Calculation of depletion sensitivity coefficient based on first-order generalized perturbation theory

A code for calculating the depletion sensitivity coefficient of atomic densities is developed on the basis of a first-order generalized perturbation theory. The sensitivity coefficient of atomic density of ²⁴⁴Cm at 50 GWd/T due to the change of cross section is analyzed, and the results show that the sensitivities to the fission cross section of ²³⁵U and ²³⁹Pu and the capture cross section of ²³⁸U, ²⁴⁰Pu, ²⁴¹Pu, ²⁴²Pu and ²⁴³Am are large; the energy dependent sensitivity of ²⁴⁴Cm to the capture of ²⁴³Am in thermal and resonance regions is much larger than that in the fast region, therefore, the accuracy improvement in the thermal and resonance regions should take a higher-priority than that in the fast region.