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:
ure sensors may be mounted directly on stacks or closed towers. Mounting booms for all sensors should be oriented normal to the prevailing wind at the site. A determination is made whether the terrain at or near the base of the tower will unnaturally affect the wind or temperature measurements. Heat reflection characteristics of the surface underlying the meteorological tower (grass, soil, gravel, paving, etc.) are estimated to assure ensure that localized influences on measurements are minimal. The position, size, and materials used in the construction of the recorder shack and nearby trees are also examined for potential localized influence on the measurements. (2) General Exposure of Instruments Since the objective of the instrumentation is to provide measurements which represent the overall site meteorology without plant structure DRAFT Rev. 3 - April 1996 2.3.3-6 interference, the tower position(s) must have been selected with this general objective in mind. Examination of topographical maps, which have been modified to show finished plant grade, and a site visit along with professional judgment on airflow patterns are used to determine and evaluate the representativeness of the location(s). The plant structure layout, including structure heights, are is examined 26 for potential influence on meteorological measurements. Sensors should be located at least 10 obstruction heights away from the obstruction to minimize this influence. b. Meteorological Sensors The type and performance specifications of the sensors are evaluated. Manufacturers' specifications and analysis, and operating experience for these sensors are considered in evaluation of adequacy with respect to accuracy and the potential for acceptable data recovery. Standardized evaluations such as Reference 9 and operational experience reports contained in research papers are utilized. The suitability of the specific type of sensor for use in the environmental conditions at the site is evaluated. To this