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control rod

a neutron-absorbing material, as boron or cadmium, in the shape of a rod or other configuration, that can be moved into or out of the core of a nuclear reactor to regulate the rate of fission.
Origin of control rod
1940-45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for control rod
  • In response to the control rod withdrawal, reactor power will increase.
  • He calculated the number of fission neutrons to be expected as the control rod was pulled from the pile.
  • Examples include materials for the core barrel and core internals, such as the control rod sleeves.
  • Over the past few months, the reactor's beam plugs and control rod blades were also removed and are being transported off site.
British Dictionary definitions for control rod

control rod

one of a number of rods or tubes containing a neutron absorber, such as boron, that can be inserted into or retracted from the core of a nuclear reactor in order to control its rate of reaction
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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