Document: NUREG-0800
Document ID: 94da2f11-6df6-47d0-a25e-edeb21a4d649
Document Type: srp
Title: 3.7.1-12
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1419/ML14198A460.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.0
CFR Part: 
CFR Title: 

Content:
., 4 Hz to 6 Hz band width for ݂ = 5 Hz). 3.7.1-26 Revision 4 – December 2014 The power above 24 Hz for the target PSD is so low as to be inconsequential so that checks above 24 Hz are unnecessary; however, note that the response spectrum calculations are performed beyond 24 Hz as governed by RG 1.60 definitions. Similarly, power below 0.3 Hz has no influence on stiff nuclear plant facilities, so that checks below 0.3 Hz are unnecessary. This minimum check is set at 80 percent of the target PSD so as to be sufficiently high to prevent a deficiency of power over any broad frequency band, but not so high that it introduces additional conservatism over that already embodied in the RG 1.60 response spectrum. REFERENCES 1. NUREG/CR-3509, “Power Spectral Density Functions Compatible with NRC Regulatory Guide 1.60 Response Spectra,” June 1988. 2. NUREG/CR-5347, “Recommendations for Resolution of Public Comments on USI A--0, Seismic Design Criteria,” June 1989. 3. RG 1.60, “Design Response Spectra for Seismic Design of Nuclear Power Plants.” 3.7.1-27 Revision 4 – December 2014 APPENDIX B TO SRP SECTION 3.7.1 GUIDANCE ON MINIMUM POWER SPECTRAL DENSITY FOR NUREG/CR-6728 BASED DESIGN SPECTRA OR OTHER SPECTRA While Appendix A to SRP Section 3.7.1 provides guidance on the minimum PSD for a RG 1.60 horizontal response spectrum, this appendix presents guidance on developing minimum PSD for a response spectrum with a shape consistent with the magnitude and distance bins in NUREG/CR-6728, as well as guidance for other spectral shapes. The one-sided PSD for an acceleration time history ܽሺݐሻ, is related to its Fourier amplitude |ܨሺ߱ሻ| by the following equation: ܵ௢ሺ߱ሻൌ2|ܨሺ߱ሻ|ଶ 2ߨܶ஽ (1) In which ܶ஽ is the strong motion duration over which ܨሺ߱ሻ is evaluated; ߱ represents the circular frequency (in rad/s) and is defined as: ߱ൌ2ߨ݂, where ݂ is the natural frequency (in Hz). The duration ܶ஽ represents the duration of near