NEA-0953 TRANSHEX.

TRANSHEX, 2-D Thermal Neutron Flux Distribution from EpiThermal Flux in Hexagonal Geometry

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM 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 AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: TRANSHEX.

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2. COMPUTERS

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Program name	Package id	Status	Status date
TRANSHEX	NEA-0953/01	Tested	23-MAR-1994

Machines used:

Package ID	Orig. computer	Test computer
NEA-0953/01	UNIVAC 1108	DEC VAX 6000

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3. DESCRIPTION OF PROGRAM OR FUNCTION

TRANSHEX is a multigroup integral transport program that determines the thermal scalar flux distribution arising from a known epithermal flux in two- dimensional hexagonal geometry.

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4. METHOD OF SOLUTION

The program solves the isotropic collision pro- bability equations for a region-averaged scalar flux by an iterative method. Either a successive over-relaxation or an inner-outer iteration technique is applied. Flat flux collision probabilities between trigonal space regions with white boundary condition are utilized. The effect of epithermal flux is taken into consideration as a slowing-down source that is calculated for a given spatial distribution and 1/E energy dependence of the epithermal flux.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

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6. TYPICAL RUNNING TIME:

NEA-0953/01

NEA-DB ran the test case included in this package on a DEC VAX-6000 computer in 9 seconds of CPU time.

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7. UNUSUAL FEATURES OF THE PROGRAM:

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8. RELATED AND AUXILIARY PROGRAMS:

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9. STATUS

Package ID	Status date	Status
NEA-0953/01	23-MAR-1994	Tested at NEADB

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10. REFERENCES:

NEA-0953/01, included references:

- E. Patrakka:
  TRANSHEX - A Two-Dimensional Multigroup Collision Probability
  Computer Program for Hexagonal Geometry.
  N.E.L., Report 3  (June 1983)

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11. MACHINE REQUIREMENTS:

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0953/01	FORTRAN-V (UNIVAC)

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

NEA-0953/01

VAX/VMS V5.5-2.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

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15. NAME AND ESTABLISHMENT OF AUTHORS

     E. Patrakka
     Nuclear Engineering Laboratory
     Technical Research Centre
     Otaniemi, Finland

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16. MATERIAL AVAILABLE

NEA-0953/01

File name	File description	Records
NEA0953_01.001	Information file	51
NEA0953_01.002	JCL and control information	8
NEA0953_01.003	TRANSHEX FORTRAN 77 source program	2317
NEA0953_01.004	Sample problem input (by NEA-DB)	136
NEA0953_01.005	TRANSHEX FORTRAN original source program	2404
NEA0953_01.006	Original sample problem input (from report)	109
NEA0953_01.007	Sample problem output	1135

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17. CATEGORIES

C. Static Design Studies

Keywords: epithermal neutrons, flux distribution, hexagonal configuration, multigroup, neutron transport equation, thermal neutrons, transport theory, two-dimensional.