Document: NRC Regulatory Guide
Document ID: 239cc7c1-f2cb-46cc-945d-8009db28aa6c
Document Type: regulatory_guide
Title: General Site Suitability Criteria for Nuclear Power Stations + HISTORY - HISTORY 12/2023 – DG-4034 , Proposed Revision 4 12/2011 – DG-4021 , Proposed Revision 3 02/1995 – DG-4004, Second Proposed Revision 2 11/1992 – DG-4003, Proposed Revision 2 (Rev. 4)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML2312/ML23123A090.pdf
Revision Date: 2023-10
Chapter: 
Section ID: RG-4.7
CFR Part: 
CFR Title: 

Content:
s floods for coastal, estuary, and Great Lakes sites. This method accounts for sea level rise and other global climate change effects. It is generally possible to control the effects on station safety functions of a probable maximum flood (as defined in RG 1.59), seiche, surge, or seismically induced flood (such as might be caused by a DG-4034, Page 24 dam failure or tsunami) through engineering design or protection of the safety-related SSCs identified in RG 1.29. NUREG-0800, section 2.4, describes how the NRC staff will review design -basis flooding and flood mechanisms at power reactor sites. ANSI/ANS-2.8-2019, DOE-STD-2020, and DOE-HDBK-1220 give more information on estimating flooding hazards. 1.7.2 Water Availability Nuclear power stations require reliable sources of water for steam condensation, service water, the emergency core cooling system, and other functions. Where water is in short supply, closed-cycle cooling or the recirculation of the hot cooling water through cooling towers, artificial ponds, or impoundments has been practiced. 1.7.2.1 Relevant Regulations • 10 CFR 100.10, “Factors to be considered when evaluating sites;” • 10 CFR 100.20, “Factors to be considered when evaluating sites;” and • 10 CFR 100.23, “Geologic and seismic siting criteria.” 1.7.2.2 Related Guidance • RG 1.59, “Design Basis Floods for Nuclear Power Plants”; • RG 1.27, “Ultimate Heat Sink for Nuclear Power Plants;” • NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition.” 1.7.2.3 Considerations, Regulatory Experience, and Staff Position A safety-related water supply is required for normal or emergency shutdown and cooldown, and for fire protection. An applicant should show that a highly dependable system of water sources is available under postulated occurrences of natural phenomena and site-related accidental phenomena, or combinations of such phenomena, as discussed in RG 1.59. RG