From 1950 to 1990, the U.S. Energy Department produced an average of four nuclear bombs every day, turning them out of hastily built factories with few environmental safeguards that left behind a vast legacy of toxic radioactive waste.
Nowhere were the problems greater than at the Hanford Site in Washington state, where engineers sent to clean up the mess after the Cold War discovered 54 million gallons of highly radioactive sludge left from producing the plutonium in America’s atomic bombs, including the one dropped on the Japanese city of Nagasaki in 1945.
Cleaning out the underground tanks that were leaching poisonous waste toward the Columbia River just 6 miles away and somehow stabilizing it for permanent disposal presented one of the most complex chemical problems ever encountered. Engineers thought they had solved it years ago with an elaborate plan to pump out the sludge, embed it in glass and deposit it deep in the mountains of the Nevada desert.