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NEA-0387 TIMOC-72. (Abstract last modified 01-DEC-1972)


TIMOC-72, 3-D Time-Dependent Homogeneous or Inhomogeneous Neutron Transport by Monte-Carlo

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Abstract Table of Contents:

NAME | COMPUTER | PROBLEM | SOLUTION | RESTRICTIONS | CPU | FEATURES | AUXILIARIES | STATUS | REFERENCES | REQUIREMENTS | LANGUAGE | OPERATING SYSTEM | OTHER RESTRICTIONS | AUTHOR | MATERIAL | CATEGORIES |

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1. NAME OR DESIGNATION OF PROGRAM - TIMOC-72.


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

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Explanation of the status codes.

Program-name         Package-ID  Status
TIMOC-72             NEA-0387/01 Tested
TIMOC-72             NEA-0387/02 Tested

Machines used:
Package-ID     Orig.Computer                       Test Computer
NEA-0387/01    UNIVAC 1106                         UNIVAC 1106
NEA-0387/02    IBM 370 series                      IBM 370 series

3. NATURE OF PHYSICAL PROBLEM SOLVED - TIMOC solves the energy and time dependent (or stationary) homogeneous or inhomogeneous neutron transport equation in three-dimensional geometries. The program can treat all commonly used scattering kernels, such as absorption, fission, isotropic and anisotropic elastic scattering, level excitation, the evaporation model, and the energy transfer matrix model, which includes (n,2n) reactions. The exchangeable geometry routines consist at present of (a) periodical multilayer slab, spherical and cylindrical lattices, (b) an elaborate three-dimensional cylindrical geometry which allows all kinds of subdivisions, (c) the very flexible O5R geometry routine which is able to describe any body combinations with surfaces of second order. The program samples the stationary or time-energy-region dependent fluxes as well as the transmission ratios between geometrical regions and the following integral quantities or eigenvalues, the leakage rate, the slowing down density, the production to source ratio, the multiplication factor based on flux and collision estimator, the mean production time, the mean destruction time, time distribution of production and destruction, the fission rates, the energy dependent absorption rates, the energy deposition due to elastic scattering for the different geometrical regions.


4. METHOD OF SOLUTION - TIMOC is a Monte Carlo program and uses several, partially optional variance reducing techniques, such as the method of expected values (weight factor), Russian roulette, the method of fractional generated neutrons, double sampling, semi-systematic sampling and the method of expected leakage probability. Within the neutron lifetime a discrete energy value is given after each collision process. The nuclear data input is however done by group averaged cross sections. The program can generate the neutron fluxes either resulting from an external source or in the form of fundamental mode distributions by a special source iteration procedure. In this latter case, the sampling of eigenvalues is based on the life cycle.


5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM -
Number of energy groups - 50
number of isotopes - 20
number of isotope mixtures - 20


6. TYPICAL RUNNING TIME -


7. UNUSUAL FEATURES OF THE PROGRAM - A special option allows the calculation of geometrical perturbation effects. In such calculations, the differential effect does not depend on the total variance of the considered quantity. The sampling of these differential effects is based on the method of similar flight paths.


8. RELATED AND AUXILIARY PROGRAMS - The program can be linked to the ENDF/B data file via the CODAC-2 program. CODAC-2 generates for any desired group structure the nuclear parameters and group averaged cross sections needed by TIMOC.


