Skip to main content

Space History Photo: Control rods for Mock-Up Reactor

Plum Brook nuclear reactor, NASA
(Image credit: NASA.)

In this historic photo from the U.S. space agency, control rods for Plum Brook's Mock-Up Reactor, which entered the core from above, are shown.

In the Plum Brook reactor, the control rods entered from below. Three types of control rods were used in the Plum Brook reactor: two hydraulically controlled regulating rods to provide precise control of the reactor power level; three mechanically control reflector rods to provide a coarser level of control (the reflector rods had a quick release to allow them to drop and scram the reactor, if necessary); and five fueled shim rods, which performed the same function as the reflector rods.

For more information browse the Plum Brook Facility Page.

Each weekday, looks back at the history of spaceflight through photos (archive).

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at:

The National Aeronautics and Space Administration (NASA) is the U.S. government agency in charge of the civilian space program as well as aeronautics and aerospace research.