last modified: 19-JUN-1986 | catalog | categories | new | search |

CCC-0387 HARAD.

HARAD, Decay Isotope Concentration from Atmospheric Noble-Gas Release

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1. NAME OR DESIGNATION OF PROGRAM:  HARAD.
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2. COMPUTERS
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Program name Package id Status Status date
HARAD CCC-0387/01 Tested 19-JUN-1986

Machines used:

Package ID Orig. computer Test computer
CCC-0387/01 IBM 360 series IBM 3084Q
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3. DESCRIPTION OF PROBLEM OR FUNCTION

HARAD calculates concentrations of radioactive daughters in air following the atmospheric release of a parent radionuclide for a variety of release heights and metereo-  logical conditions. It can be applied most profitably to the assessment of doses to man from the noble gases such as Rn-222, Rn-220, and Xe and Kr isotopes. These gases can produce significant  quantities of short-lived particulate daughters in an airborne plume, which are the major contributors to dose.

The simultaneous processes of radioactive decay, buildup and environmental loss due to wet and dry deposition on ground surfaces  are calculated for a daughter chain in an airborne plume as it is dispersed downwind from a point of release of a parent.
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4. METHOD OF SOLUTION

The code evaluates the analytic solution to the set of coupled first order differential equations describing time variation of the concentration of a chain of radionuclides. The analytic solutions assume that the coefficient describing the fractional rate of dry deposition is constant with time. To account  for the variation the time coordinate is automatically divided into  intervals and a set of average values are used.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The maximum length of decay chain is 10 nuclides; calculations can be made at a maximum of 24 downwind distances.
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6. TYPICAL RUNNING TIME

A typical HARAD calculation of the activity ratios of Rn-22 and its first five daughters at 80000 m downwind requires 0.12 seconds on an IBM 3033.
CCC-0387/01
The test case included in this package has been executed by NEA-DB on an IBM 3084Q computer in 0.13 seconds of CPU time.
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7. UNUSUAL FEATURES OF THE PROGRAM

The short run time of HARAD makes  it ideal for adaptation for use as a subroutine in computer codes designed to assess the radiological impact of atmospheric releases from nuclear facilities.
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
CCC-0387/01 19-JUN-1986 Tested at NEADB
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10. REFERENCES:
CCC-0387/01, included references:
- R. E. Moore:
  HARAD: A Computer Code for Calculating Daughter Concentrations in
  Air Following the Atmospheric Release of a Parent Radionuclide
  ORNL-5634 (May 1980).
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11. MACHINE REQUIREMENTS:
CCC-0387/01
To run the test case on an IBM 3084Q computer, 60K bytes of main storage are required.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
CCC-0387/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
CCC-0387/01
MVS-SP (IBM 3084Q).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

R.E. Moore
Health and Safety Research Division
Oak Ridge National Laboratory
Oak Ridge, Tennessee 37830, U.S.A.
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16. MATERIAL AVAILABLE
CCC-0387/01
File name File description Records
CCC0387_01.001 Information File 55
CCC0387_01.002 HARAD source (FORTRAN IV) 285
CCC0387_01.003 JCL to run sample problem 60
CCC0387_01.004 Sample Problem Input 12
CCC0387_01.005 Sample Problem printed output 132
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: radioactive clouds, radioactive decay, radioactive release, radioisotopes, radionuclide migration.