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Control Rods and Control Rod Drive
The material in the control rods absorb neutrons and so restrain and control the reactor's nuclear fission chain reaction. The rods themselves have a cruciform cross section.
They are inserted upwards, from the base of the RPV, into the rod spaces in fuel assemblies.
In the ABWR, the position of each rod is regulated by its Fine Motion Control Rod Drive (FMCRD), which is actuated by an inverter drive system during normal operation.
It also applies hydraulic scram.
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