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Assessment of Dynamic Response of Massive Structure by means of Nondestructive Evaluation Using Vibrations from Minor Seismic Event

Abstract The Reactor Building of the Embalse Nuclear Power Plant, located in Córdoba, Argentina, consists of a prestressed concrete outer shell and dome, an internal building formed by several concrete slabs and shear walls, founded on a 1.7-m thick concrete mat bearing on soils. The mass of the entire structure is 64,000 metric tons and the outside diameter of the shell is 43.7 m. The plant became operational in the early 1980s and its license is due for renewal in 2010, for which efforts are being carried out in order to reassess the adequacy of the structure in light of updated design requirements. As a part of this effort, the University of Córdoba was retained in order to setup a numerical model capable of reproducing the dynamic behavior of the soil-structure system in order to perform updated analyses. A finite element model was setup using available information from original design drawings and reports, whereas the soil stiffness profile at the site was derived by means of the Spectral Analysis of Surface Wave method, which was performed at several locations within the site. Available records of acceleration time histories, obtained inside the building during a minor earthquake event, were used in order to verify model assumptions. Thus, the predicted vs. asbuilt response of the soil-structure system were compared both in terms of floor response spectra and transfer functions. Results showed that the measured response matches the model predictions reasonably well within the frequency range of interest when considering response spectra. Comparisons in terms of transfer functions showed similar trends and values, but erratic trends were observed in the experimentally derived data within frequency ranges where the seismic input was weak.