Abstract：On August 23, 2023, the seismic instrument system of the Hongyanhe Nuclear Power Plant successfully recorded a M4.6 earthquake in Pulandian, Dalian. This is the first complete strong earthquake record around the nuclear power plant area in China. We analyze the seismic data recorded by the system, and the data playback shows that the seismic recorded data was clear and complete, and the peak value of the free field monitoring data is consistent with the calculation result of the seismic attenuation empirical formula. Comparing the peak acceleration values of seven monitoring points data, the result shows that the nuclear power plant building has an amplification effect on seismic acceleration signals, and the amplification coefficient is positively correlated with building elevation. The conclusion of spectral analysis of peak acceleration data shows that predominant frequency points of seismic response data in nuclear power plant buildings are mainly concentrated in the range of 10 to 20 Hz, and seismic acceleration signals in the range of 10 to 20 Hz also have certain destructive effects on the building. This conclusion is inconsistent with the seismic triggering filtering range (1 to 10 Hz) specified in NB/T 20076-2012 seismic instrument criteria, due to the fact that the seismic trigger recognition algorithm of the seismic instrument system is set in a filtering range of 1 to 10 Hz. This defect will reduce the performance of the seismic instrument system’s depth safety defense.
WU Xiongwei,YANG Jiang,XIA Jiening et al. Post-Earthquake Data Analysis of Seismic Instrument System at Hongyanhe Nuclear Power Plant[J]. jgg, 2024, 44(9): 985-990.
