Licensee Event Report

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If a criteria is reached according to NUREG-1022 then a Licensee to the NRC must submit a Licensee Event Report to explain what happened.

Reporting Criteria

Writing LERs

Explain exactly what happened during the entire event or condition, including how systems,components, and operating personnel performed. Do not cover specific hardware problems in excessive detail. Describe unique characteristics of a plant as well as other characteristics that influenced the event (favorably or unfavorably).

  • Avoid using plant-unique terms and abbreviations, or, as a minimum, clearly define them.
    • The audience for LERs is large and does not necessarily know the details of each plant.
  • Include the root causes, the plant status before the event, and the sequence of occurrences.
  • Describe the event from the perspective of the Operator (i.e., what the operator saw, did, perceived, understood, or misunderstood).
  • If several systems actuate during an event, describe all aspects of the complete event, including all actuations sequentially, and those aspects that by themselves would not be reportable.
    • For example, if a single component failure (generally not reportable) occurs following a reactor scram (reportable), describe the component failure in the narrative of the LER for the reactor scram.
  • It is necessary to discuss the performance and status of equipment.
  • Paraphrase pertinent sections of the latest submitted Safety analysis report (SAR) rather than referencing them because not all organizations or individuals have access to SARs.
  • Extensive cross-referencing would be time consuming considering the large number of LERs and reviewers that read each LER.
  • Ensure that each component's safety-significant effect on the event or condition is clearly and completely described.
  • Do not use statements such as "this event is not significant with respect to the health and safety of the public" without explaining the basis for the conclusion.

Specific information that should be included, as appropriate, is described in paragraphs 50.73(b).

Submissions of LERs

Section 50.73(d) of the NUREG-1022 states that submmissions must be done with Form NRC 366 as described by section 50.4. Submissions are to be done within 60 days of the event. If that happens to be a weekend or a holiday then it must be the next working day. If a Licensee knows that a report will be late or needs an additional day or so to complete the report, the situation should be discussed with the appropriate NRC regional office. See Section 2.5 for further discussion of discovery date.


LER Forwarding Letter and Cancellations

The cover letter forwarding an LER to the NRC should be signed by a responsible official. There is no prescribed format for the letter. The date the letter is issued and the report date should be the same. Licensees are encouraged to include the NRC resident inspector and the Institute of Nuclear Power Operations (INPO) in their distribution. Multiple LERs can be forwarded by one forwarding letter. Cancellations of LERs submitted should be made by letter. The letter should state that the LER is being canceled (i.e., formally withdrawn). The bases for the cancellation should be explained so that the staff can understand and review the reasons supporting the determination. The notice of cancellation will be filed and stored with the LER and acknowledgement made in various automated data systems. The LER will be removed from the LER data base.


Voluntary LERs

Indicate information-type LERS (i.e., Voluntary LERs) by checking the "Other" block in Item 11 of the LER form and type "Voluntary Report" in the space immediately below the block. Also give a sequential LER number to the voluntary report as noted in Section 5.2.4(5). Because not all requirements of 50.73(b), "Contents," may pertain to some voluntary reports, licensees should develop the content of such reports to best present the information associated with the situation being reported. See Section 2.7 for additional discussion of Voluntary LERs.

