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| Start date | Site | Title | |
|---|---|---|---|
| ENS 56928 | 18 January 2024 20:04:00 | Columbia | Residual Heat Removal Degraded Due to Service Water Leakage |
| ENS 56570 | 13 June 2023 03:33:00 | Fermi | Accident Mitigation - High Pressure Coolant Injection Declared Inoperable |
| ENS 56542 | 25 May 2023 04:00:00 | Fermi | Part 21 Interim Evaluation - Mechanical Draft Cooling Tower Fan Brakes Design Flaw |
| ENS 56429 | 23 March 2023 15:45:00 | Fermi | Design Flaw Discovered in Mechanical Draft Cooling Tower Fan Brakes |
| ENS 56284 | 23 December 2022 20:13:00 | Davis Besse | Technical Specification Required Shutdown |
| ENS 56241 | 28 November 2022 09:00:00 | Fermi | High Pressure Coolant Injection System Inoperable |
| ENS 56054 | 18 August 2022 01:08:00 | Fermi | Safety System Inoperability |
| ENS 56023 | 30 July 2022 03:17:00 | Dresden | RHR Capability Lost Due to Suction Bay Level |
| ENS 54931 | 6 August 2020 06:28:00 | Browns Ferry | 60-Day Optional Telephonic Notification of an Invalid Specified System Actuation |
| ENS 54701 | 14 March 2020 19:44:00 | Palo Verde | Invalid Actuation of Spray Pond Pump System - 60 Day Reports |
| ENS 54188 | 30 July 2019 14:14:00 | Fermi | Unplanned High Pressue Coolant Injection Inoperability |
| ENS 53772 | 4 December 2018 14:35:00 | Fermi | En Revision Imported Date 1/31/2019 |
| ENS 53559 | 14 August 2018 05:00:00 | Waterford | Part 21 Report - Defect of Westinghouse 7300 Process Analog Control System Circuit Cards |
| ENS 53537 | 3 August 2018 04:00:00 | Fermi | High Pressure Coolant Injection Declared Inoperable |
| ENS 53485 | 3 July 2018 05:00:00 | Callaway | En Revision Imported Date 8/1/2018 |
| ENS 53083 | 6 October 2017 14:10:00 | LaSalle | Invalid Specified System Actuation |
| ENS 52958 | 9 September 2017 14:00:00 | Fermi | Mechanical Draft Cooling Tower Fans Declared Inoperable |
| ENS 52214 | 31 August 2016 23:50:00 | Fermi | Unanalyzed Condition with a Potential Tornado |
| ENS 52202 | 25 August 2016 20:29:00 | Fermi | Mechanical Draft Cooling Tower Declared Inoperable |
| ENS 52201 | 25 August 2016 20:23:00 | Fort Calhoun | Unanalyzed Condition Involving Potential Tornado Missile Damage |
| ENS 52228 | 12 July 2016 12:50:00 | Palo Verde | Invalid Actuation of Both Trains Essential Spray Pond System |
| ENS 51847 | 4 April 2016 17:30:00 | Limerick | Offsite Notification Due to Cooling Tower Water Released to a Non-Permitted Outfall |
| ENS 50792 | 6 February 2015 18:27:00 | Dresden | Automatic Reactor Scram Due to Loss of Feedwater |
| ENS 50752 | 22 January 2015 22:45:00 | Calvert Cliffs | Unanalyzed Heat Exchanger Lineup Could Exceed Design Basis Temperatures |
| ENS 50378 | 18 August 2014 13:53:00 | Waterford | Ultimate Heat Sink System Inoperable |
| ENS 50324 | 30 July 2014 14:40:00 | River Bend | Ultimate Heat Sink in an Unanalyzed Condition |
| ENS 50287 | 20 July 2014 18:54:00 | Turkey Point | Ultimate Heat Sink Temperature Exceeded Technical Specification Limit |
| ENS 50227 | 25 June 2014 20:55:00 | Braidwood | Potential Loss of Ultimate Heat Sink Capacity Due to Low Level |
| ENS 49326 | 5 September 2013 21:00:00 | Waterford | Loss of Auxiliary Component Cooling Water Systems |
| ENS 48615 | 26 October 2012 04:08:00 | Palo Verde | 60-Day Optional Telephonic Notification for an Invalid Actuation of the Essential Spray Pond System |
| ENS 48181 | 12 August 2012 04:44:00 | Millstone | Technical Specification Required Shutdown Due to Ultimate Heat Sink Exceeding Temperature Limit |
| ENS 47587 | 4 December 2011 12:09:00 | Clinton | Invalid Actuation of Containment Isolation Signals and an Emergency Service Water Pump |
| ENS 47446 | 13 September 2011 14:00:00 | North Anna | Early Site Permit Postulated Seismic Acceleration Is Less than Projected Based on New Information |
| ENS 47054 | 15 July 2011 15:16:00 | Dresden | Alert Declared Due to Toxic Gas Release Restricting Access to a Vital Area |
| ENS 46171 | 13 August 2010 00:52:00 | LaSalle | Technical Specification Required Shutdown Due to Environmental Conditions Resulting in Elevated Ultimate Heat Sink Temperature |
| ENS 45343 | 11 September 2009 05:00:00 | Sargent & Lundy Llc | Problem with Seismic Soil Structure Analysis Software |
| ENS 44562 | 11 October 2008 09:45:00 | Turkey Point | Unanalyzed Condition Due to Vendor Calculation Error |
| ENS 44051 | 24 January 2008 07:35:00 | Catawba | 60 Day Report - Invalid Actuation of the Nuclear Service Water System |
| ENS 43735 | 19 October 2007 23:30:00 | Byron | Tech Spec Required Shutdown Due to Ultimate Heat Sink Inoperability |
| ENS 43498 | 27 June 2007 12:28:00 | Three Mile Island | Failed Relay Starts One Train of the Decay Heat River Water System |
| ENS 42867 | 9 August 2006 14:51:00 | Browns Ferry | Invalid Eecw Pump Actuation During Testing |
| ENS 42405 | 11 March 2006 06:30:00 | LaSalle | Unanalyzed Condition |
| ENS 40639 | 3 April 2004 15:50:00 | Salem | Valid Actuation of Auxiliary Feedwater System During Maintenance |