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| Entered date | Event description | |
|---|---|---|
| ENS 42960 | 2 November 2006 22:13:00 | On 11/01/06 at approximately 18:23 (EST) Brunswick Unit 2 experienced a loss of the unit's Startup Auxiliary Transformer (SAT) and a loss of reactor forced circulation. Due to the loss of the SAT and subsequent manual reactor scram of Unit 2, a loss of Offsite Power resulted to the Unit 2 power buses. All four site Emergency Diesel Generators (EDGs) then started as designed. On 11/02/06 at approximately 0400 (EST) EDG no. 1 tripped on low lube oil pressure due to high differential pressure on the EDG lube oil strainer. The EDG was not loaded at the time of the trip. Due to the loss of one offsite qualified circuit (Unit 2 SAT) and the loss of one EDG (EDG 1), Unit 1 entered Technical Specification (TS) 3.8.1, Condition F, which requires restoration of the inoperable offsite circuit or restoration of the inoperable Diesel Generator within 12 hours. At 1600 on 11/02/06, Brunswick Unit 1 entered TS 3.8.1, Condition H, Required Action H.1 to be in MODE 3 in 12 hours and Required Action H.2 to be in MODE 4 within 36 hours. On 11/02/06 at 17:54 EDG 2 was declared inoperable due to being placed in manual for a required loaded run due to having been operated at no load for a period of time. Unit 1 entered Technical Specification 3.0.3 due to having EDG 1, EDG 2, and one offsite qualified circuit (Unit 2 SAT) inoperable. Per Technical Specification 3.0.3, action shall be initiated within one hour to place the unit in Mode 2 within 7 hours, Mode 3 within 13 hours, and Mode 4 within 37 hours. Unit 1 began a Technical Specification Required shutdown at 18:53 and is presently at 99% power. On 11/02/06 at 21:30, EDG 2 was declared operable following the loaded run and is presently in standby in the auto mode. Technical Specification 3.0.3 was exited at that time. Unit 1 remains in Technical Specification 3.8.1 Condition H at the present time. At 21:59, the NRC resident was notified of this event. |