Part 21 Reports

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The U.S. Nuclear Regulatory Commission (NRC) receives reports from its licensees under Part 21 of Title 10 of the Code of Federal Regulations. This regulation specifies the conditions under which information must be submitted when a licensed facility, activity, or basic component fails to comply with the Atomic Energy Act of 1954, as amended, or other NRC regulations.

As of November 27, 2018, a web page listing 50.73 Licensee Event Reports that may report Defects and Noncompliance (in lieu of Part 21) is being provided for information purposes only. It is important to note that the information contained in these Licensee Event Reports is provided by the licensee, and has not been verified by the NRC to actually constitute a defect as described in 10 CFR Part 21. The NRC initially introduced the practice of linking Licensee Event Reports that may report Defects and Noncompliance to the Part 21 Reports page of the NRC public website in Information Notice 2011-19 "Licensee Event Reports Containing Information Pertaining to Defects to Basic Components."

Recently Updated Reports

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Log No. Notifier Description Report Date Event No. / Accession No.
2024-15-03 Paragon Energy Solutions Interim Report of a Deviation Associated with a Potential Defect with Schneider Electric Medium Voltage VR Type Circuit Breaker Part Number V5D4133Y000 06/29/2024 ML24183A235
2024-18-01  Sequoyah Nuclear Plant  Retraction of Interim Report of a Deviation or Failure to Comply – Transducer Model 8005N 06/24/2024 ML24176A022
2024-24-00 Tennessee Valley Authority Interim Report of a Deviation Associated with a Valve in the Unit 3 High Pressure Coolant Injection System 06/23/2024 ML24175A004
2024-23-00 Framatome Interim Report of a Deviation Associated with Burnable Poison Rod Assemblies 06/22/2024 ML24177A169
2024-20-01 Paragon Energy Solutions Final Report of a Deviation Associated with an Emergency Diesel Generator Voltage Regulator 06/21/2024 ML24176A101
2024-22-00 Flowserve Corp Interim Report of a Deviation Associated with a ½" 1878 Piston Check Valve with adjustable cracking pressure SN: 96CEE  06/11/2024  ML24170A863
2024-15-02 Paragon Energy Solutions Interim Report of a Deviation Associated with a Potential Defect with Schneider Electric Medium Voltage VR Type Circuit Breaker Part Number V5D4133Y000 05/31/2024 ML24155A091
2024-21-00 Diablo Canyon Power Plant, Units 1 and 2  Interim Report of a Deviation Associated with Emergency Diesel Generator Fuel Snubber Valve Assembly  05/28/2024  ML24149A357
2024-20-00 Paragon Energy Solutions Interim Report of a Deviation Associated with an Emergency Diesel Generator Voltage Regulator 05/24/2024  ML24149A160 
2024-06-01 Ametek Solidstate Controls  Final Report of a Deviation Associated with an Oil Filled Capacitors in Aluminum Case Part Number 07-020139-10 05/17/2024   ML24141A048
2024-19-00 TE Connectivity Interim Report of a Deviation Associated with Non-compliant Material Used in the Potting of the Coils for E7000 Series Relays 04/23/2024  ML24128A237
2024-15-01 Paragon Energy Solutions  Interim Report of a Deviation Associated with a Potential Defect with Schneider Electric Medium Voltage VR Type Circuit Breaker Part Number V5D4133Y000  05/02/2024  ML24127A089
2024-17-00 Global Nuclear Fuel Part 21 Final Report Notification: GNF3 Spacer Relocation 04/22/2024   ML24113A202
2024-18-00 Sequoyah Nuclear Plant Interim Report of a Deviation or Failure to Comply – Transducer Model 8005N 04/25/2024 ML24116A261
2024-15-00 Paragon Energy Solutions Interim Report of a Deviation Associated with a Potential Defect with Schneider Electric Medium Voltage VR Type Circuit Breaker Part Number V5D4133Y000  04/16/2024 ML24108A079
