What is the function of control rods in a nuclear reactor?

What is the function of control rods in a nuclear reactor?

• A. To absorb neutrons and regulate the chain reaction
• B. To regulate water flow
• C. To generate heat
• D. To convert heat into electricity

Answer: (A)

Control rods manage how fast the nuclear chain reaction proceeds by absorbing neutrons that would otherwise continue fission. Made from neutron-absorbing materials like boron, cadmium, or hafnium, they can be inserted deeper into the reactor to capture more neutrons and slow or halt the reaction, or withdrawn to let more neutrons participate and increase power. This keeps the reactor at a controlled, steady level of activity (criticality). The rods themselves don’t regulate the water flow, they don’t generate heat, and they don’t convert heat into electricity—those roles belong to the cooling/moderation system and the turbine-generating equipment, respectively.

Control rods manage how fast the nuclear chain reaction proceeds by absorbing neutrons that would otherwise continue fission. Made from neutron-absorbing materials like boron, cadmium, or hafnium, they can be inserted deeper into the reactor to capture more neutrons and slow or halt the reaction, or withdrawn to let more neutrons participate and increase power. This keeps the reactor at a controlled, steady level of activity (criticality). The rods themselves don’t regulate the water flow, they don’t generate heat, and they don’t convert heat into electricity—those roles belong to the cooling/moderation system and the turbine-generating equipment, respectively.