How To Find LERs

See also

LER list

by site

1 year

Site#CompanyEvent lists
Almaraz 0 Iberdrola [Almaraz events] [RSS]
Arkansas Nuclear 0 Entergy [Arkansas Nuclear events] [RSS]
Asco 0 Endesa [Asco events] [RSS]
Beaver Valley 0 FirstEnergy [Beaver Valley events] [RSS]
Belleville 0 Électricité de France [Belleville events] [RSS]
Big Rock Point 0 Consumers Energy [Big Rock Point events] [RSS]
Blayais 0 Électricité de France [Blayais events] [RSS]
Braidwood 0 Constellation [Braidwood events] [RSS]
Browns Ferry 0 Tennessee Valley Authority [Browns Ferry events] [RSS]
Brunswick 0 Duke Energy [Brunswick events] [RSS]
Byron 0 Constellation [Byron events] [RSS]
Callaway 0 Ameren [Callaway events] [RSS]
Calvert Cliffs 0 Constellation [Calvert Cliffs events] [RSS]
Catawba 0 Duke Energy [Catawba events] [RSS]
Chernobyl 0 [Chernobyl events] [RSS]
Clinton 0 Constellation [Clinton events] [RSS]
Cofrentes 0 Iberdrola [Cofrentes events] [RSS]
Columbia 0 Energy Northwest [Columbia events] [RSS]
Comanche Peak 0 Luminant [Comanche Peak events] [RSS]
Cook 0 American Electric Power [Cook events] [RSS]
Cooper 0 Entergy [Cooper events] [RSS]
Crystal River 0 Duke Energy [Crystal River events] [RSS]
Dampierre 0 Électricité de France [Dampierre events] [RSS]
Davis Besse 0 Cleveland Electric [Davis Besse events] [RSS]
Diablo Canyon 0 Pacific Gas & Electric [Diablo Canyon events] [RSS]
Dresden 0 Constellation [Dresden events] [RSS]
Duane Arnold 0 NextEra Energy [Duane Arnold events] [RSS]
Dungeness 0 EDF Energy [Dungeness events] [RSS]
Elk River 0 [Elk River events] [RSS]
Farley 0 Southern Nuclear [Farley events] [RSS]
Fermi 0 DTE Energy [Fermi events] [RSS]
FitzPatrick 0 Constellation [FitzPatrick events] [RSS]
Flamanville 0 Électricité de France [Flamanville events] [RSS]
Fort Calhoun 0 Omaha Public Power District [Fort Calhoun events] [RSS]
Fort Saint Vrain 0 Xcel Energy [Fort Saint Vrain events] [RSS]
Fukushima Dai-Ichi 0 TEPCO [Fukushima Dai-Ichi events] [RSS]
Ginna 0 Constellation [Ginna events] [RSS]
Grand Gulf 0 Entergy [Grand Gulf events] [RSS]
Haddam Neck 0 Connecticut Yankee Atomic Power Co [Haddam Neck events] [RSS]
Hallam 0 [Hallam events] [RSS]
Harris 0 Duke Energy [Harris events] [RSS]
Hartlepool 0 EDF Energy [Hartlepool events] [RSS]
Hatch 0 Southern Nuclear [Hatch events] [RSS]
Heysham 0 EDF Energy [Heysham events] [RSS]
Hinkley Point 0 EDF Energy [Hinkley Point events] [RSS]
Hope Creek 0 PSEG [Hope Creek events] [RSS]
Humboldt Bay 0 Pacific Gas and Electric [Humboldt Bay events] [RSS]
Hunterston 0 EDF Energy [Hunterston events] [RSS]
Indian Point 0 Entergy [Indian Point events] [RSS]
Jose Cabrera 0 Enresa [Jose Cabrera events] [RSS]
Kewaunee 0 Dominion [Kewaunee events] [RSS]
Khmelnytskyi 0 Energoatom [Khmelnytskyi events] [RSS]
La Crosse 0 Dairyland Power Cooperative [La Crosse events] [RSS]
LaSalle 0 Constellation [LaSalle events] [RSS]
Lee 0 Duke Energy [Lee events] [RSS]
Limerick 0 Constellation [Limerick events] [RSS]
Maine Yankee 0 Maine Yankee [Maine Yankee events] [RSS]
McGuire 0 Duke Energy [McGuire events] [RSS]
Millstone 0 Dominion [Millstone events] [RSS]
Monticello 0 Xcel Energy [Monticello events] [RSS]
Nine Mile Point 0 Constellation [Nine Mile Point events] [RSS]
Nogent 0 Électricité de France [Nogent events] [RSS]
North Anna 0 Dominion [North Anna events] [RSS]
Oconee 0 Duke Energy [Oconee events] [RSS]
