ENS 43269
ENS Event | |
|---|---|
14:45 Apr 1, 2007 | |
| Title | Tech Spec Required Shutdown Due to Edg Inoperability |
| Event Description | During post-maintenance operability testing, Diesel Generator 4 exhibited unstable power output while synchronized to the grid. This testing was being performed at the conclusion of a planned Diesel Generator 4 maintenance outage. Preventive maintenance activities included in this scheduled outage included replacement of various relays in the Diesel Generator control logic and replacement of the engine governor.
Brunswick Nuclear Plant Unit 1 is commencing a unit shutdown as required by Technical Specification 3.8.1 Condition H due to the inoperability of Diesel Generator 4 lasting longer than seven (7) days. TS 3.8.1 Required Action H.1 requires Unit 1 to be in MODE 3 by 1615 on 4/1/2007 and in MODE 4 by 1615 on 4/2/2007. This event is reportable per 10CFR50.72(b)(2)(i). Power reduction was commenced at 1045 in accordance with station procedures for unit shutdown. Power level has been reduced from 100% to 53%. Unit 1 shutdown will continue until the unit is in MODE 4 or until the engine is declared operable following appropriate repairs and testing. Unit 2 is in MODE 4, Cold Shutdown. The inoperable Diesel Generator 4 is not needed to meet the requirements of Unit 2 Technical Specification 3.8.2. The inoperability of Diesel Generator 4 is of minimal safety significance for Unit 1. Unit 1 has two operable off-site circuits and three (3) Diesel Generators are operable. The remaining three (3) operable Diesel Generators and off-site circuits are adequate to supply electrical power to the on-site Class 1 E Distribution System. This maintains the safety function of the AC sources. Unit 1 is being shutdown to place the unit in MODE 4 where the inoperable Diesel Generator 4 is not required. Unit 2 is currently in MODE 4 and does not require Diesel Generator 4 to be operable. As such, this event is of zero safety significance for Unit 2. During post-maintenance operability testing, Diesel Generator 4 exhibited unstable power output while synchronized to the grid. Station engineering and a vendor representative continue to evaluate the engine/generator performance. Repair plans will be developed and implemented as appropriate following completion of the engineering evaluation. The inoperability of Diesel Generator 4 will prevent Unit 2 from changing mode for returning the plant to service. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Brunswick  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-1.83 h-0.0763 days <br />-0.0109 weeks <br />-0.00251 months <br />) | |
| Opened: | Michael Potter 12:55 Apr 1, 2007 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Apr 1, 2007 |
| 43269 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (53 %) |
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 | |