ENS 57827: Difference between revisions
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| NRC officer = Kerby Scales | | NRC officer = Kerby Scales | ||
| event date = 05/21/2025 00:00 EDT | | event date = 05/21/2025 00:00 EDT | ||
| last update date = | | last update date = 11/20/2025 | ||
| title = Part 21 Interim Report of Deviation | | title = Part 21 Interim Report of Deviation | ||
| event text = The following is a synopsis of information provided by Curtiss-Wright (CW) via email: | | event text = The following is a synopsis of information provided by Curtiss-Wright (CW) via email: | ||
| Line 29: | Line 29: | ||
4600 East Tech Drive | 4600 East Tech Drive | ||
Cincinnati, OH 45245 | Cincinnati, OH 45245 | ||
mpapke@curtisswright.com | mpapke@curtisswright.com | ||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/ | * * * UPDATE ON 9/23/25 AT 0850 EDT FROM MARGIE HOVER TO KAREN COTTON * * * | ||
The following information was provided by Curtiss-Wright (CW) via email: | |||
On 6/26/2025 CW sent the relays to NAMCO for repair and the parts were returned to CW on June 26. CW retested the limit switches and one failed for the same issue as noted earlier, the failed limit switch was returned to NAMCO for a full evaluation. | |||
The failure is still under investigation and CW has been in communication with NAMCO, the manufacturer. | |||
Once the evaluation is complete this report will be updated. CW anticipates an update to this notification with final results on 11/24/2025. | |||
Notified R3DO (Szwarc) and the Part 21/50.55 Reactors group | |||
* * * UPDATE ON 11/21/25 AT 1635 EDT FROM MARGIE HOVER TO JORDAN WINGATE * * * | |||
The following information was provided by Curtiss-Wright (CW) via email: | |||
The NAMCO evaluation/report issued to CW on September 4, 2025, concluded that the failure was caused by improper sizing of the hub on the top of the shuttle/slide assembly. The hub was too small which prevented proper fit with the latch and, therefore, the switch could not open or close as intended. | |||
NAMCO confirmed that this failure was only reported on PN: EA700-80926, Date Code: 0425 and also confirmed that the design of PN: EA700-80926 nor supplier of the shuttle/slide assembly has not changed in many years. NAMCO has changed their supplier for the shuttle/slide assembly since the manufacture of PN: EA700-80926, Date Code: 0425. It should also be noted that NAMCO now performs the slow latch test as stated above on all limit switches, not just the E700 series. | |||
To address this issue, CW will be revising all affected NAMCO limit switches' dedication plans to incorporate the slow latch test. CW recommends that end users should perform slow latch testing as a part of their bench or field test procedures upon receiving any Namco limit switches. These actions should preclude a possible recurrence of this failure mechanism. | |||
Please note that CW has not supplied P/N: EA700-80926 of the impacted date code 0425 to any other end users. | |||
Notified R3DO (Orlikowski) and the Part 21/50.55 Reactors group | |||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20251121en.html#en57827 | |||
}} | }} | ||
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Latest revision as of 07:20, 21 November 2025
| Where | |
|---|---|
| Curtiss Wright Flow Control Co. Cincinnati, Ohio (NRC Region 3) | |
| Organization: | Curtiss Wright Flow Control Co. |
| Reporting | |
| 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
| Time - Person (Reporting Time:+1565.78 h65.241 days <br />9.32 weeks <br />2.145 months <br />) | |
| Opened: | Margie Hover 09:47 Jul 25, 2025 |
| NRC Officer: | Kerby Scales |
| Last Updated: | Nov 20, 2025 |
| 57827 - NRC Website | |