Begin forwarded message:
From: Lillian Ruscic <[email protected]> Subject: 2 ORPS - Electrical Exposurea at ANL Date: July 28, 2011 11:16:04 AM CDT To: "William E. Allcock" <[email protected]>, Craig Stacey <[email protected]>
Please share this two electrical incidents reports with your groups.
The first was at the APS where a technician received a 120 V electrical shock across the arms and chest while changing out an internet switch in a power supply cabinet on May 3.
The second"
On 7/25/2011, at 9:35 a.m., an ion source engineer received a shock while performing helium leak tests on a high voltage source (i.e. Electron Cyclotron Resonance Charge Breeder source). The ion source engineer had earlier changed out an element of the electron cyclotron resonance charge breeder on the high voltage platform. Consistent high background gas peaks in the built-in residual gas analyzer (RGA) remained after the change. A systematic process of trying to locate leaks was begun. At the time of the incident, the engineer was testing around the Electron Cyclotron Resonance Charge Breeder source. Using a Tygon line connected to a helium gas cylinder with a metal Swagelock fitting on the far end, the engineer was holding the fitting while spraying helium around a Lexan flange through which a 1/4 in. Polyflow cooling line ran into the source through a shielded housing. The source was on at the time and was set to 30 kV and 0.75 mA with a maximum limit setting of 4 mA. A spark jumped from the Polyflow tubing to the Swagelok fitting and to the right index finger, and likely to the grounded vacuum line a short distance away. The engineer was uncertain that he had received a shock or was just surprised at the spark event, but immediately stopped the test, went to the control room, and dialed 911. He was taken to the Medical Division for observation and evaluation. He was released back to full duty a short time later.
Lillian Ruscic ESH QA Coordinator for CELS, LCF & MCS B240 AES 2-4471
-- Craig