Document: NRC Regulatory Guide
Document ID: cfc61809-5745-460f-8a26-13c168659924
Document Type: regulatory_guide
Title: Identification and Characterization of Seismic Sources and Determination of Safe Shutdown Earthquake Ground Motion
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740084.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.165
CFR Part: 
CFR Title: 

Content:
values of P> 100 (m,d)l and P(m,d)2 are used with m and d values corresponding to the mid-point of the magnitude of the bin (5.25, 5.75, 6.25, 6.75, 7.3) and centroid of the ring area (10, 20.4, 38.9, 77.8, 155.6, 253.3, and somewhat arbitrarily 350 km). Note that the mid-point of the last magnitude bin may change because this value is dependent on the maximum mag nitudes used in the hazard analysis. For this example site, the controlling earthquake characteristics (magni tudes and distances) are given in Table C.11. Step 8 The SSE response spectrum is determined by the procedures described in Appendix F. C.4 SITES NOT IN THE CEUS The determination of the controlling earthquakes and the seismic hazard information base for sites not in the CEUS is also carried out using the procedure described in Section C.2 of this appendix. However, because of differences in seismicity rates and ground motion attenuation at these sites, alternative magnitude-distance bins may have to be used. In addi tion, as discussed in Appendix B, an alternative refer ence probability may also have to be developed, par ticularly for sites in the active plate margin region and for sites at which a known tectonic structure dominates the hazard. Table C.11 Magnitudes and Distances of Controlling Earthquakes from the LLNL Probabilistic Analysis 1-2.51Hz 5 - 10Hz Mc and Dc > 100 km MK and Dc 6.7 and 157 km 5.7 and 17 km 1.165-23 .I I II K .01. e "01-0-.., 1H z .01 e- no."• ~~N. 1 e-6 I e-8 Ile-9 • . \ N le--85 *. 10 100 1000 Sa ~cm/s**2 Figure C.A Total Median Hazard Curves 1.165-24 .001 le-4 1 e-5 le-6 1 e-7 1 e-8 1 e-9 10 100 1000 Sa - cm/s**2 Figure C.2 1 Hz Median Hazard'Curve for Distance Bin 25 - 50 km & Magnitude Bin 6 - 6.5 1,165-25 Magnitude bins "D5c 25-50 50-100 0 Distance bins 1020200-300 > 300 Figure C.3 Full Distribution for Average of 5 and 10 Hz K 1.165--26 0 0 "I '5 0. 35 .0 •)25 .0 - 15 •. O ••66.5->7 Magnitude bins 5-5.5 0-15 15-25 " •"--• .• 25-50 50-100 100-200