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:
n B.2 of this appendix and are reviewed and accepted by the NRC staff on a case-by-case basis. 3.7.1-29 Revision 4 – December 2014 The averaged one-sided PSD defined by Equation (1) should exceed 70 percent of the target PSD in Tables 1 and 2 or developed using the guidelines described in this appendix. When the target PSD in Tables 1 and 2 are used, linear interpolation of the data should be performed in the log-log scale to determine PSD values for frequencies other than the tabulated frequencies. The minimum check is set at 70 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 specified design response spectrum. The use of 70 percent in Appendix B is comparable to the effect of the 80 percent criterion in Appendix A, because the response spectra compatible with the target PSD in Tables 1 and 2 of Appendix B match more closely to the design response spectra (Equations (3) and (4)) than do the response spectra compatible with the target PSD in Appendix A, which were generally lower than the design response spectra based on RG 1.60. In general, power below 0.3 Hz has no influence on stiff nuclear plant structures, so that checks below 0.3 Hz are unnecessary. The upper bound frequency (cutoff frequency) should be consistent with the design response spectrum. 3.7.1-30 Revision 4 – December 2014 Table 1 – Horizontal Target PSD for CEUS Rock Sites (×10-3 m2/s3) Frequency (Hz) M 5-6 M 6-7 M 7+ 0-50 km 50-100 km 0-10 km 10-50 km 50-100 km 100-200 km 0-10 km 10-50 km 50-100 km 100-200 km 0.12 0.001 0.66 1.14 0.95 1.93 4.77 9.26 7.68 18.95 0.15 0.014 0.021 1.01 1.65 1.73 2.73 7.39 12.34 12.94 24.05 0.19 0.077 0.10 1.61 2.49