Event Notification Report for February 26, 2026
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Event Text
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
02/25/2026 - 02/26/2026
EVENT NUMBERS
58135
58135
Part 21
Event Number: 58135
Rep Org: Paragon Energy Solutions
Licensee:
Region: 2
City: Spring City State: TN
County:
License #:
Agreement: Y
Docket:
NRC Notified By: Richard Knott
HQ OPS Officer: Josue Ramirez
Licensee:
Region: 2
City: Spring City State: TN
County:
License #:
Agreement: Y
Docket:
NRC Notified By: Richard Knott
HQ OPS Officer: Josue Ramirez
Notification Date: 01/28/2026
Notification Time: 17:01 [ET]
Event Date: 01/26/2026
Event Time: 00:00 [EST]
Last Update Date: 02/25/2026
Notification Time: 17:01 [ET]
Event Date: 01/26/2026
Event Time: 00:00 [EST]
Last Update Date: 02/25/2026
Emergency Class: Non Emergency
10 CFR Section:
21.21(d)(3)(i) - Defects And Noncompliance
10 CFR Section:
21.21(d)(3)(i) - Defects And Noncompliance
Person (Organization):
Michel, Eric (R2DO)
Part 21/50.55 Reactors, - (EMAIL)
Michel, Eric (R2DO)
Part 21/50.55 Reactors, - (EMAIL)
EN Revision Imported Date: 2/26/2026
EN Revision Text: PART 21 - DEFECT WITH ELECTRIC ACTUATORS
The following is a summary of information provided by Paragon Energy Solutions, LLC via email:
Tennessee Valley Authority (TVA) experienced binding in several actuators (Schneider Electric part number MA-418-0-0-4) used to operate dampers associated with emergency diesel generator room ventilation. Paragon identified that precipitate particles from the lubricating oil can collect in the space between the small motor rotor and the stator thus preventing rotation of the shaft connected to the damper actuating linkage. This condition, if left uncorrected, could contribute to a safety hazard.
Paragon is working with TVA to define the extent of the condition and recommends Watts Bar segregate any spare actuators from the lots and monitor in service MA-418 actuator motors from different lots supplied for similar issues.
Paragon contact: Richard Knott, Vice President Quality Assurance, Paragon Energy Solutions, LLC, 7410 Pebble Drive, Fort Worth, TX 76118, 817-284-0077, rknott@paragones.com.
Affected plant: Watts Bar
* * * UPDATE ON 02/25/26 AT 0826 EST FROM RICHARD KNOTT TO ERIC SIMPSON VIA EMAIL AND PHONE * * *
The following is a synopsis of the Part 21 final update that was received:
TVA experienced binding in several actuators used to operate dampers associated with emergency diesel generator room ventilation. Paragon entered this issue into its corrective action program. Paragon conducted a detailed failure analysis which confirmed lubricating oil precipitate particles collecting in the gear train preventing rotation of the damper actuating shaft linkage. Additional investigation supports a conclusion that the extent of condition can be limited to the actuators supplied in 2017. Paragon suspects that the manufacturer may have inadvertently used oil already showing degradation during the manufacturing run. However, Paragon could not confirm with the vendor any potential deficiencies with the manufacturing processes or oil storage that would have contributed to this failure. Paragon recommends TVA continue to operate each actuator per station preventive maintenance frequencies.
Notified R2DO (Endress) and Part 21/50.55 Reactors (email).
EN Revision Text: PART 21 - DEFECT WITH ELECTRIC ACTUATORS
The following is a summary of information provided by Paragon Energy Solutions, LLC via email:
Tennessee Valley Authority (TVA) experienced binding in several actuators (Schneider Electric part number MA-418-0-0-4) used to operate dampers associated with emergency diesel generator room ventilation. Paragon identified that precipitate particles from the lubricating oil can collect in the space between the small motor rotor and the stator thus preventing rotation of the shaft connected to the damper actuating linkage. This condition, if left uncorrected, could contribute to a safety hazard.
Paragon is working with TVA to define the extent of the condition and recommends Watts Bar segregate any spare actuators from the lots and monitor in service MA-418 actuator motors from different lots supplied for similar issues.
Paragon contact: Richard Knott, Vice President Quality Assurance, Paragon Energy Solutions, LLC, 7410 Pebble Drive, Fort Worth, TX 76118, 817-284-0077, rknott@paragones.com.
Affected plant: Watts Bar
* * * UPDATE ON 02/25/26 AT 0826 EST FROM RICHARD KNOTT TO ERIC SIMPSON VIA EMAIL AND PHONE * * *
The following is a synopsis of the Part 21 final update that was received:
TVA experienced binding in several actuators used to operate dampers associated with emergency diesel generator room ventilation. Paragon entered this issue into its corrective action program. Paragon conducted a detailed failure analysis which confirmed lubricating oil precipitate particles collecting in the gear train preventing rotation of the damper actuating shaft linkage. Additional investigation supports a conclusion that the extent of condition can be limited to the actuators supplied in 2017. Paragon suspects that the manufacturer may have inadvertently used oil already showing degradation during the manufacturing run. However, Paragon could not confirm with the vendor any potential deficiencies with the manufacturing processes or oil storage that would have contributed to this failure. Paragon recommends TVA continue to operate each actuator per station preventive maintenance frequencies.
Notified R2DO (Endress) and Part 21/50.55 Reactors (email).
Page Last Reviewed/Updated February 26, 2026, 05:04 am EST