ENS 58135
ENS Event | |
|---|---|
05:00 Jan 26, 2026 | |
| Title | Part 21 - Defect with Electric Actuators |
| Event Description | 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
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). |
| Where | |
|---|---|
| Paragon Energy Solutions Spring City, Tennessee (NRC Region 2) | |
| Organization: | Paragon Energy Solutions |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+60.02 h2.501 days <br />0.357 weeks <br />0.0822 months <br />) | |
| Opened: | Richard Knott 17:01 Jan 28, 2026 |
| NRC Officer: | Josue Ramirez |
| Last Updated: | Feb 25, 2026 |
| 58135 - NRC Website | |
Paragon Energy Solutions with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 581352026-01-26T05:00:00026 January 2026 05:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Defect with Electric Actuators ENS 579812025-10-09T05:00:0009 October 2025 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect ≪Br≫≪Br≫ ENS 571432024-05-09T04:00:0009 May 2024 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Defect with Emergency Diesel Generator Voltage Regulator ENS 568992023-12-18T06:00:00018 December 2023 06:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Initial Part 21 Report - Deficient Fuel Injectors ENS 566532023-08-03T00:00:0003 August 2023 00:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect, 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Initial Part 21 Report - Defect with Eaton/Cutler Hammer Size 4 and 5 Freedom Series Contactors ENS 563872023-01-29T06:00:00029 January 2023 06:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Defect Identified in Automatic Transfer Switch ENS 554972021-09-03T05:00:0003 September 2021 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Deviation in DC-DC Converter Rectifiers in Inverter Assemblies ENS 553002021-06-08T05:00:0008 June 2021 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Initial Report - Deviation Identified in Bolting Utilized to Maintain Seismic Qualification: ENS 552232021-03-29T05:00:00029 March 2021 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Failure of Size 1 and 2 Freedom Series Full Voltage Reversing Starters ENS 547342020-06-01T05:00:0001 June 2020 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Failure of Size 1 and 2 Freedom Series Auxiliary Contacts ENS 547602020-06-01T05:00:0001 June 2020 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect 2026-01-26T05:00:00 | |