Document: NUREG-1555
Document ID: d82f8007-705d-4b2b-b71e-c89f767b3572
Document Type: esrp
Title: METEOROLOGICAL MONITORING
Source: NUREG-1555
Source URL: https://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1555/initial/
Revision Date: 2007-10
Chapter: 6
Section ID: 6.4
CFR Part: 
CFR Title: 

Content:
ower. - For temperature sensors, mounting booms need not be as long as those for wind direction sensors, but the sensors must be unaffected by thermal radiation from the tower itself. - No temperature 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. (b) Determine whether the terrain at or near the base of the tower will unnaturally affect the wind or temperature measurements. ` Evaluate the heat reflection characteristics of the surface underlying the meteorological tower (grass, soil, gravel, paving, etc.) to ensure that localized influences on measurements are minimal. ` Examine the position, size, and materials used in the construction of the recorder shelter and the proximity and heights of nearby trees and structures, including exhaust stream plumes, for potential localized influence on the measurements. (2) Evaluate the general exposure of instruments as follows: (a) Verify that the tower position(s) will allow the instrumentation to provide measurements that represent the overall site meteorology without plant structure interference. (b) Determine and evaluate the representativeness of the locations, as follows: ` Examine topographic maps that have been modified to show the finished plant grade and features. ` Conduct a site visit. ` Use professional judgment on airflow patterns. (c) Examine the plant structure layout, including structure heights and potential influence on meteorological measurements, using the following guidelines: ` For no discernible influence on measurements, towers should be located at least ten obstruction heights away from major obstructions. October 1999 6.4-7 NUREG-1555 ` For towers located more than five obstruction heights from major obstructions, the influence should be minimal. ` Tower locations within five obstruction heights should be analyzed on a case-by-case basis. Meteorological Sensors The reviewer should evaluate