The measurement of oxide layer thickness of the irradiated fuel rod

The oxide layer thickness of fuel rod irradiated for 2 cycles in the Kori-2 unit reactor was measured by using the measurement by the eddy current system. Using standard specimens, the oxide layer measurement apparatus was calibrated, and also the measurement method was established. The oxide layer thickness of the irradiated fuel rod gradually increased from a few of μm to 23μm as the maximum value at 3000mm from the bottom end of fuel rod. The oxide layer thicknesses examined by the measurement of the layer thickness are in good agreement with those examined by a metallographic examination. This suggest that the examination of oxide layer of irradiated fuel rod is reliable as the same as the metallographic examination