Open Access
ND 2007
Article Number 185
Number of page(s) 4
Section Evaluated files, methods and processing
Published online 17 June 2008
International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07253

A nuclear data library production system for advanced lattice codes

A. Hébert

École Polytechnique de Montréal, P.O. Box 6079 Station "Centre-Ville'', Montréal Qc. H3C 3A7, Canada

Published online: 21 May 2008

A nuclear data library production system has been written to recover and format nuclear data required in the recently released advanced lattice code DRAGON Version4. State-of-theart resonance self-shielding calculations require information that goes beyond WIMS-D type models. Dilution-dependent cross sections are required for all resonant reactions and for more than 10 specific dilutions. Ultra-fine multigroup cross section data is also required in the resolved energy domain. Another important aspect of advanced lattice codes is the explicit treatment of most neutron induced reactions in the burnup calculation. We need to perform power normalization due to energy from various neutron induced and decay reactions. Eventhough the decay energy contributes very little relative to the neutron induced reactions, the information will be very useful for post irradiation behavior of fuel. All this information is collected using DRAGR, a new post-processing module in NJOY99, and formatted in a single direct access hierarchical database. Burnup data is also recovered and the short-life isotopic data is automatically lumped. Moreover, PyNjoy, an object-oriented script, was developed to automate the revovery of ENDF/B evaluations, the building, and the management of the database. This system was developed under the Lesser General Public License and is openly available.

© CEA 2008