Nuclear power plants do not have smoke stacks. That is something you find on coal, oil and gas power plants. What you are likely confusing for smoke stacks is cooling towers. These are a feature of some nuclear, coal, oil and gas power plants. Others use a nearby body of water for cooling or even remote heating of houses as a form of cooling. The cooling towers use the evaporation of water to cool steam so it condenses back into liquid. This requires a lot of surface area. So a cooling tower is wide to provide lots of surface area for the evaporation. However a smoke stack tends to be narrow and much taller.
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