Document: NUREG-0800
Document ID: 29f5ac9f-4962-4021-913a-6375076e03fd
Document Type: srp
Title: SEISMIC SYSTEM ANALYSIS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340566.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
- 2. 10 CFR Part 100, Appendix A, "Seismic and Geologic Siting Criteria for Nuclear Power Plants." 3. C. A. Miller and A. J. Philippacopoulos, "Application of Reduction Methods to Nuclear Power Plant Structures," NUREG/CR-3074, April 1983. 4. "Proceedings of the Workshop on Soil-Structure Interaction," Bethesda, MD, NUREG/CP-0054, June 16-18, 1986. 5. ASCE Standard 4-86, "Seismic Analysis of Safety-Related Nuclear Structures and Commentary on Standard for Seismic Analysis of Safety-Related Nuclear Structures," American Society of Civil Engineers, September 1986. 6. A. .S. Veletsos, "Dynamics of Structure-Foundation Systems," Structural and Geotechnical Mechanics, W. J. Hall, editor, Prentice-Hall, Inc., Englewood Cliffs, NJ, pp. 333-361, 1977. 7. Regulatory Guide 1.122, "Development of Floor Design Response Spectra for Seismic Design of Floor-Supported Equipment or Components." 8. Regulatory Guide 1.92, "Combining Modal Responses and Special Components in Seismic Response Analysis." 9. D. W. Coats, "Recommended Revisions to Nuclear Regulatory Commission Seismic Design Criteria," NUREG/CR-1161, May 1980. 10. C. A. Miller, C. J. Costantino, and A. J. Philippacopoulos, "High Soil- Structure Damping Combined with Low Structural Damping," 7th Structural Mechanics in Reactor Technology (SMiRT) Paper K 10/10, Chicago, IL, 1985. 3.7.2-22 Rev. 2 - August 1989 APPENDIX A TO SRP SECTION 3.7.2 ACCEPTABLE METHODOLOGIES TO ACCOUNT FOR HIGH-FREQUENCY MODES Section 3.7.2 of the SRP requires that sufficient modes be included in a dynamic response analysis to ensure that an inclusion of additional modes does not result in more than a 10 percent increase in responses. The implementation of this requirement may require the inclusion of modes with natural frequencies at which the spectral acceleration roughly returns to the zero-period acceleration. The square-root-of-sum-of-squares (SRSS) combination of such modes is highly inaccurate and may be significantly unconservative. The SRSS