Event description: The licensee called to report a fire in the
depleted uranium (
DU) machining bay. The fire spread into the ventilation duct and filter housing. The fire was contained inside the ventilation duct and filter housing. The fire blistered the paint on the ventilation ducting and Torit filter housing and breached the ventilation system filters (bag and
HEPA). A minor release to the environment occurred through the stack. Visible smoke was observed coming through the stack for a 6 - 8 minute period until the ventilation blast gate was closed. Air sample data indicated the
uranium in air concentration in the machining area was 2%
DAC. The air effluent concentration through the stack was 15% of the effluent limit. Personnel were evacuated from the
DU machining area and from the office areas. Production at the grinder will not restart until the cause of the fire is known and corrective actions can be taken to prevent reoccurrence. A written report will be submitted to the Division.
Report number: TN-04-105