Type: Lessons Learned
Publisher: Argonne National Laboratory, Lemont, Illinois
A technician was performing electrical troubleshooting of a robot located inside a hot cell. The technician paused electrical troubleshooting in order to leave the immediate work area. Prior to leaving the area, the technician turned off the control panel, but failed to turn off the circuit breaker or unplug the power supply to the power supply cabinet. Additionally, the power supply cabinet door was left open with a multi-meter attached.
The technician failed to control hazardous energy as required by work control document for performing electrical troubleshooting because he was distracted and focusing on obtaining SME support outside the immediate work area to continue electrical troubleshooting. Additionally, the technician believed (i.e. mental lapse) that he had powered down the control cabinet when he left the work area as there were multiple iterations of shutting off the cabinet, circuit breaker, and cabinet power supply during the trouble shooting process for proper control of hazardous energy.
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