WEEKMONTHYEARENS 578102025-07-13T18:18:00013 July 2025 18:18:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip
ENS 575002025-01-17T07:03:00017 January 2025 07:03:00
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 574852025-01-04T13:55:0004 January 2025 13:55:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Inoperability of Both Trains of the Control Room Emergency Air Temperature Control System (CREATCS)
ENS 574382024-11-23T00:37:00023 November 2024 00:37:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Control Room Emergency Air Temperature Control System Inoperable
ENS 572142024-07-08T19:21:0008 July 2024 19:21:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip
ENS 571262024-05-13T13:17:00013 May 2024 13:17:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Inoperability of Both Trains of Unit 2 Low Head Safety Injection
ENS 570062024-03-05T06:32:0005 March 2024 06:32:00
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 569702024-02-16T03:24:00016 February 2024 03:24:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Actuation of Emergency Diesel Generator System
ENS 569352024-01-28T02:41:00028 January 2024 02:41:00
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 566602023-08-04T21:46:0004 August 2023 21:46:00
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 565932023-06-27T20:26:00027 June 2023 20:26:00
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 551182021-03-01T20:11:0001 March 2021 20:11:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Main Control Room Inoperable Due to Mcr Door Being Ajar
ENS 549972020-11-15T06:44:00015 November 2020 06:44:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Actuation of the Emergency Diesel Generators
ENS 547812020-07-15T12:35:00015 July 2020 12:35:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Main Control Room Envelope Inoperable Due to Mcr Door Being Ajar
ENS 547202020-05-20T09:21:00020 May 2020 09:21:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Actuation of Emergency Diesel Generators
ENS 547182020-05-19T17:29:00019 May 2020 17:29:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Control Room Envelope Inoperable
ENS 543912019-11-16T04:53:00016 November 2019 04:53:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Temporary Loss of Control Room Envelope Boundary
ENS 543902019-11-16T03:34:00016 November 2019 03:34:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Temporary Loss of Control Room Envelope Boundary
ENS 542522019-09-01T00:55:0001 September 2019 00:55:00
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 Steam Generator Level Control
ENS 541272019-06-20T17:40:00020 June 2019 17:40:00
10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Inoperability of Containment Shield Building
ENS 541122019-06-12T12:49:00012 June 2019 12:49:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Loss of Control Room Emergency Air Temperature Control System
ENS 540772019-05-22T06:33:00022 May 2019 06:33:00
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 Failure of Main Feedwater Regulating Valve
ENS 540212019-04-23T06:32:00023 April 2019 06:32:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Temporary Loss of Control Room Envelope Boundary
ENS 536972018-10-27T04:00:00027 October 2018 04:00:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip Following Startup
ENS 535932018-09-11T04:00:00011 September 2018 04:00:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Control Room Emergency Ventilation System Inoperable
ENS 535572018-08-22T04:00:00022 August 2018 04:00:00
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 534672018-06-22T04:00:00022 June 2018 04:00:00
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 533982018-05-11T14:11:00011 May 2018 14:11:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Containment Shield Building Inoperable
ENS 533272018-04-12T13:20:00012 April 2018 13:20:00
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 532912018-03-26T22:39:00026 March 2018 22:39:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Temporary Loss of Control Room Envelope Boundary
ENS 532882018-03-26T14:58:00026 March 2018 14:58:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Temporary Loss of Control Room Envelope Boundary
ENS 531962018-02-04T09:45:0004 February 2018 09:45:00
10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Failure of Containment Penetration Thermal Relief Check Valves to Meet Surveillance Acceptance Criteria
ENS 531732018-01-18T01:02:00018 January 2018 01:02:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Shield Building Inoperable
ENS 531322017-12-20T15:40:00020 December 2017 15:40:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
System Actuations Due to Opening of Feeder Breaker to Shutdown Board
ENS 531122017-12-11T13:57:00011 December 2017 13:57:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip in Response to Indication of Multiple Dropped Control Rods
ENS 530442017-10-30T13:42:00030 October 2017 13:42:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Temporary Loss of Control Room Envelope Boundary
ENS 529122017-08-17T16:05:00017 August 2017 16:05:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Actuation of Turbine Driven Auxiliary Feedwater Pump Due to Loss of 6.9Kv Shutdown Board
ENS 528722017-07-25T08:28:00025 July 2017 08:28:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip Due to Rod Position Indication System Being Inoperable
ENS 528082017-06-15T16:19:00015 June 2017 16:19:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Temporary Loss of Shield Building
ENS 527322017-05-04T21:09:0004 May 2017 21:09:00
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 Failed Reactor Coolant Pump Power Transfer
ENS 527252017-05-02T23:45:0002 May 2017 23:45:00
