An eight cm long segment removed from one of the fuel channels on NPD2 after shutdown. A tube-slitting device, which cut a groove into the tube in two locations roughly 90 degrees apart, was run along the inside of the tube to allow extraction. The lower diagram was extracted from “A Description of NPD” – an illustrated talk presented at the Seventh AECL Symposium on Atomic Energy, Chalk River, September 18, 1961 by J. L. Olsen of CGE.
