Severity
Incident
Was Hydrogen Released?
Yes
Was There Ignition?
Yes
Ignition Source
self-ignition due to gas friction; mechanical friction or electric current
Incident Date
Sep 20, 2008
Setting
Equipment
- Cooling Equipment
- Main Generator Stator Cooling Water System
Damage and Injuries
Probable Cause
Contributing Factors
When Incident Was Discovered
Lessons Learned
The turbine components that caused the vibrations were a retrofit design which had been in service for about two years and were under warranty from the vendor. The root cause analysis of the event determined that the damage was caused by a defect in the design or assembly of the turbines.