RSIC COMPUTER CODE PSR-057

1. NAME AND TITLE

SATURN: P₁ or Transport Corrected Multigroup Neutron Cross Section Data Processor.

2. CONTRIBUTORS

Westinghouse Astronuclear Laboratory, Pittsburgh, Pennsylvania.

NASA Marshall Space Flight Center, Huntsville, Alabama.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 360/75/91.

4. NATURE OF PROBLEM SOLVED

SATURN processes P₁ or transport corrected cross section data using a minimum amount of core storage to produce multigroup cross section data tapes in two formats for use in the ANISN-W or DOT-IIW codes. The two formats are the normal, group-dependent data tape or the specially prepared, group-independent data tape.

Options provided in the code include mixing table operations, selective transverse leakage corrections for P₁ or transport corrected cross section data, and output tape labeling or relabeling capabilities. Cross section data are input to SATURN from up to two magnetic tapes and/or cards at user option.

5. METHOD OF SOLUTION

P₁ or transport corrected cross section data are processed as group dependent data on a per set basis to produce a group independent data tape for subsequent processing. A diagonal transport correction for P₁ cross section data is calculated for use in the calculation of the diffusion coefficient required for the transverse leakage correction. Mixtures of cross section data are formed by specification of the mixture set number, component set number, and component density (or abundance). The final output from the code consists of two tapes containing the macroscopic cross section data for mixtures in a group-independent and group-dependent cross section data tape format. The group-dependent data for mixtures are obtained as output only if sufficient core memory storage is available to contain all of these data.

6. RESTRICTIONS OR LIMITATIONS

SATURN is an auxiliary code and should only be used for those situations where the DOT-IIW or ANISN-W codes cannot process the cross section data or for problems that require special, transverse leakage corrections, or group-independent tapes. Before preparing input data for SATURN, it is necessary to have complete knowledge of the problem to be analyzed, because SATURN is essentially the starting point for the entire discrete ordinates analysis.

Because SATURN uses the flexible dimensioning technique, no size restriction is imposed on any given array but the sum of the length of all data arrays is restricted by the available computer core memory. SATURN should be used only for problems requiring either transverse leakage corrections or group independent tapes.

7. TYPICAL RUNNING TIME

No study has been made by RSIC of typical running times for SATURN.

8. COMPUTER HARDWARE REQUIREMENTS

SATURN is operable on the IBM 360/75/91 computers.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCES

Reference to RSIC Data Package DLC-26/W-M-NRSM.

CAML--Program to Convert Libraries 1, 2 & 3.

M. A. Capo and R. K. Disney, "Implementation of Radiation Shielding Calculation Methods, Vol. 2," WANL-PR(LL)-040 (December 1971).

R. G. Soltesz, R. K. Disney, S. L. Zeigler, "Nuclear Rocket Shielding Methods, Modification, Updating, and Input Data Preparation," Vol. 3, WANL-PR-(LL)-034 (August 1970).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

January 1984.