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NESC0824 UDAD.

UDAD, Radiation Exposure to Man at Uranium Processing Plant

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1. NAME OR DESIGNATION OF PROGRAM:  UDAD.
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2. COMPUTERS
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Program name Package id Status Status date
UDAD NESC0824/01 Tested 18-OCT-1983

Machines used:

Package ID Orig. computer Test computer
NESC0824/01 IBM 3081 IBM 3081
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3. DESCRIPTION OF PROBLEM OR FUNCTION

The Uranium Dispersion and Dosimetry (UDAD) program provides estimates of potential radiation exposure to individuals and to the general population in the vicinity of a uranium processing facility such as a uranium mine or  mill. Only transport through the air is considered. Exposure results from inhalation, external irradiation from airborne and ground- deposited activity, and ingestion of foodstuffs. Individual dose commitments, population dose commitments, and environmental dose commitments are computed. The program was developed for application  to uranium mining and milling; however, it may be applied to dispersion of any other pollutant.
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4. METHOD OF SOLUTION

The removal of radioactive particles from a contaminated area such as uranium tailings by wind action is estimated from theoretical and empirical wind-erosion equations according to the wind speed, particle size distribution, surface roughness, and other parameters. Atmospheric concentrations of radioactivity from specific sources are calculated by means of a dispersion-deposition-resuspension model. Source depletion as a result of deposition, fallout of the heavier particulates, and radioactive decay and ingrowth of radon daughters are included in a  sector-averaged, Gaussian plume dispersion model. The average air concentration at any given receptor location is assumed to be constant during each annual release period, but to increase from year to year because of resuspension. Surface contamination is estimated by including buildup from deposition, ingrowth of radio- active daughters, and removal by radioactive decay, weathering, and  other environmental processes. Deposition velocity is estimated on the basis of particle size, density, and physical and chemical environmental conditions which influence the behavior of the smaller particles.
Calculation of the inhalation dose to an individual is based on the ICRP Task Group Lung Model (TGLM). Estimates of the dose to the  bronchial epithelium of the lung from inhalation of radon and its short-lived daughters are calculated based on a dose conversion factor from the BEIR report. External radiation exposure includes radiation from airbone radionuclides and exposure to radiation from  contaminated ground. Terrestrial food pathways include vegetation, meat, milk, poultry, and eggs. Internal dosimetry is based on ICRP recommendations, with the option of using either a single or a multiple exponential retention model.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

A maximum of 80 sources may be specified. The UDAD default is 240 receptor locations corresponding to the intersections in a grid pattern of 16 wind sectors and 15 radial distances. Any set of 0-15 distances in the range 0.1 to 99.9 km. may be selected. In addition to these regular  receptors, 0-60 selected extra receptor locations may be specified as input by the user.
   A complete set of stability wind-rose data must be specified.
This consists of 576 frequency values--a combination of 6 stability  categories, 16 wind directions, and 6 wind speed classes.
For particulate pollutants, up to five particle sizes and five size distributions may be specified as input by the user.
Population data for the 240 sector-segments corresponding to the 16 wind sectors and 15 radial distances may be specified for use in  the population dose calculations.
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6. TYPICAL RUNNING TIME

The sample problem was executed in 8 minutes  on an IBM3033.
NEA-DB executed the test case on IBM 3081K in 295 CPU seconds.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
NESC0824/01 18-OCT-1983 Tested at NEADB
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10. REFERENCES

- Final Environmental Statement, Bear Creek Project, U.S. Nuclear
  Regulatory Commission, Office of Nuclear Materials Safety and
  Safeguards, Docket No. 40-8452,
  NUREG-0129, June 1977.
NESC0824/01, included references:
- C.J. Smith and W.J. Cody:
  ANL-AMD System/360 Subroutine ANL Q054S, DATE, Current Date in
  Gregorian Calendar. February 1968.
- M.H. Momeni, Y. Yuan and A.J. Zielen:
  The Uranium Dispersion and Dosimetry (UDAD) Code.
  NUREG/CR-0553, ANL/ES-72, May 1979.
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11. MACHINE REQUIREMENTS:  430K bytes of memory are used.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0824/01 FORTRAN+PL/I
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

FORTRAN IV (94%), PL/I (4%), and Assembly language (2%). The only use of PL/I is the auxiliary plotting program, CONTOUR. The only of Assembly language is the DATE, Gregorian calendar date routine.
Operating System used for test case execution: MVS-SP (IBM 3081K).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

UDAD is divided computationally into two major programs, MASTER and INTERNAL. MASTER reads the input data and calculates the atmospheric concentration, ground deposition, dose commitment, dose rate, and time-integrated dose. INTERNAL computes the conversion factors for dose commitment, dose rate, and timeintegrated dose from the inha- lation and ingestion of radioactive materials. Input data is read using NAMELIST. In addition to the standard FORTRAN print output file three other output files are used - logical unit 8 as a restart facility, 9 for isopleth plot data, and 10 for effective dispersion  factor table print data. UDAD uses the proprietary Integrated Soft-  ware Systems Corporation's (ISSCO) DISSPLA plotting system and a proprietary coutour mapping routine to produce the plot output.
Users at other sites will have to supply local counterparts.
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15. NAME AND ESTABLISHMENT OF AUTHOR

M.H. Momeni, Y. Yuan, and A.J. Zielen
Division of Environmental Impact Studies
Argonne National Laboratory
9700 South Cass Avenue
Argonne, Illinois 60439
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16. MATERIAL AVAILABLE
NESC0824/01
File name File description Records
NESC0824_01.003 UDAD INFORMATION FILE 49
NESC0824_01.004 UDAD SOURCE (FORTRAN-4) 3621
NESC0824_01.005 INHALE SOURCE (FORTRAN-4) 1002
NESC0824_01.006 ANC4 SOURCE (FORTRAN-4) 116
NESC0824_01.007 CONCPLOT SOURCE (FORTRAN-4) 203
NESC0824_01.008 CONTOUR SOURCE (PL/I) 211
NESC0824_01.009 DATE1 SOURCE (ASSEMBLER) 84
NESC0824_01.010 UDAD INPUT DATA FOR TEST CASE 200
NESC0824_01.011 UDAD TEST CASE OUTPUT ON UNIT 6 14784
NESC0824_01.012 UDAD TEST CASE OUTPUT ON UNIT 10 1137
NESC0824_01.013 UDAD JCL 46
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis
  • R. Environmental and Earth Sciences

Keywords: air pollution, dispersions, dose rates, environmental impacts, radioactivity transport, uranium.