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:
uctures, and other resources. The degree of impact will depend on the distance between the nuclear and industrial sites, the hours per year of plume interaction, the type and concentration of chemical reaction products, the area of chemical fallout, and the local atmospheric conditions. The hazards for transportation routes from plume drift resulting from station operation should be evaluated. The evaluation should include estimates of frequency of occurrence of station-induced effects and their impact on transportation, electrical transmission, vegetation, and other activities and functions. The percent drift loss from recirculating condenser cooling water, particle size distribution, salt deposition rate, local atmospheric conditions, and loss of sensitive terrestrial biota affected by salt deposition from cooling tower drift should be considered. The potential loss of important terrestrial species and other resources should be considered. The hazards to public health, structures, and other resources from potential interaction between cooling tower plumes and emissions from nearby industrial facilities should be considered. If a potential impact is judged to be significant, the site selection should provide a basis for evaluating mitigation measures or alternative heat-transfer system designs, predicting and assessing the following: • length and frequency of elevated plumes; • frequency and extent of ground-level fogging and icing in the site vicinity; • solids deposition (e.g., drift deposition) in the site vicinity; • cloud formation, cloud shadowing, and additional precipitation; DG-4034, Page 31 • interaction of the vapor plume with existing pollutant sources located within 2 kilometers (1.24 miles) of the plant; and • ground-level humidity increase in the site vicinity. If the natural vegetation or crops near the site are vulnerable to damage from airborne salt particles, a cooling system designed with special consideration for reducing drift may