Seismic demands on secondary systems in base-isolated nuclear power plants

Seismic demands on secondary systems in base-isolated nuclear power plants - Printable Version

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Seismic demands on secondary systems in base-isolated nuclear power plants - david-smith - 06-04-2012

SUMMARY
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-designbasis
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 q 2007 John Wiley & Sons, Ltd.
Received 5 October 2005; Revised 15 April 2007; Accepted 17 April 2007
KEY WORDS: nuclear power plant; secondary systems; seismic base isolation; viscous dampers; performance
spaces

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