Nuclear fission happens when a neutron smashes into the core material which breaks off neutrons from the atoms. The neutrons being broken off is where you get the immense release of energy in the form of heat. Water is used tp cool the materials. That cooling water is used to generate steam. That steam turns a turbine which converts it into electricity.
Hot rock make hot water, hot water make steam, steam make iphone and tesla juice.
The control rods absorb neutrons thus interrupting the self perpetuating cycle of nuclear fission.
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