  We study the effect of intra-atomic correlations on anisotropies of hopping
of 5f electrons. It is shown that they may considerably enhance these
anisotropies to the extend that electrons in some of the 5f orbitals remain
localized. This provide a microscopic basis for a previously made assumption
that some of the 5f electrons must be partially localized when Fermi surfaces
and effective masses of the component are calculated. Calculations are
performed on two- and three-sites clusters. They include phase diagrams in the
presence and absence of an external magnetic field as function of anisotropic
hopping.
