Document: NUREG-1555
Document ID: a43fee0d-ad03-4f3c-97d8-e21705b04eac
Document Type: esrp
Title: METEOROLOGY AND AIR QUALITY
Source: NUREG-1555
Source URL: https://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1555/initial/
Revision Date: 2007-10
Chapter: 2
Section ID: 2.7
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CFR Title: 

Content:
f radioactive effluent to the atmosphere to verify that these estimates are complete and appropriate to regional conditions. These estimates should encompass all individuals living within 80 km of the facility. Depending on the level of confidence in the applicant’s model and considering the extent, applicability, and representativeness of the available meteorological data, the reviewer may independently analyze NUREG-1555 2.7-12 October 1999 relative concentration and relative deposition values for 16 directions in segments of 0.8-1.6 km (0.5-1 mi), 1.6-3.2 km (1-2 mi), 3.2-4.8 km (2-3 mi), 4.8-6.4 km (3-4 mi), 6.4-8.0 km (4-5 mi), 8.0-16 km (5-10 mi), 16-32 km (10-20 mi), 32-48 km (20-30 mi), 48-64 km (30-40 mi), and 64-80 km (40-50 mi) using the transport and diffusion models described in Regulatory Guide 1.111. Meteorological Input to Plant-Accident Assessments When analyzing meteorological input to plant accident assessments, the reviewer should take the following steps: (1) Compare the atmospheric transport and diffusion models used by the applicant for calculations of χ/Q and D/Q for accident consequence assessments to state-of-the-art transport and diffusion modeling concepts (as described in Regulatory Guide 1.145) applicable to local topographic and meteorological characteristics and to the type and mode of release appropriate to the plant. For environmental assessment purposes, nominal meteorological conditions are determined rather than the adverse conditions determined for safety assessments. (2) Examine atmospheric transport and diffusion parameters for applicability to local topographic and meteorological characteristics by considering the experimental bases for these parameters with respect to the local conditions. The release point characteristics should be the same as those used for input to the individual dose assessments. Regional and Local Air Quality Characteristics When analyzing regional and local air quality characteristics, the reviewer