2024-06-01  Ametek Solidstate Controls  Final Report of a Deviation Associated with an Oil Filled Capacitors in Aluminum Case Part Number 07-020139-10 05/17/2024 ML24141A048
2024-16-00 Farley Nuclear Plant 10 CFR Part 21 Report for Siemens Low Voltage AKW Circuit Breaker 04/15/2024 ML24106A162
2024-14-00 Engine Systems Inc Interim Report of a Deviation Associated with a Leaking Cylinder Liner in Emergency Diesel Generator 04/12/2024 ML24107A697
2024-13-00 Transco Products Inc Interim Report of a Deviation Associated with Unverified Critical Characteristics of Darmatt KM-1 Flat Board 04/09/2024 ML24103A202
2024-07-01 Xcel Energy / Prairie Island Nuclear Generating Plant Interim Report of a Potential Deviation or Failure to Comply Associated with Bentley Systems Incorporated AutoPIPE Software (Update) 04/09/2024 ML24101A063
2024-12-00 Diablo Canyon Power Plant 10 CFR Part 21 Interim Report Regarding Mechanical Snubbers 04/03/2024 ML24095A157
2024-10-01 Cooper Nuclear Station 10 CFR Part 21 Report Regarding Service Water Booster Pump Bearing Housing Covers 03/27/2024 ML24087A214
2024-11-00 Alpha-Omega Services, Inc Interim Report of a Deviation Associated with Failure to Comply with Testing Requirements 03/18/2024 ML24086A017
2024-10-00 Cooper Nuclear Station  Interim Report of a Deviation Associated with a Residual Heat Removal Service Water Booster Pump Bearing Housing Cover Oil Leak  03/01/2024  EN 57001
2024-09-00 Fairbanks Morse Interim Report of a Deviation Associated with Synchro-Start Mini-Gen Signal Generator, Woodward Part Number (PN) SA-3176-D; Fairbanks Morse PN 16302997 02/25/2024 ML24057A338 
2024-08-00 Fairbanks Morse Interim Report of a Deviation Associated with Air Start Valve ASCO Part Number (PN) X300529797001HN, Fairbanks Morse PN 11916969 02/25/2024 ML24057A337
2024-02-01 Tennessee Valley Authority  Final Report of a Deviation Associated with a Crompton Instruments Type 077 Ammeter   02/22/2024 ML24053A393
2023-31-01 Tennessee Valley Authority  Final Report of a Deviation Associated with a Lube Oil Scavenging and Fuel Oil Engine Driven Pump  02/14/2024 ML24046A025
2024-07-00 Xcel Energy / Prairie Island Nuclear Generating Plant  Interim Report of a Deviation Associated with Bentley Systems Incorporated AutoPIPE Software 02/09/2024 ML24040A171
2024-06-00 Ametek Solidstate Controls Interim Report of a Deviation Associated with an Oil Filled Capacitors in Aluminum Case Part Number 07-020139-10  02/09/2024 ML24043A086
2024-04-01 VC Summer Nuclear Station Interim Report of a Deviation Associated with a Manufacturing Defect Affecting a Control Power Circuit Monitor (CP1) Relay on its 'B' Emergency Diesel Generator 02/07/2024 ML24038A031
2024-03-01 VC Summer Nuclear Station Interim Report of a Deviation Associated with a Manufacturing Defect Affecting a Field Flash Contactor (K2) relay on its 'B' Emergency Diesel Generator 02/07/2024 ML24038A032
2023-26-02 Tioga Pipe, Inc Final Report of a Deviation Associated with Buttweld 90 Degree Elbows 02/02/2024 ML24037A020
2023-27-01 TVA (Tennessee Valley Authority) Final Report of a Deviation Associated with Starter Contactors for the BFN Unit 1 High Pressure Coolant Injection Suppression Pool Inboard Suction Valve  02/01/2024 ML24032A476
2023-24-01 Tennessee Valley Authority Final Report of a Deviation or Failure to Comply Associated with a Relay in the Unit 2 Reactor Core Isolation Cooling Condensate Pump  01/23/2024 ML24023A280
2024-05-00 VC Summer Nuclear Station Interim Report of a Deviation Associated with Emergency Diesel Generator Fuel Oil Piping  01/18/2024 ML24018A011
2024-01-01 Engine Systems, INC. Interim Report of a Deviation Associated with an Electro-Motive Diesel (EMD) Cylinder Liner with Bore Deficiency, P/N 9318833 (component of power assembly P/N 40124897)  01/17/2024 ML24018A014
