Event Notification Report for December 23, 2023
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
12/22/2023 - 12/23/2023
EVENT NUMBERS
56993
56993
Part 21
Event Number: 56993
Rep Org: Fairbanks Morse Engine
Licensee:
Region: 3
City: Beloit State: WI
County:
License #:
Agreement: Y
Docket:
NRC Notified By: Martin Kurr
HQ OPS Officer: Kerby Scales
Licensee:
Region: 3
City: Beloit State: WI
County:
License #:
Agreement: Y
Docket:
NRC Notified By: Martin Kurr
HQ OPS Officer: Kerby Scales
Notification Date: 02/25/2024
Notification Time: 21:00 [ET]
Event Date: 12/23/2023
Event Time: 00:00 [CST]
Last Update Date: 02/25/2024
Notification Time: 21:00 [ET]
Event Date: 12/23/2023
Event Time: 00:00 [CST]
Last Update Date: 02/25/2024
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):
Szwarc, Dariusz (R3DO)
Deboer, Joseph (R1DO)
Miller, Mark (R2DO)
Part 21/50.55 Reactors, - (EMAIL)
Szwarc, Dariusz (R3DO)
Deboer, Joseph (R1DO)
Miller, Mark (R2DO)
Part 21/50.55 Reactors, - (EMAIL)
PART 21 - MINI-GEN SIGNAL GENERATOR DEFECT
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
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