[en] Spent PWR fuel assembly with a discharge burnup of 37.84 GWD/MTU, which was irradiated for 3-reactor cycles in the Kori-1 nuclear power plant(NPP) has been transported via road to the KAERI's PIE facility. In-pool nondestructive examination for the fuel assembly with a discharge burnup of 35.50 GWD/MTU, which was irradiated for 4-reactor cycles in the Kori-1 NPP has been carried out while fuel rods selected from the assembly have been subjected to hot cell examination. In addition, several types of fastening devices for the dummy top nozzle of the fuel assembly have been fabricated and its reassembling forces tested to collect the design data for the reassembling device of the dismantled spent PWR fuel assembly. It is revealed that there is no any noticeable abnormality in the integrity of the fuel assembly under investigation. Fission gas releases seem to be 25-30cc which are about three times as much as those of 3-reactor cycle burnup fuel rods. The oxide layer thickness is about 30μm which is slightly thicker than that of the latter. Neverthelss, it is found that there is no detectable abnormalities in their integrity. Preliminary test results of fastening devices show that an internal expanding type one is excellent. (Author)