1. NAME AND TITLE

PICFEE: Fission Product Inventory Code System.

2. CONTRIBUTOR

Nuclear Research Center, Fontenay-aux-Roses, France, through the OECD NEA Computer Programme Library, Ispra (Varese), Italy.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV and Assembler language; IBM 360/50/65/91.

4. NATURE OF PROBLEM SOLVED

PICFEE calculates any quantity, such as fission product formation, which is proportioned to the fission rate in the period following irradiation of ²³⁵U, ²³⁸U, and Pu fuels. Irradiation levels are defined by a succession of linear power diagrams. The quantity considered is integrated over the power history.

5. METHOD OF SOLUTION

The nuclide composition equations and irradiation levels are solved by piece-wise integration with logarithmic interpolation. PREPIC permits the preparation of fission product data from the results of PEPIN-LE-BREF.

6. RESTRICTIONS OR LIMITATIONS

The problem should be limited to 100 irradiation stages and 30 decay-cooling periods.

7. TYPICAL RUNNING TIME

For 30 levels, 4 test points and 3 nuclides, 10 seconds of IBM 360/50 time are needed (execution time only).

8. COMPUTER HARDWARE REQUIREMENTS

The code is operable on the IBM 360/50/65/91 computers.

9. COMPUTER SOFTWARE REQUIREMENTS

Standard FORTRAN IV compilers may be used.

10. REFERENCE

B. Barre, "Program for the Integration of Elementary Fission Curves with Consideration of the Development of Fissile Nuclides," CEA-N-1203 (ORNL-tr-2527) (October 1969).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

December 1974; updated April 1975.