Semantic search
| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 53043 | 30 October 2017 04:00:00 | 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 | 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. | ||
| ENS 52736 | 8 May 2017 04:00:00 | 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | Part 21 - Interim Notification of a Potential Defect on a Printed Circuit Board | Ametek Solidstate Controls began a 10 CFR Part 21 evaluation after receiving notification from NextEra Energy Seabrook Station that a 7.5kVA Inverter would prematurely transfer to alternate source at 27A load during commissioning. The X202 Crest factor board (80-9213516-90) was replaced and the unit operated normally. Analysis of the failed X202 Crest Factor board identified an SCR on the printed circuit board was turning on prematurely and resulted in a transfer to alternate source or with the absence of the alternate source, to a dead bus. A capacitor was placed across the SCR on the X202 board to protect the SCR from dv/dt turn on. Subsequent testing determined the added capacitor corrected the anomaly. In addition to Seabrook, Ametek has recently experienced similar anomalies on two separate occasions. However, these occurrences were discovered during manufacturing and in-house testing phase for new product and were attributed to a SCR failure, excessive noise, and long leads. ACTION RECOMMENDED: Ametek Solidstate Controls recommends installing a 0.22 microfarad capacitor p/n 80-134734-90 across X202 terminals J1-11 to J1-12. This capacitor will have no effect on EMI or seismic qualifications. If you wish to acquire the 80-134734-90 capacitor, Ametek Solidstate Controls will work with you to provide spare parts. 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
The following information was excerpted from an Ametek Solidstate Control email: Ametek Solidstate Controls began a 10 CFR Part 21 evaluation after receiving notification from NextEra Energy Seabrook Station that a 7.5kVA Inverter would prematurely transfer to alternate source at 27A load during commissioning. The X202 Crest factor board (80-9213516-90) was replaced and the unit operated normally. Analysis of the failed X202 Crest Factor board identified an SCR on the printed circuit board was turning on prematurely and resulted in a transfer to alternate source, or with the absence of the alternate source, to a dead bus. A capacitor was placed across the SCR on the X202 board to protect the SCR from dv/dt turn on. Subsequent testing determined the added capacitor corrected the anomaly. In addition to Seabrook, Ametek has recently experienced similar anomalies on two separate occasions. However, these occurrences were discovered during manufacturing and in-house testing phase for new product and were attributed to an SCR failure, excessive noise, and long leads. Ametek Solidstate Controls recommends installing a 0.22 microfarad capacitor, p/n 80-134734-90 across X202 terminals J1-11 to J1-12. This capacitor will have no effect on EMI, seismic, or aging qualifications. If you wish to acquire the 80-134734-90 capacitor, Ametek Solidstate Controls will work with you to provide spare parts. 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 Notified R1DO (Bower), R3DO (Daley) and Part 21 Group via email. | ||
| ENS 52384 | 26 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 | The following report was excerpted from an e-mail: Product: Ametek Solidstate Controls Analog Oscillator, printed circuit board part number 80-9230404-90 A single unit, Ametek part number 80-9230404-90, was shipped to Exelon Dresden Station on the reference purchase order has an incorrect capacitor installed. This error was identified during testing of a subsequent identical part. Ametek reviewed all printed circuit boards built under that run and verified all affected printed circuits boards less one, were still in house. This shipment was made on October 26, 2016. Ametek contacted Exelon Dresden immediately upon identification of the incorrect part installation and Exelon was able to have the board retrieved from their inventory. Ametek Solidstate Controls is submitting this notification as a precaution under the requirements of 10 CFR Part 21, but considers it a limited incident as the single defective part was isolated and the board is in the process of being returned. No further action is required and this notification does not affect any other installation, client, inventory, or equipment provided by Ametek.
The following report is an excerpt from an email received: Ametek reviewed all the printed circuit boards built under that run and verified all affected printed circuits boards less one, were still in house. The single affected board was shipped to Exelon Generation Company, Byron warehouse on purchase order # 00588294 and Ametek sales order #46001912. This shipment was made on October 26, 2016. Ametek contacted Exelon Byron immediately upon identification of the incorrect part installation and Exelon was able to have the board retrieved from the inventory. Notified R3DO (McCraw) and Part 21/50.55 (via email). | ||
| ENS 41761 | 7 June 2005 04:00:00 | 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation | Part 21 Report Involving a Potential for Premature Failure of Control Rod Instrumentation Power Supply | Ametek Solid State Controls produces AC-DC power supplies that are used at several nuclear power plants. Ametek states that its Series AC-DC power supplies may have a problem with premature failure. The specific Model Numbers affected are as follows: 85-RP1510-00 85-RP4804-00 85-RP4808-00 85-RP DUAL-4807\1 Ametek states that an intermittent loss of continuity in a magnet wire connector may cause overheating in a lug and transformer which could eventually result in a premature failure of the power supply ( within approximately two years of initial service). The problem was discovered during testing of a power supplies by Ametek. No nuclear power plants have reported any problems with the power supplies. Ametek states that its records indicate that these power supplies were supplied to Braidwood, Byron, and DC Cook. Ametek believes that the power supplies are used for control rod instrumentation. A total of 33 power supplies have been sold but Ametek believes that most of these are not in service. Ametek recommends that these power supplies either be returned to Ametek for rework or that the affected sites request a service by an Ametek representative onsite. | Control Rod |