Document: NUREG-0800
Document ID: bb1a5a83-5b12-456c-b141-1e450c066cff
Document Type: srp
Title: ONSITE METEOROLOGICAL MEASUREMENTS PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1818/ML18183A446.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.3.3
CFR Part: 
CFR Title: 

Content:
terns and spatial variations of atmospheric stability. Occasionally the unique dispersion characteristics of a particular site may also warrant the use of special meteorological instrumentation and/or studies. At sites located in remote or harsh environments (such as extreme cold/hot, or wet/dry regions), equipment and operating considerations should be taken into account (such as equipment specifications; frequency of maintenance and calibration activities; protective measures to ensure functionality of equipment; approaches for data transmission, recording, and surveillance frequency; methods for atmospheric stability determination) to ensure the capture of valid and useful data. In extreme cold environments, consideration should also be given in determining appropriate measurement heights that take into account the range of meteorological conditions, including the variation and persistence of surface-based temperature inversions over the course of the year. 2. Meteorological Data The annual (representing one or more continuous 12-month cycles) joint frequency distributions of wind direction and wind speed by atmospheric stability that are reviewed in SRP Section 2.3.2 are also evaluated in this SRP section to ensure they contain sufficient detail to permit the staff to make an independent determination of the atmospheric dispersion and deposition conditions. . The formats of the joint frequency distributions and hourly data are reviewed to ensure that they will be usable by the staff to review the atmospheric dispersion and deposition analyses performed in SRP sections 2.3.4 and 2.3.5. The formats in RG 1.23 are used for comparison. If a site has a high occurrence of low wind speeds (for example, the wind speed is less than 2 meters per second the majority of the time), a finer wind speed category breakdown should be used for the lower speeds so data are not clustered in a few categories. "Calm" wind conditions (defined as wind speeds less than the starting speed