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At its heart, a nuclear power plant is a highly sophisticated steam engine. While traditional plants burn coal or gas, a nuclear plant relies on nuclear fission. Inside the reactor core, heavy atoms—typically uranium-235—are bombarded with neutrons. When a uranium atom splits, it releases a tremendous amount of heat energy and more neutrons, initiating a self-sustaining chain reaction. To keep this process safe, control rods made of neutron-absorbing materials are inserted or withdrawn to regulate the reaction's speed.
The intense heat generated by fission is absorbed by water circulating through the reactor. Kept under extreme pressure to prevent boiling, this superheated water transfers its thermal energy to a secondary loop of water, converting it into high-pressure steam. This steam is directed toward a turbine, forcing its blades to spin rapidly. Because the turbine is connected to a generator, this mechanical spinning is converted into the electricity that powers our grids.
Finally, the steam must be cooled back into liquid water to repeat the cycle. It passes through a condenser, cooled by water from a nearby source or the iconic cooling towers. Once condensed, the water is pumped back toward the reactor, completing a highly efficient, closed-loop cycle that generates massive amounts of reliable electricity without emitting greenhouse gases.
