SYMPOSIA PAPER Published: 01 January 2007

Use of CPXSD for Generation of Effective Fast Multigroup Libraries for Pressure Vessel Fluence Calculations


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.

Author Information

Alpan, F., Arzu
Oak Ridge National Laboratory, Oak Ridge, TN
Haghighat, Alireza
University of Florida, Gainesville, FL
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Developed by Committee: E10
Pages: 313–320
DOI: 10.1520/STP45459S
ISBN-EB: 978-0-8031-6242-6
ISBN-13: 978-0-8031-3412-6