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

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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

    Author Information:

    Alpan, F. Arzu
    Research and Development Associate, Oak Ridge National Laboratory, Oak Ridge, TN

    Haghighat, Alireza
    Professor and Chair of Nuclear and Radiological Engineering, University of Florida, Gainesville, FL

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP45459S