The U.S. Nuclear Regulatory Commission is in the process of rescinding or revising guidance and policies posted on this webpage in accordance with Executive Order 14151 Ending Radical and Wasteful Government DEI Programs and Preferencing, and Executive Order 14168 Defending Women From Gender Ideology Extremism and Restoring Biological Truth to the Federal Government. In the interim, any previously issued diversity, equity, inclusion, or gender-related guidance on this webpage should be considered rescinded that is inconsistent with these Executive Orders.

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.
2025-06-01 Curtiss-Wright Nuclear Division Updated Interim Report of a Deviation Associated with GE Over/Under Voltage Time Delay Relay PN: 12|AV69A1A 04/09/2025 ML25100A099
2025-06-00 Curtiss-Wright Nuclear Division  Interim Report of a Deviation Associated with GE Over/Under Voltage Time Delay Relay PN: 12|AV69A1A  04/08/2025 ML25099A160
2024-26-07 RSCC Wire & Cable LLC Update to Retraction of Final Report of a Deviation Associated with a Non-compliant Insulated Conductor 03/28/2025 ML25097A281
2025-05-00 Southern Nuclear Operating Company  Interim Report of a Deviation Associated with an ETAP Software Error in Transient Stability Program  03/26/2025 ML25085A382
2024-25-02 Westinghouse Electric Co Updated Interim Report of a Deviation Associated with Westinghouse-supplied Generation 2 and 3 CR-99 and Trident X Control Rod Blades 03/24/2025 ML25083A010
2025-03-01 Duke Energy, Inc. Updated Interim Report of a Deviation Associated with Love Controllers Identified with Limpet Supplier Part Number 54-834-838-8187-8160-8134-8174 03/20/2025 ML25079A082
2024-33-03  Ametek Solidstate Controls, Inc Updated Final Report of a Deviation Associated with a Battery Charger Printed Circuit Board, Ametek Part #80-9214031-90, with a Locator of X302, Capacitor’s C35 and C36 03/13/2025 ML25073A045
2025-04-00 Curtiss-Wright Nuclear Division Interim Report of a Deviation Associated with Generation 3 QDCs Produced from Curtiss-Wright Middleburg Heights  03/12/2025 ML25072A045
2024-37-01  Ametek Solidstate Controls, Inc Interim Report of a Deviation Associated with Ametek Regulating Transformer Models 85-IS0075-12 and 85-IS0150-14 03/11/2025 ML25071A101
2025-02-01 Prairie Island Nuclear Generating Plant  Closure of Interim Report of a Deviation Associated with an Edward Model 15004T5 2-inch Globe Valve 02/28/2025 ML25059A074
2024-36-01 FitzPatrick Nuclear Power Plant  Closure of Interim Report of a Deviation Associated with General Electric Thermal Overload Relay, Model CR124G011, Part Number DD317A7861P003   02/28/2025 ML25059A254
2024-33-02 Ametek Solidstate Controls, Inc Final Report of a Deviation Associated with a Battery Charger Printed Circuit Board, Ametek Part #80-9214031-90, with a Locator of X302, Capacitor’s C35 and C36 02/27/2025 ML25062A274
2025-03-00 Duke Energy, Inc.  Interim Report of a Deviation Associated with Love Controllers Identified with Limpet Supplier Part Number 54-834-838-8187-8160-8134-8174  02/19/2025 ML25051A030
2025-01-01 Flowserve US, Inc  Final Report of a Deviation Associated with Limitorque SMB-00 Torque Switch Assemblies  02/14/2025 ML25050A042
2024-26-06  RSCC Wire & Cable LLC  Update to Retraction of Final Report of a Deviation Associated with a Non-compliant Insulated Conductor 02/13/2025 ML25045A198
2024-33-01 Duke Energy Carolinas, LLC Interim Report of a Deviation Associated with a Battery Charger Printed Circuit Board, Ametek Part #80-921-4031-9  01/31/2025 ML25034A112
2025-02-00  Prairie Island Nuclear Generating Plant  Interim Report of a Deviation Associated with an Edward Model 15004T5 2-inch Globe Valve  01/24/2025 ML25027A099
2025-01-00 Flowserve US, Inc  Interim Report of a Deviation Associated with Limitorque SMB-00 Torque Switch Assemblies 01/02/2025 ML25006A165
2024-37-00 Ametek Solidstate Controls, Inc Interim Report of a Deviation Associated with Ametek Regulating Transformer Models 85-IS0075-12 and 85-IS0150-14 12/28/2024 ML24365A117
2024-34-01 Nextra Energy Seabrook, LLC Final Report of a Deviation Associated with a GE Hitachi Relay CR120B (Model #DD945E118P0060)  12/02/2024 ML24337A132
2024-24-02 Tennessee Valley Authority Updated Report of a Deviation Associated with a Valve in the Unit 3 High Pressure Coolant Injection System  11/27/2024 ML24332A037
