NEA-0239 RIBOT-5.

1. NAME OR DESIGNATION OF PROGRAM:  RIBOT-5.

3. NATURE OF PHYSICAL PROBLEM SOLVED

Same as RIBOT

Calculation of burn-up dependent nuclear constants for pressurized or boiling water reactors in zero dimensional model. Four neutron groups are used. Microscopic constants are fitted from  SOFOCATE and MUFT. Disadvantage factors are calculated with Amouyal-Benoist method. Cluster factors have been fitted by a series of PDQ. The constants have been carefully calibrated by comparison with experiments (enriched UO2, UO2-PUO2, UO2-THO2 lattices in H2O).  An extra thermal group has been included (between .2 eV and .625 eV) - it is particularly suitable when Pu or burnable poisons are present.

4. METHOD OF SOLUTION

Same as RIBOT

Extensive use of the fitting method has been made in order to decrease the calculation time and the computer memory. The extensive comparison with experiments ensures a good precision of the results. Standard error of the eigenvalues (80 experiments) is .7 per cent delta - k.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Same as RIBOT

Use should be limited in the range of lattices where an effec- tive comparison with experiments has been made - 1 < VM/VU < 4, 1 <       Enrichment of U-235 in percent < 6, 0 <
Enrichment of Pu in per cent < l, .4 cm < r-zero < .8 cm.

6. TYPICAL RUNNING TIME

TYPICAL RUNNING TIME. Same as RIBOT -
On IBM 7094 - 2 sec/lattice calculations, .5 sec/time step in burnup calculations.
     On UNIVAC 1108 - a factor of 5 less.

7. UNUSUAL FEATURES OF THE PROGRAM

Same as RIBOT

Only extensive geometrical parameters are given (pellet radius, lattice pitch, nuclides densities, etc.). Keff, intensive parameters cross sections etc. and burnup are calculated by the program. Several options for burnup are given (test on Keff, test on average  of Keff over time interval, recycle option, self expansion of input, etc.).
It has been coupled with BNWL programs, QUICK and REPP, to calculate fuel cycle costs and thermal-hydraulics performances (program DAMASCUS).

8. RELATED AND AUXILIARY PROGRAMS:  RIBOT.

10. REFERENCES

- G. Buffoni, P. Loizzo, S. Lopez, M. Petrilli:
  Burn-up of Pressurized and Boiling Water Reactors
  CNEN RT/FI (67)28 (1967).
- P. Loizzo:
  RIBOT - A Physical Model for Light-Water Lattices Calculations BNWL-735 (1968).
- W.L. Purcell, R.M. Hiatt, G.L. Simmons, P. Loizzo:
  DAMASCUS, A Pcode to Survey the Design of Light Water Reactors
  (in preparation as a BNWL report).

11. MACHINE REQUIREMENTS:  Same as RIBOT -, Two tapes - input and output tapes.

13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: FORTRAN II monitor (IBM 7094).
IBM 360 OS.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

15. NAME AND ESTABLISHMENT OF AUTHOR

     G. Buffoni and S. Lopez
     CNEN Casaccia
     0060 - S. Maria di galeria, Italy

File name	File description	Records
NEA0239_01.001	INFORMATION	3
NEA0239_01.002	SOURCE PROGRAMME + INPUT DATA FOR SAMPLE CAS	3388
NEA0239_01.003	EDITED LIBRARY	750
NEA0239_01.004	OUTPUT LIST OF SAMPLE CASE	1044