Workers have repaired a roll-up door that failed to close when a fire alarm system was activated at a high-security uranium storage building at the Y-12 National Security Complex in May.

“The fire alarms were activated due to smoke from a belt of a fan with a failed bearing, but there was no fire,” the Defense Nuclear Facilities Safety Board said in a May 24 report. “The signal to the door closure device should cause a cable to release, allowing the door to close, but this did not occur because permanent deformation (kinks) in the cable caused it to knot when tension was released.” [Read more…]