Document Details

Some Techniques for Estimating the Results of the Emission of Radioactive Effluent from ORNL Stacks
Subject Terms:
ORNL, stack, emission, MPC; effluent, log-polar isopleths; radioactive, perimeters
Document Location:
DOE INFORMATION CENTER 1 Way, Oak Ridge, TN 37831; Eva Butler; Phone: 865-241-4780; Toll-Free: 800-382-6938, Option 6; FAX: 865-574-3521; Email:
Document Categories:
Health, Safety and Environment\Environmental Effects
Document Type:
Declassification Status:
Never classified
Document Pages:
Accession Number:
Document Number(s):
Originating Research Org.:
Atomic Energy Commission
OpenNet Entry Date:
1998 Sep 01
This document concerns some techniques for estimating the results of the emission of radioactive effluent from ORNL stacks. There are five stacks at the Oak Ridge National Laboratory which from time to time emit small quantities of radioactive material to the atmosphere. The method most generally used to estimate the permissible rate of release from a single, isolated stack involves the computation of the ground-level atmospheric concentrations produced at each point downwind as a result of a constant unit rate of release from the stack. A common variation to this approach is to require that the average concentration over some specific period of time shall not exceed MPC. Both of these procedures fail to take into consideration the time variation of the meteorological conditions and the activity release rate. This has usually been handled by choosing a "most typical" or a "pessimistic" set of meteorological conditions, assuming that the release rate is random about a mean unit value, and calculating a sort of expected average concentration. The use of log-polar plots, calculation of the time-integrated concentration used for accidental releases, an estimation of radiation doses following an accidental release, assumptions used in the analysis, and comparison with measured values are also discussed. Tables and figures are included.

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