Document: NUREG-0800
Document ID: 07d0f658-6bc5-4c2f-945b-45ffacf5d379
Document Type: srp
Title: ONSITE METEOROLOGICAL MEASUREMENTS PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600394.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.3.3
CFR Part: 
CFR Title: 

Content:
ution and hourly average) is reviewed to ensure that it will be usable by the staff. The formats in Regulatory Guide 1.23 are used for comparison. If a site has a high occurrence of low wind speeds, a finer category breakdown should be used for the lower speeds so data are not clustered in a few categories. "Calm" wind conditions (which should be defined as wind speeds less than the starting speed of the anemometer or vane, whichever is higher) are checked for 2.3.3-11 Revision 3 - March 2007 reasonableness. They should be in the distributions as a separate wind speed class, without directional assignment for each atmospheric stability class. Data quality may be checked using the NUREG-0917 or similar methodology using a computer spreadsheet. Annual joint frequency distributions for each expected mode of release (i.e., ground level and elevated) are checked for appropriateness of measurement heights for wind direction, wind speed, and atmospheric stability. Winds at the 10-meter level and the temperature difference (ΔT) between the vent height and the 10-meter level are used for vent and penetration releases. Winds from near release height and ΔT between release height and the 10-meter level are used for stack releases. If practical, the climatic representativeness of the joint frequency distribution is checked by comparison with nearby stations which have collected reliable meteorological data over a long period of time (10-20 years). The distributions are compared with sites in similar geographical and topographical locations to ensure that the data are reasonable. References 9 through 12 are information sources that are used during the review. 3. Review Procedures Specific to 10 CFR Part 52 Application Type a. Early Site Permit Reviews Subpart A to 10 CFR Part 52 specifies the requirements and procedures applicable to the Commission’s review of an ESP application for approval of a proposed site. Information required in an ESP application includes a