ENS 56919
ENS Event | |
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05:00 Nov 12, 2021 | |
Title | Part 21 - EATON-CUTLER Hammer Relay on Emergency Diesel Failed |
Event Description | The following information was provided by the licensee via email and phone call:
On January 9, 2024, VC Summer Nuclear Station (VCSNS) determined a manufacturing defect affecting a control power circuit monitor (CP1) relay on its 'B' emergency diesel generator (EDG) was reportable under Part 21. On November 12, 2021, the 'B' EDG was rendered inoperable when its CP1 relay de-energized due to mechanical binding of the magnet carrier assembly. The binding was caused by a manufacturing defect that allowed heat-induced shrinkage to reduce the clearance between the magnet carrier and adjacent coil housing and base, preventing it from moving freely. VCSNS replaced the affected relay and restored operability of its 'B' EDG. Manufacturer/Model: Eaton-Cutler Hammer D26MRD30A1 A written notification in accordance with 10 CFR 21.21(d)(3)(ii) will be provided within 30 days. The NRC Senior Resident Inspector has been notified. The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance: The plant has notified the manufacturer. It is not known if any other plants are affected by this defect. |
Where | |
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V. C. Summer Jenkinsville, South Carolina (NRC Region 2) | |
Organization: | V. C. Summer |
Reporting | |
10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
Time - Person (Reporting Time:+18939.3 h789.138 days <br />112.734 weeks <br />25.943 months <br />) | |
Opened: | Justin Bouknight 08:18 Jan 10, 2024 |
NRC Officer: | Thomas Herrity |
Last Updated: | Jan 17, 2024 |
56919 - NRC Website
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WEEKMONTHYEARENS 566122023-05-11T16:50:00011 May 2023 16:50:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - CAP Screw Improper Length ENS 569192021-11-12T05:00:00012 November 2021 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - EATON-CUTLER Hammer Relay on Emergency Diesel Failed ENS 558082021-06-22T05:00:00022 June 2021 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Poppet Seal Failure ENS 569202021-05-05T05:00:0005 May 2021 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Gould Field Flash Relay on Emergency Diesel Failed 2023-05-11T16:50:00 | |