Olkiluoto 0 Teollisuuden Voima [Olkiluoto events] [RSS]
Oyster Creek 0 Holtec [Oyster Creek events] [RSS]
Palisades 0 Entergy [Palisades events] [RSS]
Palo Verde 0 Arizona Public Service [Palo Verde events] [RSS]
Parr 0 [Parr events] [RSS]
Peach Bottom 0 Constellation [Peach Bottom events] [RSS]
Perry 0 FirstEnergy [Perry events] [RSS]
Pilgrim 0 Holtec [Pilgrim events] [RSS]
Point Beach 0 NextEra Energy [Point Beach events] [RSS]
Prairie Island 0 Xcel Energy [Prairie Island events] [RSS]
Quad Cities 0 Constellation [Quad Cities events] [RSS]
Rancho Seco 0 Sacramento Municipal Utility District [Rancho Seco events] [RSS]
River Bend 0 Entergy [River Bend events] [RSS]
Rivne 0 Energoatom [Rivne events] [RSS]
Robinson 0 Duke Energy [Robinson events] [RSS]
Saint Lucie 0 NextEra Energy [Saint Lucie events] [RSS]
Salem 0 PSEG [Salem events] [RSS]
San Onofre 0 Southern California Edison [San Onofre events] [RSS]
Santa Maria De Garona 0 Nuclenor [Santa Maria De Garona events] [RSS]
Saxton 0 GPU Nuclear [Saxton events] [RSS]
Seabrook 0 NextEra Energy [Seabrook events] [RSS]
Sequoyah 0 Tennessee Valley Authority [Sequoyah events] [RSS]
Shippingport 0 [Shippingport events] [RSS]
Shoreham 0 Long Island Lighting Company [Shoreham events] [RSS]
Sizewell 0 EDF Energy [Sizewell events] [RSS]
South Texas 0 STP Nuclear Operating Company [South Texas events] [RSS]
South Ukraine 0 Energoatom [South Ukraine events] [RSS]
Summer 0 South Carolina Electric & Gas Company [Summer events] [RSS]
Sundesert 0 San Diego Gas & Electric Compnay [Sundesert events] [RSS]
Surry 0 Dominion [Surry events] [RSS]
Susquehanna 0 Talen Energy [Susquehanna events] [RSS]
Taishan 0 China Guangdong Nuclear Power Group [Taishan events] [RSS]
Three Mile Island 0 Constellation [Three Mile Island events] [RSS]
Trillo 0 Iberdrola [Trillo events] [RSS]
Trojan 0 Portland General Electric [Trojan events] [RSS]
Turkey Point 0 NextEra Energy [Turkey Point events] [RSS]
Vandellos 0 Endesa [Vandellos events] [RSS]
Vermont Yankee 0 Entergy [Vermont Yankee events] [RSS]
Victoria 0 Exelon [Victoria events] [RSS]
Vogtle 0 Southern Nuclear [Vogtle events] [RSS]
Waterford 0 Entergy [Waterford events] [RSS]
Watts Bar 0 Tennessee Valley Authority [Watts Bar events] [RSS]
Wolf Creek 0 Wolf Creek Nuclear Operating Corporation [Wolf Creek events] [RSS]
Yankee Rowe 0 [Yankee Rowe events] [RSS]
Zaporizhzhia 0 Enerhodar [Zaporizhzhia events] [RSS]
Zion 0 ZionSolutions [Zion events] [RSS]
 SiteStart dateReporting criterionSystemTopic
05000318/LER-2023-004, Submittal of LER 2023-004-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Submittal of Automatic Reactor Trip from Reactor Protection System Actuation Due to Loss of Unit Service TransformerCalvert Cliffs16 January 2024Reactor Protection System
05000318/LER-2023-002, Forward LER 2023-002-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Automatic Reactor Trip from Reactor Protection System Actuation Due to Loss of Unit Service TransformerCalvert Cliffs8 January 2024Reactor Protection System
05000318/LER-2023-003, Forward LER 2023-003-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Manual Actuation of Auxiliary Feedwater System Due to 22 Steam Generator Feedwater Pump TripCalvert Cliffs8 January 2024Steam Generator
Feedwater
Auxiliary Feedwater
