Application of RVT for generation of floor response spectra for the PSA elaboration

The current paper considers the application of random vibration theory (RVT) for the purpose of seismic probabilistic safety analysis (SPSA) of nuclear power plants. The theory basics and assumptions are summarized, as well as an approved method for application of RVT for the probabilistic assessment of structural response to seismic excitations. The advantages and limitations of the method application are investigated through a dynamic response analysis of a WWER- 1000 reactor building. The building response is analyzed by the standard flexible volume method for dynamic SSI analysis in the frequency domain. Two approaches are used for the definition of the input motion – a set of accelerograms and a mean uniform hazard response spectrum. The resultant floor acceleration response spectra are compared for both of the approaches and used as a verification of the conclusions made, concerning the reliability and specifics of the RVT techniques used for probabilistic assessment of structural response to seismic excitations. Keywords: dynamic analysis, earthquake, probabilistic safety analysis, response spectra, random vibration. (author)