2023-28-01 Paragon Energy Solutions Final Report of a Deviation Associated with Detroit Diesel/MTU Fuel Injectors PN R5229660 Cat ID# 0001390618  01/17/2024 ML24018A036
2023-20-02 Browns Ferry Nuclear Plant Final Report of a Deviation Associated with a Deviation or Failure to Comply Associated with Check Valve 0-CKV-023-0565 for D1 Residual Heat Removal Service Water Pump   01/16/2024 ML24016A304
2024-04-00 VC Summer Nuclear Station Interim Report of a Deviation Associated with a Manufacturing Defect Affecting a Control Power Circuit Monitor (CP1) Relay on its 'B' Emergency Diesel Generator  01/10/2024 EN 56919
2024-03-00 VC Summer Nuclear Station Interim Report of a Deviation Associated with a Manufacturing Defect Affecting a Field Flash Contactor (K2) relay on its 'B' Emergency Diesel Generator  01/10/2024 EN 56920
2024-01-00 Engine Systems, INC. Interim Report of a Deviation Associated with an Electro-Motive Diesel (EMD) Cylinder Liner with Bore Deficiency, P/N 9318833 (component of power assembly P/N 40124897), S/N 20M0938.  01/04/2024 ML24008A069
2024-02-00 Tennessee Valley Authority  Interim Report of a Deviation Associated with an Crompton Instruments Type 077 Ammeter 01/03/2024 ML24004A033
2023-31-00 Tennessee Valley Authority Interim Report of a Deviation Associated with an Lube Oil Scavenging and Fuel Oil Engine Driven Pump  12/28/2023 ML24002A711
2023-30-00 Valcor Engineering Corporation Interim Report of a Defect Associated with Valcor Solenoid Valves V52600-5890-1 12/22/2023 ML23363A146
2023-29-00 VC Summer Interim Report of a Deviation Associated with the Design of an Emergency Diesel Generator Fuel Oil Piping System 12/21/2023 EN 56905
2023-28-00 Paragon Energy Solutions Interim Report of a Deviation Associated with Detroit Diesel/MTU Fuel Injectors PN R5229660 Cat ID# 0001390618  12/19/2023 ML23354A094
2022-15-01 SNC (Southern Nuclear Operating Company) Final Report of a Deviation Associated with Framatome Supplied Siemens Medium Voltage Circuit Breakers  12/15/2023 ML23349A115
2023-27-00 TVA (Tennessee Valley Authority)  Interim Report of a Deviation Associated with Starter Contactors for the BFN Unit 1 High Pressure Coolant Injection Suppression Pool Inboard Suction Valve  12/14/2023 ML23348A394
2023-25-01 Sequoyah Final Report of a Deviation Associated with Siemens 6.9kV, 1200A Vacuum Circuit Breaker Defects  01/10/2024 ML24010A213
2023-25-00 Sequoyah Interim Report of a Deviation Associated Siemens 6.9kV, 1200A Vacuum Circuit Breaker Defects  12/13/2023 EN 56888
2023-26-01 Flowline Inc. Interim Report of a Deviation Associated with Buttweld 90 Degree Elbows 12/12/2023 ML24004A209
2023-26-00 Tioga Interim Report of a Deviation Associated with Buttweld 90 Degree Elbows  12/08/2023 ML23352A238
2023-23-01 Enertech Final Report of a Deviation Associated with P/N D2060S Potentiometer  12/07/2023 ML23352A246
2023-24-00 Tennessee Valley Authority Interim Report of a Deviation or Failure to Comply Associated with a Relay in the Unit 2 Reactor Core Isolation Cooling Condensate Pump 12/01/2023 ML23335A072
2023-19-01 Flowserve Limitorque Actuators  Final Report of a Deviation Associated with a SMB-1 Geared Limit Switch Assembly 11/17/2023 ML23324A377
2023-20-01 Browns Ferry Nuclear Plant  Interim Report of a Deviation Associated with a Deviation or Failure to Comply Associated with Check Valve 0-CKV-023-0565 for D1 Residual Heat Removal Service Water Pump 11/16/2023 ML23320A254
2023-22-02 MISTRAS Group, Inc Final Report Notification Pursuant to 10 CFR Part 21.21, Regarding a Deviation in the Calibration Certificates for An Acoustic Emission Instrument 11/10/2023 ML23317A291
