Document: NUREG-0800
Document ID: eea126bc-3192-4a98-b937-2f09794010cd
Document Type: srp
Title: COOLING WATER SUPPLY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340556.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.11
CFR Part: 
CFR Title: 

Content:
than the probable minimum low flows and levels from the applicable sources of supply. 2. Maximum water requirements for normal operation must be presented and (if applicable) shown to be less than the water available under all likely conditions from the sources of supply. SAR Section 2.4.11.6 (Heat Sink Dependability Requirements): The required data and information are those necessary to determine that the facility meets the criteria of GDC 44 as described in Regulatory Guide 1.27. The analyses will be considered complete and acceptable if the following are adequately addressed: 1. The initial water inventory must be sufficient for shutdown and cooldown of the plant. 2. Water losses (such as seepage, drift, and evaporation) must be conserva- tively estimated, as suggested in Regulatory Guide 1.27. 3. The design basis hydrometeorology (temperature, dewpoint, etc.) must be as conservative as the criteria of the guide (see SRP Section 2.3). 4. The limit on the heat sink return water temperature must be less than the maximum allowable cooling water inlet design temperature. 5. The heat sink intakes are located such that no potential exists for blockage by littoral drift and/or sediment that would decrease water supply below minimum required levels. 2.4.11-3 Rev. 2 - July 1981 III. REVIEW PROCEDURES Minimum plant requirements (water level and flow) that are identified in SAR Sections 2.4.11.5 or 9.2.5 are compared to the estimated minimum water levels and flows given in Section 2.4.11.1. If normal operation is not-assured at the minimum water supply conditions and loss of normal operation capability can adversely affect safety-related components, estimates of warning time are reviewed to assure that shutdown or conversion to alternate water sources can be accomplished prior to the trip. For such cases, emergency operating pro- cedures are required, and are reviewed to assure that they are consistent with the postulated conditions. The-analysis'of the dependability of the