Higher Order Effects in Time-Dependent Sensitivity Problems

Sensitivity methods based on generalized perturbation theory are very valuable tools for the reactor designer in many areas of interest. In general, the first-order formulations are routinely used, and higher order effects are neglected. In the present Note, we have developed a practical approach to take into account higher order effects in time-dependent sensitivity analysis in the nuclide field for fuel-cycle-related problems, and we give examples of its use in cases of interest.