Document: NUREG-0800
Document ID: 496b5bd8-c9a2-4cf6-a703-e41c51e155ec
Document Type: srp
Title: CHANNEL MIGRATION OR DIVERSION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1819/ML18190A201.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.9
CFR Part: 
CFR Title: 

Content:
hould include the following areas, as applicable, to confirm whether channel migration or diversion is a flood-causing mechanism at a power reactor site. 1. Historical Accounts of Channel Migration or diversion: Historical reports of channel migration or diversion phenomena at or near the reactor site including evidence of cutoffs, subsidence, or tectonic uplift. In addition to historical accounts, sedimentological evidence, botanical evidence, planimetric surveys and as appropriate terrestrial photogrammetry data will be reviewed. 2. Regional Topographic and Geologic Evidence of Channel Migration: Regional topographic evidence or geologic features which suggests that channel migration or diversion may occur in the future (based on past geologic/geomorphic evidence expressed in geologic and/or topographic maps). Geomorphological evidence obtained from current and previous geomorphological studies and other floodplain studies will be reviewed. 3. Impact of Ice-induced Channel Migration or Diversion: Thermal causes of channel migration or diversion due to ice jams or ice dams, will be reviewed. These diversions may result from downstream ice blockages that may lead to flooding due to backwater effects, or they can be upstream ice blockages that can divert the channel away from the location of the service water intake structure. The review is to be coordinated with SRP Section 2.4.7 “Ice Effects.” 4. Evidence of Human-Induced Channel Diversion: The potential for channel diversion due to human-induced (anthropogenic) factors such including but not limited to land-use changes, diking, channelization, river bank armoring, or potential failure of water impoundment structures will be reviewed. If, based on an evaluation of review items (1) through (4), it is found that this flood-causing mechanism is consequential at the site, the scope of the staff’s review activities should be expanded to include the following areas. 5. Flooding of Site Due to Channel Migration or