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CCC-0382 RIBD-IRT.

RIBD-IRT, Isotope Buildup and Isotope Decay from Fission Source

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1. NAME OR DESIGNATION OF PROGRAM:  RIBD-IRT.
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2. COMPUTERS
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Program name Package id Status Status date
RIBD-IRT CCC-0382/01 Tested 23-JAN-1990

Machines used:

Package ID Orig. computer Test computer
CCC-0382/01 UNIVAC 1100 CDC CYBER 830
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3. DESCRIPTION OF PROBLEM OR FUNCTION

RIBD-IRT calculates isotopic concentrations resulting from two fission sources with normal down-  chain decay by beta emission and isomeric transfers and inter-chain  coupling resulting from (n,gamma) reactions. Calculations can be made to follow an irradiation history through an unlimited number of step changes of unrestricted duration and variability including shutdown periods, restarts at different power levels and/or any other level changes. In addition, the program permits to track and modify the concentration of individual elements as they decay with time following reactor shutdown. Tracking individual elements en- ables one to estimate time-dependent source terms for a hypothetical LOCA based on known or postulated fission product release mecha- nisms.
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4. METHOD OF SOLUTION

RIBD-IRT is a grid processor. It organizes the  various members described by the fission product library data into a grid with the various linkages established from chain branching data, yield data, and neutron capture cross sections with their branching ratios. Radioactive decay includes not only the simple member-to-member cascade but also the more complex forms where branching may be partiallly or completely skip one or two interven-  ing members.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:
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6. TYPICAL RUNNING TIME:
CCC-0382/01
NEA-DB ran the test cases included in this package on a CDC CYBER 830 computer. CPU times required were: 18 secs (case 1); 46 secs (case 2).
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS

ZIP converts an ASCII ENDFB/IV tape to binary form compatible with RIBD-IRT.
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9. STATUS
Package ID Status date Status
CCC-0382/01 23-JAN-1990 Tested at NEADB
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10. REFERENCES

- N.A. Lurie, D.H. Houston, J.A. Naber:
  Definition of Loss-of-Coolant Accidnet Radiation Source: Summary
  and Conclusions
  IRT 8167-004, SAND78-0091 (March 1978)
CCC-0382/01, included references:
- D.D. Thayer and N.A. Lurie:
  A User's Manual for Computer Code RIBD/IRT.
  IRT 6406-003  (January 1982)
- D.R. Marr:
  A User's Manual for Computer Code RIBD-II, A Fission Product
  Inventory Code.  HEDL-TME-75-26  (January 1975)
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11. MACHINE REQUIREMENTS:
CCC-0382/01
  174,600 (octal) words of CDC CYBER 830 main storage.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
CCC-0382/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
CCC-0382/01
  NOS2.5.1 (CDC CYBER830) with compiler FTN 4.8.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Three working files are required:
Logical Unit 29: Reads unformatted fission product library
             27: Scratch file
             28: Scratch file
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15. NAME AND ESTABLISHMENT OF AUTHOR

Contributed by:  Radiation Safety Information Computational Center
                 Oak Ridge National Laboratory
                 Oak Ridge, Tennessee, U.S.A.
Developed by:    IRT Corporation, San Diego, California
                 Sandia National Laboratories, Albuquerque, New Mexico.
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16. MATERIAL AVAILABLE
CCC-0382/01
File name File description Records
CCC0382_01.001 Information file 59
CCC0382_01.002 JCL and control information 16
CCC0382_01.003 ZIP FORTRAN source 37
CCC0382_01.004 RIBD Nuclear Data Library 4094
CCC0382_01.005 RIBD-IRT FORTRAN source 1870
CCC0382_01.006 RIBD-IRT sample problem input 1 14
CCC0382_01.007 RIBD-IRT sample problem input 2 13
CCC0382_01.008 RIBD-IRT sample problem output 1 502
CCC0382_01.009 RIBD-IRT sample problem output 2 5177
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17. CATEGORIES
  • D. Depletion, Fuel Management, Cost Analysis, and Power Plant Economics

Keywords: buildup, decay, fission products, irradiation, isotope production, loss-of-coolant accident, reactor operation.