PNO-I-08-001, A: Seabrook, Update - Unplanned Shutdown Greater than 72 Hrs Resulting from Automatic Reactor Trip Due to Ground Fault on 345kv Line
| ML080320162 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 01/31/2008 |
| From: | Arthur Burritt, Raymond W NRC Region 1 |
| To: | |
| Burritt A RGN-I/DRP/PB3/610-337-5069 | |
| References | |
| PNO-I-08-001A | |
| Download: ML080320162 (2) | |
January 31, 2008 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-I-08-001A This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region I, King of Prussia, PA, staff on this date.
Facility License Emergency Classification Florida Power & Light Energy _____Notification of Unusual Event Seabrook 1 _____Alert Seabrook, NH _____Site Area Emergency Docket: 050-00443 _____General Emergency License: NPF-86 __X__Not Applicable
SUBJECT:
UPDATE - UNPLANNED SHUTDOWN GREATER THAN 72 HOURS RESULTING FROM AUTOMATIC REACTOR TRIP DUE TO GROUND FAULT ON 345KV LINE DESCRIPTION:
On January 30, 2008, Florida Power & Light (FPL) Energy commenced a plant start-up of Seabrook Station and placed the generator on the grid on January 31, 2008, at 8:07 p.m. The plant had tripped off-line on January 19, at 11:02 p.m., when an electrical fault occurred on the 345 kV bus 3 between the main generator step-up transformer and the switchyard supply breakers. The plant was subsequently taken to cold shutdown on January 22, 2008, at 9:25 a.m.
FPL Energy determined that the event was caused by a faulted disconnect on the 345 kV bus.
The licensee completed repairs to the electrical disconnect and additional inspections in the switchyard to determine the extent of condition. No additional concerns were identified. FPL Energy also completed a post-trip review of the event, which included an evaluation of the emergency feedwater system response, the non-safety related electrical bus response and the trip of all four reactor coolant pumps during the automatic transfer to the alternate off-site power source. The company concluded that the equipment responded as designed.
Region I inspectors conducting reviews under the baseline inspection program independently determined that the protective functions and safety systems responded as expected. The NRC resident inspectors closely followed the licensees activities and observed plant restart activities.
The State of New Hampshire and the Commonwealth of Massachusetts were both informed of the event by the NRC.
The information presented herein has been discussed with FPL Energy, and is current as of 8:00 a.m., February, 1, 2008. Region I does not plan to provide any additional updates to this Preliminary Notification.
Region I Public Affairs is prepared to respond to media inquiries.
ADAMS ACCESSION NUMBER: ML080320162 CONTACTS:
Art Burritt William Raymond 610-337-5069 603-935-5151 alb1@nrc.gov wjr@nrc.gov
DISTRIBUTION: (PN Recipient List)
OWFN TWFN Chairman Klein Comm. Lyons NMSS Comm. Jazcko ACRS NRR RES OIP NSIR OCA OIG OGC EDO OE SECY Regional Offices BY FAX:
Dot: Trans INPO NSAC RI Resident Office Licensee: FPL Energy Seabrook, LLC Seabrook Station ML080320162 SUNSI Review Complete ALB (Reviewers Initials)
DOCUMENT NAME: G:\DRP\PNs\PNO-I-08-001A .doc After declaring this document An Official Agency Record it will be released to the Public.
To receive a copy of this document, indicate in the box: "C" = Copy without attachment/enclosure "E" = Copy with attachment/enclosure "N" = No copy OFFICE RI/DRP RI/ORA RI/ORA RI/ORA RI/DRP NAME ABurritt/ALB RBarkley/RSB MMcLaughlin/NTM DScrenci/DPS DLew/DCL DATE 01 / 29 /08 01 /30 /08 01 / 30/08 01 /30 /08 01 /30 /08 OFFICIAL RECORD COPY