative absolute velocity; when the free field earthquake If both the response spectrum and the free-field standard cumulative absolute velocity exceed the preset shutdown threshold, or if both the seismic response spectrum and the standard cumulative absolute velocity of the nuclear island base layer exceed the preset shutdown threshold, a shutdown will be triggered. Compared with the existing technology, the present invention uses seismic response spectrum and standard cumulative absolute velocity as parameters for earthquake impact evaluation, which can stably and accurately evaluate the impact and intensity of earthquakes and avoid false triggering.

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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