OAK RIDGE, Tenn. (WATE) — A fire at one of the nation’s enriched uranium processing facilities on Wednesday did not result in the release of radioactivity, according to officials at the Y-12 National Security Complex in Oak Ridge, Tennessee.

Officials at Y-12 notified city officials, legislators and media that emergency response teams were handling an “incident” at a building on the western side of the Y-12 complex.

The fire at the Highly Enriched Uranium Materials Facility led to the evacuation of “a couple hundred employees,” a spokesman said and involved uranium in a metal-type form in a hood at Building 9212 — an original 1945-era building that is scheduled to be replaced in the coming years.

At a press conference, a Y-12 spokesman said internal monitors did not alarm — meaning no contamination was detected within the facility. No offsite impact has been detected. No injuries were reported.

Y-12 returned to normal operations just before 1 p.m., when officials said in a press conference that the situation was “stable.”

A hotline has been established by Y-12 to address public concerns.

Around 8:50 p.m., the Communications Manager at Y-12 confirmed the end of the emergency response operation. An investigation is ongoing to determine the cause.

The National Nuclear Security Administration oversees operations at the Pantex Plant in Amarillo, Texas and the Y-12 National Security Complex in Oak Ridge.

Y-12 supports the U.S. nuclear security enterprise through uranium storage, processing and manufacturing operations and is operated by Consolidated Nuclear Security, LLC for NNSA.