Nuclear power plants are used to generate electric energy. Normally the Uranium atoms splits up and generates the nuclear energy, this process is called fission. This process generates heat and turn the water into the steam. The turbine runs with the help of this steam, As a result turbine turns the generator which in turn produces electricity. The generated electricity is sent to the transformers to produce the current with the correct voltage. The only disadvantage about this is that, the fuel used finally turns into a hazardous solid waste. Harmful radioactive rays are emitted from these solid wastes.
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The main reason to use the Uranium as the fuel in the Nuclear Power plants is that the by using the Uranium U-235, the controlled fission reaction can be achieved. The enormous heat generated by using the fission reaction is in turn used to spin the turbine to drive the generator. Nuclear pollution is very harmful to the humans and the plant species, The harmful radiations that are emitted from the Nuclear Power Plant solid waste will cause diseases like Skin Cancer, etc. But there is no option to generate electricity in a cheap way, this is the reason most of the countries opt to Nuclear power plants to generate electricity.