How do nuclear reactors utilize chain reactions?
I tried this:
During a CONTROLLED chain reaction in a reactor, the energy released during the fission of, say, Uranium, is used to heat up water, vaporize it, and use it (high pressure steam) to move a turbine connected to a dynamo to produce electricity.
The chain reaction (breaking of Uranium into two lighter elements with the release of energy and neutrons) is controlled by inserting special rods (made od Boron for example) into the Uranium fissionable material (where the chain reaction is occurring) to absorb neutrons (the chain reaction's bullets that, striking other Uranium atoms, propagate the chain reaction!) and slow down the reaction controlling it.