Document: NUREG-0800
Document ID: 5f467362-94d3-4914-8c2f-2c2332ad595c
Document Type: srp
Title: ONSITE METEOROLOGICAL MEASUREMENTS PROGRAMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340581.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.3.3
CFR Part: 
CFR Title: 

Content:
nd frequency and mode of sampling (Ref. 10). 2. Meteorological Data Summaries Annual (i.e., representing the annual cycle) joint frequency distributions of wind direction and wind speed by atmospheric stability class are evaluated for sufficient detail to permit the staff to make an independent determination of the atmospheric dispersion conditions. The format of the data (joint frequency distribution and hourly average is reviewed to ensure that it will be usable by the staff. The formats in Regulatory Guide 1.23 and in Appendix A to this Standard Review Plan section are used for comparison. "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 reasonableness. They should be in the distributions as a separate wind speed class, without directional assignment for each atmospheric stability class. Annual joint frequency distributions for each expected mode of release (i.e., ground level and elevated) are checked for appropriateness of heights of measurements of wind direction, wind speed, and atmospheric stability. Winds at the 10-meter level and the temperature difference (AT) between the vent height and the 10-meter level are used for vent and penetration releases. Winds from near release height and AT between release height and the 10-meter level are used for stack releases. | 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 assure that the data are reasonable. References 7 through 11 are information sources that are used during the review. IV. EVALUATION FINDINGS The reviewer verifies that sufficient information has been provided in accordance with the requirements of this SRP section and that the evaluation