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:
-1. Appendix 6-A -------------------- No objection -------------------- 6-A-1 References Clarification See global comment on references at start of Table A-1. DG-1362, Appendix A, Page A-40 Table A-7. Staff Position on ASME/ANS RA-Sa-2009, Part 7, Technical and Peer Review Requirements for At-Power High Wind Events Index No Issue Position Resolution Section 7-1 7-1 -------------------- No objection -------------------- Section 7-2 7-2 -------------------- No objection -------------------- 7-2.1 – WHA 7-2.1 -------------------- No objection -------------------- Table 7-2.1-1 -------------------- No objection -------------------- Tables 7-2.1-2(a) and 7-2.1-2(b) WHA-A1 The six elements described in NOTE WIND-A1 provide the details required for the tornado wind hazard analysis and should be included in WIND-A1 as requirements. Qualification Cat II and III: In the tornado wind hazard analysis, USE … a mean hazard curve can be derived. INCLUDE the following elements in the tornado wind hazard analysis: (1) Variation of tornado intensity with occurrence frequency (The frequency of tornado occurrence decreases rapidly with increased Intensity); (2) Correlation of tornado width and length of damage area; longer tornadoes are usually wider; (3) Correlation of tornado area and intensity; stronger tornadoes are usually larger than weaker tornadoes; (4) Variation in tornado intensity along the damage path length; tornado intensity varies throughout its life cycle; (5) Variation of tornado intensity across the tornado path width. (6) Variation of tornado differential pressure across the tornado path width. NOTE WIND-A1: State-of-the-art methodologies are given ... can be found in Refs. 13, 56, and 57. DG-1362, Appendix A, Page A-41 Table A-7. Staff Position on ASME/ANS RA-Sa-2009, Part 7, Technical and Peer Review Requirements for At-Power High Wind Events Index No Issue Position Resolution Tornado wind hazard analysis SHOULD include the following elements: (a) variation of