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:
ceptability of data acquisition and reduction are: (1) Accuracy of direct measurements and their precision, (2) Accuracy in conversion of direct measurement units to meteorological units, (3) Adequacy of frequency and mode (instantaneous or average) of sampling, (4) Averaging time of system outputs for final disposition and accuracy of these data, and (5) Identification and handling of suspect data. Since the instrument accuracy criteria in Regulatory Guide 1.23 refer to overall system accuracy for time-averaged values, the overall system accuracy is evaluated in addition to the component (sensor, recorder, and reduction) accuracies. The evaluation consists primarily of using statistical procedures for compound errors, based on sensor accuracy, recorder accuracy, conversion of units accuracy, and frequency and mode of sampling (Ref. 12). f. Special Considerations for Complex Terrain Sites At some sites, because of complex flow patterns in nonuniform terrain, additional wind and temperature instrumentation and more comprehensive programs may be necessary. For example, the representation of circulation for a hill-valley complex or a site near a large body of water may need additional measuring points to determine airflow patterns and spatial variations of atmospheric stability. Occasionally the unique diffusion characteristics of a particular site may also warrant the use of special meteorological instrumentation and/or studies. 2. Meteorological Data 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 are used for comparison. If a site has a high occurrence of low wind speeds, a