Document: NUREG-0800
Document ID: c97c665c-1f0f-4a2d-a4db-4e0dbd99eab3
Document Type: srp
Title: CHANNEL DIVERSIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730434.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.9
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 a 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 applicant’s safety analysis report (SAR), the geohydrologic design basis is developed to ensure that the plant and essential water supplies will not be adversely affected. This review includes stream channel diversions away from the site (which may lead to loss of safety related water) and stream channel diversions towards the site (which may lead to flooding). Additionally, in such an event, the applicant needs to show that alternate water supplies are available to safety-related equipment. 2.4.9-2 Revision 3 - March 2007 The specific area of review are as follows: 1. Historical Channel Diversions: The staff reviews historical channel migration phenomena including cutoffs, subsidence and uplift. 2. Regional Topographic Evidence: The staff reviews regional topographic evidence which suggests that future channel diversion may or may not occur (used in conjunction with evidence of historical diversions) 3. Ice Causes: The staff reviews thermal causes of channel diversion such as ice jams (coordinate review with that of SAR Section 2.4.7). These diversions may result from downstream ice blockages that may lead to flooding from backwater, or they can be upstream ice