Document: NUREG-0800
Document ID: cd6f87fe-98e4-4726-8a49-7793f2f2caf1
Document Type: srp
Title: REGIONAL CLIMATOLOGY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070225.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.3.1
CFR Part: 
CFR Title: 

Content:
erican National Standards Institute (ANSI), with suitable corrections for local conditions (Ref. 13). 5. The ultimate heat sink meteorological data, as stated in Regulatory Guide 1.27, should be based on long-period regional records which represent site conditions. 6. Freezing rain estimates should be based on representative NWS station data. 7. Estimates of maximum rainfall rate should be based on representative NWS station data.12 8. High air pollution potential information should be based on U.S. Environmental Protection Agency (EPA) studies (Refs. 15, 16). 9. All other meteorological and air quality data used for safety-related plant design and operating bases should be documented and substantiated. DRAFT Rev. 3 - April 1996 2.3.1-4 Technical Rationale13 The technical rationale for application of these acceptance criteria is discussed in the following paragraphs:14 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, or seiche without loss of capability to perform their safety functions. To ensure that the nuclear plant is designed to withstand specified natural phenomena associated with the meteorology of the region in which the nuclear plant is to be sited, it is necessary to specify the most severe meteorological event that may occur as a function of frequency of occurrence. Thus, historical data must be obtained from regional observation of snow and ice load; meteorological conditions affecting the ultimate heat sink; tornado parameters; wind speed; rainfall and freezing rain; and dust, sand, and atmospheric pollution. To meet GDC 2 requirements for all meteorological phenomena, historical data is used to determine the expected frequency with which the most severe conditions occur. These data are then used to specify plant design requirements for a CP, OL, COL, or early site permit or