1. NAME AND TITLE

FIPDIG: One-Dimensional Time-Dependent Fission Product Diffusion Code System.

2. CONTRIBUTOR

Atomic Energy Research Establishment, Winfrith, Dorchester, Dorset, England, through the OECD Nuclear Energy Agency's Computer Programme Library (NEA CPL), Ispra (Varese), Italy (Abstract NEA 310).

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV; IBM 360/370.

4. NATURE OF PROBLEM SOLVED

FIPDIG solves the one-dimensional, time-dependent, fission product diffusion problem in a temperature field, in slab, in cylinder, or in spherical geometry, taking one gaseous precursor into account. Transients are calculated, also.

5. METHOD OF SOLUTION

The finite difference method is used.

6. RESTRICTIONS OR LIMITATIONS

FIPDIG problems are limited to 40 mesh points, 30 evaporation boundaries and 30 time steps. Temperatures are not automatically evaluated.

7. TYPICAL RUNNING TIME

A problem with 20 mesh points, three evaporation boundaries, one transient, 29 time steps took 22.9 seconds CPU time (2.09 minutes execution time) on the IBM 360/75 computer. The packaged sample problem ran in 25 seconds on the IBM 360/75.

8. COMPUTER HARDWARE REQUIREMENTS

FIPDIG is operable on the IBM 360/370 computers using 118 K storage.

9. COMPUTER SOFTWARE REQUIREMENTS

A FORTRAN IV compiler is required.

10. REFERENCES

G. Preinreich, "Description of a Revised Version of the Computer Code FIPDIG," AEEW OECD Dragon Project Report 768 (October 1971).

G. Preinreich, "FIPDIGA One-Dimensional Time-Dependent Fission Product Diffusion Code," DP Report 565 (August 1968).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

December 1972; updated August 1975.