The supervisor was trained in the meaning and use of orange warning tags at AGS, as were the lead person in the AGS Electronics Service Group and the two contract employees. Training also emphasizes that personnel should walk to the front of power supplies and review the signs and labels. The Security System Document was available to the AGS Beam Service Group supervisor and it was up to date. A visit to the area revealed that orange warning tags were visible only on the front of power supplies in the building. Only a few supplies in the building were interfaced with the Access Control System.
All supplies face the outer walls of the building in order to allow easier hookup.
Thus, orange tags are not readily visible when entering and working on the back side of power supplies in this building. The direct cause for this occurrence is that the lead person for the job failed to note that this power supply had an orange warning tag. This allowed the work to proceed without contacting the AGS Access Control Group as required. Written procedures call for authorized persons to work on this wiring hot, or in lieu of authorized persons, the Access Control System must be locked out and tagged out. The orange warning tags for power supplies interfaced to the Access Control System were not readily apparent to the workers.