Photo courtesy of DOE Highly radioactive buildings are among many in Hanford's former atomic-bomb fuel-production area that are scheduled to be demolished. Photo courtesy of DOE Workers seal a waste disposal container, while excavators take apart the so-called 327 production building last year. In the last substantial cleanup of highly radioactive waste in an area of the U.S. Dept. of Energy’s Hanford nuclear-waste site that was once the core of nuclear-reactor fuel production for atomic bombs, crews will use a gantry crane and grout to move and seal a vault and tank weighing 1,700 tons. The pick, part of the
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.