DOE begins demolition of Isotope Row at Oak Ridge National Laboratory after six years of decontamination

After six years of decontamination work, the Department of Energy (DOE) has begun tearing down Isotope Row — a cluster of 5 facilities at Oak Ridge National Laboratory that once produced radioisotopes for medical, industrial, and defense use. Demolition is expected to wrap up by the end of 2026.

The buildings, constructed between the late 1940s and early 1960s, sat idle after isotope production ceased in the early 1990s. Contaminated equipment left behind required specialized cleanup before any wrecking crew could move in.

Demolition of Isotope Row officially underway

The Department of Energy confirmed last week that demolition at Isotope Row is now officially underway — ending a long preparatory phase and kicking off the physical teardown of all 5 structures on the site.

Work is expected to be done by the end of 2026, making this one of the more significant near-term milestones in DOE’s legacy cleanup program at Oak Ridge.

Work is expected to be done by the end of 2026, making this one of the more significant near-term milestones in DOE’s legacy cleanup program at Oak Ridge. And none of it happened quickly. Six years of decontamination work had to come first, a process that was anything but simple given what these buildings used to house.

Why decontamination took six years before teardown could begin

When isotope production stopped in the early 1990s, the facilities weren’t just emptied and locked up. They were left with contaminated ventilation systems, hot cells, and specialized equipment that had absorbed decades of radioisotope exposure.

Hot cells — heavily shielded enclosures used to handle radioactive materials remotely — are among the most complex structures to decontaminate. Standard tools don’t cut it. Every step requires careful planning, specialized protective gear, and strict protocols to keep contamination from spreading.

Ventilation systems present their own complications. Over years of operation, radioactive particles accumulate in ducts, filters, and fans, and removing or stabilizing that contamination safely demands both time and precision. The nature of radioisotope contamination also varies depending on which isotopes were produced and how long ago — some decay relatively quickly, while others persist for decades. Cleanup teams had to assess each area individually rather than applying any blanket approach.

Six years, in that context, reflects how complex the work actually was. Not a lack of urgency.

What the demolition means for the ORNL site and cleanup timelines

Tearing down these 5 aging structures will eliminate contamination hazards that have been sitting on the ORNL campus for more than 30 years — a meaningful reduction in the site’s overall risk profile. For DOE’s cleanup program at Oak Ridge, finishing this demolition by year-end would be a concrete, visible result. Legacy cleanup programs often involve years of work that’s hard to see from the outside. A demolished building is hard to miss.

Once demolition wraps up and remediation is confirmed complete, the cleared land could potentially become available for new uses, though what that looks like in practice depends on final environmental assessments.

Oak Ridge National Laboratory remains one of the country’s most active scientific research facilities. Removing infrastructure that no longer serves a purpose — and that actively poses contamination risks — frees up resources for work that actually matters now.

History of Isotope Row and its role in mid-20th century science

To understand why this demolition matters, it helps to know what Isotope Row actually was.

The 5 facilities were built at ORNL between the late 1940s and early 1960s, when the U.S. was rapidly expanding its nuclear science capabilities. Oak Ridge had already played a central role in the Manhattan Project, and after World War II it became a hub for peacetime nuclear research and production. Isotope Row was purpose-built to supply radioisotopes across a wide range of applications — medical diagnostics, cancer treatment, industrial processes, and scientific research. Defense applications were part of the mix too, reflecting the dual-use nature of nuclear technology throughout the Cold War.

At the time, this was genuinely cutting-edge work. Many of the isotopes produced at Oak Ridge had no other domestic source, and the facilities represented a serious national investment in both scientific capacity and public health infrastructure.

Production continued for roughly four decades before stopping in the early 1990s. After that, the buildings sat idle — not demolished, not fully decommissioned, just remaining on the landscape and accumulating the kind of legacy contamination that DOE would eventually have to address.

What to take away from this project

Here’s the short version of what’s happening and why it matters.

The Department of Energy has started demolishing Isotope Row, a group of 5 facilities at Oak Ridge National Laboratory that produced radioisotopes from the late 1940s until the early 1990s. Before physical demolition could safely begin, six years of decontamination work had to be completed — targeting contaminated hot cells, ventilation systems, and specialized equipment throughout the site.

Demolition is expected to wrap up by the end of 2026. Finishing it will eliminate long-standing contamination hazards at the ORNL campus and mark a significant milestone in the Department of Energy‘s Oak Ridge cleanup program. Once remediation is confirmed complete, the land could open up for future use.

Kelly Lippke

Kelly is an experienced writer with 15 years of experience exploring the big stories that shape our world, from tech breakthroughs and space exploration to climate, energy, and the fascinating quirks of science. She has a talent for turning complex ideas into sharp, memorable insights that stay with readers long after they’ve finished reading.