05000483/LER-2023-001, Submittal of LER 2023-001-00 for Callaway, Unit 1, Inoperable Instrument Tunnel Sump Level Indication Resulted in Condition Prohibited by Technical SpecificationsCallaway29 November 2023
05000457/LER-2023-001, Submittal of LER 2023-001-00 for Braidwood Station, Unit 2, Train B Auxiliary Feedwater Pump Was Inoperable Due to Degraded Oil in the Crank CaseBraidwood17 November 2023Auxiliary Feedwater
05000483/LER-2022-002, Forward LER 2022-002-00 for Callaway Plant, Unit 1, Containment Spray and Cooling Systems, and a Condition Which Could Have Prevented Fulfillment of the Safety Function of the Containment Spray System (Letter Only)Callaway18 August 2022Containment Spray
05000250/LER-2021-004, Cancelation of LER 2021-004, Through-Wall Leakage from Core Exit Thermocouple TubingTurkey Point28 March 2022Through-Wall Leakage
05000318/LER-2022-001, Forwards LER 2022-001-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Automatic Reactor Trip Due to High Reactor Coolant System PressureCalvert Cliffs3 March 2022Reactor Coolant System
05000318/LER-2021-003, Forward LER 2021-003-00 for Calvert Cliffs Nuclear Power Plant, Unit No. 2, Auxiliary Feedwater Pump Inoperable Due to Improper Reset of Trip Throttle Valve. Cover Letter OnlyCalvert Cliffs23 September 2021Auxiliary Feedwater
05000327/LER-2021-001, & LER 2021-001-00 for Sequoyah Nuclear Plant, Units 1 & 2, Ice Bed Inoperable Due to Exceeding Surveillance Requirement FrequencySequoyah22 September 2021Safe Shutdown
05000327/LER-2021-002, Letter Forwarding LER 2021-002-00 & LER 2021-001-00 for Sequoyah Nuclear Plant, Units 1 & 2Sequoyah22 September 2021
05000456/LER-2021-001, Forward LER 2021-001-00 for Braidwood Station, Unit 1, Train a and B Source Range Neutron Flux Trip Functions Bypassed During Plant StartupBraidwood21 June 2021
05000483/LER-2020-005, Forward LER 2020-005-00 for Callaway Plant, Unit 1, Inoperable Isolation Valve Between Safety-Related Essential Service Water and Nonsafety-Related Service WaterCallaway17 November 2020Service water
05000281/LER-2020-001, Cancellation of LER 2020-001-00 for Surry Power Station Unit 2 Re Loss of Containment Cooling Affecting Containment Partial Pressure IndicationSurry6 November 2020Reactor Coolant System
05000483/LER-2020-002, Submittal of LER 2020-002-00 for Callaway, Unit 1, Reactor Trip and AFW Actuation Following Spurious MFRV ClosureCallaway3 June 2020Feedwater
Auxiliary Feedwater
05000482/LER-2020-001, Transmittal of LER 2020-001-00 for Wolf Creek, Plant Shutdown Due to Inoperable Containment Purge Isolation ValvesWolf Creek1 April 2020
05000461/LER-2020-001, Submittal of LER 2020-001-00 for Clinton Power Station, Unit 1, Reportable Contraband EventClinton23 March 2020Contraband
05000366/LER-2020-001Hatch2 March 2020Primary containmentLarge early release frequency
05000423/LER-2019-001Millstone13 February 2020Steam Generator
Emergency Diesel Generator
Auxiliary Feedwater
Decay Heat Removal
05000280/LER-2019-002Surry4 February 2020Service water
Auxiliary Feedwater
Main Steam
Safe Shutdown
Unanalyzed Condition
Tornado Missile
Enforcement Discretion
Tornado Generated Missile
Tornado Missile Protection
05000289/LER-2017-004Three Mile Island
Three Mile Island Unit 1
5 February 201810 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition
10 CFR 50.73(a)(2)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
10 CFR 50.73(a)(2)(vii), Common Cause Inoperability
10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
