1. NAME AND TITLE

UNIMUG3: Solves Multigroup Diffusion Equations in One-Dimensional Systems.

AUXILIARY ROUTINE

MC2TPE: Processes the MC**2 output tape for preparing the microscopic cross section library.

2. CONTRIBUTOR

Instituto de Estudos Avancados-CTA, Sao Jose dos Campos - SP Brazil.

3. CODING LANGUAGE AND COMPUTER

Fortran 4; CDC CYBER 170.

4. NATURE OF PROBLEM SOLVED

UNIMUG3 determines the multiplication factor, fluxes, and adjoint fluxes. It permits variation of the volume of any one of the regions for determining the critical state and performs the adjoint flux calculation and critical size search.

5. METHOD OF SOLUTION

UNIMUG3 solves multigroup diffusion equations in one-dimensional geometries.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

RSIC has done no studies of typical running times for UNIMUG3.

8. COMPUTER HARDWARE REQUIREMENTS

UNIMUG3 is operable on the CDC CYBER 170.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran 4 compiler is required.

10. REFERENCES

R. Kesavan Nair, "UNIMUG - A Program for the Solution of Multigroup Diffusion Equations in One-Dimensional Systems," EAV/NT 003/80 (ORNL-tr-5033) (April 1980).

H. G. Alcantara and M. A. P. Rosa, "Alteracoes No Codigo UNIMUG," EAV/R1/001/ENU/83 (1983).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and one (1.2MB) DOS diskette which contains the source code plus sample problem input and output.

12. DATE OF ABSTRACT

November 1984.