CCC-0372: ACT-ARA, Time-Dependent Radiation Source Terms

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CCC-0372 ACT-ARA. (Abstract last modified 11-MAR-1993)

ACT-ARA, Time-Dependent Radiation Source Terms

Abstract Table of Contents:

OPERATING SYSTEM

OTHER RESTRICTIONS

1. NAME OR DESIGNATION OF PROGRAM - ACT-ARA.

2. COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -

To request or retrieve programs click on the one of the active versions below. A password and special authorization is required.

Explanation of the status codes.

Program-name Package-ID Status ACT-ARA CCC-0372/01 Tested

Machines used: Package-ID Orig.Computer Test Computer CCC-0372/01 CRAY X-MP CRAY Y-MP

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.

4. METHOD OF SOLUTION - 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.

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.

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.

7. UNUSUAL FEATURES OF THE PROGRAM -

8. RELATED AND 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.

9. STATUS
CCC-0372/01: 11-MAR-1993 Tested at NEADB

10. REFERENCES  -
CCC-0372/01:
- S.W. Woolfolk:
  ACT: A Program for calculation of the Changes in Radiological
  Source Terms with Time.
  WIPP/DOE-85-201  (August 12, 1985)

11. MACHINE REQUIREMENTS - Tested on a CRAY-XMP/2.

12. PROGRAMMING LANGUAGE(S) USED -
CCC-0372/01: FORTRAN-77

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED - CRAY CTSS operating system, FORTRAN 77 compiler, CFT.

CCC-0372/01:

UNICOS rel.6.1.6 with FORTRAN-77 compiler CFT77.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS -

15. NAME AND ESTABLISHMENT OF AUTHORS -
      Developed by:   S.W. Woolfolk
                      Applied Research Associates, Inc.
                      Albuquerque, New Mexico, U. S. A.
      Contributed by: Radiation Shielding Information Center
                      Oak Ridge National Laboratory
                      Oak Ridge, Tennessee, U. S. A.

16. MATERIAL AVAILABLE -
CCC-0372/01:
CCC0372_01.001    Information file                                   44 records
CCC0372_01.002    JCL                                                10 records
CCC0372_01.003    RACT FORTRAN source                                71 records
CCC0372_01.004    CACT FORTRAN source                               811 records
CCC0372_01.005    DACT data file                                      8 records
CCC0372_01.006    IS30 input data file                              269 records
CCC0372_01.007    IS50 input data file                              156 records
CCC0372_01.008    IS60 input data file                              183 records
CCC0372_01.009    IS90 input data file                              518 records
CCC0372_01.010    IS106 input data file                             233 records
CCC0372_01.011    CACT output (file TAPE40)                          42 records

17. CATEGORIES -

- G. Radiological Safety, Hazard and Accident Analysis

Keywords: DAUGHTER PRODUCTS, ISOTOPE PRODUCTION, ISOTOPES, RADIOACTIVE DECAY, RADIOACTIVE RELEASE, RADIOISOTOPES, TIME DEPENDENCE

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