Argonne National Laboratory has successfully swapped out an aging cold trap in the sodium test loop called METL (Mechanisms Engineering Test Loop), the Department of Energy announced April 23. The upgrade is the first of its kind in the United States in more than 30 years, according to the DOE, and will help test components and operations for the sodium-cooled fast reactors being developed now.

The Department of Energy’s Office of Clean Energy Demonstrations issued a draft environmental assessment (EA) in early November for a test and fill facility (TFF) that TerraPower plans to build in Kemmerer, Wyo.—the town selected two years ago to host the company’s first Natrium sodium fast reactor. The draft EA, open for comment through December 1, describes TerraPower’s plans to construct a nonnuclear facility that would safely store about 400,000 gallons of sodium to test coolant system designs and ultimately fill the planned reactor.