Document: NRC Regulatory Guide
Document ID: f0baf50b-5bb7-4783-b2f9-9586e09c97e1
Document Type: regulatory_guide
Title: Preparation of Environmental Reports for Nuclear Power Stations + HISTORY - HISTORY 02/2017 – DG-4026 , Proposed Revision 3 09/2014 – Periodic Review of Revision 2 – Revise (Rev. 3)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML1611/ML16116A068.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.2
CFR Part: 
CFR Title: 

Content:
rograms for Nuclear Power Plants” (Ref. 42), for a consecutive 24-month period of data that is not older than 10 years from the date of the application (and preferably three or more years of data if available). • Summaries of onsite diurnal, monthly, and annual air temperatures and comparisons to climatic averages and extremes. • Summaries of onsite diurnal, monthly, and annual dewpoint temperatures and humidity and comparisons to climatic averages and extremes. • Summaries of onsite monthly and annual precipitation and snowfall amounts and comparisons to climatic averages and extremes. • Summaries of monthly and annual occurrences of heavy fog (i.e., visibility less than 0.4 km (0.25 mi)) and appropriate summaries of other parameters (e.g., icing) to support the description of cooling-system impacts. • Summaries of onsite monthly and annual atmospheric stability. • Annual joint frequency distributions of wind speed and wind direction by atmospheric stability class for measurement heights and wind speed classes as defined in RG 1.23. • Estimates of monthly and seasonal mixing-heights, including frequency and duration (persistence) of inversion conditions. • A description of the severe weather phenomena (e.g., hurricanes, tornadoes and waterspouts, thunderstorms, severe wind events, lightning, and hail) affecting the site and vicinity, including seasonal and annual frequencies. • Discussion of potential climate change in the vicinity of the site over the period encompassing the licensing action and impacts on relevant meteorological parameters (e.g., temperature, precipitation, and the frequency and severity of storms). This discussion should be based on assessments conducted by Federal agencies with a mandate to evaluate the effects of climate change (e.g., latest U.S. Global Change Research Program Report), but applicable regional and local studies conducted by other entities may be included. 2.7.2 Air Quality The applicant should describe the