9. STATUS
NEA-0387/01: 01-JUL-1975 Tested at NEADB
NEA-0387/02: 01-DEC-1972 Tested at NEADB


10. REFERENCES  - 
NEA-0387/01:
- R. Jaarsma and H. Rief:
  TIMOC 72 Code Manual
  EUR 5016 e (1973)
- Modification of TIMOC 72
- H. Kschwendt and H. Rief:
  TIMOC - A General Purpose Monte Carlo Code for Stationary and Time
  Neutron Transport
  EUR 4519 e (1970)
- R.J. Jaarsma and H. Kschwendt:
  Geometry Routines for Use in the TIMOC Code
- Note from INGENIEROS on TIMOC-72/J2
  UNIVAC Implementation (30 May 1978)
- F.Beonio-Brocchieri and C.Daolio
CODAC 2 : A New Version of the CODAC Code Which Accepts
ENDF/B Version II Data for the Production of a Few Group Library
for TIMOC.
EUR/C-IS/816 72.e (March 1972)
- H.Krainer
CODAC, A FORTRAN IV Program to Process a TIMOC Library
From the ENDF/B File.
EUR-4512.e (1970)
NEA-0387/02:
- R. Jaarsma and H. Rief:
  TIMOC 72 Code Manual
  EUR 5016 e (1973)
- Modification of TIMOC 72
- H. Kschwendt and H. Rief:
  TIMOC - A General Purpose Monte Carlo Code for Stationary and Time
  Neutron Transport
  EUR 4519 e (1970)
- R.J. Jaarsma and H. Kschwendt:
  Geometry Routines for Use in the TIMOC Code


11. MACHINE REQUIREMENTS -


12. PROGRAMMING LANGUAGE(S) USED -
NEA-0387/01: FORTRAN-IV 
NEA-0387/02: FORTRAN+ASSEMBLER 


13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED - IBM370 O.S.


14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS -


15. NAME AND ESTABLISHMENT OF AUTHOR -
R. Jaarsma and H. Rief
J.R.C. EURATOM
Ispra Establishment, Italy.


16. MATERIAL AVAILABLE -
NEA-0387/01:
NEA0387_01.001    SOURCE PROGRAM (F4)                              4586 records
NEA0387_01.002    ASSEMBLER ROUTINE                                  49 records
NEA0387_01.003    SAMPLE PROBLEM DATA                               203 records
NEA0387_01.004    SAMPLE PROBLEM PRINTED OUTPUT                     315 records
NEA-0387/02:
NEA0387_02.001    INFORMATION                                         3 records
NEA0387_02.002    FORTRAN SOURCE PROGRAMMES (MAIN  -PACKAGE)         33 records
NEA0387_02.003    FORTRAN SOURCE PROGRAMMES (NDP   -PACKAGE)        885 records
NEA0387_02.004    FORTRAN SOURCE PROGRAMMES (RWS   -PACKAGE)       2130 records
NEA0387_02.005    FORTRAN SOURCE PROGRAMMES (GEOM  -PACKAGE)       1417 records
NEA0387_02.006    ASSEMBLER PROGRAMMES      (LOC   -PACKAGE)          8 records
NEA0387_02.007    ASSEMBLER PROGRAMMES      (RANDOM-PACKAGE)        549 records
NEA0387_02.008    INPUT DATA FOR SAMPLE PROBLEM NO.1                203 records
NEA0387_02.009    PRINTED OUTPUT OF SAMPLE PROBLEM NO.1             339 records
NEA0387_02.010    INPUT DATA FOR SAMPLE PROBLEM NO.2                184 records
NEA0387_02.011    PRINTED OUTPUT OF SAMPLE PROBLEM NO.2             720 records
NEA0387_02.012    FORTRAN SOURCE PROGRAMME OF PLOTGEOM             1054 records
NEA0387_02.013    SAMPLE PROBLEM FOR PLOTGEOM                        79 records
NEA0387_02.014    SAMPLE OUTPUT OF PLOTGEOM                         193 records
NEA0387_02.015    SPECIAL VERSIONS OF SUB. STRDIR AND NDFIS         375 records


17. CATEGORIES  - 

- F. Space
Time Kinetics, Coupled Neutronics Hydrodynamics Thermodynamics


Keywords: ABSORPTION, CYLINDERS, ELASTIC SCATTERING, FISSION, KINETICS, MONTE CARLO METHOD, NEUTRON TRANSPORT THEORY, SLABS, SPHERES, THREE-DIMENSIONAL

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