Fire at the Savannah River nuclear lab triggered an ‘unfiltered ground-level radiological release’ (Image: NC)
An emergency was declared at a massive nuclear complex in the US after a fire broke out at a laboratory handling radioactive materials, triggering restrictions on air and rail traffic and incoming vehicles. The fire prompted an emergency declaration at Savannah River National Laboratory in South Carolina , a vast facility where the US government once produced materials used in nuclear weapons, including tritium and plutonium-239. Incoming traffic was shut down, while air and rail services in the surrounding area were restricted as emergency measures were put in place.
Staff in the area were ordered to shelter for 30 minutes.
The emergency declaration was the second-highest of three categories used at the site, indicating that something more serious had occurred, according to the complex’s community preparedness information. The Federal Aviation Administration (FAA) also described it as a US Government “nuclear incident”.
The alert was lifted on Wednesday night after the fire had been brought under control. The site subsequently returned to normal operations. Officials said no detectable levels of contamination had been found, easing fears of a potential radioactive release from the sprawling former nuclear weapons complex.
The laboratory sits in the north-western corner of the Savannah River Site, which opened in the early 1950s as the Cold War intensified.
Although the complex was originally built for nuclear weapons production, its role has since shifted towards environmental cleanup, nuclear waste management and the handling of nuclear materials.
However, the laboratory continues to conduct experiments involving nuclear materials and processes radioactive substances, raising concerns about the potential consequences of a fire in such a facility.
An event is in progress that has triggered emergency response activities at the Department of Energy’s Savannah River Site. This message is being sent to you as part of our emergency response organization information process.
— Savannah River Site (@SRSNews) October 28, 2026
Edwin Lyman, director of nuclear power safety at the Union of Concerned Scientists, said the absence of reported contamination beyond the site was reassuring.
He also pointed to the buffer zone separating most of the complex’s facilities from public areas.
But he warned that fires involving radioactive materials demand particularly stringent precautions because of the risk of contamination spreading.
He said: “You need to take extreme precautions because of the potential dispersal of that material and the potential for contamination, potential for the public to be exposed.”
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The laboratory also operates a facility dedicated to recovering radioisotopes from used nuclear fuel, underlining the nature of the radioactive materials handled at the site.
The Savannah River Site was established during the early years of the Cold War, when the US was expanding its nuclear weapons programme.
Its historic role makes any incident involving fire and radioactive materials particularly sensitive, even when officials report no detectable contamination.
The emergency declaration was terminated after the blaze was extinguished, and the site resumed normal operations.
Officials have not reported any detectable contamination resulting from the incident.
