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:
nsible for the review of cooling water systems and the Licensing Project Manager (LPM) should be informed if the independently estimated supply appears to be less than 30 days. The applicant should be asked to determine whether sufficient personnel and equipment can safely be made 2.4.11-11 Revision 3 - March 2007 available to switch water supply sources in the event of an accident. If emergency procedures are required to obtain the use of alternate water supplies, the applicant's water supply sources and procedures should be reviewed with the organization responsible for the review of cooling water systems and the LPM to determine that there is continuity of water supply. The time period for which a highly dependable water supply would be available should be compared with the time required to obtain water from an alternative supply, and the natural or accident environmental conditions which could prevail. For long-term water supply capability, different sources and means of obtaining water may be required because of the limited capability of a “short-term” supply. In those cases where different sources are necessary to ensure the long-term plant heat removal capability, the alternative sources and the means of supplying water from the sources to the plant should be identified. Any plant design provisions necessary for such situations should also be described or a reference provided to other SAR sections for the descriptions. Emergency means for obtaining long-term water supplies should be judged on the basis of the time required to obtain such supplies, natural or accident phenomena likely to prevail or to have caused the need for such supplies, and the dependability of the supply itself. The ability of the ultimate heat sink to provide the plant with cooling water below the design maximum temperature should be evaluated. The design maximum temperature and the heat load of the design basis accident, as specified in Regulatory Guide 1.27, should be provided by