1. NAME AND TITLE

LIONS: Calculation of Fission Product Inventory, Gamma-Ray Dose Rates and Gamma-Ray Doses by Kernel Integration.

2. CONTRIBUTOR

Tennessee Valley Authority, Knoxville, Tennessee.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV; IBM 360/370.

4. NATURE OF PROBLEM SOLVED

Starting with the known nuclide activities released from a nuclear reactor core, LIONS calculates the activities of each isotope, the beta-ray dose rates, the 7-group gamma-ray dose rates, the integrated beta-ray doses, and the 7-group integrated gamma-ray doses at various locations such as the containment vessel, annulus space, HEPA filter, charcoal filter, and outer atmosphere.

5. METHOD OF SOLUTION

LIONS is an analytic solution of the well-known radioactive decay equations and includes decay chains of parent to great-granddaughter. Transport and inventory changes at various locations resulting from time-dependent mechanical means such as fans or leakage are also treated analytically by piece-wise integration.

6. RESTRICTIONS OR LIMITATIONS

Presently, 170 isotopes are included in the library. Times at which calculations are made are limited to 21.

7. TYPICAL RUNNING TIME

Time is a function of the number of isotopes studied and the number of times at which calculations are required. Typical running time on the IBM 370/165 computer is 3 to 4 minutes. The sample problem took approximately 1 minute on the IBM 360/75.

8. COMPUTER HARDWARE REQUIREMENTS

LIONS is operable on the IBM 360/370 computers. It requires approximately 100 K of core storage. One disk or tape drive may be used.

9. COMPUTER SOFTWARE REQUIREMENTS

A FORTRAN IV, G or H level, compiler is required.

10. REFERENCE

L. Wang Lau, "LIONS Users Manual," TVA 244-057.

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

March 1975.