Control rod testing apparatus

摘要

A control rod testing apparatus with a testing subassembly (30) floatingly secured in a guide structure (20, 48, 50). Two centering means (64, 76) center the subassembly (30) around the rod being tested. Pancake coils (72) sense the proximity of sensing fingers (82) which side against the periphery of the rod being tested for the purpose of determining the geometry of the rod.