Document: NUREG-0800
Document ID: a10a3c35-4db9-4a81-a9a5-1b4fface972a
Document Type: srp
Title: CHANNEL DIVERSIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070255.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.9
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Hydrologic & Geotechnical Engineering Branch (HGEB)Civil Engineering and Geosciences Branch (ECGB)1 Secondary - None I. AREAS OF REVIEW In this section of the applicant's safety analysis report (SAR), the geohydrologic design basis is developed to assure ensure that the plant and essential water supplies will not be adversely 2 affected by natural stream channel diversion or that, in such an event, alternate water supplies are available to safety-related equipment. The review includes: 1. Historical channel diversions, including cutoffs and subsidence. 2. Regional topographic evidence which suggests that future channel diversion may or may not occur (used in conjunction with evidence of historical diversions). 3. Alternate water sources and operating procedures (coordinate review with that of SAR Section 2.4.11.6). DRAFT Rev. 3 - April 1996 2.4.9-2 II. ACCEPTANCE CRITERIA Acceptance criteria for this SRP Standard Review Plan (SRP) section relate to the following 3 regulations: 1. General Design Criterion 2 (GDC 2) requires that structures, systems, and components important to safety be designed to withstand floods. 2. General Design Criterion 44 (GDC 44) requires an ultimate heat sink capable of accepting the plant's heat load under normal and accident conditions. 3. 10 CFR Part 100 requires that hydrological characteristics be considered in the evaluation of the site. To meet the requirements of GDC 2, GDC 44, and 10 CFR Part 100 as they relate to channel diversions, the following specific criteria are used: 1. A description of the applicability (potential adverse effects) of stream channel diversions is required. 2. Historical diversions and realignments must be discussed. 3. The topography and geology of the basin and its applicability to natural stream channel diversions must be addressed. 4. If applicable, the safety consequences of diversion and the potential for high or low water levels caused by upstream or downstream