Document: NUREG-0800
Document ID: ebff6c02-bdd3-4751-9e36-9347caf05c8e
Document Type: srp
Title: and 2.4.6 are applicable to low water estimates due to the various phenomena discussed.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070258.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.5
CFR Part: 
CFR Title: 

Content:
ed 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 conservatively 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, and/or ice, and/or channel diversions that would decrease water supply 19 below minimum required levels. Technical Rationale20 The technical rationale for application of these acceptance criteria to reviewing low water considerations is discussed in the following paragraphs:21 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 criterion further specifies that the design bases for these structures, systems, and components shall reflect the following: DRAFT Rev. 3 - April 1996 2.4.11-6 a. Appropriate consideration for the most severe natural phenomena 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 the effects of the natural phenomena; and c. The importance of the safety functions to be performed. GDC 2 applies to this SRP section because the reviewer addresses natural hydrologic phenomenon that may reduce or limit the available