Document: NUREG-0800
Document ID: dc7fdaed-8abd-4b49-b5df-dcf64a9b93b0
Document Type: srp
Title: SHORT-TERM DISPERSION ESTIMATES FOR ACCIDENTAL ATMOSPHERIC
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070235.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.3.4
CFR Part: 
CFR Title: 

Content:
RELEASES REVIEW RESPONSIBILITIES Primary - Accident Evaluation Branch (AEB) Emergency Preparedness and Radiation Protection Branch (PERB)1 Secondary - None I. AREAS OF REVIEW Information for a construction permit (CP), operating license (OL), combined license (COL), or early site permit review is presented by the applicant and reviewed by the staff concerning 2 atmospheric dispersion estimates for postulated accidental releases of effluents to the atmosphere. The review covers the following specific areas: 1. Atmospheric transport and diffusion models to calculate relative concentrations for postulated accidental radioactive and hazardous airborne releases. 2. Meteorological data summaries used as input to diffusion models. 3. Derivation of diffusion parameters. 4. Probability distributions of relative concentrations. 5. Determination of relative concentrations used for assessment of consequences of postulated radioactive atmospheric releases for design basis accidents and for other accidents, and of onsite and offsite hazardous airborne releases. DRAFT Rev. 2 - April 1996 2.3.4-2 For a design certification review, the probability distributions should be in the site parameter envelope specified for the standardized design.3 Review Interfaces4 The Civil Engineering and Geosciences Branch (ECGB), under SRP Section 2.3.6 (proposed), reviews the adequacy of the site parameter envelope specified in standard design certification applications.5 II. ACCEPTANCE CRITERIA The applicant should provide conservative estimates of atmospheric transport and diffusion conditions at appropriate distances from the source for postulated accidental releases of radioactive and hazardous materials to the atmosphere. The plant should be considered as both a source and a receptor. The information is necessary to demonstrate compliance with the following regulations: 1. 10 CFR Part 50, Appendix A, General Design Criterion 19 (GDC 19), "Control Room," 6 with respect to the meteorological