CH2M HILL Plateau Remediation Company has finished placement of concrete to close more than 50 openings in the K East Reactor building. The K East Reactor is one of nine former plutonium production reactors along the Columbia River at Hanford. The work is part of the ongoing effort to decommission and prepare the K East Reactor for eventual interim safe storage, or cocooning. PHOTO COURTESY U.S. DEPARTMENT OF ENERGY