EDDY-CURRENT EVALUATION OF NUCLEAR CONTROL RODS [report]

C.V. Dodd, J.H. Smith, W.A. Simpson
1973 unpublished
An eddy-current technique was developed and performed to detect cracks and measure thickness of cladding and oxide thickness on new and used nuclear control rods for the High Flux Isotope Reactor at the Oak Ridge National Laboratory. A computer design was performed for coils to maximize sensitivity to surface cracks and cladding thickness variations and minimize effects due to lift-off and temperature variations. In spite of radiation levels measured to be 10 5 R/h at 1 ft from the surface and
more » ... om the surface and temperature variations of 5°C on used control rods, flaws as small as 0.001 in. were detected and the cladding thickness was measured to within 0.001 in.
doi:10.2172/4583166 fatcat:hxeiplovdfaodggpsf4hnjc55e