Devices, usually in the form of rods or bars, attached to the expansion joint assembly whose primary function is to distribute movement between the two bellows of a universal expansion joint. Control rods are not designed to restrain pressure thrusts.
are long slender metal-clad rods which move into or out-of nuclear fuel assemblies in the reactor core to control the rate of the nuclear fission process.Â The rods contain a neutron absorbing material which, when inserted into the fuel, absorb neutrons, slowing down the fission rate and thus the heat generation rate and reducing the power level of the reactor.
Devices that can be raised and lowered in the reactor core to absorb neutrons and regulate the chain reaction. The speed of the chain reaction is controlled by control rods. See; Light-Water Reactor, Pressurized-Water Reactor, Reactor.
Control rods regulate the number of neutrons in the core of a nuclear reactor and so control the rate of the reaction. They are plates or tubes holding material, such as cadmium or boron, that absorbs neutrons.