Document: NRC Regulatory Guide
Document ID: ee571544-47f4-47c8-b15f-c0f8619885f5
Document Type: regulatory_guide
Title: Design-Basis Hurricane and Hurricane Missiles for Nuclear Power Plants + HISTORY - HISTORY 08/2012 – DG-1247 ,Proposed Revision 0
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1004/ML100480890.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.221
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CFR Title: 

Content:
10 of the Code of Federal Regulations, Part 50 (10 CFR Part 50), “Domestic Licensing of Production and Utilization Facilities” (Ref. 1), requires that structures, systems, and components that are important to safety shall be designed to withstand the effects of natural phenomena, such as hurricanes, without loss of capability to perform their safety functions. GDC 2 also requires that the design bases for these structures, systems, and DG-1247, Page 2 components shall reflect (1) appropriate consideration of the most severe of the natural phenomena that have been historically reported for the site and surrounding area, with sufficient margin for the limited accuracy, quantity, and period of time in which the historical data have been accumulated, (2) appropriate combinations of the effects of normal and accident conditions with the effects of the natural phenomena, and (3) the importance of the safety functions to be performed. GDC 4, “Environmental and Dynamic Effects Design Bases,” of Appendix A to 10 CFR Part 50 requires, in part, that structures, systems, and components that are important to safety shall be adequately protected against the effects of missiles resulting from events and conditions outside the plant. For stationary power reactor site applications submitted before January 10, 1997, paragraph 100.10(c)(2) of 10 CFR Part 100, “Reactor Site Criteria” (Ref. 2), states that meteorological conditions at the site and in the surrounding area should be considered in determining the acceptability of a site for a power reactor. For stationary power reactor site applications submitted on or after January 10, 1997, 10 CFR 100.20(c)(2) requires that meteorological characteristics of the site that are necessary for safety analysis or may have an impact on plant design (such as maximum probable windspeed) must be considered in determining the acceptability of a site for a nuclear power plant. In addition, 10 CFR 100.21(d) requires that the physical