[en] Recently some defective fuel rods and intact fuel rods were transported from the storage pool in the nuclear power plant site to the PIE facility in KAERI. The non-destructive examination, destructive examination, and chemical examination were carried out in the hot cells. Then the oxide layer thickness of clad inner surface and outer surface were examined. In this study, the oxide state and hydride structure of the intact fuel rod and the defective fuel rod are evaluated with the results of the PIE