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The Hanford Site occupies 586 square miles (1,518 km 2) – roughly equivalent to half the total area of Rhode Island – within Benton County, Washington. [1] [2] It is a desert environment receiving less than ten inches (250 mm) of annual precipitation, covered mostly by shrub-steppe vegetation.
By then Hanford was no longer making plutonium. Reactors started shutting down in the mid-1960s; the last one closed in 1987. It was exclusively a massive environmental hazard that needed to be ...
During the Cold War, the Hanford Site facilities were expanded to include nine nuclear reactors and five large plutonium processing complexes that produced plutonium for most of the more than 60,000 weapons built for the US nuclear arsenal. After sufficient plutonium had been produced, the production reactors were shut down between 1964 and 1971.
The building, known as the 236-Z Building, was four storeys high, with a two storey penthouse, and made from reinforced concrete. Concrete walls 10 inches (250 mm) thick permitted plutonium was as much as 20% plutonium-240 and 10% plutonium-241 content to be handled. Glove box shielding allowed for 12% plutonium-240 and 3.2% plutonium-241.
The 580-square-mile Hanford nuclear reservation site adjacent to Richland was used from World War II through the Cold War to produce nearly two-thirds of the plutonium for the nation’s nuclear ...
The Hanford nuclear reservation adjacent to Richland, Wash., was used from WWII through the Cold War to produce nearly two-thirds of the plutonium for the nation’s nuclear weapons program.