last modified: 11-MAR-1993 | catalog | categories | new | search |

CCC-0372 ACT-ARA.

ACT-ARA, Time-Dependent Radiation Source Terms

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1. NAME OR DESIGNATION OF PROGRAM

ACT-ARA

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2. COMPUTERS
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Program name Package id Status Status date
ACT-ARA CCC-0372/01 Tested 11-MAR-1993

Machines used:

Package ID Orig. computer Test computer
CCC-0372/01 CRAY X-MP CRAY Y-MP
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3. DESCRIPTION OF PROGRAM OR FUNCTION

The program calculates the source term activity as a function of time for parent isotopes as well as daughters. Also, at each time, the "probable release" is produced. Finally, the program determines the time integrated probable release for each isotope over the time period of interest.

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4. METHODS

The ACT-ARA program modifies an initial source term for changes with time due to decay of parents and production of daughters. The calculated activity for each daughter is based on the activity of the chain's parent. Time steps are distributed uniformly on a base 10 logarithmic scale. Decay constants, half-lives, specific activities, identified daughter products and their rate of production are maintained in data files IS30, IS50, IS60, IS90, and IS106. The probable release of the activity is calculated at each time interval based on the fraction released and the probability of intrusion. The fraction released is a step function which changes from an initial release fraction to a final release fraction at a specified time. The probability of release is non-zero following a period of active control and is modelled by a "Wisconsin Regression" function. The integrated probable release for each isotope is obtained by summation of the probable release over the total time.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The probability of intrusion is modelled by a "Wisconsin Regression" function that is assumed to be able to fit the projected probability data.

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6. TYPICAL RUNNING TIME

Large runs with 500 iterations require approximately 12 s.

CCC-0372/01
NEA-DB compiled the programs and executed the test case on a Cray YMP-EL computer. CPU times were less than one second.
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8. RELATED OR AUXILIARY PROGRAMS

RACT: Interactive Input Generation Program.
DATA LIBRARIES - IS30; IS50; 1S60; IS90; and IS106: Isotopic decay data for isotopes with atomic numbers 1-30, 31-50, 51-60, 61-90, and 91-106, respectively.

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9. STATUS
Package ID Status date Status
CCC-0372/01 11-MAR-1993 Tested at NEADB
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10. REFERENCES
CCC-0372/01, included references:
- S.W. Woolfolk:
  ACT: A Program for calculation of the Changes in Radiological
  Source Terms with Time.
  WIPP/DOE-85-201  (August 12, 1985)
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11. HARDWARE REQUIREMENTS

Tested on a CRAY-XMP/2.

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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
CCC-0372/01 FORTRAN-77
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13. SOFTWARE REQUIREMENTS

CRAY CTSS operating system, FORTRAN 77 compiler, CFT.

CCC-0372/01
UNICOS rel.6.1.6 with FORTRAN-77 compiler CFT77.
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15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

 

Developed by:   S.W. Woolfolk
                Applied Research Associates, Inc.
                Albuquerque, New Mexico, U. S. A.

 

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16. MATERIAL AVAILABLE
CCC-0372/01
File name File description Records
CCC0372_01.001 Information file 44
CCC0372_01.002 JCL 10
CCC0372_01.003 RACT FORTRAN source 71
CCC0372_01.004 CACT FORTRAN source 811
CCC0372_01.005 DACT data file 8
CCC0372_01.006 IS30 input data file 269
CCC0372_01.007 IS50 input data file 156
CCC0372_01.008 IS60 input data file 183
CCC0372_01.009 IS90 input data file 518
CCC0372_01.010 IS106 input data file 233
CCC0372_01.011 CACT output (file TAPE40) 42
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: daughter products, isotope production, isotopes, radioactive decay, radioactive release, radioisotopes, time dependence.