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NESC0663 COMRADEX4

COMRADEX-4, Doses from Radioactive Release, Meteorological Dispersion, Aerosol

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1. NAME OR DESIGNATION OF PROGRAM:  COMRADEX4
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2. COMPUTERS
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Program name Package id Status Status date
COMRADEX-4 NESC0663/01 Tested 01-JUN-1980

Machines used:

Package ID Orig. computer Test computer
NESC0663/01 IBM 3033 IBM 3033
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3. DESCRIPTION OF PROBLEM OR FUNCTION

COMRADEX4 was developed to evaluate potential radiological doses in the near (<10**4 meters) environment of radioactive releases, especially postulated accident  releases. Consequence-mitigating natural phenomena and engineered safety features, such as aerosol deposition inside and outside containment, meteorological dispersion, multiple containments, filtration, and shielding, may be calculated. Potential doses to body organs may be calculated from sources retained in containment,  distributed in the atmosphere, and inhaled.
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4. METHOD OF SOLUTION

The code must be supplied with an initial radioisotope inventory, leakage and cleanup rates for each level of  containment, and dose rate factors for each isotope and organ. The containment inventory model contains up to four shells with leakage, aerosol cleanup, and filtration factors, as well as radioactive decay. Inventory equations both inside and outside containment are solved using a numerical method for quasi-linear equations. The meteorological dispersion is calculated from an anisotropic Gaussian cloud using Briggs' values for dispersion coefficients. Gravitational settling and dry deposition may be included for each of three isotope classes. A virtual point source release is employed. The gravitation model applies settling to both actual and  image sources. Dry deposition is accounted for by uniform source depletion. Alternately, meteorological dispersion may be calculated  from input attenuation factors. In both approaches, the weather conditions may be changed three times. Doses from retained sources are calculated from uniform spherical volume sources using input removal coefficient, buildup factor, and shielding factor at a singl energy. The standard breathing rates for inhalation doses are built-in. The external beta and gamma cloud doses are calculated from analytical formulas for semi-infinite clouds. For modelled meteorology, the external gamma cloud dose may be calculated from the anisotropic Gaussian cloud. A numerical integration is used. Doses may be calculated separately for two groups if isotopes, such  as fuel nd fission products. Dose sources may be saved on auxiliary  storage and used for subsequent dose-only calculations.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of

   150 entries per class in leakage and fallout rate tables
     5 release times
    20 detector locations
     3 isotope classes
     4 containment levels
   500 isotopes
    12 organ dose rate factors per isotope
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6. TYPICAL RUNNING TIME

Thirty seconds plus 2 seconds per anisotropic Gaussian cloud gamma dose calculation per detector location per release time are required.
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7. UNUSUAL FEATURES OF THE PROGRAM

COMRADEX4 handles four containment levels; time-, chamber-, and isotopic class-dependent cleanup rates; chamber- and isotopic class-dependent leakage filter efficiencies and startup times; three changes of the meteorological model; and isotopic class-dependent gravitational settling and dry deposition.
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8. RELATED AND AUXILIARY PROGRAMS

The initial inventory of radioactive isotopes may be obtained from RIBD2 (reference HEDL- TME-75-26). An input table of time versus leakage and fallout rates  may be obtained from the HAA3B program (NESC Abstract 443).
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9. STATUS
Package ID Status date Status
NESC0663/01 01-JUN-1980 Tested at NEADB
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10. REFERENCES
NESC0663/01, included references:
- J.M. Otter and  D.K. Chung:
  Description of the COMRADEX-IV Code
  N707TI130047 (September 28, 1977).
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11. MACHINE REQUIREMENTS

300K bytes of memory are required. Two logical units are used as input and output (units 5 and 6), and two additional units may be needed. Use of several other units is optional.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0663/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  OS/370 VS2 Release 1.7.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
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15. NAME AND ESTABLISHMENT OF AUTHOR

                 J. Otter
                 Atomics International Division
                 Rockwell International
                 8900 DeSoto Avenue
                 Canoga Park, California  91305
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16. MATERIAL AVAILABLE
NESC0663/01
File name File description Records
NESC0663_01.001 INFORMATION 5
NESC0663_01.002 SOURCE (F4) 1662
NESC0663_01.003 S. P. INPUT DATA 75
NESC0663_01.004 S. P. OUTPUT 2744
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis
  • R. Environmental and Earth Sciences

Keywords: LMFBR reactors, accidents, containment, doses, meteorology, radioactivity.