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:
uate onsite meteorological data as input to the models, have been used to calculate atmospheric dispersion and deposition factors at appropriate distances and directions from postulated release points during routine airborne releases of radioactive materials. For reviews of OL applications, these procedures are used to verify that the data and analyses remain valid and that the facility’s design specifications are consistent with these data. As applicable, reviews of OLs and COLs include a determination on whether the content of technical specifications related to long term atmospheric dispersion estimates is acceptable and whether the technical specifications reflect consideration of any identified unique conditions. These review procedures are based on the identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant’s evaluation of how the proposed alternatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. 1. Atmospheric Dispersion Models The applicant's models are compared to the general modeling criteria presented in Regulatory Guide 1.111. The models should be suitable to the topography of the site and vicinity, plant configuration, and release characteristics. Additional information for determining model suitability may be found in standard references such as "Meteorology and Atomic Energy - 1968" and “Atmospheric Science and Power Production”. The staff performs an independent evaluation of long-term dispersion characteristics. Release points, release characteristics, and specific locations of potential receptors of 2.3.5-6 Revision 3 - March 2007 interest are identified. Each release should be characterized as continuous or intermittent. Using the criteria presented in Regulatory Guide 1.111, each release is classified as completely elevated, partially elevated, or completely ground level. Turbulent mixing of the effluent into the