Document: NUREG-0800
Document ID: 81f4143f-227f-4d30-9822-097124aa5c05
Document Type: srp
Title: FLOODS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070240.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.2
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Structural & Geosciences Branch (ESGB)Civil Engineering and Geosciences Branch (ECGB)1 Secondary - None I. AREAS OF REVIEW This section of the safety analysis report (SAR) identifies historical flooding (defined as occurrences of abnormally high water stage or overflow from a stream, floodway, lake, or coastal area) at the proposed site or in the region of the site. It summarizes and identifies the individual types of flood-producing phenomena, and combinations of flood-producing phenomena, considered in establishing the flood design bases for safety-related plant features. It also covers the potential effects of local intense precipitation. Although topical information may appear in SAR Sections 2.4.3 through 2.4.7, the types of events considered and the controlling event are reviewed in this section. The flood history and the potential for flooding are reviewed for the following sources and events. Factors affecting potential runoff (such as urbanization, forest fire, or change in agricultural use), erosion, and sediment deposition are considered in the review. 1. Stream flooding a. Probable maximum flood (PMF) with coincident wind-induced waves, considering dam failure potential due to inadequate capacity, inadequate flood-discharge capability, or existing physical condition. DRAFT Rev. 4 - April 1996 2.4.2-2 b. Ice jams, both independently and coincident with a winter probable maximum storm. c. Tributary drainage area PMF potential. d. Combinations of less severe river floods, coincident with surges and seiches. 2. Surges a. Probable maximum hurricane (PMH) at coastal sites. b. PMH wind translated inland and resulting wave action coincident with runoff-induced flood levels. c. Probable maximum wind-induced (non-hurricane) storm surges and waves. d. Combinations of less severe surges, coincident with runoff floods. 3. Seiches a. Meteorologically induced in inland lakes (e.g., Great Lakes and harbors) and at coastal harbors and