ENS 57143
ENS Event | |
|---|---|
04:00 May 9, 2024 | |
| Title | Part 21 - Defect with Emergency Diesel Generator Voltage Regulator |
| Event Description | The following information was provided by Paragon Energy Solutions, LLC via email:
Paragon has identified a defect in one voltage regulator supplied to AEP DC Cook with serial number NLI-3S7950GR751A1-1007. Pursuant to 10CFR Part 21 � 21.21(d)(3)(i), Paragon is providing initial notification of a defect associated with the emergency diesel generator (EDG) voltage regulator. The voltage regulator was refurbished under the client purchase order 01600229, project number 351030025. Part of the refurbishment involved complete replacement of the units wiring, physical inspection and testing of the unit to Paragon approved acceptance testing instructions. The refurbished unit was supplied to the customer in December 2023. Prior to installation (March 2024), the unit successfully passed bench testing at the plant. During post installation testing, the EDG was started, and the output voltage pegged high and was not controllable. DC Cook subsequently removed the voltage regulator and documented the non-conformance. DC Cook troubleshooting determined the unit was mis-wired. The unit [voltage regulator] was returned to Paragon, and inspection confirmed the plant's diagnosis. The identified mis-wire affects the system circuitry by placing silicon controlled rectifier 5CD in a reverse biased position. The reversed biased rectifier blocks the flow of current which creates an open circuit condition. This open circuit condition causes the output voltage to max out, and does not allow the output voltage to be adjusted. This condition, if left uncorrected, could contribute to a substantial safety hazard and is reportable in accordance with 10CFR Part 21. Date of Discovery: May 9, 2024 Reportability Determined: May 23, 2024 Paragon has entered this condition in our corrective action program, and we have custody of the effected unit. The extent of condition is limited to this unit supplied to DC Cook. Paragon has determined there is no action necessary for DC Cook at this time. Affected plant: DC Cook
Paragon Energy Solutions submitted a final report for this event documenting the cause of the mis-wire and corrective actions to prevent recurrence. Paragon contact: Richard Knott, Vice President Quality Assurance, Paragon Energy Solutions, LLC, 7410 Pebble Drive, Ft. Worth, TX 76118, 817-284-0077, rknott@paragones.com. Notified R3DO (Havertape), R4DO (Josey), and Part 21 (email). |
| Where | |
|---|---|
| Paragon Energy Solutions Bridgman, Michigan (NRC Region 3) | |
| Organization: | Paragon Energy Solutions |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+371.78 h15.491 days <br />2.213 weeks <br />0.509 months <br />) | |
| Opened: | Richard Knott 15:47 May 24, 2024 |
| NRC Officer: | Natalie Starfish |
| Last Updated: | Jun 21, 2024 |
| 57143 - NRC Website | |
Paragon Energy Solutions with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 571432024-05-09T04:00:0009 May 2024 04:00:00
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