CCC-0582 NITRAN.

NITRAN, Neutron Transport Code System Based on Anisotropic Scattering

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHODS, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, FEATURES, RELATED OR AUXILIARY PROGRAMS, STATUS, REFERENCES, HARDWARE REQUIREMENTS, LANGUAGE, SOFTWARE REQUIREMENTS, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: NITRAN

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2. COMPUTERS

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Program name	Package id	Status	Status date
NITRAN	CCC-0582/01	Arrived	08-JAN-2002

Machines used:

Package ID	Orig. computer	Test computer
CCC-0582/01	FACOM M-380

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3. DESCRIPTION OF PROGRAM OR FUNCTION

NITRAN is a neutron transport code system based on a rigorous treatment of anisotropic scattering. Double differential cross sections are used (see DLC-123/DDXLIB).

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4. METHODS

NITRAN includes DDXS, a nuclear data processing code used to generate group constants of the double differential type. The input to DDXS can be ENDF/B-IV, ENDF/B-VI or JENDL-3 cross sections.
In the NITRAN calculation, angular dependent transfer cross sections (kernels) are used as scattering cross sections. They are obtained from integrating the product of the double differential neutron emission cross sections and the angular transfer probabilities. The transport codes are based on discrete ordinates. To solve the one-dimensional (slab and sphere) transport, NITRAN-1 is used. For two dimensions, NITRAN-2 is used. For time- dependent problems NITRAN-2D is included.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM: None noted.

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6. TYPICAL RUNNING TIME: None noted.

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7. UNUSUAL FEATURES

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8. RELATED OR AUXILIARY PROGRAMS

AUXILIARY ROUTINES:
DDXS: Double differential cross section generation program.
NITRAN-1: One-dimensional transport code for spherical and slab geometries
NITRAN-2: Two-dimensional transport for slab (x-y) geometry
NITRAN-TD: One-dimensional transport code for spherical geometry for time dependent problems.

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9. STATUS

Package ID	Status date	Status
CCC-0582/01	08-JAN-2002	Masterfiled Arrived

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10. REFERENCES:

CCC-0582/01, included references:

- F.Maekawa;
"NITRAN Manual,"
OKTAVIAN Report A-90-01 (March 1990)
- A.Takahashi, D.Rusch;
"Fast Rigorous Numerical Method for the Solution of the
Anisotropic Neutron Transport Problem and the NITRAN
System for Fusion Neutronics Application, Part II,
"KfK 2832/II, KFK (October 1979).

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11. HARDWARE REQUIREMENTS

NITRAN will run on the FACOM M-380. With minor modifications, the codes can be modified to run on the IBM mainframes.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
CCC-0582/01	FORTRAN-77

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13. SOFTWARE REQUIREMENTS: NITRAN codes are written in FORTRAN 77.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

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15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by:
                Osaka University,
                Osaka, Japan

Developed by:
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U.S.A.

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16. MATERIAL AVAILABLE

CCC-0582/01

Files 1-47 belong to the DDXS code system.
(Files 1-10 comprise the FORTRAN 77 sources for DDXS.)
Files 48-71 comprise the NITRAN-1 code system
(Files 48-53 are the FORTRAN 77 sources for NITRAN01.)
Files 72-93 comprise the NITRAN-2 code system
(Files 72-76 are the FORTRAN 77 sources for NITRAN-2)
Files 94-115 comprise the NITRAN-TD code system.

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17. CATEGORIES

F. Space - Time Kinetics, Coupled Neutronics - Hydrodynamics - Thermodynamics

Keywords: discrete ordinate method, kernels, multigroup, neutron, one-dimensional, slabs, time-dependent, two-dimensional.