control rod

noun
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:
1940–45

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World English Dictionary
control rod
 
n
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 10th Edition
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Example sentences
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.
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