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:
rmation 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 considerations used to evaluate the personnel radiation exposures inside the control room during design basis accident conditions. 2. 10 CFR Part 100, 100.11(a) with respect to the meteorological considerations used in the 7 evaluation to determine an acceptable exclusion area and low population zone. Regulatory Guides that provide information, recommendations and guidance, and in general describe a basis acceptable to the staff to implement the requirements of General Design Criterion GDC 19 and 10 CFR Part 100.11(a) include Regulatory Guides 1.5, 1.23, 1.24, 1.25, 8 9 1.77, 1.78, 1.95, and 1.145. The applicant's diffusion estimates should reasonably reflect staff positions and state-of-the-art atmospheric diffusion knowledge. Specifically for CP, OL, COL, or early site permit reviews,10 the following information is required: 1. A description of the atmospheric dispersion models used to calculate relative concentrations in air resulting from accidental releases of radioactive and hazardous gases to the atmosphere. The models should be documented in detail and substantiated within the limits of the model so that the staff can evaluate their appropriateness to site, plant, and release characteristics. 2. Meteorological data used for the evaluation (as input to the dispersion models) which represent annual cycles of hourly values of wind direction, wind speed, and atmospheric stability for each mode of accidental release. 3. A discussion of atmospheric diffusion parameters, such as lateral and vertical plume spread ( and ) as a function of distance, topography, and atmospheric conditions, y z 2.3.4-3 DRAFT Rev. 2 - April 1996 should be related to measured meteorological parameters. The methodology for establishing these relationships should be appropriate for estimating