ENS Event | |
|---|---|
06:00 Dec 23, 2023 | |
| Title | Part 21 - MINI-GEN Signal Generator Defect |
| Event Description | The following is a summary of the information provided by Fairbanks Morse Engine via email:
Arkansas Nuclear One (ANO) Unit 2 had a failure of a mini-gen signal generator on the opposed piston emergency diesel generator. Bench testing after removal from the engine showed an erratic signal, and this was confirmed by Fairbanks Morse. Fairbanks Morse destructive analysis revealed wear of the dynamic surface on the stator bushing inside diameter. The cause of the worn stator bushing is most likely due to inadequate lubrication on the dynamic surfaces, outside diameter of the shaft and inside diameter of the stator bushing. Possible causes of inadequate lubrication could be failure to apply enough lubrication to the dynamic surfaces during the manufacturing process or deterioration/evaporation over time. Fairbanks Morse has implemented corrective actions to address this issue, and they are estimated to be completed by May 23, 2024. Affected plants with potentially defected parts: Arkansas Nuclear One, Edwin I. Hatch Nuclear Plant, Joseph M. Farley Nuclear Generating Station, Limerick Generating Station, and Prairie Island Nuclear Generating Plant. Point of Contact: Martin Kurr Quality Assurance Manager Fairbanks Morse 608-364-8247 Martin.Kurr@fmdefense.com Fairbanks Morse Notification Report Number: 23-02 |
| Where | |
|---|---|
| Fairbanks Morse Engine Beloit, Wisconsin (NRC Region 3) | |
| Organization: | Fairbanks Morse Engine |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+1551 h64.625 days <br />9.232 weeks <br />2.125 months <br />) | |
| Opened: | Martin Kurr 21:00 Feb 25, 2024 |
| NRC Officer: | Kerby Scales |
| Last Updated: | Feb 25, 2024 |
| 56993 - NRC Website | |
Fairbanks Morse Engine with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 569932023-12-23T06:00:00023 December 2023 06:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - MINI-GEN Signal Generator Defect ENS 569922023-12-22T06:00:00022 December 2023 06:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Air Start Valve (Bent Bottom Stem) ENS 562002022-10-27T05:00:00027 October 2022 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Fairbanks Morse Engine Emerency Diesel Generator Electronic Speed Control Module 2023-12-23T06:00:00 | |