Document: NUREG-0800
Document ID: bb1a5a83-5b12-456c-b141-1e450c066cff
Document Type: srp
Title: ONSITE METEOROLOGICAL MEASUREMENTS PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1818/ML18183A446.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.3.3
CFR Part: 
CFR Title: 

Content:
difference between two levels, ambient air temperature, precipitation (rainfall and liquid equivalent of frozen precipitation), and any other parameters used by the applicant to determine atmospheric stability (or turbulence) for the purposes of atmospheric dispersion and deposition modeling. For those sites that rely on water evaporation as part of their normal heat sink (such as cooling towers, cooling lakes and ponds, or spray ponds), the pre-operational monitoring program should include atmospheric moisture measurements. Except for passive plants utilizing a passive containment cooling system, sites that rely on water evaporation as part of their ultimate heat sink (such as a mechanical draft cooling tower, a cooling lake with a submerged pond, or spray ponds), both the pre-operational monitoring program and the operational monitoring program should include atmospheric moisture measurements. A site visit by staff to review the applicant’s onsite meteorological measurements program is encouraged. This may be done in coordination with the environmental- related review. The scope of the site visit should include reviewing the siting of the meteorological tower(s), local exposure of instruments, identification of the types of sensors and data recorders installed and their corresponding performance specifications; inspection, calibration, maintenance, corrective action, and data handling procedures; and associated records. 2.3.3-10 Draft Revision 4 – September 2018 a. Instrument Siting Instrument types, heights, and locations are compared generally to the positions stated in RG 1.23. Additional information is provided in American National Standards Institute/American Nuclear Society (ANSI/ANS)-3.11-2015 (Reference 7). Detailed review procedures follow. (1) Local Exposure of Instruments The local exposure of the wind and temperature sensors is reviewed to ensure that the measurements represent the general site area. A determination is made as to whether the tower