OSHA Accident Investigation · Summary #14484729
BURN,ELECTRIC ARC,INTERLOCK,CIRCUIT BREAKER
Event description
FLASH BURNS FROM ELECTRICAL SHORT
Investigation abstract
EMPLOYEES IN MAIN CONTROL ROOM WERE ENGAGED IN BALANCING THE PLANT'S ELECTRICAL E ARC OCCURRED FROM THE 12,500-VOLT POWER SUPPLY LINE. BOTH EMPLOYEES WERE BURNE D BY THE FLASH THAT CAME THROUGH EQUIPMENT OPENINGS IN THE PANEL. IT WAS DETERMI NED AFTER THE ACCIDENT THAT THE KIRK INTERLOCK WAS NOT FUNCTIONING. IT WAS IMMED IATELY ADJUSTED. LOAD. THIS WORK IS NORMALLY DONE BY ONE PERSON. THE PROCEDURES ARE TO REDUCE THE LOAD ON A PANEL; ELECTRICALLY TRIP THE CIRCUIT BREAKER; AND ACTIVATE THE KIRK I NTERLOCK BY OPENING THE LOWER CUBICAL DOOR, PUSHING IN THE LOCK RING AND REMOVIN G THE KEY. ACTIVATING THE KIRK INTERLOCK MANUALLY TRIPS THE CIRCUIT BREAKER, IF FOR SOME REASON IT HAD NOT ELECTRICALLY TRIPPED OUT, AND THEN IT MECHANICALLY PR EVENTS ANY FURTHER ELECTRICAL ACTIVATION OF THE BREAKER. THE KEY IS THEN PUT INT O THE LOCK ON THE OUTSIDE OF THE UPPER PANEL TO UNLOCK THE MANUALLY OPERATED PHA SE CHANGE SWITCH IN A NO LOAD CONDITION. IT WAS DURING THIS PHASE CHANGE THAT TH
Victims (2)
-
#1 Hospitalized Age 59 M
- Nature of injury
- 5
- Part of body
- 9
- Event type
- 14
- Source
- 15
- Occupation code
- 695
- Human factor
- 9
- Environmental factor
- 18
- Task assigned
- 2
-
#2 Hospitalized Age 62 M
- Nature of injury
- 5
- Part of body
- 17
- Event type
- 14
- Source
- 15
- Occupation code
- 695
- Human factor
- 9
- Environmental factor
- 18
- Task assigned
- 1
Codes shown verbatim from OSHA's accident-investigation database. A human-readable decoder is coming in a future release once the accident_lookup2 dictionary is loaded.