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:
, and equipment are required for assessing and monitoring offsite consequences. Meteorological parameters provide an integral part of the data needed to establish atmospheric dispersions for assessing offsite doses from airborne releases of radioactive material. 2.3.3-5 DRAFT Rev. 3 - April 1996 Meeting the requirements for measurement of meteorological parameters during an accident or anticipated operational occurrence provides assurance that those personnel responsible for managing the event will be fully informed about the potential consequences of airborne radiological releases.24 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. (1) Local Exposure of Instruments The local exposure of the wind and temperature sensors is reviewed to assure ensure that the measurements will represent the general site area. 25 A determination is made whether the tower which supports the sensors will influence the wind or temperature 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 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. A determination is made whether the terrain