By United States. Dept. of Energy. Yucca Mountain Project Office.; United States. Dept. of Energy.; United States. Dept. of Energy. Office of Scientific and Technical Information
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Extra info for Actinide-Only Burnup Credit for PWR Spent Nuclear Fuel Packages
The addition of large thermal neutron absorption cross section isotopes, such as Gd-155, in significant concentrations integral with the UO, fuel matrix, can also result in hardening of the neutron spectrum relative to pure UO, systems of comparable initial enrichment. Therefore, the U0,-gadolinium critical experiments are included in the set of critical experiments to account for the effects that may arise because of neutron spectrum hardening in UO, systems. The two U0,-Gadolinium experiments are included in the reference set of benchmark experiments to provide criticality analysis method validation data for applications where significant absorbers are assumed present integral to the fuel matrix.
Therefore, because of the relatively high burnup and enrichment, it was decided to use the Yankee Rowe measurement data from a selected number of rods from the assembly which had been cycled in Cores I, U,and IV for this isotopic validation. Kn addition, Yankee Core design is significantly different from the typical PWR. Therefore, data from fuel assemblies exposed to a non-typical spectrum is included in the benchmark set. The complete description of spent fuel samples and calculational models is provided in Reference 2-9.
2 Average Lethargy for Absorption (ALA). Used to assess relative energy specua for each critical configuration. 3 Mixed-Oxide Fresh Fuel Critical Experiments Spent fuel contains many actinides and fission products that are not present in fresh fuel. In addition to the U-235 and U-238 isotopes present in spent fuel, the set of burnup credit isotopes considered in this topical report includes other actinide isotopes that are important in the neutronics modeling of spent fuel systems. Important actinide isotopes include the fissile isotopes Pu-239 and Pu-241, and major neutron absorbing isotopes such as Ru-240.
Actinide-Only Burnup Credit for PWR Spent Nuclear Fuel Packages by United States. Dept. of Energy. Yucca Mountain Project Office.; United States. Dept. of Energy.; United States. Dept. of Energy. Office of Scientific and Technical Information