KNOXVILLE, Tenn. – A fire at a Y-12 National Security Complex uranium processing facility in Oak Ridge, Tennessee has been contained, officials from the National Nuclear Security Administration said.

The fire at the Y-12 complex started in a uranium processing area in building 9212 on Wednesday at 9:14 a.m., Y-12 communications manager Taz Painter said in an email to Knox News.

Several hundred employees from building 9212 and others were evacuated. A 12:30 p.m. update from Y-12 stated all evacuated workers were accounted for and no injuries or contaminations were found.

Air monitors did not go off, which means there was no release of radioactive material, officials said. Officials said they did not yet know what caused the fire.  

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“This is an ongoing investigation,” said Y-12 spokesman Gene Patterson. “We are still in the process of figuring out exactly what that timeline is on what happened this morning.”

There are no worries for community members and there was no contamination because of the fire, officials stressed. Other parts of Y-12 are back to normal operations, officials said.

What is the Y-12 nuclear complex?

The Y-12 National Security Complex manufactures parts for America’s nuclear weapons, stores nuclear materials and provides enriched uranium to the U.S. Navy.

Y-12 was the Knoxville area’s fourth-largest employer in 2022, with 7,800 employees total.