ENS 42960
ENS Event | |
|---|---|
23:53 Nov 2, 2006 | |
| Title | Technical Specification Shutdown |
| Event Description | 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 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. 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 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and Required Action H.2 to be in MODE 4 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. 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 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />, Mode 3 within 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br />, and Mode 4 within 37 hours4.282407e-4 days <br />0.0103 hours <br />6.117725e-5 weeks <br />1.40785e-5 months <br />. 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. |
| Where | |
|---|---|
Brunswick  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-1.67 h-0.0696 days <br />-0.00994 weeks <br />-0.00229 months <br />) | |
| Opened: | Joel P. Leviner 22:13 Nov 2, 2006 |
| NRC Officer: | John Mackinnon |
| Last Updated: | Nov 2, 2006 |
| 42960 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (99 %) |
WEEKMONTHYEARENS 546032020-03-24T16:05:00024 March 2020 16:05:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification-Required Shutdown Due to Unidentified Leakage ENS 539612019-03-28T18:50:00028 March 2019 18:50:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unusual Event Declared Due to Rcs Unidentified Leakage ENS 476872012-02-23T01:14:00023 February 2012 01:14:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Inoperability of Emergency Core Cooling Systems ENS 453682009-09-20T18:00:00020 September 2009 18:00:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Inoperability of Diesel Generator ENS 432692007-04-01T14:45:0001 April 2007 14:45:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech Spec Required Shutdown Due to Edg Inoperability ENS 429602006-11-02T23:53:0002 November 2006 23:53:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Shutdown ENS 418952005-08-05T22:40:0005 August 2005 22:40:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Inoperability of All Emergency Diesel Generators ENS 416922005-05-12T08:11:00012 May 2005 08:11:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.73(a)(1), Submit an LER Technical Specification Required Shutdown Due to Loss of Emergency Bus E1 ENS 409052004-07-29T13:42:00029 July 2004 13:42:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Plant Entered Lco Action Statement Due to Malfunction of a Suppression Chamber-To-Drywell Vacuum Breaker. 2020-03-24T16:05:00 | |