Variability of Dynamic Characteristics of Nuclear Power Plant Structures. Seismic Safety Margins Research Program (SSMRP)

摘要

This report presents the results of an investigation of the sources of random variability of the dynamic response of nuclear power plant structures. Sources affecting both the frequencies and dynamic amplification of structures are identified. Numerical values developed for the Zion auxiliary building are presented for sources of inherent randomness. Several sources of uncertainty resulting from lack of knowledge of material properties or approximations in analytical modelling are discussed but are not in general quantified. The dispersion in both the structure dynamic characteristics and the input to equipment as defined by the in-structure response spectra is addressed. The evaluation of the dynamic response variability is limited to elastic response levels.