1. NAME AND TITLE

GIRAFFE: General Isotope Release Analysis For Failed Elements

2. CONTRIBUTOR

Argonne National Laboratory, Argonne, Illinois.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 3033.

4. NATURE OF PROBLEM SOLVED

GIRAFFE was designed to provide parameter estimates of the nonlinear discrete measurement models that govern the transport and decay of delayed neutron precursors in a liquid metal fast breeder reactor(LMFBR).

5. METHOD OF SOLUTION

GIRAFFE incorporates the physical model for isotopic transport and decay into a systematic regression algorithm that enables the user to determine the values of the transport and release parameters. The code also computes the values of several descriptive statistics that provide additional diagnostic information for interpreting the delayed neutron signals and characterizing the condition of breach.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

The sample problem took only a few seconds on the Data General MV 4000 under the AOS/VS operating system.

8. COMPUTER HARDWARE REQUIREMENTS

The code was originally developed for the IBM 3033 computer. It can also run on the Data General MV family.

9. COMPUTER SOFTWARE REQUIREMENTS

The code was written in Fortran IV under the IBM VM/CMS operating system.

10. REFERENCES

Kenny C. Gross. Theory and Use of GIRAFFE for Analysis of Decay Characteristics of Delayed Neutron Precursors in an LMFBR, ANL-80-55, Argonne National Laboratory, Argonne, Illinois, July 1980.

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one DS/DD (360 K) 5.25 inch diskette.

12. DATE OF ABSTRACT

March 1991.