As the U.K. begins to fast-track nuclear power permitting, its safety regulator and those of Finland and France have sent Europe’s main nuclear plant supplier back to the drawing board. Already grappling with construction delays at its first EPR pressurized water reactor project—Finland’s Olkiluoto 3 (OL3) plant—Areva Np., Paris, must now also rethink key safety systems. In an unusual joint move, nuclear safety regulators in the U.K., Finland and France recently revealed safety concerns about the EPR’s control and instrumentation (C&I) systems. Photo: TVO Delays Finland’s Olkiluoto 3 nuclear plant may be started much later than the June 2012 deadline.
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.