1. NAME AND TITLE

TRIPOLI-2.2(84): Three-Dimensional Monte Carlo Radiation Transport Code System

AUXILIARY ROUTINE

ATLAS: Driver for Loading, Information Transfer, Management, and Execution of the Code System.

DATA LIBRARIES

LINDA.UK.NEUTRON Cross Sections.

LINDA.GAMMA-RAY Cross Sections.

LINDAP.UK.NEUTRON Cross Sections.

MICROSN Criticality Calculation Cross Sections from ENDF/B-IV (pointwise data).

MICROSP Shielding Application Cross Sections from ENDF/B-IV (no upscatter).

MICROST Shielding Application Cross Sections from ENDF/B-IV (with upscatter).

[Modified versions of MICROSP and MICROST added January, 1987]

TRIPOLI-2.2(84) is a continuation of CEA Monte Carlo code development, first packaged in RSIC in 1975. Following updates in 1980, 1983, and 1984, the system is designed for greater versatility and a wider range of applications than were found in the earlier versions.

2. CONTRIBUTORS

CEA/CEN/Saclay SERMA Shielding and Reliability Laboratory(LEPF), Gif-sur-Yvette, France.

The OECD Nuclear Energy Agency Data Bank assisted in making revisions, ran test cases and made other contributions towards making the code series available.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV, Assembler language; IBM 370 and 3033. (C00272I303300)

The data libraries are in binary.

4. NATURE OF PROBLEM SOLVED

TRIPOLI-2.2(84) solves the problem of the transport of neutral particles in three-dimensional geometries. This includes problems of protection against radiation which are characterized by penetrations at medium- and long-distances from the sources and problems of reactor core neutronics which are limited to the study of small systems with the presence of fissile bodies. In the latter problems, the migration of neutrons takes place over short distances.

The code system can be used to solve a broad range of problems with the physics treated exactly. It can treat problems with multiplication of neutrons by fission, and it can treat exterior source problems. For source problems, the code system allows the study of the transport of neutrons or gamma rays in a stationary system or with time dependence.

5. METHOD OF SOLUTION

TRIPOLI-2.2(84) is a general modular code system which solves the problem of the transport of neutral particles by Monte Carlo methods.

The geometry consists of any arrangement of homogeneous volume, limited by portions of planes and quadrics. This geometry can be repetitive by relocation, rotation, or symmetry. For problems of deep penetrations, biasing techniques have been specially developed to reduce the variance within determined phase-space zones. These techniques are usable in homogeneous geometries or ones presenting strong heterogeneities (empty channels). The sources have any distribution in space, direction, and energy. The cross sections are represented either in a fine multigroup mode (250-300 groups) or primarily by point values (45,000 values in the area of resolved resonances). The particle-matter interactions accounted for are: for neutrons: (n,n'), (n,2n), elastic scattering, fission, capture, thermalization (with accounting for the frequency spectrum of the molecule or with a free gas type law); for gamma rays:pair production, Compton effect, photoelectric effect. The nuclear constants are drawn from either UKNDL or ENDF/B. Six IBM 360-generated cross-section data libraries are included (in binary) for use in shielding and criticality applications.

6. RESTRICTIONS OR LIMITATIONS

There are no limitations due to programming dimensions. Coupled neutron-photon problems cannot be treated.

TRIPOLI-2.2(84) is run under the control of ATLAS which must also be locally implemented.

The CISI TA/TB plotting package called by some modules is proprietary. Those wishing to use the plotting facilities of TRIPOLI-2.2(84) may contact the NEA Data Bank or the CEA contributors for additional information.

RTEMPS and RES are two installation-dependent assembler routines in ATLAS which return the remaining time and the I/O left for the job. These must be replaced with the corresponding routine for the implementing installation. A procedure for carrying out the replacement and a small module which checks the corrections of these routines are included.

7. TYPICAL RUNNING TIME

No study has been made by RSIC of typical running times for TRIPOLI-2.2(84).

8. COMPUTER HARDWARE REQUIREMENTS

The code is operable on the IBM 3033 computer.

9. COMPUTER SOFTWARE REQUIREMENTS

A FORTRAN H extended (IFEAAB) and ASSEMBLER-H compilers are LASdrred. RSIC used Assembler F and Fortran H Extended Enhanced Compiler.

TRIPOLI-2.2(84) is run under the control of ATLAS which is included in the package. ATLAS, which must be implemented first, requires FORTRAN-H extended (IFEAAB), ASSEMBLER-H (IEV90), and PL/I OPT (IELOAA) compilers. The documentation contains information on how to proceed if the above compilers are not available.

The IEBUPDTE utility is essential.

10. REFERENCES

S. N. Cramer and R. W. Roussin, "Comments on the English Version of the TRIPOLI 2 Manual," (Informal Notes).

J. Gonnord and E. Sartori, "TRIPOLI 2.1 Package," (Informal Notes).

J. Gonnord, "ATLAS Driver for the TRIPOLI-LINDA-PROMETHEE-(NJOY-IBM) SYSTEMS," SERMA Report/S/No.492 (November 1981) (Translated by S. N. Cramer, NEA Data Bank, and SERMA/LEPF (May 1982)).

A. Baur, L. Bourdet, G. DeJonghe, J. Gonnord, A. Monnier, J. C. Nimal, T. Vergnaud, "TRIPOLI 2: Three-Dimensional Polyenergetic Monte Carlo Radiation Transport Program, Vol. I and Vol. II", OLS-80-110 (1980).

A. Baur, L. Bourdet, G. DeJonghe, J. Gonnord, A. Monnier, J. C. Nimal, T. Vergnaud, "TRIPOLI II: Three-Dimensional Polyenergetic Monte Carlo Radiation Transport Program, Vol. III," OLS-80-165 (1980).

A. Baur, L. Bourdet, G. DeJonghe, J. Gonnord, A Monnier, J. C. Nimal, and T. Vergnaud (Informal Notes).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and one DC6150 tape cartridge in TAR format which contains the source code and sample problem input, plus output from the sample problem and binary data libraries.

12. DATE OF ABSTRACT

February 1982; revised February 1983, October 1983, January 1985, September 1985, January 1987.