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 Failed Reactor Coolant Pump Power Transfer
ENS 526692017-04-06T20:20:0006 April 2017 20:20:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Temporary Loss of Control Room Envelope Boundary
ENS 526302017-03-23T04:14:00023 March 2017 04:14:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Start of Auxiliary Feed Water
ENS 526252017-03-20T12:13:00020 March 2017 12:13:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip as a Result of Secondary Plant Transient
ENS 526182017-03-09T06:20:0009 March 2017 06:20:00
10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Containment Airlock Function Lost Due to Equalizing Valve Not Closing
ENS 522102016-08-31T01:20:00031 August 2016 01:20:00
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
Notice of Unusual Event - Fire in a Main Bank Transformer
ENS 521942016-08-23T17:56:00023 August 2016 17:56:00
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 a Loss of Main Feedwater
ENS 521772016-08-13T07:36:00013 August 2016 07:36:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Start of Turbine Driven Auxiliary Feed Water Pump
ENS 520262016-06-20T19:40:00020 June 2016 19:40:00
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 519822016-06-05T16:27:0005 June 2016 16:27:00
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)(iv)(A), System Actuation - ECCS Discharge
Reactor Trip and Eccs Actuation Caused by Turbine Governor Valve Failure
ENS 519402016-05-17T20:30:00017 May 2016 20:30:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Specified System Actuation - Loss of 1 B-B Electrical Buss
ENS 518152016-03-22T15:31:00022 March 2016 15:31:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Watts Bar Automatic Reactor Trip
ENS 517952016-03-17T05:15:00017 March 2016 05:15:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Loss of Emergency and Auxiliary Gas Treatment Systems
ENS 508392015-02-21T15:32:00021 February 2015 15:32:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip Inserted Due to Rapid Loss of Main Condenser Vacuum
ENS 502782014-07-13T23:37:00013 July 2014 23:37:00
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 Automatic Feedwater Heater Isolation
ENS 498182014-02-11T23:00:00011 February 2014 23:00:00
10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
Nonconservative Operator Manual Actions Identified in Appendix R Analysis
ENS 495412013-11-14T21:00:00014 November 2013 21:00:00
10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Postulated Fire Induced Failure of Centrifugal Charging Pumps
ENS 491542013-06-28T17:30:00028 June 2013 17:30:00
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 Offsite Electrical Fault
ENS 489952013-05-03T05:11:0003 May 2013 05:11:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Temporary Loss of Both Trains of Emergency Gas Treatment System
ENS 484142012-10-17T03:30:00017 October 2012 03:30:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
All Four Emergency Diesel Generators Auto-Start on Valid Undervoltage Signal
ENS 482382012-08-28T07:32:00028 August 2012 07:32:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip Following Failure of a Feedwater Regulating Valve
ENS 469022011-05-29T05:55:00029 May 2011 05:55:00
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 464182010-11-14T11:52:00014 November 2010 11:52:00
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 Cooling to the 'A' Phase Main Bank Transformer
ENS 461772010-08-15T19:24:00015 August 2010 19:24:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Valid Aux Feedwater System Actuation During Power Reduction for Turbine Maintenance
ENS 459442010-05-21T23:37:00021 May 2010 23:37:00
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
ENS 452102009-07-17T21:42:00017 July 2009 21:42:00
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Actuation of Emergency Diesel Generators Due to Loss of Power to Safety Related Bus
ENS 451702009-06-27T17:20:00027 June 2009 17:20:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Auxiliary Building Gas Treatment System Rendered Inoperable
ENS 451102009-05-27T23:05:00027 May 2009 23:05:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Both Trains of Auxiliary Building Gas Treatment System Rendered Inoperable
ENS 445062008-09-20T13:06:00020 September 2008 13:06:00
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 Turbine Trip
ENS 443882008-08-07T06:28:0007 August 2008 06:28:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Trip from 50% Power Following Low Pressure Heater String Isolation
ENS 440852008-03-21T13:13:00021 March 2008 13:13:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
System Injection Determined Inoperable by Failure to Remove Electrical Jumper Prior to Mode Change
ENS 427442006-07-31T16:13:00031 July 2006 16:13:00
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 Trip
ENS 426102006-05-30T21:00:00030 May 2006 21:00:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip on High Turbine Vibration
ENS 410542004-09-19T08:56:00019 September 2004 08:56:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip in Response to Indication of Dropped Control Rods
ENS 404542004-01-16T16:37:00016 January 2004 16:37:00
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 402212003-10-03T19:16:0003 October 2003 19:16:00
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Accident Mitigation System Degraded Due to Both Trains of Auxiliary Building Gas Treatment System Inoperable
ENS 401002003-08-25T13:45:00025 August 2003 13:45:00
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Turbine Trip/Reactor Trip Due to a Sudden Pressure Relay Signal from Main Transformer Bank "1C
2025-07-13T18:18:00
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