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Numerical models of a sample nuclear power plant (NPP) reactor building, both conventionally constructed and equipped with seismic protective systems, are analysed for both safe shutdown and beyond‐design‐basis earthquake shaking at two coastal sites in the United States. Seismic demands on secondary systems are established for the conventional and seismically isolated NPPs. The reductions in secondary‐system acceleration and deformation demands afforded by the isolation systems are identified. Performance spaces are introduced as an alternate method for evaluating demands on secondary systems. The results show that isolation systems greatly reduce both the median and dispersion of seismic demands on secondary systems in NPPs. Copyright © 2007 John Wiley & Sons, Ltd.

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This paper presents the out-of-plane flexural behavior and design guidelines for steel-plate reinforced concrete (SC) wall systems subjected to simultaneous mechanical and thermal loading. A fiber-based analytical approach was used to predict the fundamental behavior of steam generator compartment walls subjected to postulated accident causing about 10 psi uniform internal pressure and exposed surface temperature of ! 300°F for duration of two hours. The analytical approach was verified by using it to predict the experimental behavior of SC specimens tested previously by the authors. The analytical results were used to develop simple design guidelines for calculating stresses in the steel faceplates of SC walls subjected to simultaneous thermal and mechanical loading. Lastly, the analytical approach is used to predict and compare, i.e., illustrate similarities and differences between the behavior of SC and conventional reinforced concrete RC walls subjected to simultaneous thermal and mechanical loading.