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:
US. Nuclear Regulatory Commision. Washington. D.C. 20555. Attention: Director. Division of Document Control. I UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 July 30, 1980 ERRATA Regulatory Guide 1.59, Revision 2, August 1977 "Design Basis Floods for Nuclear Power Plants" New information that affects the Probable Maximum the Upper Ohio River for drainage areas of 10,000 has been identified. The changes to the isolines in the Upper Ohio River Basin and do not have any the Design Basis Flood for existing plants. Flood (PMF) isolines for and 20,000 square miles affect only a small area significant impact on As a result of the new information, revised Figures B.6 and B.7 transmitted herewith should be used in future PMF discharge determinations when the simplified methods presented in Appendix B to the Regulatory Guide are being used. In addition, appropriate changes have been made to the PMF data on pages 28 and 30 of Table B.1, which are also transmitted herewith. TABLE OF CONTENTS Page A. INTRODUCTION ... ........................................ 1.59-5 B. DISCUSSION .. ............................................. 1.59-5 C. REGULATORY POSITION .................................... 1.59-7 D. IMPLEMENTATION ........................................ 1.59-8 APPENDIX A-Probable Maximum and Seismically Induced Floods on Streams and Coastal Areas 1.59-9 APPENDIX B-Alternative Methods of Estimating Probable Maximum Floods ........... 1.59-11 APPENDIX C-Simplified Methods of Estimating Probable Maximum Surges ............ 1.59-41 *Lines indicate substantive changes from previous issue. 1.59-3 A. INTRODUCTION General Design Criterion 2, "Design Bases for Protection Against Natural Phenomena," of Appen dix A, "General Design Criteria for Nuclear Power Plants," to 10 CFR Part 50, "Licensing of Produc tion and Utilization Facilities," requires, in part, that structures, systems, and components important to safety be designed to withstand the effects of natural