NEA-0804 TIMS-1.
TIMS-1, MultiGroup Cross-Sections of Heavy Isotope Mixture with Resonance from ENDF/B
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES
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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.
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.
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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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.
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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| 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).
- 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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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 |
Keywords: Breit-Wigner formula, ENDF/B, Monte Carlo method, cross sections, group constants, resolved region, resonance absorption, resonance scattering, self-shielding, unresolved region.