Document: NRC Regulatory Guide
Document ID: c7b1689b-ff17-4083-9fb1-f91b6965ea1a
Document Type: regulatory_guide
Title: Design Basis Floods for Nuclear Power Plants + HISTORY - HISTORY 02/2022 – DG-1290 , Proposed Revision 3 09/2014 – Periodic Review of Revision 2 – Revise 07/1980 – Errata to Revision 2 07/2024 – DG-1290 Revision 1 (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740388.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.59
CFR Part: 
CFR Title: 

Content:
o the guideline exposures of 10 CFR Part 100. These same structures, systems, and components should also be designed to withstand conditions resulting from the design basis flood and retain capability for cold shutdown and maintenance thereof of other types of nuclear power plants. It is expected that safety-related structures, systems, and components of other types of nuclear power plants will be identified in future regulatory guides. In the interim, Regulatory Guide 1.29 should be used as guidance when identifying safety-related structures, systems, and components of other types of nuclear power plants. 1.59-5 I I designed to withstand and retain capability for cold shutdown and maintenance therof. For sites along streams, the PMF generally provides the design basis flood. For sites along lakes or seashores, a flood condition of comparable severity could be produced by the most severe com-. bination of hydrometeorological parameters reasonably possible, such as may be produced by a Probable Maximum Hurricane4 or by a Probable Maximum Seiche. On estuaries, a Probable Max imum River Flood, a Probable Maximum Surge, a Probable Maximum Seiche, or a reasonable com bination of less severe phenomenologically caused flooding events should be considered in arriving at design basis flood conditions comparable in fre quency of occurrenfe with a PMF on streams. In addition to floods produced by severe hydrometeorological conditions, the most severe seismically induced floods reasonably possible should be considered for each site. Along streams and es tuaries, seismically induced floods may be produced by dam failures or landslides. Along lakeshores, coastlines, and estuaries, seismically induced or tsunami-type flooding should be considered. Con sideration of seismically induced floods should in clude the same range of seismic events as is postulated for the design of the nuclear plant. For in stance, the analysis of floods caused by dam failures, landslides, or tsunami