ENS Event | |
|---|---|
04:00 Apr 6, 2023 | |
| Title | Part 21 - Breakers Potentially Closing Following Charging |
| Event Description | The following is a synopsis of information provided by Framatome, Inc. via email:
In 2011, Framatome supplied a DS-206DC breaker that incorrectly closes at the end of the charging cycle of the closing mechanism. Such a defect could result in potential unwanted start of the load of the breaker. The cause of this issue is due to an Eaton trigger roller (Eaton part number 783A446H01) being out of round. The trigger roller is a component in the main cam assembly (Eaton part number 436B418G03). This issue was determined to be a 10 CFR 21 Defect by Framatome on April 6, 2023. Framatome has identified this and other breakers with this potential defect listed below: Calvert Cliffs / Electrical Load / DS-206, DS-416 Breakers Oconee / Reactor Trip Switchgear / DSII-516 Breakers South Texas Project / Electrical Load / DS-206, DS-416 Breakers TVA (Watts Bar and Sequoyah) / Electrical Load / DS-206, DS-416 and DS-632 Breakers Eaton made changes to their manufacturing process to correct the issue. Affected utilities will be provided an inspection procedure to determine if the defect is located in affected components that may be in storage or in operation. Also, Framatome will provide written correspondence to each customer regarding the issue and respond to technical questions regarding the issue. Affected Plants with potentially defected parts include Calvert Cliffs, Oconee, South Texas Project, Sequoyah, and Watts Bar. |
| Where | |
|---|---|
| Framatome Anp Lynchburg, Virginia (NRC Region 1) | |
| Organization: | Framatome Anp |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+36.02 h1.501 days <br />0.214 weeks <br />0.0493 months <br />) | |
| Opened: | Gayle Elliot 16:01 Apr 7, 2023 |
| NRC Officer: | Ernest West |
| Last Updated: | Apr 7, 2023 |
| 56457 - 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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