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
CFR Part: 
CFR Title: 

Content:
e effluent. ` Examine precipitation data for considerations of the effects of washout on estimates of atmospheric transport, diffusion, and deposition. (5) Evaluate estimates of relative concentration (including consideration of radioactive decay during transport and depletion of radioiodines and particulates) and relative deposition (including the effects of wet deposition) used by the applicant for assessing the individual doses resulting from routine releases of radioactive effluent to the atmosphere to verify that these estimates are complete and appropriate to local conditions. Depending on the level of confidence in the applicant’s model and considering the extent, applicability, and representative nature of the available meteorological data, the reviewer may make an independent analysis of relative concentration and relative deposition values at each receptor using the transport and dispersion models described in Regulatory Guide 1.111. Meteorological Input to Population-Dose Assessment When evaluating meteorological input to population dose assessment, the reviewer should take the following steps: (1) Verify that the release point characteristics are the same as those used for input to the individual dose assessments. October 1999 2.7-11 NUREG-1555 (2) Compare the atmospheric transport and diffusion models used by the applicant for calculations of relative concentration and relative deposition with transport and diffusion modeling concepts (as described in Regulatory Guide 1.111) applicable to regional (i.e., out to a distance of 80 km from the site) modeling. ` Give special consideration to topographic and meteorological characteristics (narrow, deep valleys, land sea [lake] breeze regimes, restricted mixing heights, fumigation conditions, and low-level subsidence inversions of temperature) to ensure that they are applicable to the type and mode of releases from the plant. ` Examine the atmospheric transport and diffusion parameters for applicability to