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The U.S. Department of Energy has determined one of the single-shell tanks storing radioactive waste at Hanford is leaking around 150 to 300 gallons of liquid per year.
DOE officials have not determined the cause of the leak.
The reported tank, the T-111 located in the T Tank Farm at Hanford, was built in the 1940s and was "stabilized" in February 1995. It currently contains approximately 447,000 gallons of sludge, a mixture of solids and liquids with a mud-like consistency. This is the first tank that has reportedly been leaking since the interim stabilization was completed in 2005.