Abstracts and Available Papers Presented at the 2000 International RERTR Meeting
A Sophisticated Computational Method for HEU-LEU Conversion
of
the German FRJ-2 Research Reactor Using MCNP
R. NABBI, G. Thamm, J. WOLTERS
Research Center Jülich
Leo-Brandt-Straße
52425 Jülich, Germany
Abstract
Due to a more than four-year
shutdown of FRJ-2, for comprehensive inspection and refurbishment work, the
HEU-LEU conversion plan was extended beyond the original time schedule. In the
meantime a sophisticated computational method has been developed as a
requirement of the licensing authority– for reactor physics calculations, core
conversion studies and fuel element performance analysis. For this purpose, an
MCNP model in very high fidelity was developed and coupled with a depletion
code. The fuel elements, absorber arms, and the moderator zones were highly
segmented, and all core and reflector components were included.
The
results of the calculation shows that the reactivity value of each core at any
burnup step is predicted with a high accuracy (within the 2s
confidence interval). The flux and burnup distribution in all core
configurations with HEU and individual LEU fuel elements, respectively, are
also in very good agreement with the experimental results. In the case of a
single LEU fuel element, the neutron flux is approx. 5 % lower than in an HEU
fuel element resulting in an extended irradiation time in the reactor core.
Contact: Dr. Rahim Nabbi Research Center Jülich
Forschungszentrum Juelich, ZFR
Leo-Brandt-Straße
52428 Juelich, Germany
Phone: 0049-2461-615065
Fax: 0049-2461-613841
E-mail: r.nabbi@fz_juelich.de
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