ENS Event | |
|---|---|
04:00 May 2, 2022 | |
| Title | Part 21 Report - Failure of an Eaton Electrical Cutler Hammer Relay |
| Event Description | The following information was provided by Framatome Inc. via email:
Framatome Inc. (Framatome) supplied an Eaton Electrical Cutler Hammer, Inc. (Eaton) D26MRD704A1 Relay to Duke Energy Carolinas, LLC, McGuire Nuclear Station, that failed to change state during testing of their load sequencer. This relay was supplied as a safety related component by Framatome. A molded contact bar in the D26 top adder deck prevented a contact spring from settling into its proper position. Top adder decks manufactured between 2003 and 2022 were inspected for the existence of flashing, but no specific time frame where the excess flashing was found could be identified. Testing of additional relays with this similar excess flashing condition, by both Framatome and Eaton, showed that contact springs tended to stay in place and were unaffected by the excess flashing. There have been no past similar relay reports by Framatome customers despite there being at least 587 other relays with top adder decks supplied as commercially dedicated components. Eaton has also indicated that they have had no other reports of this condition or failures associated with it. The extent of condition determined that the failure is an isolated incident. Only one relay, supplied to McGuire Nuclear Station, failed to change state. In the future, as a precaution, the Framatome commercial grade dedication process will include the inspection of the adder deck contact bars. Relays containing contact bars with excess flashing will be rejected. |
| Where | |
|---|---|
| Framatome Anp Lynchburg, Virginia (NRC Region 2) | |
| Organization: | Framatome Anp |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+1738.47 h72.436 days <br />10.348 weeks <br />2.381 months <br />) | |
| Opened: | Gayle Elliott 14:28 Jul 13, 2022 |
| NRC Officer: | Thomas Herrity |
| Last Updated: | Jul 13, 2022 |
| 55993 - NRC Website | |
Framatome Anp with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 571862024-06-21T04:00:00021 June 2024 04:00:00
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