2023-21-01 DC Cook Nuclear Plant Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding an issue with an Emergency Diesel Generator (EDG) Digital Reference Unit (DRU) supplied by Engine Systems Incorporated 11/08/2023 ML23312A231
2023-23-00 Enertech Interim Report of a Deviation Associated with P/N D2060S Potentiometer 10/27/2023 ML23306A072
2023-22-01 MISTRAS Group, Inc Deviation in the Calibration Certificates for An Acoustic Emission Instrument 10/31/2023 EN 56808
2022-20-01 Grand Gulf Primary Containment Outer Airlock Door Inoperable Due to Unacceptable Leak Rate 11/30/2022 ML22334A222
2023-22-00 MISTRAS Group, Inc Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding a Deviation in the Calibration Certificates for an Acoustic Emission Instrument 10/20/2023 ML23296A086
2023-21-00 DC Cook Nuclear Plant Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding an issue with an Emergency Diesel Generator (EDG) Digital Reference Unit (DRU) supplied by Engine Systems Incorporated 10/12/2023 EN 56789
2023-20-00 Browns Ferry Nuclear Plant Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding a Deviation or Failure to Comply Associated with Check Valve 0-CKV-023-0565 for D1 Residual Heat Removal Service Water Pump 10/06/2023 ML23282A002
2023-19-00 Flowserve Limitorque Actuators Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding a Deviation Associated With a SMB-1 Geared Limit Switch Assembly 09/28/2023 ML23276A641
2023-18-01 Paragon Energy Solutions Final Report Notification Pursuant to 10 CFR Part 21.21, Regarding Potential Defect with Eaton JD and HJD Series Molded Case Circuit Breakers 10/05/2023 ML23279A061
2023-18-00 Paragon Energy Solutions Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Potential Defect with Eaton JD and HJD Series Molded Case Circuit Breakers 09/06/2023 ML23254A024
2023-16-01 Cooper Nuclear Station Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Certain GE-Hitachi HGA Relays 09/06/2023 ML23249A112
2023-14-01 GE Hitachi Nuclear Energy Part 21 Final Report Notification: Failure of the CRD Collet Retainer Tube/Outer Tube Weld 07/27/2023 ML23207A198
2023-14-00 GE Hitachi Nuclear Energy Updated - Part 21 60-Day Interim Report Notification: Failure of the CRD Collet Retainer Tube/Outer Tube Weld 08/31/2023 ML23243B004
2023-15-01 Paragon Energy Solutions Final Report Notification Pursuant to 10 CFR Part 21.21, Regarding Defect with Eaton/Cutler Hammer Size 4 and 5 Freedom Series Contactors 08/25/2023 ML23241A002
2023-13-01 River Bend Station Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Motor Driven Relay Failed Testing 08/24/2023 ML23236A246
2023-17-01 Curtis-Wright Nuclear Division

Final Report Notification Pursuant to 10 CFR Part 21.21, Regarding Tyco (Agastat) Relay Failures

10/05/2023 ML23293A051
2023-17-00 Curtis-Wright Nuclear Division Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Tyco (Agastat) Relay Failures 08/17/2023 ML23233A169
2023-16-00 Cooper Nuclear Station Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Certain GE-Hitachi HGA Relays 08/15/2023
 
EN 56679
2023-15-00 Paragon Energy Solutions Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Defect with Eaton/Cutler Hammer Size 4 and 5 Freedom Series Contactors 08/03/2023 ML23221A370
2023-12-01 Summer 10 CFR Part 21 Report Emergency Feedwater Check Valve Socket Head Capscrew 07/31/2023 ML23212A954
2023-13-00 River Bend Station Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Motor Driven Relay Failed Testing 07/26/2023 EN 56641
2023-10-01 Paragon Energy Solutions Retraction of Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Potential Defect with Trane External Auto/Stop and Emergency Stop Relay Card PN: X13650728-06 07/14/2023 ML23207A076
2023-12-00 Summer Initial Report Notification Pursuant to 10 CFR Part 21.21, Regarding Cap Screw Improper Length 07/07/2023 EN 56612
