WEEKMONTHYEARENS 552722021-05-24T13:16:00024 May 2021 13:16:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
on 5/24/21 at 0916 Edt, an Automatic Reactor Trip on Unit 1 Occurred. All Safety Systems Responded Normally and the Plant Is Currently Stable in Mode 3 (Hot Standby) at Normal Operating Temperature and Pressure. Preliminary Indications Are That the Unit Trip Was Caused by a High Neutron Flux Rate Detected by the Power Range Nuclear Instruments. Troubleshooting and Investigation Are Ongoing to Determine the Initiating Cause.
ENS 544462019-12-16T08:58:00016 December 2019 08:58:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Emergency Diesel Generator Autostart Due to Loss of Power to 1B Shutdown Board
ENS 544382019-12-12T09:33:00012 December 2019 09:33:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
ENS 542422019-08-27T05:09:00027 August 2019 05:09:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip
ENS 539992019-04-14T07:20:00014 April 2019 07:20:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
En Revision Imported Date 8/7/2019
ENS 527692017-05-24T03:30:00024 May 2017 03:30:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
All Four Edgs Autostarted During Transfer of Shutdown Board to Normal Power Source for Unit 2 Testing
ENS 524692016-12-30T18:05:00030 December 2016 18:05:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip Due to Control Rod Not Withdrawing as Expected
ENS 517202016-02-09T19:15:0009 February 2016 19:15:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge
Eccs Discharge to Rcs Via Charging System
ENS 515592015-11-23T13:44:00023 November 2015 13:44:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip After Partial Msiv Closure
ENS 513922015-09-14T08:26:00014 September 2015 08:26:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip Due to Loss of Power to Vital Instrument Board
ENS 512652015-07-27T14:43:00027 July 2015 14:43:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor/Turbine Trip
ENS 512592015-07-24T17:51:00024 July 2015 17:51:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip Due to Turbine Trip on Main Generator Lockout
ENS 508782015-03-11T10:21:00011 March 2015 10:21:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip Due to a Nuclear Instrumentation Signal
ENS 508562015-03-02T11:45:0002 March 2015 11:45:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip
ENS 487782013-02-24T17:05:00024 February 2013 17:05:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip Due to Loss of Condenser Vacuum Indication
ENS 481982012-08-16T23:26:00016 August 2012 23:26:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Reactor Trip from a Reactor Coolant Pump Trip
ENS 471692011-08-19T02:50:00019 August 2011 02:50:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip Due to Reactor Coolant Pump Bus Undervoltage
ENS 470812011-07-21T01:29:00021 July 2011 01:29:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip Due to Negative Rate Trip Following Rapid Turbine Load Reduction
ENS 469912011-06-26T20:14:00026 June 2011 20:14:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip Due to Turbine Trip
ENS 464922010-12-20T05:50:00020 December 2010 05:50:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip Due to a Fire in the Main Generator Bus Duct
ENS 464242010-11-17T03:10:00017 November 2010 03:10:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip Based on Decreasing Steam Generator Level
ENS 455202009-11-26T07:42:00026 November 2009 07:42:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Trip Due to Loss of Vacuum on Turbine Driven Feedwater Pump
ENS 450972009-05-27T23:04:00027 May 2009 23:04:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Reactor Trip from Power Range High Neutron Flux Rate
ENS 450452009-05-07T02:56:0007 May 2009 02:56:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip Due to Feed Regulating Valve Failure
ENS 450292009-04-29T01:59:00029 April 2009 01:59:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip Initiated as a Result of a Loss of Condensate Flow
ENS 449352009-03-26T08:52:00026 March 2009 08:52:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip and Aux Feed Water Start Due to Loss of an Off Site Power Source
ENS 449342009-03-26T08:52:00026 March 2009 08:52:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip and Aux Feed Water Start Due to Loss of an Off Site Power Source
ENS 446492008-11-09T23:21:0009 November 2008 23:21:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Reactor Trip Breakers Opened Manually Due to Indicated Dropped Control Rod
ENS 446272008-11-04T04:22:0004 November 2008 04:22:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
Manual Reactor Trip Due to Feedwater Reg Valve Failure
ENS 439092008-01-17T00:25:00017 January 2008 00:25:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip Due to Lowering Steam Generator Level
ENS 432332007-03-13T19:27:00013 March 2007 19:27:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip Due to "a" Main Feedwater Pump
ENS 431152007-01-23T17:44:00023 January 2007 17:44:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Reactor Trip Due to Feedwater Regulating Valve Failure
ENS 424442006-03-22T21:24:00022 March 2006 21:24:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Turbine Trip / Reactor Trip Caused by Main Generator Trip
ENS 415832005-04-09T15:11:0009 April 2005 15:11:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip on Turbine Trip Due to Low Auto Stop Oil Pressure on Pressure Switches
ENS 414372005-02-24T02:06:00024 February 2005 02:06:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip on Low-Low Steam Generator Level
ENS 405892004-03-15T20:18:00015 March 2004 20:18:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip Due to Main Generator Electrical Fault Signal
ENS 404752004-01-25T08:16:00025 January 2004 08:16:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Unplanned Auto Start of Turbine Driven Auxiliary Feedwater Pump
ENS 403052003-11-10T04:15:00010 November 2003 04:15:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Sequoyah Unit 2 Auxiliary Feedwater Actuation During Outage
ENS 401132003-08-28T20:04:00028 August 2003 20:04:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Alert Declared Due to Reactor Protection System Failure
2021-05-24T13:16:00
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