The operation of a nuclear reactor is as follows: as the reaction occurs, the uranium fuel becomes hot water pumped through the core in contained pressure tubes removes the heat from the fuel the water boils into steam the steam turns two turbines which spin electrical generators the water is cooled ...and the process continues on and on.
All the reactor is really doing is boiling water which in turn, becomes steam and turns turbines to generate electricity.
The Reactor Vessel houses all of the other reactor parts
The Core consists of a huge container filled with the graphite blocks (in RBMK reactors)
The Control Rods long metal rods which, in the Chernobyl reactors, contain boron they help control the chain reaction by absorbing free neutrons an elevator-like device just outside of the reactor vessel inserts or withdraws the rods to slow down or speed up a chain reaction, respectively
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