Eddy Current Testing of FBR Fuel Cladding Tubes

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It is purported to establish an eddy current testing technique to inspect stainless steel fuel cladding tubes. (1) The eddy current detector can find out the flows which are difficult to be detected by the ultrasonic flow detector due to its shape and location. These flows are detectable by improving the existing ultrasonic flow detection method and also by using the system in which the ultrasonic flow detector is used in combination with the ultrasonic thickness gauge. (2) The eddy current detector can precisely and accurately detect the surface caves, pits, or griding parts of surface. (3) The eddy current detector frequently indicates signals of flows or gives a larger background noise due to the localized wall thickness variations or inner diameter changes. (4) A coarse surface sometimes affect and increase the back-ground noise of the eddy current recording chart. (5) Other than the above, in some cases, the eddy current detector gives out signals of unknown causes. At present, ultrasonic flow detector is used in combination with the ultrasonic thickness gauge.