Document: NUREG-0800
Document ID: 0b3174a2-1530-473d-8cf7-024c17b62e52
Document Type: srp
Title: LONG-TERM ATMOSPHERIC DISPERSION ESTIMATES FOR ROUTINE RELEASES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730713.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.3.5
CFR Part: 
CFR Title: 

Content:
09 presents criteria to be used for identifying specific locations of potential receptors of interest. Regulatory Guide 1.111 presents criteria for characterizing atmospheric dispersion and deposition conditions for evaluating the consequences of routine releases. Regulatory Guide 1.112 presents criteria for identifying release points and release characteristics. Specifically, for CP, OL, COL, or ESP reviews, the following information should be provided by the applicant in the safety analysis report (SAR): 1. A detailed description of the atmospheric dispersion and deposition models used by the applicant to calculate annual average concentrations in air and amount of material deposited as a result of routine releases of radioactive materials to the atmosphere. The models should be sufficiently documented and substantiated to allow a review of their accuracy and validity, source configuration, suitability of input parameters, topography, and appropriateness for the site, plant, and release characteristics. 2. A discussion of atmospheric diffusion parameters, such as vertical plume spread (σz) as a function of distance, topography, and atmospheric conditions. Use of these parameters should be substantiated as to their appropriateness for use in estimating the consequences of routine releases from the site boundary to a radius of 50 miles (80 kilometers) from the plant. 3. Meteorological data summaries (onsite and regional) used as input to the dispersion and deposition models. Data used for this evaluation should represent hourly average values of wind speed, wind direction, and atmospheric stability which are appropriate for 2.3.5-4 Revision 3 - March 2007 each mode of release and which are characteristic of annual average atmospheric dispersion and deposition conditions in the vicinity of the plant. Guidance on appropriate onsite meteorological data is provided in Regulatory Guide 1.23. This information is also reviewed under SRP section 2.3.3. 4. Points of routine