**1. NAME AND TITLE**

KAP-VI: Kernel Integration Code System in Complex Geometry.

**DATA LIBRARY**

W-M-NRSM: Multigroup Neutron and Gamma-Ray Cross Sections (packaged separately as DLC-26/W-M-NRSM).

KAP-VI is part of a series of code systems for shield design called ``Synthesis of Calculational Methods for the Design and Analysis of Radiation Shields for Nuclear Rocket Systems.'' This methodology is packaged by RSIC as CCC-94 through CCC-98. The computing technology in CCC-94, CCC-95, and CCC-96 are termed by the originators the ``early'' design method.

**2. CONTRIBUTORS**

Westinghouse Astronuclear Laboratory, Pittsburgh, Pennsylvania.

NASA George C. Marshall Space Flight Center, Huntsville, Alabama.

**3. CODING LANGUAGE AND COMPUTER**

FORTRAN IV; UNIVAC 1108.

**4. NATURE OF PROBLEM SOLVED**

Neutron and/or gamma radiation levels are calculated at detector points located within or outside a complex radiation source geometry describable by a combination of quadratic surfaces. A variety of options are available for describing cylindrical, spherical, disc, line, or point sources or source distributions in complex geometries. The output can be flux, dose, or heating rate.

**5. METHOD OF SOLUTION**

The point kernel method is used. The attenuation function, or kernel, for gamma rays employs exponential attenuation with a buildup factor. Three optional fast neutron attenuation functions are included: 1) a modified Albert-Welton function for calculating fast neutron dose rate using removal cross sections, 2) a bivariant polynomial expression for computing neutron spectra using infinite media moments data, and 3) a monovariant polynomial expression for computing neutron spectra using infinite media moments data.

**6. RESTRICTIONS OR LIMITATIONS**

The following limitations are noted:

maximum number of boundary surfaces: 100

maximum number of geometric regions or zones: 100

maximum number of sets of response functions: 10

**7. TYPICAL RUNNING TIME**

Estimated running time of the sample problems: 3 minutes.

**8. COMPUTER HARDWARE REQUIREMENTS**

KAP was originally designed for a 32 K IBM 7090 or 7094 and later converted to run on CDC and UNIVAC computers. The packaged KAP VI is operable on the UNIVAC 1108.

**9. COMPUTER SOFTWARE REQUIREMENTS**

KAP VI may be implemented on a FORTRAN IV compiler.

**10. REFERENCES**

RSIC Data Package DLC-26 available for use in CCC-94/KAP-VI.

R. K. Disney and S. L. Zeigler, *Nuclear Rocket Shielding Methods, Modification,
Updating, and Input Data Preparation, Vol. 6: Point Kernel Techniques*, WANL-PR-
(LL)-034 (August 1970).

M. A. Capo and R. K. Disney, *Implementation of Radiation Shielding Calculation
Methods, Vol. 2: Seminar/Workshop Notes*, WANL-PR(LL)-040 (December 1971).

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced documents and a reel of magnetic tape which contains the source code and sample problem input in BCD/EBCDIC card images; total records 5538. Output from running sample problems is printed in the documentation.

**12. DATE OF ABSTRACT**

May 1969; revised December 1984, October 1991.

**KEYWORDS: ** KERNEL; NEUTRON; GAMMA-RAY; COMPLEX
GEOMETRY; SINGLE SCATTERING