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:
ion under normal and accident conditions, assuming a single failure. GDC 44 applies to SRP Section 2.4.9 because the ultimate heat sink for the power plant can consist of complex water supply sources, including necessary retaining structures (e.g., ponds or rivers with dams) and the associated canals and conduits connecting these sources with the reactor site. Any earthwork intended as part of the water conveyance system, consisting of dams and canals, for example, should be constructed in a manner that ensures the integrity of the system and its intended safety function. In addition, it should be shown that the potential diversion, migration, or realignment of natural waterways caused by severe natural phenomena cannot cause loss of the heat sink or result in flooding at the site in excess of the design basis water surface elevation. Meeting these requirements provide a level of assurance that, given the most severe natural phenomena capable of causing the potential diversion, migration, or realignment of natural waterways, an adequate and dependable source of cooling water can be maintained. 3. Sections 100.10(c) and 100.20(c) of 10 CFR Part 100 require that physical characteristics of a site (including seismology, meteorology, geology, and hydrology) be taken into account to determine the acceptability of a site for a nuclear power reactor. The diversion, migration, or realignment of natural waterways posing the potential for flooding or adversely affecting the integrity of the cooling water supply for the plant, is one of the many natural phenomena specified in 10 CFR 100.10(c) and 10 CFR 100.20(c) that should be considered in designing the plant to accommodate the characteristics of a proposed site. Meeting this requirement provides a level of assurance that the plant site is not vulnerable to flooding or to loss of cooling water that could be caused by the diversion, 2.4.9-9 Draft Revision 4 – September 2018 migration, or realignment of natural waterways