Document: NUREG-0800
Document ID: 4e1c316a-99c2-4fd3-9d9b-323791bd85f8
Document Type: srp
Title: SHORT-TERM ATMOSPHERIC DISPERSION ESTIMATES FOR ACCIDENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730398.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.3.4
CFR Part: 
CFR Title: 

Content:
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 short 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 reviewer verifies that adequately conservative atmospheric dispersion models, with adequate onsite meteorological data as input to the models, have been used to calculate χ/Q values at appropriate distances and directions from postulated release points during design-basis radiological and hazardous material releases. If adequate onsite meteorological data are not available for the CP review, the reviewer should ensure that adequate conservatism has been applied to the calculated relative concentrations for accidental airborne effluent releases based on available data. The applicant's atmospheric dispersion models used to evaluate design-basis accident releases are compared to the general Gaussian models contained in (1) Regulatory Guide 1.145 for radiological releases to the EAB and LPZ, (2) Regulatory Guide 1.194 for radiological releases to the control room, and (3) Regulatory Guide 1.78 for airborne hazardous material releases to the control room. Use of the PAVAN computer code (Ref. 17) is an acceptable approach for implementing the dispersion algorithms discussed in Regulatory Guide 1.145 for evaluating the consequences of airborne radiological releases to the EAB and LPZ. Use of the ARCON96 computer code (Ref. 18) is an