Recommendations for Revision of Seismic Damping Values in Regulatory Guide 1.61 (NUREG/CR-6919)

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Publication Information

Manuscript Completed: September 2006
Date Published:
November 2006

Prepared by:
R.J. Morante

Brookhaven National Laboratory
Upton, NY 11973-5000

H.L. Graves, NRC Program Manager

Prepared for:
Division of Fuel, Engineering and Radiological Research
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

NRC Job Code N6185

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This report provides recommendations developed by Brookhaven National Laboratory (BNL) for revision of the damping values in U.S. Nuclear Regulatory Commission (NRC) Regulatory Guide 1.61, "Damping Values for the Seismic Design of Nuclear Power Plants," Rev. 0, issued October 1973. The recommendations included herein are based on the results of various damping studies, as well as NRC licensing actions related to the resolution of damping issues. Recommendations of the NRC Damping Task Force, and additional work performed by BNL to address staff questions have been incorporated into the final recommendations.

The recommendations in this document considered recently published guidance on damping for seismic analysis included in ASCE Standard 43-05, "Seismic Design Criteria For Structures, Systems, and Components in Nuclear Facilities" and ASME Boiler and Pressure Vessel Code, Section III, Division 1, Non-Mandatory Appendix N, "Dynamic Analysis Methods", 2004 Edition.

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