ENS 45728
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ENS Event | |
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01:35 Feb 26, 2010 | |
Title | Technical Specification Required Shutdown Due to Rhr Inoperability |
Event Description | At 1840 on 2/25/10, Unit 2 RHR Division II became inoperable due to exceeding 260 degrees F on the injection line. The temperature is elevated due to leakage past the injection line check valve (2-CKV-74-68) and the inboard injection valve (2-FCV-74-67). The 260 degree F value is based on engineering calculations to ensure the injection line does not become steam voided. RHR Division I was already inoperable for scheduled maintenance when this condition occurred. Entered TS LCO 3.0.3 based on TS LCO 3.5.1 Condition H - Two or more Low pressure ECCS injection/spray subsystems inoperable for reasons other than Condition A.
Action was taken to lower power at 1935 when the conditions requiring entry into LCO 3.0.3 could not be corrected. Tech Spec LCO 3.0.3 was exited at 2000 when RHR Loop II system pressure was raised using an alternate keep fill flow path to ensure that the injection line would remain filled. Power will be returned to 100%. 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 in accordance with 10 CFR 50.72(b)(2)(i). The licensee informed the NRC Resident Inspector. |
Where | |
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Browns Ferry Alabama (NRC Region 2) | |
Reporting | |
10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
Time - Person (Reporting Time:+-1.97 h-0.0821 days <br />-0.0117 weeks <br />-0.0027 months <br />) | |
Opened: | Joe Bennett 23:37 Feb 25, 2010 |
NRC Officer: | Joe O'Hara |
Last Updated: | Feb 25, 2010 |
45728 - NRC Website
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Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (95 %) |
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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