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Multigroup (i.e., broad-group) libraries play a significant role in the accuracy of transport calculations. There are several broad-group libraries available for particular applications. For example the 47-neutron (26 fast groups), 20-gamma-group BUGLE libraries are commonly used for light water reactor shielding and pressure vessel dosimetry problems. However, there is no publicly available methodology to construct group structures for a problem and objective of interest. Therefore, we have developed the Contributon and Point-wise Cross-Section Driven (CPXSD) methodology, which constructs effective fineand broad-group structures. In this paper, we use the CPXSD methodology to construct broad-group structures for fast neutron dosimetry problems. It is demonstrated that the broad-group libraries generated from CPXSD constructed group structures, while only 14 groups (rather than 26 groups) in the fast energy range are in good agreement (̃1 %–2 %) with the fine-group library from which they were derived, in reaction rate calculations.
multigroup library, pressure vessel fluence, contributon, adjoint, cross section
Alpan, F. Arzu
Research and Development Associate, Oak Ridge National Laboratory, Oak Ridge, TN
Professor and Chair of Nuclear and Radiological Engineering, University of Florida, Gainesville, FL