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"This became an option because the size of the ship makes it possible to deploy and recover such a long core barrel length over the starboard side of the ship between the stern and the midships A-frame."

The core barrel that holds the nuclear reactor core is shown here at Watts Bar 2 as it is being placed into the reactor vessel as part of reactor assembly.

The core barrel is more than 33 feet in height, weighs 282,000 pounds and holds the 193 fuel assemblies, but had to be fit in a space with less than a centimeter clearance in any direction.