Semantic search
Jump to navigation
Jump to search
| Entered date | Event description | |
|---|---|---|
| ENS 44554 | 9 October 2008 16:08:00 | On October 9, 2008, during scheduled monthly testing per surveillance procedure 3-PT-M62C, '480 volt Undervoltage Degraded Grid Protection System Bus 6A Functional,' the normal supply power to 480 volt safeguards Bus 6A de-energized resulting in the start and load of Bus 6A by the 32 Emergency Diesel Generator (EDG), and the actuation of the '33' motor driven Auxiliary Feedwater Pump (AFWP), and the '32' steam driven AFWP. All equipment performed as designed. Auxiliary feedwater (AFW) was injected into the Steam Generators (SG). Core reactivity changes as a result of AFW injection resulted in an 0.1% increase in reactor power. SG level change from normal of approximately 1-2% with no actuation of SG alarms, no challenge to automatic control, and no rod movement. No significant change to the Nuclear Instrumentation was observed. Normal supply power was restored to bus 6A and the EDG-32 returned to Auto. Investigation into the cause of the event is in progress. Unit 2 was unaffected and is at 100% power. The licensee notified the NRC Resident inspector. |