ENS 57654: Difference between revisions
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| NRC officer = Robert A. Thompson | | NRC officer = Robert A. Thompson | ||
| event date = 04/07/2025 00:00 EDT | | event date = 04/07/2025 00:00 EDT | ||
| last update date = 04/ | | last update date = 04/09/2025 | ||
| title = Part 21 - General Electric Time Delay Relay Failure | | title = Part 21 - General Electric Time Delay Relay Failure | ||
| event text = The following is a summary of the information provided by the licensee via email: | | event text = The following is a summary of the information provided by the licensee via email: | ||
This is a report made in accordance with 10 CFR Part 21.21 on a failure of a Curtiss Wright (CW) supplied General Electric (GE) time delay relay. | This is a report made in accordance with 10 CFR Part 21.21 on a failure of a Curtiss Wright (CW) supplied General Electric (GE) time delay relay. | ||
On 12/10/24, Constellation notified CW about the failure of the relay. Constellation stated the relay failed a planned maintenance test. The induction disc was unable to complete the full travel towards the under-voltage trip due to obstruction from the stationary contact, which slipped down along the shaft upon which it was mounted, and made contact with the induction disc. | On 12/10/24, Constellation notified CW about the failure of the relay. Constellation stated the relay failed a planned maintenance test. The induction disc was unable to complete the full travel towards the under-voltage trip due to obstruction from the stationary contact, which slipped down along the shaft upon which it was mounted, and made contact with the induction disc. | ||
On 2/13/25, CW received the failed | On 2/13/25, CW received the failed CW supplied GE time delay relay from Constellation. | ||
Further research discovered that LaSalle had a similar failure in 2002, but there have not been any other reported failures in the nuclear industry until this one. | Further research discovered that LaSalle had a similar failure in 2002, but there have not been any other reported failures in the nuclear industry until this one. | ||
On 4/07/25, Revision 2 of the failure analysis written by Constellation Power Labs stated similar results as those of 12/10/24. The bracket, even when fully tightened, could not hold its position on the shaft. The root cause of the failure could not be determined. | On 4/07/25, Revision 2 of the failure analysis written by Constellation Power Labs stated similar results as those of 12/10/24. The bracket, even when fully tightened, could not hold its position on the shaft. The root cause of the failure could not be determined. | ||
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Curtiss-Wright | Curtiss-Wright | ||
4600 East Tech Drive, Cincinnati, OH 45245 | 4600 East Tech Drive, Cincinnati, OH 45245 | ||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/ | * * * UPDATE ON 04/09/25 AT 0818 EDT FROM MARK PAPKE TO JOSUE RAMIREZ * * * | ||
Curtiss Wright (CW) provided a copy of the undervoltage relay failure analysis Revision 2 written by Constellation Power Labs to the Nuclear Regulatory Commission. The report included conclusions, observations, and a test plan. | |||
In addition, CW sent out a test procedure to the customer. CW has indicated that customers should perform a routine maintenance check on the contact/clamp. | |||
Affected facilities: Constellation Fleet | |||
Notified R1DO (Schussler), R2DO (Franke), R3DO (Hills), R4DO (Vossmar), and Part 21 group (Email). | |||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20250410en.html#en57654 | |||
}} | }} | ||
{{ENS-Nav}} | {{ENS-Nav}} | ||
Latest revision as of 06:20, 10 April 2025
| Where | |
|---|---|
| Curtiss Wright Flow Control Co. Cincinnati, Ohio (NRC Region 3) | |
| Organization: | Curtiss Wright Flow Control Co. |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+35.75 h1.49 days <br />0.213 weeks <br />0.049 months <br />) | |
| Opened: | Mark Papke 15:45 Apr 8, 2025 |
| NRC Officer: | Robert A. Thompson |
| Last Updated: | Apr 9, 2025 |
| 57654 - NRC Website | |