NEA-1401 ZZ-BUC/BENCHMARK.

1. NAME OR DESIGNATION OF PROGRAM:  ZZ-BUC-1/BENCHMARK.

3. DESCRIPTION OF PROGRAM OR FUNCTION

The NEACRP benchmark specification for Burnup Credit Criticality Calculations aims at verifying whether simple models can be used to evaluate the criticality safety margin for spent fuel systems.
Phases I and I-A concern a simple PWR spent fuel cell and aims at a  preliminary survey of burnup credit where burnup, cooling time and fission products are taken as parameters.
Phase I-B aims at predicting the isotopic composition of the spent fuel and compare it against chemical assay data and results from different computer codes.
Phase II-A investigates the effect of an axial burnup profile as compared to a flat on (for in infinite fuel pin array).
Phase III-A investigates the burnup credit effect in a BWR. The assumption is irradiated to achieve a batch average exposure of 40 MWd/kg under a moderator void fraction of 70%. Distributions ar considered uniform.

4. METHOD OF SOLUTION:

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

6. TYPICAL RUNNING TIME:

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES:

- M.D. DeHart, M.C. Brady and C.V. Parks
OECD/NEA Burnup Credit Calculational Criticality Benchmark Phase 1-B Results
NEA/NSC/DOC(96)-06, ORNL-6901 (June 1996)
- M. Takano and H. Okuno:
  OECD/NEA Burnup Credit Criticality Benchmark - Result of Phase-IIA
  NEA/NSC/DOC(96)01, JAERI-Research 96-003 (February 1996)
- Y. Naito, H. Okuno and Y. Ando:
  Problem Specification for Burnup Credit Benchmark Phase IIIA:
  Criticality Calculations of BWR Spent Fuel in Storage and
  Transportation
  NEA/NSC/DOC(96)-4 (December 1995)

11. MACHINE REQUIREMENTS:

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

Y. Naito, Makoto Takano, H. Okuno
Fuel Safety Division
Japan Atomic Research Institute
Tokai-mura, Naka-gun
IBARAKI-KEN 319-11
Japan

Michaele C. Brady
Sandia National Laboratory
Division 6643
P.O. Box 5800
ALBUQUERQUE, NM 87185, U.S.A.

Alain Santamarina
C.E.N. Cadarache, Bat. 20
F-13108 St. Paul-lez-Durance Cedex

File name	File description	Records
NEA1401_02.001	Information File	38
NEA1401_02.002	Burnup Credit Isotope Prediction Phase I-B .	224

File name	File description	Records
NEA1401_04.001	This information file	35
NEA1401_04.002	Atomic Densities for Phase IIA BUC Benchmark	830

File name	File description	Records
NEA1401_05.001	This Information File	39
NEA1401_05.002	Atomic Densities for Phase IIIA BUC Benchm.	690