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42. Tell the function of the moderator and control rods in a nuclear reactor.

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The function of the moderator is to slow down the neutrons produced by fission to greatly increase the probably that they will go on to create even more fissions.

The function of the control rods is to control the rate of fission in the reactor. Because control rods absorb neutrons, inserting them further into the reactor slows down the nuclear chain reaction. Inserting them completely shuts down the reactor. To start up the reactor, the control rods are pulled out of the reactor just enough to sustain that reaction.


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  1. Yes, that ok for both moderator and control rods.

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