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:
4 1.59-15 1.59-23 1.59-15 1.59-16 1.59-17 1.59-18 1.59-19 1.59-20 1.59-21 1.59-22 Figure B. I-Water Resources Regions ..................... B.2-Probable Maximum Flood (Enveloping Isolines)-100 Sq. Mi. B.3-Probable Maximum Flood (Enveloping Isolines)-500 Sq. Mi. B.4-Probable Maximum Flood (Enveloping Isolines)-1,000 Sq. Mi. B.5-Probable Maximum Flood (Enveloping Isolines)-5,000 Sq. Mi. B.6-Probable Maximum Flood (Enveloping Isolines)-10,000 Sq. Mi. .B.7--Probable Maximum Flood (Enveloping Isolines)-20,000 Sq. Mi. B.8-Example of Use of Enveloping Isolines ................ TABLE Table B.I--Probable Maximum Flood Data .. 1.59-23 1.59-11 . . . . . . . I g I D D I 0.1 INTRODUCTION This appendix presents timesaving alternative methods of estimating the probable maximum flood (PMF) peak discharge for nuclear facilities on non tidal streams in the contiguous United States. Use of the methods herein will reduce both the time neces sary for applicants to prepare license applications and the NRC staff's review effort. The procedures are based on PMF values deter mined by the U.S. Army Corps of Engineers, by ap plicants for licenses that have been reviewed and ab cepted by the NRC staff, and by the staff and its con. sultants. The information in this appendix was developed from a study made by Nunn, Snyder, and Associates, through a contract with NRC (Ref. 1). PMF peak discharge determinations for the entire contiguous United States are presented in Table B. I. Under some conditions, these may be used directly to evaluate the PMF at specific sites. In addition, maps showing enveloping isolines of PMF discharge for several index drainage areas are presented in Figures B.2 through B.7 for the contiguous United States east of the 103rd meridian, including instructions for and an example of their use (see Figure B.8). Because of the enveloping procedures used in preparing the maps, results from their use are highly conservative. Limitations on the use of these generalized methods of