MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Nuclear power. Penly nuclear power station at dusk. This power station, near Dieppe in France, contains two 1290 MegaWatt pressurized water reactors. In a pressurized water reactor (PWR) heat generated in the nuclear core is removed by water which circulates at high pressure through a primary circuit. Heat is transferred from the primary to a secondary circuit via a heat exchanger, thereby generating steam in the secondary circuit which can be used to power turbines. PWRs are relatively inefficient, and about 60% of the heat energy generated escapes as the water coolant is 'dumped' usually into the sea, lake or river alongside the plant.
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