2023-11-00 Engine Systems, INC Initial Report Notification Pursuant to 10 CFR Part 21.21, Regarding Voltage Regulator Chassis – Bus Bar Installation 06/30/2023 ML23192A062
2023-09-01 DTE Electric Company, Fermi 2 Final Report Notification Pursuant to 10 CFR Part 21.21, Regarding Mechanical Draft Cooling Tower Fan Brakes Design Flaw 06/23/2023 ML23177A043
2023-10-00 Paragon Energy Solutions Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Potential Defect with Trane External Auto/Stop and Emergency Stop Relay Card PN: X13650728-06 06/05/2023 ML23159A005
2023-09-00 DTE Electric Company, Fermi 2 Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Mechanical Draft Cooling Tower Fan Brakes Design Flaw 05/26/2023 ML23159A004
2023-08-00 Engine Systems, INC Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Woodward EGB-35P Governor 05/24/2023 ML23146A001
2023-07-00 Flowserve Limitorque Actuators Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Limitorque Actuator Motor Pinion Installation 05/19/2023 ML23142A174
2023-01-02 Sequoyah Nuclear Plant Retraction of Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Deviation or Failure to Comply Associated with a Limitorque Actuator 05/04/2023 ML23124A018
2023-06-00 Tennessee Valley Authority Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Deviation or Failure to Comply Associated with a GE HFA Relay 05/01/2023 ML23121A325
2022-23-03 United Controls International Final Report Notification Pursuant To 10 CFR Part 21.21, Regarding Schneider Electric P/N ASP840-000 Modicon Primary/Secondary Power Supply Failures 04/14/2023 ML23108A083
2023-05-00 Framatome Inc. Initial Report Notification Pursuant to 10 CFR Part 21.21, Regarding DS-206DC/416/632/II-516 Breakers – Erroneous Change of State (Eaton Corporation Breakers) 04/07/2023 ML23100A107
2023-03-01 Paragon Energy Solutions Final Report Notification Pursuant to 10 CFR Part 21.21 Defect identified in Automatic Transfer Switch PN: NLI-ATS480A400X1 03/31/2023 ML23094A137
2022-28-02 Velan Inc Final Report Notification Pursuant To 10 CFR Part 21.21, Regarding 14NPS Class 150 Triple Offset Butterfly Valve - Model W19-0CP13-KCDN-B0001 03/07/2023 ML23066A221
2023-04-00 Trillium Flow Technologies Initial Report Notification Pursuant to 10 CFR Part 21.21 Regarding Inconsistent Crimping of Motor Leads to Ring Terminal Connectors - Evaluation I211003 03/06/2023 ML23082A112
2023-03-00 Paragon Energy Solutions Initial Report Notification Pursuant to 10 CFR Part 21.21 Defect identified in Automatic Transfer Switch PN: NLI-ATS480A400X1 03/06/2023 ML23065A196
2022-26-02 Flowserve-Limitorque Final Notification of Potential Part 21 on Peerless 56 frame DC Motors 03/03/2023 ML23065A200
2022-23-02 United Controls International Interim Report Notification Pursuant To 10 CFR Part 21.21, Regarding Schneider Electric P/N ASP840-000 Modicon Primary/Secondary Power Supply Failures 03/03/2023 ML23065A193
2023-01-01 Sequoyah Nuclear Plant Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Deviation or Failure to Comply Associated with a Limitorque Actuator 03/01/2023 ML23060A041
2022-25-01 QualTech NP, Curtiss-Wright Nuclear Division Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Eaton TRM5 Timing Relays 02/06/2023 ML23038A019
2022-26-01 Flowserve-Limitorque Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Peerless 56 Frame DC Motors 01/27/2023 ML23030A664
2023-02-00 Sequoyah Nuclear Plant Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Siemens Medium Voltage Circuit Breakers 01/25/2023 ML23025A253
2023-01-00 Sequoyah Nuclear Plant Interim Report Notification Pursuant to 10 CFR Part 21.21, Regarding Deviation or Failure to Comply Associated with a Limitorque Actuator 01/24/2023 ML23024A029

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