Respuesta :
Control rods or blades These are made with neutron-absorbing material such as cadmium, hafnium or boron, and are inserted or withdrawn from the core to control the rate of reaction, or to halt it. * In some PWR reactors, special control rods are used to enable the core to sustain a low level of power efficiently
What is Control rods or blades ?
In nuclear reactors, control rods are used to regulate the rate at which uranium or plutonium fissions take place. Chemical substances like boron, cadmium, silver, hafnium, or indium that may absorb lots of neutrons without self-decay are present in their compositions.
For neutrons of different energy, these elements have distinct neutron capture cross sections. Breeder reactors use fast neutrons, whereas boiling water reactors (BWR), pressurized water reactors (PWR), and heavy water reactors (HWR) use thermal neutrons. Depending on the energy spectrum of its neutrons, each reactor design can use a different type of control rod material.
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