**1. NAME AND TITLE**

SUPERDAN-PC: Calculates Dancoff Factor of Spheres, Cylinders and Slabs.

**2. CONTRIBUTOR**

Science Applications International Inc., Oak Ridge, Tennessee.

**3. CODING LANGUAGE AND COMPUTER**

Fortran 77; IBM PC.

**4. NATURE OF PROBLEM SOLVED**

SUPERDAN-PC computes the Dancoff factor which is used to determine the flux reduction in
resonance integral calculations. This personal computer version was converted from the SCA-4/SUPERDAN IBM mainframe code package.

**5. METHOD OF SOLUTION**

The Dancoff factor is calculated using three types of geometry: infinitely long cylinders, spheres
and infinite slabs. The program for cylinders includes corrections for the effect of partial shadowing
of a rod by adjacent rods and for the effect of clad surrounding rods. The effect of clad is also
considered in the slab geometry. These corrections are not available for spheres.

**6. RESTRICTIONS OR LIMITATIONS**

None noted.

**7. TYPICAL RUNNING TIME**

In the sample problem, the calculation of the Dancoff factor for infinite slabs took only a few
seconds; for the sphere, it took about 1 minute; and for the cylinder, it was about 3 minutes on an IBM
PC/XT with an 8087 math co-processor.

**8. COMPUTER HARDWARE REQUIREMENTS**

IBM PC and compatibles with or without a math co-processor.

**9. COMPUTER SOFTWARE REQUIREMENTS**

The code was written in Fortran 77 and was tested under PC-DOS (IBM PC). Executable files,
produced by the MICROSOFT's Fortran 77 compiler (version 4.01) and linker (version 3.64), are
included.

**10. REFERENCE**

J R Knight, "SUPERDAN: Computer Programs for Calculating the Dancoff Factor of Spheres,
Cylinders and Slabs," ORNL/NUREG/CSD/TM-2 (March 1978).

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced document and one (360 K) diskette including source, executables, a
sample session, and an information file.

**12. DATE OF ABSTRACT**

June 1990.

**KEYWORDS: ** MICROCOMPUTER; INTERACTIVE, ON-LINE; REACTOR PHYSICS;
DANCOFF FACTORS