A copper-alloy bolt, one of two used to secure the end fittings on each end of the 132 fuel channels to the calandria at NPD. The bolt is 13 cm in length and 2.5 cm in diameter; it measures 2.9 cm across the hex head.
The lower right-hand photo, taken 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 – shows the end of the fuel channel and the bracket with the boss for the two bolts.
