1. NAME AND TITLE

REST: Fission Product Inventory Code System with Fission Product Escape Model.

AUXILIARY ROUTINES

REST 1: Fission Product Activity and Decay Rate CalculationFission/Without Escape.

REST 2: Fission Product Activity and Decay Rate CalculationFission and Fission Product n-gamma Activation/Without Escape.

REST 3: Fission Product Activity and Decay Rate CalculationFission Product Escape Model.

2. CONTRIBUTOR

Karlsruhe Nuclear Research Center (GFK), Karlsruhe, Federal Republic of Germany.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV; IBM 360/370.

4. NATURE OF PROBLEM SOLVED

The REST series was designed for the calculation of the fission product decay heat source within a nuclear reactor. A BWR is used as a model for the calculations.

5. METHOD OF SOLUTION

Numerical techniques are used throughout a series of calculational steps: the time intervals for the desired steps of equal reactor power; the fission rate integrated over each time step corresponding to the thermal reactor power input; equation coefficients are determined (REST 2 uses a matrixREST 3 calculates along the isobars) and used for the activity and decay energy calculations, etc., until the inventory is complete.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

The following running times were noted while testing REST on the IBM 360/91:

REST 1 4.27 seconds

REST 2 10.02 seconds

REST 3 7.65 seconds

8. COMPUTER HARDWARE REQUIREMENTS

REST is operable on the IBM 360/370 computers. Maximum core used on the IBM 360/91, 462 K.

9. COMPUTER SOFTWARE REQUIREMENTS

A FORTRAN H compiler is required. Plotting options require provision of routines which are not in the current package.

10. REFERENCE

E. Waibel, "REST: Program for Calculating the Fission Product Activity and Decay Rate after Variable Reactor History in Two Coupled Systems, Taking into Account Fission Product Escape," KFK 1579, ORNL-tr-271 (April 1972).

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

October 1975.