Preparations are being made to enclose, or “cocoon,” the K East Reactor, the seventh of nine former reactors at the Department of Energy’s Hanford Site. The cocooning project is expected to be completed by the end of the year.

Watch this video for more on the project.

Workers at the Department of Energy’s Hanford Site near Richland, Wash., recently completed testing a mock-up of a system that will be used to isolate and stabilize about 15,000 pounds of radioactive debris in the site’s K West Reactor spent fuel storage basin.