ENS 53043
ENS Event | |
|---|---|
04:00 Oct 30, 2017 | |
| Title | Part 21 - Eaton Auxiliary Switch Installed Eg Frame Molded Case Circuit Breaker Potentially Defective |
| Event Description | The following is excerpted from an email received from Ametek:
COMPONENT DESCRIPTION: Eaton auxiliary switches, catalog number AUX2A2BPK installed in EG Frame Molded Case Circuit Breakers (30A - 125A). PROBLEM YOU COULD SEE: Eaton auxiliary switches manufactured after May 2015 and installed in EG Frame Breakers (30A - 125A) could experience intermittent operation of the auxiliary switch due to a design defect of the auxiliary switch. The design defect of the auxiliary switch can result in the auxiliary switch to fail to change state during breaker operation. CAUSE: Ametek Solidstate Controls identified intermittent auxiliary switch operation during testing. Eaton confirmed a problem with the auxiliary switches used in EG Frame Breakers manufactured since May of 2015. The auxiliary switch in the EG frame breakers may not operate reliably, resulting in the auxiliary switch returning to, or staying in, its shelf state. The auxiliary switch is being redesigned to improve the mechanical interface reliability between the breaker mechanism and the auxiliary switch. EFFECT ON SYSTEM PERFORMANCE: The breaker overcurrent protection and shunt trip function are not affected by this defect. If the auxiliary switch defect occurs in the DC Input breaker (B1) while the system is operating, the static switch will transfer the load to Bypass (alternate Source) and the Inverter will shut down. If the defect occurs during startup, the Inverter will not start. If the auxiliary switch defect is present in any other breaker, it will result in a failure to annunciate a breaker closed indicator. A list of affected equipment with the breaker locations is provided below. ACTION REQUIRED: Replacement auxiliary switches from Eaton are expected to be available sometime in the second quarter of 2018. An immediate solution is not available. For circuit breakers in the B1 position, Ametek Solidstate Controls recommends replacing the auxiliary switch as soon as a redesigned auxiliary switch is available. For all other breakers, the state of the breaker should be verified prior to performing any maintenance until the auxiliary switch can be replaced. In this situation, the auxiliary switch should be replaced at the earliest convenience. AMETEK SOLIDSTATE CONTROLS CORRECTIVE ACTION: If you wish to replace the auxiliary switches, Ametek Solidstate Controls will work with you to arrange replacements. Please contact Mr. Mark Shreve of our Client Services group at 1-800- 222-9079 or 1-614-846-7500 ext. 6332. mark.shreve@ametek.com A copy [including Eaton EG Frame Part Number, Ametek Part Number, Serial Number, Equipment Part No., Customer, Breaker Location and Total] will also be provided to the affected licensees - Ameren, TVA, Southern Nuclear, Duke, and Krsko. Curtiss Wright also received eight (8) of the suspect breakers. |
| Where | |
|---|---|
| Ametek Solid State Controls Columbus, Ohio (NRC Region 3) | |
| License number: | N/A |
| Organization: | Ametek Solid State Controls |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+8.6 h0.358 days <br />0.0512 weeks <br />0.0118 months <br />) | |
| Opened: | Ethan Salsbury 12:36 Oct 30, 2017 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Oct 30, 2017 |
| 53043 - NRC Website | |
Ametek Solid State Controls with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 530432017-10-30T04:00:00030 October 2017 04:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Eaton Auxiliary Switch Installed Eg Frame Molded Case Circuit Breaker Potentially Defective ENS 523842016-10-26T05:00:00026 October 2016 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part-21 - Incorrect Capacitor Used on Circuit Boards 2017-10-30T04:00:00 | |