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 Issue dateTitleTopic
ML19353A40919 December 2019Technical Specification 5.6.8 Special Report: Inoperable Containment Isolation Valve Indication Supplemental ReportLocked High Radiation Area
05000306/LER-2017-00311 January 2018Both Containment SEa) Pump Control Switches in Pull-out in Mode 4
LER 17-003-00 for Prairie Island Nuclear Generating Plant, Unit 2 Regarding Both Containment Spray Pump Control Switches in Pull-Out in Mode 4
05000306/LER-2017-00211 December 2017Reactor Coolant System Shutdown Communication Live Vent Through Wall Defect
LER 17-002-00 for Prairie Island, Unit 2, Regarding Reactor Coolant System Shutdown Communication Live Vent Through Wall Defect
Boric Acid
Non-Destructive Examination
Pressure Boundary Leakage
Pressure boundary leak
Through Wall Leak
05000306/LER-2017-00129 November 201723 Containment Fan Coil Unit Operability
LER 17-001-00 for Prairie Island, Unit 2, Regarding 23 Containment Fan Coil Unit Operability
Unanalyzed Condition
05000282/LER-2016-00615 February 2017121 Motor Driven Cooling Water Pump Auto Start
LER 16-006-00 for Prairie Island Nuclear Generating Plant, Units 1 and 2 Regarding 121 Motor Driven Cooling Water Pump Auto Start
05000306/LER-2015-00222 June 201621 Feedwater Pump Lockout, Unit 2 Reactor Trip Due to Pressure Switch Failure
LER 15-002-01 for Prairie Island, Unit, Regarding 21 Feedwater Pump Lockout, Reactor Trip Due to Pressure Switch Failure
05000282/LER-2016-00421 June 20161 OF 4
LER 16-004-00 for Prairie Island, Unit 1, Regarding Missing Fire Barrier Between Fire Area (FA) 59 and 85 / Fire Hazard Analysis Drawings Do Not Match Boundary Description
Safe Shutdown
Unanalyzed Condition
Time of Discovery
Fire Barrier
Fire Watch
05000282/LER-2016-00225 March 2016Listed System Actuation - Motor-Driven Cooling Water Pump Auto-Start
LER 16-002-00 for Prairie Island, Unit 1, Regarding Listed System Actuation - Motor-Driven Cooling Water Pump Auto-Start
Ultimate heat sink
05000306/LER-2016-00112 February 2016Unit 2 Reactor Trip due to a Ground Fault resulting in a Generator Trip
LER 16-001-00 for Prairie Island, Unit 2, Regarding Reactor Trip Due to a Ground Fault Resulting in a Generator Trip
L-PI-15-071, Cancellation of License Event Report (LER)50-282/2015-001-00, 14 Fan Coil Unit Leak3 September 2015Cancellation of License Event Report (LER)50-282/2015-001-00, 14 Fan Coil Unit Leak
L-PI-11-023, Reinstatement of Licensee Event Reports Associated with Flooding Scenarios31 March 2011Reinstatement of Licensee Event Reports Associated with Flooding ScenariosUnanalyzed Condition
L-PI-07-101, LER 07-03-001 for Prairie Island, Unit 1 Regarding Unanalyzed Condition Due to Breached Fire Barrier25 January 2008LER 07-03-001 for Prairie Island, Unit 1 Regarding Unanalyzed Condition Due to Breached Fire BarrierSafe Shutdown
Unanalyzed Condition
Fire Barrier
Temporary Modification
Fire Protection Program
L-PI-06-046, Cancellation of Licensee Event Report (LER) 1-05-01, Discovery of Single Failure Vulnerability of Unit 1 Safeguards Buses9 June 2006Cancellation of Licensee Event Report (LER) 1-05-01, Discovery of Single Failure Vulnerability of Unit 1 Safeguards BusesHot Short