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| Entered date | Event description | |
|---|---|---|
| ENS 41072 | 26 September 2004 00:35:00 | At 2356 (EDT), September 25, 2004, off-site power was lost for both units. At the time of the event both units were in mode 4 and cooling down to meet shutdown entry conditions. The shutdown of both units was due to hurricane conditions from hurricane Jeanne. All four emergency diesels (2 per unit) started and properly loaded. Both units are stable in natural circulation cooling. Efforts continue to place both units on shutdown cooling. All systems operated as expected. The plant was already in a Notification of Unusual Event due to the Hurricane. Shutdown Cooling was established on Unit 1 at approximately 0020 EDT on 9/26/04. The licensee informed both state and local agencies and the NRC Resident Inspector. A conference call was held at approximately 0005 EDT with R2 Response Manager (Len Wert), NRR EO (Stu Richards) and IRD (Susan Frant) to discuss the loss of offsite power. The participants concluded that the NRC Monitoring Mode entered at 1515 EDT on 9/25 for the Hurricane was appropriate.
At 2356, September 25, 2004, St. Lucie Station, Units 1 and 2, experienced a loss of off -site power (LOOP). At the time of the LOOP all four emergency diesel generators started and loaded the safety related buses. In it's initial notification of the LOOP (0035 09/26/04, EN# 41067), FPL reported that all systems had performed as expected. However, during it's post LOOP walkdowns of the control room boards the control room operators determined that the 1 B Intake Cooling Water (ICW) pump had not automatically started as expected. The pump was subsequently started from the control room using the manual control switch. The cause for the failure to automatically start will be investigated and corrected prior to returning the unit to service. Notified R2 Response Manager (Len Wert)
At 1050 EDT both units recovered offsite power exiting the criteria for the UE based on LOOP. The licensee informed state and local agencies and the NRC Resident Inspector. HOO Note: See related ENs # 41067, 41071 and 41073. |
| ENS 41073 | 26 September 2004 02:45:00 | At approximately 2315 (EDT), September 25, 2004, the NRC Operations Center reported that their link to the Emergency Response Data System (ERDS) had been lost. It was determined that the link had been lost at 1909 (EDT) that same day based upon the logged time of the last data update. The station was in constant communications with the Operations Center at the time due to the severe weather in the area due to hurricane Jeanne. The link was restored for both units at 2344 (EDT) the same day by performing the normal initiation procedure. It is suspected that the link was lost due to a momentary transient on the FTS circuit due to the weather conditions. The link was lost again at approximately 0103 (EDT), 9/26/04. The unit 1 ERDS link was restored approximately one hour later, troubleshooting of the unit 2 is in progress. The licensee informed the NRC Resident Inspector. HOO Note: See related ENs # 41067, 41071 and 41072. |