Document: NUREG-0800
Document ID: b82533b2-f9f2-45b2-bbed-bdbb41b07adb
Document Type: srp
Title: REGIONAL CLIMATOLOGY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340567.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.3.1
CFR Part: 
CFR Title: 

Content:
ith respect to information on tornadoes that could generate missiles, and (3) 10 CFR Part 100, K100.10(c) (Ref. 3), with respect to the consideration that has been given to the regional meteorological characteristics of the site. The information should be presented and substantiated in accordance with acceptable practice and data as promulgated by the National Oceanic and Atmospheric Administration (NOAA), industry standards, and regulatory guides. Regulatory positions and specific criteria necessary to meet the Commission's regulations identified above are as follows: 1. The description of the general climate of the region should be based on standard climatic summaries compiled by NOAA (Ref. 4, 5). Consideration of the relationships between regional synoptic-scale atmospheric processes and local (site) meteorological conditions should be based on appropriate meteorological data (Ref. 5, 6). 2. Data on severe weather phenomena should be based on standard meteorological records from nearby representative National Weather Service (NWS), military or other stations recognized as standard installations which have long periods on record. The applicability of these data to represent site condi- tions during the expected period of reactor operation must be substantiated (Ref. 5, 6, 7). 3. Design basis tornado parameters should be based on Regulatory Guide 1.76 (Ref. 8). 4. Operating basis wind-velocity (fastest mile of wind) should be based on the standard published by the American National Standards Institute (ANSI) (Ref. 9) with suitable corrections for local conditions (Ref. 10). 2.3.1-2 Rev. 2 - July 1981 5. The ultimate heat sink meteorological data, as stated in Regulatory Guide 1.27 (Ref. 11) 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. High air pollution potential information should be based on U.S. Environ- mental Protection Agency (EPA) studies