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The following is a summary of the informat … The following is a summary of the information provided by the licensee via email:</br>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.</br>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. </br>On 2/13/25, CW received the failed CW supplied GE time delay relay from Constellation.</br>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.</br>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.</br>Because CW cannot establish a root cause, the following checks are recommended:</br>1) CW has modified the dedication plan to apply mild vertical force to assure that the clamp is secure as part of the dedication process.</br>2) End users should provide a similar mechanical test to be sure that the clamp remains secure during periodic surveillance and maintenance activities.</br>These actions should preclude a possible recurrence of this failure mechanism.</br>Relay information:</br>Part number: 12IAV69A1A</br>Manufacturer's serial number: AIAV111700032</br>CW tag number: CJ678001</br>CW serial number: 03</br>Affected facilities: Unknown</br>Responsible Curtis-Wright representative:</br>Mark Papke</br>QA Manager</br>Curtiss-Wright</br>4600 East Tech Drive, Cincinnati, OH 45245</br>* * * UPDATE ON 04/09/25 AT 0818 EDT FROM MARK PAPKE TO JOSUE RAMIREZ * * *</br>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.</br>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.</br>Affected facilities: Constellation Fleet</br>Notified R1DO (Schussler), R2DO (Franke), R3DO (Hills), R4DO (Vossmar), and Part 21 group (Email).R4DO (Vossmar), and Part 21 group (Email).
04:00:00, 7 April 2025 +
57,654 +
15:45:00, 8 April 2025 +
04:00:00, 7 April 2025 +
The following is a summary of the informat … The following is a summary of the information provided by the licensee via email:</br>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.</br>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. </br>On 2/13/25, CW received the failed CW supplied GE time delay relay from Constellation.</br>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.</br>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.</br>Because CW cannot establish a root cause, the following checks are recommended:</br>1) CW has modified the dedication plan to apply mild vertical force to assure that the clamp is secure as part of the dedication process.</br>2) End users should provide a similar mechanical test to be sure that the clamp remains secure during periodic surveillance and maintenance activities.</br>These actions should preclude a possible recurrence of this failure mechanism.</br>Relay information:</br>Part number: 12IAV69A1A</br>Manufacturer's serial number: AIAV111700032</br>CW tag number: CJ678001</br>CW serial number: 03</br>Affected facilities: Unknown</br>Responsible Curtis-Wright representative:</br>Mark Papke</br>QA Manager</br>Curtiss-Wright</br>4600 East Tech Drive, Cincinnati, OH 45245</br>* * * UPDATE ON 04/09/25 AT 0818 EDT FROM MARK PAPKE TO JOSUE RAMIREZ * * *</br>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.</br>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.</br>Affected facilities: Constellation Fleet</br>Notified R1DO (Schussler), R2DO (Franke), R3DO (Hills), R4DO (Vossmar), and Part 21 group (Email).R4DO (Vossmar), and Part 21 group (Email).
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