1. NAME AND TITLE

ADENA: Code System for Application of Adjusted Data in Calculating Fission-Product Decay Energies and Spectra.

2. CONTRIBUTOR

Los Alamos National Laboratory, Los Alamos, New Mexico.

3. CODING LANGUAGE AND COMPUTER

Fortran V (P00190C000000) or Fortran IV (P00190I303300); CDC 7600 (P00190C000000) or IBM 3033 (P00190I303300).

4. NATURE OF PROBLEM SOLVED

ADENA calculates fission-product beta- and gamma-ray decay energies and spectra in 19 or fewer energy groups from a mixture of ²³⁵U and ²³⁹Pu fuels at user specified cooling times. It can be used for a wide variety of reactor operational and safety related computations where aggregate fission-product decay spectra are needed. A correction for neutron absorption in the fission products is included.

5. METHOD OF SOLUTION

ADENA uses aggregate, adjusted data derived from a combination of several experiments and summation results based on the ENDF/B-V fission-product file. The calculation method is approximate and comparisons are made to experimental measurements, to the ANSI/ANS 5.1-1979 standard, and to other calculational methods.

6. RESTRICTIONS OR LIMITATIONS

ADENA allows a maximum of 50 times steps per run. The energy bounds must be a subset of the 19-group structure specified in the ADENA report (LA-9362-MS). The plotting option has been dummied out in the IBM version.

7. TYPICAL RUNNING TIME

ADENA requires less than 30 sec. of CPU time per time step on the CDC 7600 computer. The sample problem, version (I3033), used .812 cpu seconds on the IBM 3033 computer.

8. COMPUTER HARDWARE REQUIREMENTS

Version (C0000) was designed for the CDC computer. Version (I3033) was modified by RSIC and is operable on the IBM 3033 computer.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran V (C0000) or Fortran IV (I3033) compiler is required. The DISSPLA graphics library is necessary for the plotting option.

10. REFERENCES

a. Included in the documentation:

D. C. George, R. J. LaBauve, and T. R. England, "Application of Adjusted Data in Calculating Fission-Product Decay Energies and Spectra," LA-9362-MS (June 1982).

b. Background information:

D. C. George, R. J. LaBauve, T. R. England, "Calculating Fission-Product Decay Energies and Spectra using Adjusted Data," LA-UR 82-94 (June 1982).

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

February 1983; revised October 1983, April 1984, August 1984.