EXPERIENCE WITH SEISMIC INSTRUMENTATION AND REALEARTHQUAKE DATA AT NUCLEAR POWER PLANT BEZNAUSWITZERLAND

摘要

This paper deals with the aspects of design specification, bid evaluation and, seismic criteria used forthe generation of seismic alarms etc. The paper also describes how the recorded data is utilized to check thevarious assumptions made in conjunction with the seismic plant design and seismic load generation. Out ofsome 8 seismic events registered so far only one event had the maximum recorded acceleration ofapproximately 28% of OBE Peak Ground Acceleration (PGA).From the real earthquakes experienced and the in-situ free-field ground accelerations recorded, thefree-field response spectra were calculated. The calculated spectra are compared to the Regulatory Guide1.60 Design Response Spectra scaled linearly to the site peak ground acceleration. The free field datarecording units on the weathered rock and at the top of the soil provided a real data to calculate the siteamplification factors. The in-situ amplification calculated is then compared to that used in the seismic design.The recorded acceleration time history at various plant grades were used to generate response spectra. Thecalculated response spectra were in turn compared to the spectra used in the seismic design.