Full size fuels discharged from Kori-1 PWR nuclear power plant have be
en subjected to postirradiation examination. The fuels under investiga
tion were irradiated for one- to four-reactor cycles. Nondestructive e
xamination and dismantling of the fuel assemblies have been conducted
in the pool of the postirradiation examination facility (PIEF) of Kore
a Atomic Energy Research Institute. Subsequently nondestructive and de
structive examinations of fuel rods have been performed in the hot cel
ls of the PIEF. An evaluation of fuel burnup behaviors was based on th
e postirradiation examination data and the nominal design values. The
results did not show any evidence of abnormalities in the fuel integri
ty.