2024-36-00  FitzPatrick Nuclear Power Plant  Interim Report of a Deviation Associated with General Electric Thermal Overload Relay, Model CR124G011, Part Number DD317A7861P003  11/22/2024 ML24330A242
2024-35-00 Columbia Generating Station  Interim Report of a Deviation Associated with a Substitute Compound O-ring for Type V70900-45 Valves  11/21/2024 ML24326A362
2024-34-00 Nextra Energy Seabrook, LLC Interim Report of a Deviation Associated with a GE Hitachi Relay CR120B (Model #DD945E118P0060) 11/14/2024 ML24320A089
2024-32-01 North Anna Power Station   Interim Report of a Deviation Associated with a Molded Case Switch, Model: Eaton J250K  10/28/2024 ML24302A240
2024-33-00 Duke Energy Carolinas, LLC Interim Report of a Deviation Associated with a Battery Charger Printed Circuit Board, Ametek Part#80-921-4031-9  10/28/2024 ML24303A185
2024-26-05 RSCC Wire & Cable LLC Update to Retraction of Final Report of a Deviation Associated with a Non-compliant Insulated Conductor   10/28/2024 ML24302A277
2024-32-00 North Anna Power Station Interim Report of a Deviation Associated with a Molded Case Switch, Model: Eaton J250K 10/09/2024 EN 57370
2024-30-01 NextEra Energy Final Report of a Deviation Associated with a Westinghouse Relay, Model NBFD31S  10/08/2024 ML24282A785
2024-31-00 MPR Associates, Inc Interim Report of a Deviation Associated with Non-Compliant Contactors, Models AF80 and AF116 10/04/2024 ML24281A066
2024-07-02 Xcel Energy / Prairie Island Nuclear Generating Plant  Closure of Interim Report of a Deviation Associated with Bentley Systems Incorporated AutoPIPE Software 10/03/2024  ML24277A101
2024-26-04 RSCC Wire & Cable LLC  Update to Retraction of Final Report of a Deviation Associated with a Non-compliant Insulated Conductor 09/26/2024 ML24274A124
2024-30-00  NextEra Energy Interim Report of a Deviation Associated with a Westinghouse Relay, Model NBFD31S  09/18/2024 ML24262A223
2024-26-03 RSCC Wire & Cable LLC Update to Retraction of Final Report of a Deviation Associated with a Non-compliant Insulated Conductor 09/17/2024 ML24262A083
2024-29-00 Southern Nuclear Operating Co, Inc Interim Report of a Deviation Associated with a ETAP Software Error in Transient Stability Program 09/09/2024 ML24253A170
2024-28-01 Diablo Canyon Power Plant Interim Report of a Deviation Associated with ALCO Snubber Valve Assemblies Part Number 2402466 09/09/2024 ML24255A090
2024-26-02 RSCC Wire & Cable LLC Retraction of Final Report of a Deviation Associated with a Non-compliant Insulated Conductor 09/06/2024 ML24255A864
2024-25-01 Westinghouse Electric Co Interim Report of a Deviation Associated with Westinghouse-supplied Generation 3 CR-99 and Trident X Control Rod Blades  09/04/2024 ML24249A136
2024-27-01 Browns Ferry Nuclear Plant  Retraction of Interim Report of a Deviation Associated with a Fike Metal Products 16-inch Rupture Disc, Part Number 16-CPV-C 08/22/2024 EN 57245
2024-24-01 Tennessee Valley Authority Updated Report of a Deviation Associated with a Valve in the Unit 3 High Pressure Coolant Injection System 08/22/2024 ML24235A497
2024-26-01 RSCC Wire & Cable LLC  Final Report of a Deviation Associated with a Non-compliant Insulated Conductor 08/23/2024 ML24239A397 
2024-28-00 Diablo Canyon Power Plant Interim Report of a Deviation Associated with ALCO Snubber Valve Assemblies Part Number 2402466   08/15/2024 EN 57271
2024-15-04 Paragon Energy Solutions Retraction of Interim Report of a Deviation Associated with a Potential Defect with Schneider Electric Medium Voltage VR Type Circuit Breaker Part Number V5D4133Y000 07/27/2024 ML24211A087
2024-27-00   Browns Ferry Nuclear Plant  Interim Report of a Deviation Associated with a Fike Metal Products 16-inch Rupture Disc, Part Number 16-CPV-C 07/25/2024 EN 57245
2024-26-00 RSCC Wire & Cable LLC Interim Report of a Deviation Associated with a Non-compliant Insulated Conductor  07/25/2024 ML24208A096
2024-25-00 Westinghouse Electric Co  Interim Report of a Deviation Associated with Westinghouse-supplied Generation 3 CR-99 Control Rod Blades  07/21/2024  ML24203A001
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
2023-25-01 Sequoyah Final Report of a Deviation Associated with Siemens 6.9kV, 1200A Vacuum Circuit Breaker Defects  01/10/2024 ML24010A213

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Page Last Reviewed/Updated Wednesday, April 16, 2025