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:
atmospheric dispersion estimates (Ref. 7). a: For.the Preliminary Safety Analysis Report (PSAR), at least one annual cycle of onsite meteorological data should be provided at docketing. * I b. For the Final Safety Analysis Report (FSAR), at least two consecutive annual cycles, including the most recent one-year period, should be provided at docketing. Meteorological data should be presented in the form of joint frequency distributions of wind speed and wind direction by atmospheric stability class in the format described in Regulatory Guide 1.23. A listing -of each hour of the hourly-averaged parameters should be provided on magnetic tape in the format described in the Appendix to this Standard Review Plan section. Evidence of how well these data represent long-term conditions at the site should be presented. III. REVIEW PROCEDURES 1. Meteorological Instrumentation The basic meteorological parameters measured by instrumentation are reviewed and should include wind direction and wind speed at two levels, ambient air temperature difference between two levels, temperature, and atmospheric moisture (at sites where water vapor is emitted, as from cooling towers or spray ponds). a. Instrument Siting Instrument types, heights, and locations are compared generally to the position stated in Regulatory Guide 1.23, Positions C.1 and C.2. Detailed review procedures follow. 2.3.3-2 Rev. 2 - July.1981 (1) Local Exposure of Instruments The local exposure of the wind and temperature sensors is reviewed to assure that the measurements will represent the general site area. A determination is made whether the tower which supports the sensors will influence the wind or tempera- ture measurements. Professional experience and studies have shown that wind sensors should be mounted on booms such that the sensors are at least two tower widths away from an open- latticed tower. For temperature sensors, mounting booms need not be as long as those for wind sensors but must be unaffected by