The Flamanville Nuclear Power Plant is located at Flamanville, Manche, France on the Cotentin Peninsula. The power plant houses two pressurized water reactors (PWRs) that produce 1.3 GWe each and came into service in 1986 and 1987, respectively. It produced 18.9 TWh in 2005, which amounted to 4% of the electricity production in France. In 2006 this figure was about 3.3%. At the time, there were 671 workers regularly working at the plant.

The Cotentin Peninsula, also known as the Cherbourg Peninsula, is a peninsula in Normandy that forms part of the northwest coast of France. It extends north-westward into the English Channel, towards Great Britain. To its west lie the Gulf of Saint-Malo and the Channel Islands, and to the southwest lies the peninsula of Brittany.