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:
description of the role of synoptic-scale atmospheric processes on local (site) meteorological conditions is checked against the descriptions provided in References 8 and 9. 2. Regional Meteorological Averages and Extremes Since meteorological averages and extremes can only be obtained from stations in the region of the site which have long periods of record, and the stations are not usually very close to the site, a determination of the representativeness of the data to site conditions is the primary concern in the review. A determination of the adequacy of the stations and their data is also made. Recorded meteorological averages and extremes are checked against standard publications such as Reference 9. Snow and ice load adequacy is checked for reasonableness against ANSI A58.1-1972 and regional data available in References 8, 19 9, and 10. References 8 and 9 provide information on other averages and extremes. References 15 and 16 provide information on high air pollution potential for verification. Extreme winds and the specific vertical velocity distribution are checked against References 12 and 13. Gust factors are checked against Reference 12. The design basis tornado parameters are checked for agreement with Regulatory Guide 1.76 (Ref. 8) and 20 DRAFT Rev. 3 - April 1996 2.3.1-6 tornado data are verified using the procedures and data in WASH-1300 (Ref. 14)(Reference 17). For new applications, the design basis maximum tornado wind speed should be at least 482 km/hr (300 mph). Information regarding the use of this maximum wind speed in lieu of the guidance contained in Regulatory Guide 1.76 is documented in SECY 93-087 and its associated SRM.21 The reviewer provides the findings on meteorological parameters to the Structural Engineering Branch and other branches as necessary for review of the adequacy of the design of structures, systems, and components important to safety.22 3. Early Site Permit Reviews 10 CFR Part 52 specifies the requirements and procedures