Document: NUREG-0800
Document ID: 31337ac3-66c6-42b1-b9e0-1655cad200d1
Document Type: srp
Title: ONSITE METEOROLOGICAL MEASUREMENTS PROGRAMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070232.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.3.3
CFR Part: 
CFR Title: 

Content:
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. DRAFT Rev. 3 - April 1996 2.3.3-8 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.28 "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 (kT) between the vent height and the 10-meter level are used for vent and penetration releases. Winds from near release height and kT 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 ensure that the data are reasonable. References 8 through 11 are information sources that are used during the review. For standard design certification reviews under 10 CFR Part 52, the procedures above should be followed, as modified by the procedures in SRP Section 14.3 (proposed), to verify that the design set forth in the standard safety analysis report, including