Document: NUREG-0800
Document ID: be033a97-be2a-4a23-91fe-52b123162b3b
Document Type: srp
Title: LOW WATER CONSIDERATIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730439.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.11
CFR Part: 
CFR Title: 

Content:
a 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; 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. Low water conditions could adversely affect 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. For applications pursuant to 10 CFR Part 52, meeting the applicable requirements of 10 CFR 52.17 and 10 CFR 52.79 that correspond to GDC 2 provides a level of assurance that the most severe hydrologic site characteristics have been identified; 2.4.11-6 Revision 3 - March 2007 whether GDC 2 is met with respect to the adequacy of the associated design bases will be evaluated pursuant to other SRP sections. 3. Compliance with GDC 44 requires that a system be provided to transfer heat from structures, systems, and components important to safety to an ultimate heat sink during normal operations, anticipated operational occurrences, and accident conditions. GDC 44 applies to this SRP section because the ultimate heat sink for the cooling water system consists of water sources that are subject to natural events, which in turn may reduce or limit the available cooling water supply. These natural events should be conservatively estimated to provide an adequate supply of cooling water from the ultimate heat sink to ensure that safety-related structures, systems, and components will be capable of performing their intended safety functions. Regulatory Guide 1.27 provides additional guidance for meeting these requirements. Meeting the requirements of GDC 44 provides assurance that the cooling water system will be