Document: NUREG-0800
Document ID: 585516eb-af20-45dc-a470-9638ec9381f3
Document Type: srp
Title: Each calculated spectrum of the artificial time history is considered to envelop
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070640306.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.0
CFR Part: 
CFR Title: 

Content:
the requirements of 10 CFR Part 50 and 10 CFR Part 52, and were approved by the Office of Management and Budget, approval number 3150-0011 and 3150-0151. PUBLIC PROTECTION NOTIFICATION The NRC may not conduct or sponsor, and a person is not required to respond to, a request for information or an information collection requirement unless the requesting document displays a currently valid OMB control number. 3.7.1-22 Revision 3 - March 2007 ( ) ( ) S f F f T o D = 2 2 2 π APPENDIX A TO SRP SECTION 3.7.1 SPECIFICATION FOR MINIMUM POWER SPECTRAL DENSITY (PSD) REQUIREMENT For a Regulatory Guide (RG) 1.60 horizontal response spectrum anchored to 1.0 g, the following minimum PSD requirement should be satisfied. For other peak accelerations, this PSD requirement should be scaled by the square of the peak acceleration. The one-sided PSD is related to the Fourier amplitude of the time history by the ( ) F f equation ......................................................................................(1) where is the strong motion duration over which is evaluated. This duration TD ( ) F f TD represents the duration of near maximum and nearly stationary power of an acceleration time history record. Additional guidance on estimation of for artificial time history or actual TD earthquake time history is provided in Appendix B of NUREG/CR-5347. The average one-sided PSD defined by Equation (1) should exceed 80 percent of the target PSD as defined by Equation (2) from 0.3 Hz to 24 Hz. Less than 2.5 Hz = 0.419 m 2/sec 3 ( / 2.5 Hz) 0.2 ( ) S f o f 2.5 Hz to 9.0 Hz = 0.419 m 2/sec 3 (2.5 Hz / ) 1.8 ........................................................................(2) ( ) S f o f 9.0 Hz to 16.0 Hz = 418 cm 2/sec 3 (9.0 Hz / ) 3 ( ) S f o f Greater than 16 Hz = 74.2 cm 2/sec 3 (16.0 Hz / ) 8 ( ) S f o f At any frequency the average PSD is computed over a frequency band width of ±20 f , percent, centered on the frequency (e.g., 4 Hz to 6 Hz band width for = 5 Hz). f f The power