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:
is 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 Diversion: Inundation maps illustrating projected flooding levels in relation to the reactor powerblock and other structures, including those SSCs important to safety such as the service water intake structure, will be reviewed.4 Associated flooding effects on SSCs important to safety or blockage of water supply sources resulting from channel migration- or channel diversion-induced flooding (flooding not addressed by hydro-meteorological induced flooding scenarios in other SRP sections). The review performed should be consistent with the type of review performed in SRP Section 2.4.3 “Streams and Rivers.” 4 Depending on the reactor sites’ topography and geography, the powerblock and any important-to-safety intake structures may be at different elevations relative to each other. As a consequence, the staff may need to review the calculation of separate flooding elevations corresponding to these features’ locations as those elevations may vary across the reactor site owing variable site topography and the presence of multiple as-built reactor structures. The staff’s review of the analysis should include review of the consideration an evaluation of those associated effects in any water surface elevation estimate. 2.4.9-4 Draft Revision 4 – September 2018 6. Alternate Water Supply Sources: Alternate water supply sources and associated operating procedures. 7. Consideration of Other Site-Related Evaluation Criteria: The potential effects of seismic and non-seismic information on the postulated the worst-case channel migration or diversion scenario for the proposed site. 8. Additional Information for 10 CFR Part 52 Applications: Additional information may be presented dependent on the type of NRC application. For a COL application, the additional information is