A consistent technique is derived for generating floor response spectra for equipment in nuclear reactor systems using response spectral analysis. The use of this technique eliminates the requirement for a time history analysis. The technique is based on the dynamic theory of coupling the supporting building with a very light spring-mass system representing the equipment. The response of the spring-mass system in the coupled systems is the floor response spectrum at the spring-mass system frequency. Resonant and off-resonant cases are derived separately. This technique is more efficient in the use of computer time than the conventional time history techniques. Moreover, a more realistic response spectrum is generated by this technique.

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