The Swedish Nuclear Fuel and Waste Management Company (SKB) has chosen a site for permanent storage of highly adioactive spent fuel from Swedish plants. The site, near Forsmark, is 75 kilometers north of Stockholm. Estimated to cost between $2.5 billion and $3.2 billion, the repository includes 50 km of tunnels in granite bedrock 500 meters underground, requiring the excavation of 1.8 million cu m of rock. Spent fuel would reside in 25-tonne copper-coated canisters, surrounded by a buffer of bentonite clay that would act as a watertight barrier. SKB plans to submit two applications to Swedish environmental and nuclear authorities
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.