Presentation of the Investigation Results from the FSU High Field Magnet Lab Fatality

During April 2016, Betsy Dunn, the lead investigator of the fatality at Florida State University, visited Jefferson Lab to share the results of the investigation. The causes of this event were widespread, ranging from design issues, to Lock/Tag/Try, training and human performance, all of which are pertinent to our work planning at Jefferson Lab.

If you missed Betsy's presentation, she will be giving an encore presentation at the Accelerator Safety Workshop here at Jefferson Lab – on Wednesday, August 16, 2017, at 2:30 p.m. in the CEBAF Center Auditorium.  Please reserve the first 8-10 rows for the conference participants, otherwise the auditorium is open seating.

Summary of Event:

On October 21, 2015, two National High Magnetic Field Laboratory (NHMFL) mechanical technicians were involved in an incident while attempting to remove a Victaulic blind flange from supply piping on a Magnet Cooling Water (MCW) System. The mechanical technicians were assisting a welder to obtain measurements to make final connections from the MCW system to a new Cell 14 cryostat as part of the Series-Connected Hybrid magnet project. When loosening the nuts on the Victaulic flange collar, a pressure excursion occurred. The flange, the water behind the flange, or some combination of both, struck and propelled one mechanical technician backward and into the metal support structure for the cryostat, resulting in his death. A second technician, who was approximately 10 feet away at the time of the explosion, sustained minor injuries.