Emergency Diesel GeneratorSafe Shutdown
Unanalyzed Condition
Enforcement Discretion
Tornado Generated Missile
Tornado Missile Protection
05000461/LER-2017-010Clinton9 December 2017
5 February 2018
10 CFR 50.73(a)(2)(iv)(A), System Actuation
10 CFR 50.73(a)(2)(v)(C), Loss of Safety Function - Release of Radioactive Material
Secondary containment
Reactor Protection System
Main Steam Isolation Valve
Reactor Water Cleanup
Standby Gas Treatment System
Emergency Core Cooling System
Control Rod
Unanalyzed Condition
05000388/LER-2017-010Susquehanna2 February 201810 CFR 50.73(a)(2)(i)(B), Prohibited by Technical SpecificationsCore Spray
Residual Heat Removal
Low Pressure Coolant Injection
05000293/LER-2017-013Pilgrim26 November 2017
25 January 2018
10 CFR 50.73(a)(2)(v)(C), Loss of Safety Function - Release of Radioactive Material
10 CFR 50.73(a)(2)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Secondary containment
Primary containment
Standby Gas Treatment System
Mission time
Recently irradiated fuel
05000391/LER-2017-005Watts Bar
Watts Bar Nuclear Plant. Unit 2
25 January 201810 CFR 50.73(a)(2)(iv)(A), System ActuationReactor Coolant System
Emergency Diesel Generator
Emergency Core Cooling System
Safe Shutdown
05000390/LER-2017-013Watts Bar6 September 2017
24 January 2018
10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical SpecificationsSecondary containment
Auxiliary Building Gas Treatment System
Shield Building
Safe Shutdown
Safe Shutdown Earthquake
Past operability
Probabilistic Risk Assessment
05000498/LER-2017-002South Texas22 January 201810 CFR 50.73(a)(2)(i)(B), Prohibited by Technical SpecificationsHVAC
Control Room Emergency Ventilation
Large early release frequency
05000446/LER-2017-003Comanche Peak
Comanche Peak Nuclear Power Plant, Unit 2
25 November 2017
22 January 2018
10 CFR 50.73(a)(2)(iv)(A), System Actuation
10 CFR 50.73(a)(2)(v), Loss of Safety Function
Steam Generator
Feedwater
Reactor Protection System
Auxiliary Feedwater
Main Turbine
05000263/LER-2017-006Monticello14 November 2017
12 January 2018
10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor
10 CFR 50.73(a)(2)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
10 CFR 50.73(a)(2)(v), Loss of Safety Function
Reactor Coolant System
Reactor Protection System
Main Steam Isolation Valve
Main Steam Line
Main Steam
Safe Shutdown
Half scram
Fuel cladding
05000306/LER-2017-003Prairie Island11 January 201810 CFR 50.73(a)(2)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
Service water
Main Steam Isolation Valve
Main Steam Line
Containment Spray
05000364/LER-2017-005Farley
Joseph M Farley Nuclear Plant, Unit 2
3 January 2017
11 January 2018
10 CFR 50.73(a)(2)(v), Loss of Safety Function
10 CFR 50.73(a)(2)(i)
10 CFR 50.73(a)(2)()
05000272/LER-2017-001Salem9 November 2017
8 January 2018
10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical SpecificationsSteam Generator
Reactor Coolant System
Safe Shutdown
05000390/LER-2017-015Watts Bar9 November 2017
8 January 2018
10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical SpecificationsSafe Shutdown
05000254/LER-2017-004Quad Cities7 November 2017
5 January 2018
Feedwater
High Pressure Coolant Injection
Core Spray
Low Pressure Coolant Injection
05000461/LER-2017-009Clinton
Clinton Power Station, Unit 1 .
5 November 2017
4 January 2018
