Document: NRC Regulatory Guide
Document ID: 22ccfd5e-c5d8-4615-a02c-32369aa9f533
Document Type: regulatory_guide
Title: Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1930/ML19308B636.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.200
CFR Part: 
CFR Title: 

Content:
-------------------- No objection -------------------- Table 5-2.1-4 Introductory text -------------------- No objection -------------------- DG-1362, Appendix B, Page B-9 Table B-1. Staff Position on ASME/ANS RA-S Case 1, “Case for ASME/ANS RA-Sb-2013 Standard for Level 1/Large Early Release Frequency Probabilistic Risk Assessment of Nuclear Power Plant Applications,” Technical and Peer Review Requirements of a Level 1, Seismic PRA for the At-Power Operating Mode Index No Issue Position Resolution SHA-C1 through SHA-C4 -------------------- No objection -------------------- Notes -------------------- No objection -------------------- Table 5-2.1-5 Introductory text -------------------- No objection -------------------- SHA-D1 The ground motion characterization model needs to include the interface with site response analysis in terms of a reference soil or rock horizon, as defined by shear wave velocity, density, and damping values. Clarification In the ground motion characterization model that determines the range of seismic vibratory ground motion that can occur at a site, INCLUDE (a) credible mechanisms governing estimates of vibratory ground motion that can occur at a site, (b) a review of available historical and instrumental seismicity data (including strong motion data) to assess and calibrate the model, and (c) applicable (existing and/or newly developed) ground motion prediction equations for the ground motion estimates, and (d) reference soil or rock horizon (defined by shear wave velocity, density, and damping values). SHA-D2 -------------------- No objection -------------------- SHA-D3 The ground motion characterization model should include ground motion prediction equations (GMPEs) with alternative distance and magnitude scaling behaviors, not just a range of amplitudes. Clarification ENSURE that uncertainties are included in the model that determine the range of seismic vibratory ground motion that can occur at a site as well as alternative