UCOR’s deactivation and demolition (D&D) teams are making substantial progress at the former 210,000-square-foot Beta-1 uranium enrichment facility at the Y-12 National Security Complex. Following deactivation, the current focus is to fill the basement with controlled low-strength material (CLSM)—a concrete mixture— to stabilize the foundation for demolition equipment, with completion anticipated in May.
A significant challenge has been intrusive groundwater, with over 16.8 million gallons pumped to date. Previously, the Beta-1 basement was completely submerged, hindering deactivation and characterization. Rainfall also caused re-flooding, limiting access and requiring extra characterization planning.
Beyond groundwater, mercury was discovered in basement drainpipes. Inspections revealed 820 linear feet of mercury-containing drainpipe, which has since been cleaned and removed. Additionally, over 5,900 linear feet of basement piping underwent radiation surveying, leading to 4,000 linear feet identified that needed Non-Destructive Array (NDA) surveys. These surveys, inspections, and characterization efforts resulted in over 2,000 linear feet of drainpipes foamed for future removal.
Beta-1 crews also used LiDAR technology for detailed 3D mapping of the basement. LiDAR improves documentation accuracy and reducing crew exposure compared to manual methods. This precise mapping is crucial for future excavation, which involves the controlled removal of soil and debris post-demolition.
UCOR is coordinating with Consolidated Nuclear Security (CNS), who operates the Y-12 site, to remove remaining power from Beta-1. That will support Beta-4’s electrical needs and initiate Beta-1’s condemnation. Following CLSM pours this summer, Beta-1 will proceed to condemnation.
This effort, characterized by significant challenges and a strong commitment to worker safety, highlights teamwork across multiple groups: D&D, water treatment, radiation protection, industrial hygiene, safety, environmental, sampling, engineering, planning, and NDA. Their collective expertise and dedication to safety have been paramount.