10 CFR 50.73(a)(2)(v)(C), Loss of Safety Function - Release of Radioactive MaterialSecondary containment
Service water
Standby Gas Treatment System
05000334/LER-2017-003Beaver Valley7 November 2017
4 January 2018
10 CFR 50.73(a)(2)(iv)(A), System ActuationSteam Generator
Feedwater
Reactor Protection System
Auxiliary Feedwater
Control Rod
05000219/LER-2017-005Oyster Creek9 October 2017
3 January 2018
10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical SpecificationsEmergency Diesel GeneratorSafe Shutdown
Mission time
05000296/LER-2017-002Browns Ferry29 December 201710 CFR 50.73(a)(2)(ii)(B), Unanalyzed ConditionEmergency Diesel GeneratorSafe Shutdown
Unanalyzed Condition
Time of Discovery
Large early release frequency
05000249/LER-2017-001Dresden27 December 201710 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor
10 CFR 50.73(a)(2)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
Reactor Pressure Vessel
Standby Liquid Control
Control Rod
Time of Discovery
Enforcement Discretion
Through Wall Leak
05000395/LER-2017-005Summer7 January 2017
22 December 2017
10 CFR 50.73(a)(2)(iv)(A), System ActuationSteam Generator
Feedwater
Decay Heat Removal
Main Condenser
Control Rod
Large early release frequency
05000364/LER-2017-004Farley
Joseph M. Farley Nuclear Plant. Unit 2
22 December 201710 CFR 50.73(a)(2)(i)(B), Prohibited by Technical SpecificationsSteam Generator
Reactor Coolant System
Main Steam Isolation Valve
Auxiliary Feedwater
Main Steam Line
05000390/LER-2017-016Watts Bar Nuclear Plant. Unit 120 December 201710 CFR 50.73(a)(2)(iv)(A), System Actuation
10 CFR 50.73(a)(2)(v)(C), Loss of Safety Function - Release of Radioactive Material
10 CFR 50.73(a)(2)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Emergency Diesel Generator
Auxiliary Feedwater
Safe Shutdown
Offsite Circuit
05000278/LER-2017-001Peach Bottom23 October 2017
20 December 2017
10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded
Reactor Coolant System
Residual Heat Removal
Time of Discovery
Pressure Boundary Leakage
05000286/LER-2017-004Indian Point3 November 2017
20 December 2017
10 CFR 50.73(a)(2)(iv)(A), System ActuationSteam Generator
Reactor Coolant System
Feedwater
Reactor Protection System
Emergency Diesel Generator
Auxiliary Feedwater
Permanent Magnet Generator
Main Condenser
Control Rod
Main Steam
Temporary Modification
05000364/LER-2017-003Farley20 December 201710 CFR 50.73(a)(2)(i)(B), Prohibited by Technical SpecificationsReactor Coolant SystemTime of Discovery
05000390/LER-2017-014Watts Bar30 October 2017
20 December 2017
10 CFR 50.73(a)(2)(v)(D), Loss of Safety Function - Mitigate the Consequences of an AccidentControl Room Emergency VentilationSafe Shutdown
Probabilistic Risk Assessment
05000364/LER-2017-002Farley19 December 201710 CFR 50.73(a)(2)(v), Loss of Safety Function
10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
Steam Generator
Reactor Coolant System
Main Steam Safety Valve
Main Condenser
Main Steam
05000395/LER-2017-006Summer
Vc Summer - Unit 1
31 October 2017
15 December 2017
10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical SpecificationsGrab sample
05000261/LER-2017-002Robinson24 October 2017
14 December 2017
Time of Discovery
Contraband
Scaffolding
05000266/LER-2017-003Point Beach30 October 2017
13 December 2017
10 CFR 50.73(a)(2)(ii)(A), Seriously DegradedReactor Coolant SystemSafe Shutdown
Boric Acid
... further results