Document: NUREG-0800
Document ID: a10a3c35-4db9-4a81-a9a5-1b4fface972a
Document Type: srp
Title: CHANNEL DIVERSIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070255.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.9
CFR Part: 
CFR Title: 

Content:
icability to natural stream channel diversions must be addressed. 4. If applicable, the safety consequences of diversion and the potential for high or low water levels caused by upstream or downstream diversion adversely to affect safety-related facilities, water supply, or ultimate heat sink must be addressed. Regulatory Guide 1.27 provides guidance on acceptable criteria for ultimate heat sinks. Technical Rationale4 The technical rationale for application of the above acceptance criteria to the review of a hydrologic description of a nuclear power plant site is discussed in the following paragraphs:5 1. Compliance with GDC 2 requires that nuclear power plant structures, systems, and components important to safety be designed to withstand the effects of natural phenomena such as earthquake, tornado, hurricane, flood, tsunami, and seiche without loss of capability to perform their safety functions. The GDC further specifies that the design bases for these structures, systems, and components shall reflect the following: a. Appropriate consideration of the most severe of the natural phenomena that have been historically reported for the site and surrounding area, with sufficient margin for the limited accuracy, quantity, and time period in which the historical data have been accumulated; 2.4.9-3 DRAFT Rev. 3 - April 1996 b. Appropriate combinations of the effects of normal and accident conditions with those of the natural phenomena; and c. The importance of the safety functions to be performed. Channel diversion has the potential for causing flooding or low surface water level at certain nuclear power plant sites, thus adversely affecting sources of water required for cooling the proposed plant. Accordingly, GDC 2 requirements are imposed to ensure that components and structures associated with the ultimate heat sink will continue to function, thereby keeping the plant in a safe condition. Meeting the requirements of this criterion provides a level of assurance that