Document: NRC Regulatory Guide
Document ID: 239cc7c1-f2cb-46cc-945d-8009db28aa6c
Document Type: regulatory_guide
Title: General Site Suitability Criteria for Nuclear Power Stations + HISTORY - HISTORY 12/2023 – DG-4034 , Proposed Revision 4 12/2011 – DG-4021 , Proposed Revision 3 02/1995 – DG-4004, Second Proposed Revision 2 11/1992 – DG-4003, Proposed Revision 2 (Rev. 4)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML2312/ML23123A090.pdf
Revision Date: 2023-10
Chapter: 
Section ID: RG-4.7
CFR Part: 
CFR Title: 

Content:
uality is near or exceeds standards, (2) the cooling system plume may interact with a plume from a nearby facility and form noxious or toxic substances, or (3) the auxiliary (fossil-fueled) generators are expected to operate routinely. 2.1.3 Local Fogging and Icing Local fogging and icing can result from water vapor discharged into the atmosphere from cooling towers, lakes, canals, or spray ponds. In rare occasions, mist or light snow can reach the ground downwind of the cooling towers. 2.1.3.2 Relevant Regulations • 10 CFR Part 51, “Environmental Protection Regulations for Domestic Licensing and Related Regulatory Functions” 2.1.3.3 Related Guidance • NUREG-1555, “Standard Review Plans for Environmental Reviews for Nuclear Power Plants: Environmental Standard Review Plan” 2.1.3.4 Considerations, Regulatory Experience, and Staff Position Water and water vapor released to the atmosphere from recirculating cooling systems can lead to ground fog and ice, resulting in transportation hazards and damage to electric transmission systems and vegetation. In NUREG-1555, Section 5.1.1, “The Site and Vicinity,” describes the NRC staff’s review procedures for evaluation of fogging and icing induced by a nuclear power plant, while Section 5.3.3.1, “Heat Dissipation to the Atmosphere,” addresses the physical and aesthetic impacts of cloud formation, cloud shadowing, additional precipitation, icing and fogging, and increased ground-level humidity. The hazards for transportation routes from fog or ice resulting from station operation should be evaluated. The evaluation should include estimates of the frequency of occurrence of station-induced fogging and icing and their impact on transportation, electrical transmission, vegetation, and other activities and functions. It should also address the potential increase in the number of hours of fogging or icing caused by station operation. Some sites are prone to severe fogging or icing because of local atmospheric