ENS 50265
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ENS Event | |
|---|---|
09:45 Jul 10, 2014 | |
| Title | Technical Specification Required Shutdown |
| Event Description | At 0445 [CDT] on July 10, 2014, Browns Ferry Unit 2 initiated actions to commence a reactor shutdown to comply with TS LCO 3.0.3. TS LCO 3.0.3 was entered at 0355 [CDT] and was required due to the 'C' Emergency Diesel Generator becoming inoperable after isolating a leak on the Emergency Equipment Cooling Water System. Currently, a 7 day TS LCO Action 3.5.1.A is in effect due to ongoing scheduled Core Spray Loop I maintenance outage. The declaration of inoperability of the equipment supported by the 'C' Emergency Diesel Generator, Core Spray Loop II, along with the redundant Core Spray system inoperable for maintenance resulted in TS LCO 3.0.3 for Unit 2. TS LCO 3.0.3 requires actions to be initiated within one hour; to place the unit in MODE 2 within 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-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 />.
This event requires a 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> report lAW 50.72(b)(2)(i), 'The initiation of any nuclear plant shutdown required by the plant's Technical Specifications.' Actions were taken to restore the Core Spray System to Operable status and LCO 3.0.3 was exited at 0735 [CDT] on July 10, 2014. The NRC Resident Inspector has been notified. This event was entered into the Corrective Action Program. Browns Ferry Unit 2 had reduced power to 98% when LCO 3.0.3 was exited, the power reduction was suspended, and preparations are being made to return power to 100%. There is no impact on Units 1 or 3. |
| Where | |
|---|---|
Browns Ferry  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-0.47 h-0.0196 days <br />-0.0028 weeks <br />-6.43806e-4 months <br />) | |
| Opened: | Wesley Conkle 09:17 Jul 10, 2014 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Jul 10, 2014 |
| 50265 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (98 %) |
WEEKMONTHYEARENS 536782018-10-21T05:00:00021 October 2018 05:00:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Shut Down Due to Chemistry Limit Exceeded ENS 512312015-07-14T22:15:00014 July 2015 22:15:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown ENS 502652014-07-10T09:45:00010 July 2014 09:45:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown ENS 502072014-06-17T22:29:00017 June 2014 22:29:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Shutdown Due to Loss of a and B Control Bay Chiller Trains ENS 488222013-03-14T13:00:00014 March 2013 13:00:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unit 2 Shutdown Required by Technical Specifications Due to Inoperable Rcic ENS 487822013-02-25T19:13:00025 February 2013 19:13:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Automatic Scram Due to a Turbine Trip from a Loss of Condenser Vacuum ENS 471302011-08-06T11:17:0006 August 2011 11:17:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Initiation of Technical Specification Required Shutdown ENS 467132011-03-30T20:42:00030 March 2011 20:42:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Initiated ENS 457282010-02-26T01:35:00026 February 2010 01:35:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Rhr Inoperability ENS 451242009-06-11T20:55:00011 June 2009 20:55:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unit 2 Initiated a Tech Spec Required Shutdown Due to a Rise in Unidentified Drywell Leakage ENS 418612005-07-22T08:16:00022 July 2005 08:16:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown T/S Shutdown Due to Dc Subsystem Declared Inoperable 2018-10-21T05:00:00 | |
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