The Shaw Group Inc. and Westinghouse Electric Co. LLC have signed a contract for engineering, procurement and construction of a two-unit nuclear powerplant at a greenfield site in Levy County, Fla. Progress Energy Florida Inc., the owner, expects to receive a combined construction and operating license from the Nuclear Regulatory Commission by early 2012. Current plans are for operation of the plant in the 2016-18 time frame, after which Progress Energy will retire its two oldest coal-fired units at the Crystal River Energy Complex in Citrus County, Fla. The new units will be AP1000 pressurized-water reactors, rated at 1,105 MW.
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.