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:
cts of channel migration or diversion. In addition to a flood inundation map, the staff would review applicant’s calculation of the duration of the flooding event as well as any associated effects.3 These three elements define the magnitude and extent of the PMF that might occur at a power plant site due to channel migration or diversion; the staff should review these elements consistent with the review criteria described elsewhere in this SRP. If it is determined that channel migration or diversion cannot occur at the nuclear power plant site (i.e., this flood-causing mechanism is found to be inconsequential), then the staff would review the applicant’s statement to that effect along with its supporting evidence against the review criteria described in Section ll of this SRP. 1 Section 52.1(a) defines site characteristics “… as the actual physical, environmental and demographic features of a site. Site characteristics are specified in an early site permit or in a final safety analysis report for a combined license....” 2 An inundation map delineates the area of some ground surface that would be flooded by a particular flooding event. In the case of a nuclear power plant, such a map would be expected to depict the water surface elevations of flood waters in relation to various features of the reactor powerblock including any SSCs important to safety. 3 Associated effects: Can be defined to include those factors such as wind waves and run-up effects; hydrostatic loading; hydrodynamic loading, including debris and water velocities; effects caused by sediment deposition and erosion; concurrent site conditions, including adverse weather conditions; and groundwater ingress. 2.4.9-3 Draft Revision 4 – September 2018 The scope of the staff’s review activities should 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