NUCLEAR POWER PLANT

A nuclear is that part of nuclear plant in which nuclear fuel is subjected to controlled nuclear fission.In the process of fission heat is generated which is used to heat a coolant.The coolant transfers heat to the heat exchanger to produce steam.The steam generated in the heat exchanger is admitted to the turbine which is coupled to the alternator.The alternator converts mechanical energy into electrical energy.The steam after expansion through the turbine is condensed in the condenser.The condensate pump sends the condensate back to the heat exchanger thus forming a closed-feed system.The reactor  heat exchanger are equivalent to the furnace and the boiler in a conventional coal-fired steam power plant.
MAIN PARTS OF A REACTOR
The main parts of a reactor are as follows:
1.Reactor core.
2.Moderator.
3.Reflector.
4.Shielding.
5. Reactor control.
6.Cooling system.

1.Reactor Core.The reactor consists of a number of fuel rods made of fissile material.
2.Moderator.This material in the reactor core is used to moderator,or reduce,the neutron speeds to a value that increases the probability of fission occurring.
3.Reflector:this completely surrounds the reactor within the thermal shielding arrangement and helps to bounce escaping neutrons back into the core.this conserves the nuclear fuel,as the low-speed neutrons thus returned are useful in continuing the chain reaction.