1. NAME AND TITLE
TRANSHEX: Two-dimensional Multigroup Collision Probability Code System for Hexagonal
Technical Research Center of Finland, Nuclear Engineering Laboratory, Helsinki, Finland.
3. CODING LANGUAGE AND COMPUTER
Fortran V; UNIVAC 1108.
4. NATURE OF PROBLEM SOLVED
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.
5. METHOD OF SOLUTION
TRANSHEX solves the isotropic collision probability 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.
6. RESTRICTIONS OR LIMITATIONS
7. TYPICAL RUNNING TIME
No study has been made by RSIC of typical running times for TRANSHEX.
8. COMPUTER HARDWARE REQUIREMENTS
Organized as an overlay structure, TRANSHEX requires about 13.6 K words core memory plus
the memory required by array T on the UNIVAC 1108. If no overlay structure is used, the memory
required is about 18 K words plus the array T.
9. COMPUTER SOFTWARE REQUIREMENTS
TRANSHEX runs under the EXEC 8 operating system.
E. Patrakka, "TRANSHEX: A Two-dimensional Multigroup Collision Probability Computer
Program for Hexagonal Geometry" (June 1973).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains the source
code plus sample problem input and output.
12. DATE OF ABSTRACT
KEYWORDS: TWO-DIMENSIONS; MULTIGROUP; COLLISION PROBABILITY