  Multiharmonic ac-magnetic susceptibility \ch11,\chi2,chi3, of neutron
irradiated Li-doped YBa2Cu3O7-x has revealed a nonmonotonic dependence of all
harmonics on the neutron fluence. The irradiation has a strongly depressive
influence on the intergrain connection suggesting an increase of the effective
thickness of the intergranular Josephson junction at aneutron fluence of
0.98x10$^{17}$ cm$_{-2}$. Less damaged are the intragrain properties. A
spectacular enhancement of the superconducting intragranular properties
reflected in the characteristics of all harmonics was observed at highest
fluence \Phi = 9.98x10$^{17}$ cm$_{-2}$. We assume that this effect results
from the development of a space inhomogeneous distribution with alternating
defectless and defect rich regions.
