The ET-12 is a solid state eddy current tester designed specifically for nondestructively measuring the clad thickness of N-Reactor fuels. The tester incorporates a linearizing circuit to correct for the inherently nonlinear eddy current response to thickness of zircaloy-2 cladding over uranium. It replaces the UE-2B testers which have been used since initial startup of the reactor.nThe ET-12 represents a vastly simplified model in comparison with the UE-2B. Its design requires no transformers, no inductive filtering, and employs a large array of integrated circuits, including audio powers amp¬lifiers and internally compensated op amps.
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