Document: NUREG-0800
Document ID: 6171d065-38ce-4cde-aa53-058baf32948a
Document Type: srp
Title: 2.82
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1419/ML14198A460.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.16
CFR Part: 
CFR Title: 

Content:
opment of Target PSD for Other Response Spectral Shapes For a design response spectrum different from the NUREG/CR-6728 bin representative RSrep, the iterative frequency-by-frequency scaling procedure described in Section B.1 can still be applied to generate the target PSD for a given design RS. The development of the target PSD in these cases is reviewed and accepted on a case-by-case basis. It is noted that a proper choice of the initial PSD can accelerate the convergence process; for this purpose, it is recommended to use the following guidance to select the initial PSD: (1) For a NUREG/CR-6728 design RS other than the bin representative RS (i.e., the moment magnitude and the fault distance take values other than bin midpoint values), the corresponding target PSD in Table 1 or 2 can be used; (2) For a RS enveloping several NUREG/CR-6728 bin representative RS, the envelope of the corresponding target PSD (with proper scaling using PGA) can be used; (3) For other RS (e.g., the vertical NUREG/CR-6728 RS or site specific RS not developed as the envelope of bin representative RS), an initial PSD can be determined by enveloping several tabulated target PSD, provided the envelope of the corresponding RS can reasonably resemble the subject RS. Note that the initial PSD does not need to be very close to the target PSD obtained after convergence; a proper initial PSD only speeds up the convergence process. 3.7.1-34 Revision 4 – December 2014 Table 3 – Horizontal Bin Average 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 0.29 0.004 1.27 0.14 0.028 0.36 4.83 2.03 0.92 1.48 0.15 0.35 0.006 1.65 0.22 0.043 0.52 8.68 3.01 1.45 2.47 0.19 0.40 0.008 2.49 0.41 0.072 0.79 14.17 4.66 2.63 4.52 0.24 0.50 0.017