Research on Improved Seismic Instrumentation System for Nuclear Power Plants

According to the requirements of nuclear safety regulations, power plants must be equipped with seismic instrumentation systems, which are mainly used for monitoring alarm and automatic shutdown during an earthquake. Both second third generation NPPs adopt Peak Ground Acceleration (PGA). However, among acceleration characteristics, isolated prominent single high frequency peaks have no decisive influence on response. Especially when earthquake is at 1 out 7, it likely cause a false or shutdown. In addition, usually takes one month more restart after this paper, improved system based existing proposed. For intensity areas, three components resultant judge 2 4 logic trip system(ASTS). low failure level evaluated quickly by using acceleration, instrument intensity, cumulative absolute velocity, floor response spectrum other multi-parameters, avoiding unnecessary long-term inspection.