In southeastern Washington state, Bechtel National, Inc. is designing, constructing and commissioning the world’s largest radioactive waste treatment plant for the U.S. Department of Energy (DOE). When complete, the Hanford Tank Waste Treatment and Immobilization Plant (WTP) will process and stabilize 53 million gallons of radioactive and chemical waste currently stored at the Hanford Site.
The waste, a byproduct of national defense plutonium-production efforts during World War II and the Cold War era, resides in 177 aging underground tanks. Of these, more than one-third of have already leaked, contaminating the subsurface and threatening the nearby Columbia River.
The $12.2 billion WTP will use vitrification technology, which involves blending the waste with glass-forming materials and heating it to 2,100 degrees Fahrenheit (1,149 degrees Celsius). The mixture is then poured into stainless steel canisters to cool and solidify. In this glass form, the waste is stable and impervious to the environment, and its radioactivity will dissipate over hundreds to thousands of years.
While vitrification has been employed successfully at other radioactive waste cleanup sites, it has never been attempted at the scale or on waste as complex as that stored at Hanford. The WTP Project is a feat of engineering and construction at an unprecedented level. It is the largest undertaking of its kind ever and one of DOE’s most technically challenging cleanup projects.
The WTP Project is equivalent to building two nuclear power plants and is being constructed at a time when a new nuclear facility has not been built in the U.S. for decades. Its construction site spans 65 acres and includes four major nuclear facilities -- Pretreatment, Low-Activity Waste Vitrification, High-Level Waste Vitrification and Analytical Laboratory. The largest of these structures, the Pretreatment facility, has a footprint equivalent to four football fields and will be 12 stories tall when finished. Operations and maintenance buildings, service utilities and office space complete the complex that overall requires more than 260,000 cubic yards of concrete, 36,000 tons of structural steel, and nearly one million feet of piping. Construction began in October 2001, and, in late 2009, the plant surpassed the 50-percent complete mark.
Construction is expected to be complete in 2016, and, following commissioning, the plant will be operational in the fall of 2019.