The function of a moderator in a nuclear reactor is to
The function of a moderator in a nuclear reactor is to-
Answer is :moderate the velocity of secondary neutrons
During a nuclear reaction free neutrons are continually created. These neutrons split other uranium or plutonium atoms in a process which creates even more neutrons in a chain reaction. If the neutrons multiply too rapidly you don't have a controlled nuclear reactor but rather something resembling an atom bomb.
The role of a moderator is to absorb neutrons. By controlling the amount of moderator material in the reactor you can maintain the reaction in a controlled state, ie the nuclear reaction is sustained, producing heat, but not leading to an uncontrolled explosion.
The moderator material is made in the form of graphite rods which are inserted into the reactor to absorb the neutrons.
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