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:
ntended 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 capable of performing its intended safety functions by providing an adequate supply of cooling water to safety-related structures, systems, and components. 4. Sections 100.10(c) and 100.20(c) of 10 CFR Part 100 require that physical characteristics of a site (including seismology, meteorology, geology, and hydrology) be taken into account to determine its acceptability for a nuclear power reactor. 10 CFR Part 100 applies to this SRP section because the reviewer verifies that the applicant’s SAR contains a description of surface and subsurface hydrological characteristics of the site and region. The ultimate heat sink for the cooling water system consists of water sources affected by, among other things, site hydrological characteristics that may reduce or limit the available supply of cooling water for safety-related structures, systems, and components. Meeting the requirements of 10 CFR Part 100 provides assurance that plant structures, systems, or components important to safety are designed to withstand appropriately severe hydrologic phenomena and are capable of performing their intended safety functions. 5. Compliance with 10 CFR 100.23 requires, in part, that consideration of river blockages or diversion or of other failures that may block the flow of cooling water, tsunami runup and drawdown, and dam failures be included in the evaluation of the emergency cooling water supply. 10 CFR 100.23 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 that may reduce or limit the available supply of cooling water (i.e., the heat sink). Natural events such as river blockages or diversion or other failures that may block the flow of cooling water, tsunami runup and drawdown,