Document: NUREG-0800
Document ID: 904b56ce-40c5-4058-b0ad-837d98f63c2a
Document Type: srp
Title: PROBABLE MAXIMUM FLOOD (PMF) ON STREAMS AND RIVERS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730405.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.3
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of issues related to hydrology Secondary - None I. AREAS OF REVIEW Chapter 2 of the Standard Review Plan (SRP) discusses the site characteristics that could affect the safe design and siting of the plant. The staff reviews information presented by the applicant for a construction permit (CP), operating license (OL), design certification (DC), early site permit (ESP), or combined license (COL) concerning hydrological setting of the site as they relate to safety-related structures, systems, and components (SSC). This SRP section applies to reviews performed for each of these types of applications. The staff’s review and findings are described in the appropriate section of the safety evaluation report (SER). In this section of the safety analysis report (SAR), the hydrometeorological design basis is developed to determine the extent of any flood protection required for those SSC necessary to ensure the capability to shut down the reactor and maintain it in a safe shutdown condition. 2.4.3-2 Revision 4 - March 2007 The specific areas of review are as follows: 1. Design Bases for Flooding in Streams and Rivers A. Applicable drainage area for flooding in streams and rivers adjacent to the site that may result in flooding at the site. B. Probable maximum precipitation (PMP) over the applicable drainage area. C. Precipitation losses over the applicable drainage area. D. Runoff response characteristics of the applicable drainage area. E. Accumulation of flood runoff through river channels and reservoirs to estimate the PMF hydrograph at the plant site and determination of water level conditions at the site with coincident wind-generated waves during the PMF event. F. Dynamic effects of flood on SSC important to safety. 2. Design Bases for Site Drainage A. Runoff for site drainage and drainage areas adjacent to the plant site, including the roofs of safety-related structures, produced by local intense