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:
channel diversion should be sufficient to meet safety- related water supply requirements. If ice blockage of the river or estuary is possible, it should be demonstrated that the resulting water level in the vicinity of the site has been considered in establishing the flood (e.g., from diverted channel of an ice dam) and water supply design bases (e.g., low water downstream of ice jams). If this water level could adversely affect the intake structure, or other safety-related facilities, it should be demonstrated that an alternate safety-related water supply will not also be adversely affected. 4. Flooding of Site Due to Channel Diversions: If flooding to a degree greater than that described in the PMF section is possible, potential impact forces on the safety-related intakes should be a consideration in the design bases. Also, the erosive forces and dynamic loading should be included in the structural design bases. 5. Human-Induced Causes of Channel Diversion: In addition to naturally migrating channels, the potential exists that human-induced reasons (e.g., land-use changes or the diking, channelizing, armoring, and subsequent failure of such structures) could initiate or exacerbate geomorphologic channel changes. The potential for human- induced channel diversions in the vicinity of the site is qualitatively evaluated, as it relates to channel diversions. The USACE and the NCHRP have provided methods of predicting channel migration near structures when rivers are channelized. 6. Alternate Water Sources: The staff reviews availability of alternate sources of safety- related water supply to the plant according to recommendations of Regulatory Guide 1.27. Assessment of alternate water sources and operating procedures is also addressed in SAR Section 2.4.11 (Low Water Considerations). Review of this SAR section should be coordinated with SAR Section 2.4.11. 7. Consideration of Other Site-Related Evaluation Criteria: 10 CFR Part 100 describes site-related proximity,