Nuclear Regulatory Commission (NRC) Guide 1.60

This spectrum data can be accessed by selecting the file “NRC_G1.6_2014.spe” available in the folder “Spectrum Library” through Layout window >Misc> Spectrums > File > Library. This library have ten (10) predefined spectrums are based upon Safe Shutdown Earthquake (SSE) for Horizontal and Vertical Design Response Spectra corresponding to 0.5, 2.0, 5.0, 7.0 and 10% Damping factors as shown in the figure below (taken from NRC Guide 1.60, July 2014, Revision 2)

These predefined spectrums are named in the CAPIPE spectrum library as follows.

· NRC-HDS-D0.5 (Horizontal Design Spectra with 0.5% Damping Factor)

· NRC-HDS-D2 (Horizontal Design Spectra with 2% Damping Factor)

· NRC-HDS-D5 (Horizontal Design Spectra with 5% Damping Factor)

· NRC-HDS-D7 (Horizontal Design Spectra with 7% Damping Factor)

· NRC-HDS-D10 (Horizontal Design Spectra with 10% Damping Factor)

· NRC-VDS-D0.5 (Vertical Design Spectra with 0.5% Damping Factor)

· NRC-VDS-D2 (Vertical Design Spectra with 2% Damping Factor)

· NRC-VDS-D5 (Vertical Design Spectra with 5% Damping Factor)

· NRC-VDS-D7 (Vertical Design Spectra with 7% Damping Factor)

· NRC-VDS-D10 (Vertical Design Spectra with 10% Damping Factor)

The horizontal and vertical component Design Response Spectra in Figures 1 and 2 correspond to a maximum horizontal ground acceleration of 1.0g. For sites with different acceleration values specified for the design earthquake, the Design Response Spectra should be linearly scaled from Figures 1 and 2 in proportion to the specified maximum horizontal ground acceleration. This proportion factor calculated can be applied in CAEPIPE as a scale factor through Layout window > Loads > Spectrum > Factor (s).