Question

What is the different parts of a nuclear reactor ?

Answer 1

http://en.wikipedia.org/wiki/Nuclear_reactor
Generally, nuclear reactors have 3 principal parts.
1 Reaction chamber, where the radioactive material is stored and it produces heat.
2 Generation chamber, where the heat is converted to electricity.
3 Cooling section, where all the heat is disposed and coolant is "refreshed" to control the excess heat of the reactor.

Answer 2

containment building, reactor core (control rods), steam generator, turbine, electric generator, cooling towers, power grid