ENS 51231
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ENS Event | |
|---|---|
22:15 Jul 14, 2015 | |
| Title | Technical Specification Required Shutdown |
| Event Description | At 1810 (Central Daylight Time) on July 14, 2015, Browns Ferry Units 1, 2, and 3 initiated actions to commence a reactor shutdown to comply with TS [Technical Specifications] LCO 3.0.3. TS LCO 3.0.3 was entered at 1715 (Central Daylight Time) due to concurrent losses of the A and B Control Bay Chillers. This resulted in a loss of cooling to the U1 and U2 4kV Shutdown Board Rooms. Required actions for the loss of cooling to the U1 and U2 4kV Shutdown Board Rooms are to declare the electrical equipment in the 4kV Shutdown Board Rooms inoperable. The declaration of inoperability of the equipment supported by the U1 and U2 4kV Shutdown Boards resulted in TS LCO 3.0.3 for Units 1, 2, and 3. TS LCO 3.0.3 requires actions to be initiated within one hour to place the affected units 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-hour report in accordance with 50.72(b)(2)(i), 'The initiation of any nuclear plant shutdown required by the plant's Technical Specifications.' The NRC Resident Inspector has been notified. Condition Report #1056829 has been initiated in the Corrective Action Program. The 4kV shutdown electrical boards are required in all modes of operation. |
| Where | |
|---|---|
Browns Ferry  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| LER: | 05000259/LER-2015-003 |
| Time - Person (Reporting Time:+0.73 h0.0304 days <br />0.00435 weeks <br />9.99954e-4 months <br />) | |
| Opened: | Michael Brooks 22:59 Jul 14, 2015 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Jul 14, 2015 |
| 51231 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (99 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (99 %) |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (99 %) |
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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