Computer Programs
NEA-0804 TIMS-1.
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NEA-0804 TIMS-1.

TIMS-1, MultiGroup Cross-Sections of Heavy Isotope Mixture with Resonance from ENDF/B

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1. NAME OR DESIGNATION OF PROGRAM:  TIMS-1.
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2. COMPUTERS
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Program name Package id Status Status date
TIMS-1 NEA-0804/01 Tested 28-JUN-1982
TIMS-1 NEA-0804/02 Tested 29-OCT-1984

Machines used:

Package ID Orig. computer Test computer
NEA-0804/01 IBM 3033 IBM 3033
NEA-0804/02 IBM 3033 DEC VAX 11/780
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3. DESCRIPTION OF PROBLEM OR FUNCTION

TIMS-1 is a code for calcu- lating the group constants of heavy resonant nuclei by using ENDF/ B-4 format data. This code calculates infinitely dilute cross sec- tions and self-shielding factors as a function of composition sigma-0 temperature T and R-parameter, where R is the ratio of ato-  mic number density of two different resonant nuclei.
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4. METHOD OF SOLUTION

In the unresolved resonance region, a ladder of resonance parameters and levels is generated with Monte Carlo method. The temperature dependent cross sections are calculated with the Breit-Wigner single-level and multi-level formula. The neutron spectrum is accurately calculated by solving numerically the neutron slowing down equation using a recurrence formula for neutron slowing down source.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The maximum numbers  of energy groups, temperatures and compositions are 60, 4 and 10 respectively.
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6. TYPICAL RUNNING TIME

NEA-DB executed the test case on IBM 3033 in 540 seconds.
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7. UNUSUAL FEATURES OF THE PROGRAM

The computation time depends con-  siderably on the materials to be calculated and the permissible errors to be assumed for the generated cross sections in the unre- solved region. The computation times are about 12 minutes for the production of group constants of U-238 for one temperature and 8 composition variables using FACOM 230/75.
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8. RELATED AND AUXILIARY PROGRAMS

The ENDF/B-4 or JENDL nuclear data  file is adopted as input data.
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9. STATUS
Package ID Status date Status
NEA-0804/01 28-JUN-1982 Tested at NEADB
NEA-0804/02 29-OCT-1984 Tested at NEADB
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10. REFERENCES

- H. Takano and Y. Ishiguro:
  J. Nucl. Sci. Technol 14(9), 627 (1977).
- P.H. Kier and A.A. Robba:
  ANL 7323 (1967).
NEA-0804/01, included references:
- H. Takano, Y. Ishiguro and Y. Matsui:
  TIMS-1: A Processing Code for Production of Group Constants of
  Heavy Resonant Nuclei
  JAERI 1267 (September 1980).
NEA-0804/02, included references:
- H. Takano, Y. Ishiguro and Y. Matsui:
  TIMS-1: A Processing Code for Production of Group Constants of
  Heavy Resonant Nuclei
  JAERI 1267 (September 1980).
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11. MACHINE REQUIREMENTS:  Main storage 270 kbytes on IBM 3033.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0804/01 FORTRAN+ASSEMBLER
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
OS370/033 (IBM 3033).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

          Hideki Takano, Yukio Ishiguro and Yasushi Matsui
          Division of Reactor Engineering
          JAERI
          Tokai-mura, Naka-gun
          Ibaraki-ken
          Japan
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16. MATERIAL AVAILABLE
NEA-0804/01
File name File description Records
NEA0804_01.003 TIMS-1 INFORMATION FILE 120
NEA0804_01.004 TIMS-1, SOURCE CARD IMAGES (FORTRAN-4) 5435
NEA0804_01.006 SUBROUTINES, SOURCE (FORTRAN-4) 436
NEA0804_01.007 RANDOM NUMBER GENERATOR (ASSEMBLER) 26
NEA0804_01.008 TIMS-1, OVERLAY CARDS 38
NEA0804_01.009 TIMS-1, INPUT FOR SAMPLE CASE 9
NEA0804_01.010 TIMS-1, OUTPUT OF SAMPLE CASE 1629
NEA0804_01.011 TIMS-1, JCL TO RUN SAMPLE CASE 156
NEA-0804/02
File name File description Records
NEA0804_02.003 TIMS-1 INFORMATION FILE 31
NEA0804_02.004 TIMS-1 SOURCE PROGRAM (FORTRAN-4) 5926
NEA0804_02.005 TIMS-1 TEST CASE INPUT DATA 9
NEA0804_02.006 ENDF/B-4 DATA (FORMATTED) 3909
NEA0804_02.007 JCL 3
NEA0804_02.008 TIMS-1 TEST CASE PRINTED OUTPUT 2266
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17. CATEGORIES
  • B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: Breit-Wigner formula, ENDF/B, Monte Carlo method, cross sections, group constants, resolved region, resonance absorption, resonance scattering, self-shielding, unresolved region.