Crews with the Department of Energy’s Office of Environmental Management (EM) have completed the demolition of Building 9207, the largest and final building at the former Biology Complex at the Y-12 National Security Complex in Oak Ridge, Tenn., the DOE announced this week. Removal of the massive six-story, 255,000-square-foot building ushers in a new chapter of transformation at Y-12, the DOE said.

A project to reduce by approximately half the high-security protected area at the Department of Energy’s Y-12 National Security Complex in Oak Ridge, Tenn., will avoid millions of dollars in costs and accelerate cleanup, the DOE’s Office of Environmental Management (EM) announced.

Workers with the Department of Energy’s Office of Environmental Management (EM) recently began demolishing the last facility standing in the former Biology Complex at the Y-12 National Security Complex at the Oak Ridge Reservation in Tennessee.

As announced by EM on March 23, removal of the massive six-story, 255,000-square-foot Building 9207 creates a new chapter of transformation and modernization for Y-12. Completion of the Biology Complex demolition is one of EM’s 2021 priorities.

According to EM, the facilities in the Biology Complex presented significant structural risks due to their deterioration, and their condition landed them on DOE’s list of high-risk excess contaminated facilities.

Crews cleaned and demolished COLEX equipment on the west end of the Alpha-4 building at the Y-12 National Security Complex. Photo: DOE

The Department of Energy’s Oak Ridge Office of Environmental Management and its contractor UCOR have found a way to reuse instead of dispose of mercury collected from a cleanup project at the Y-12 National Security Complex, near Oak Ridge National Laboratory in Tennessee. “This questioning attitude and innovative thinking by our workforce is a major contributor to how our program is able to accomplish its projects under budget and ahead of schedule on a consistent basis,” said OREM manager Jay Mullis.

The DOE is conducting a number of projects to address mercury contamination—the most significant environmental risk is at Y-12, according to the agency. The work includes the cleanout and removal of equipment at Y-12's Alpha-4, a building that was used initially for uranium separation in 1944 and 1945. Ten years later, the building started being used for lithium separation, a process that required large amounts of mercury and involved column exchange (COLEX) equipment. Over the years, a significant amount of mercury from the process leached into the equipment, buildings, and surrounding soils.