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:
in the control room during plant operation. d. Instrumentation Surveillance The inspection, maintenance, and calibration procedures and their frequency are evaluated. These surveillance procedures and the frequency of attention that the instrumentation systems receive are compared to operating experience at this site and other sites with similar instrumentation with the objective of determining that acceptable data recovery with acceptable accuracy will be obtained throughout the duration of the meteorological program. Criteria for acceptable accuracy and acceptable data recovery are specified in Regulatory Guide 1.23, Positions C.4 and C.5. e. Data Acquisition and Reduction The procedures, including both hardware and software, for data acquisition and reduction are evaluated. Since there are many methods of acquiring data from meteorological measurement systems which are acceptable to the staff, the review procedure varies. The basic components of the program which are reviewed to ascertain the acceptability 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, and 2.3.3-4 Rev. 2 - July 1981 (4) averaging time of system outputs for final disposition and accuracy of these 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. 10). 2. Meteorological Data Summaries Annual (i.e., representing the annual cycle) joint frequency distributions of wind direction and wind speed by atmospheric