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Additional resources for Sensitivity, Parametric Evals - Burnup Credit for Spent Nuclear Fuel Packages
Thus results indicate that the positive correlation between actinidesonly k" and the specific power at which depletion is calculated may be at least partially due to the spectral hardening which occurs at higher specific powers. One possible cause of such spectral hardening is the effect of fission-product poisoning. Xenon is a well-known fission-product poison during reactor operation, even though it decays away rapidly after shutdown. Xenon reaches an equilibrium state during operation that is proportionate to specific power.
5 EFFECT OF SELECTED DEPLETION PARAMETERS ON k" As was discussed with fuel history effects, fuel assemblies considered for loading in a spent fuel cask can represent a broad variety of operating conditions. In addition to specific power and operating history, parameters such as fuel and moderator temperatures and moderator boron concentrations assumed during depletion calculations are potentially important in terms of their effect on k". This section will study the sensitivity of k" to variations in each parameter to determine the most conservative approach for applying these parameters in depletion calculations.
As with the actinides-only study, cases 5 and 6 demonstrate that downtimes occurring immediately before and during the final cycle have the strongest effect on k". 76 years). After restart, 155Gd is quickly depleted. Downtimes in the last fuel cycle are more important since the inventory of 155Eu is higher. This burnout of a key fission-product absorber results in the increase in k" relative to a zero downtime case. It is important to remember that the effect of 241Pu decay is still present during the same operating histories.