1. NAME AND TITLE
LIONS: Calculation of Fission Product Inventory, Gamma-Ray Dose Rates and Gamma-Ray Doses by Kernel Integration.
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.
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
KEYWORDS: ISOTOPE INVENTORY; GAMMA-RAY; ENVIRONMENTAL DOSE; AIRBORNE; BETA-RAY; NUCLIDE TRANSPORT