NEA-0897 FISP-6.

1. NAME OR DESIGNATION OF PROGRAM:  FISP-6.

3. DESCRIPTION OF PROGRAM OR FUNCTION

FISP-6 calculates fission product inventory and energy release rates in irradiated fuel using  a point model for irradiation and cooling conditions specified by the user. Its basic data requirements of fission yields, radioactive half-lives, average decay energies, beta and gamma spectra, and capture cross sections are held in permanent data library files.

4. METHOD OF SOLUTION

FISP-6 uses an analytical solution with linearised build-up and decay chains of the fission products. Using  a particular form of the general solution the code is able to reduce the problems of rounding errors which occur with this type of calculation.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The present version  of FISP-6 allows for a maximum of 96 decay chains each having up to  20 members (including capture products), and a maximum of 650 linearized decay routes. Cross sections are limited to a maximum of  3 groups for each nuclide while a coarse gamma spectrum may have up  to 12 groups.

6. TYPICAL RUNNING TIME

Running time depends on the nature of the problem to be solved and the used options. The FISP-6 documentation  lists typical running times for a wide range of available options.

NEA-DB executed the test cases included in this package on an IBM 3090 computer. The following execution times were required: 1s14 (case 1); 1s31 (case 2).

7. UNUSUAL FEATURES OF THE PROGRAM

In addition to performing the standard decay heat summation calculations, FISP-6 is a valuable tool for analysing decay heat predictions in terms of contributions  from individual nuclides, mass chains, or chemical species. Detailed beta and gamma-ray spectra (the latter broadened to match detector response) may be output in either tabular or graphical form. The results of inventory calculations may be stored and retrieved.

8. RELATED AND AUXILIARY PROGRAMS

FISP-6 supersedes FISP-5, but retains many features introduced in that version.

10. REFERENCES:

- A. Tobias:
  FISP6 - An Enhanced Code for the Evaluation of Fission Product
  Inventories and Decay Heat.
  TPRD/B/0097/N82  (June 1982)

11. MACHINE REQUIREMENTS:
- main storage: 990K bytes
- system clock.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  OS MVS.

MVS/XA (IBM 3090).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

The following system routines are required by FISP-6: DECIN, CLOCK,  ERRSAV, ERRSET, ERRSTR, PLOT, RECT, SYMBOL, NUMBER, LINE, INTERP. Note: some of these subroutines come from the CEGB Plotting Package.

15. NAME AND ESTABLISHMENT OF AUTHORS

          A. Tobias
          Central Electricity Generating Board
          Technology Planning and Research Division
          Berkeley Nuclear Laboratories
          Berkeley
          Gloucestershire GL13 9PB
          UNITED KINGDOM

File name	File description	Records
NEA0897_03.001	Information file	105
NEA0897_03.002	FISP-6 source program	3587
NEA0897_03.003	RISLEY subroutines (FORTRAN)	1780
NEA0897_03.004	RISLEY subroutines (ASSEMBLER)	614
NEA0897_03.005	Dummy graphic routines	12
NEA0897_03.006	Library converter (for main library)	69
NEA0897_03.007	Library converter (for gamma and beta)	28
NEA0897_03.008	JCL to compile, link and run FISP-6	279
NEA0897_03.009	Input data for test case 1	124
NEA0897_03.010	Input data for test case 2	128
NEA0897_03.011	Gamma-beta library based on UKFPDD2	15546
NEA0897_03.012	Main data library used in testing	1731
NEA0897_03.013	Main data library based on UKFPDD2	14805
NEA0897_03.014	Main data library based on JEF1	14560
NEA0897_03.015	Output for test case 1	822
NEA0897_03.016	Output for test case 2	860