ENS 49932
ENS Event | |
|---|---|
04:00 Mar 18, 2014 | |
| Title | Part 21 - Thomas and Betts Printed Circuit Boards |
| Event Description | The following was received via fax:
This report documents the supply of faulty Logic Power supply assembly printed circuit boards for a Cyberex 20KVA Model AC Power Supply. These power supplies have the incorrect strap installed on the transformers of Cyberex P/N [Part Number] 30-80-56620 which potentially can lead to the transformer being loose and can cause failure of the power supply. Per the manufacturer, the band should have been made of stainless steel but the bands on the installed transformers were made of carbon steel and a corrosion resistant coating. The details of the potential failure of the power supply and the root cause are being evaluated and will be documented in the final report. UCI [United Controls International] reviewed all the orders that were supplied to the customers and determined that two UCI orders are affected and the customer was notified on the day the issue was identified. Part Number 90-41-974313 (UCI serial numbers 03996-01 -0001, -0002, -0003) and P/N 41-01-596701 (UCI serial numbers 03967-03 -0001, -0002, -0003) supplied to Public Service Electric and Gas (PSEG) are affected.
The following was received via fax: This engineering evaluation is being written to document the supply faulty Power supplies for the 20KVA Cyberex Model AC Power supply with the Cyberex part numbers 41-01-596701 and 90-41-974313. SUMMARY: UCI issued a certificate of conformance to PSEG for S/N: 003967-03-0001 thru 0003 on December 22nd 2012, to be used in safety related applications where seismic is the only design basis event. During the pre-installation testing in February 2014, PSEG identified loose transformers and a loud noise frequency whine and the power supply boards were returned to UCI. Below table lists the details of the power supplies that were returned to UCI. On February 2nd 2014, UCI has initiated part 21 evaluation to determine the root cause for the failure and evaluate if a defect existed. During the evaluation, it was determined that the transformer strap band installed on Cyberex P/N 30-801-56620 transformer at the location T501 should have been made of stainless steel but the strap band on these power supplies was made up of zinc plated carbon steel. Due to this material difference, the transformer warped and it was evident it became loose. The installation of the incorrect strap bands on the transformer apply to only one batch of manufactured PCB assemblies. The manufacturer addressed this issue since this was discovered and this was verified by UCI. UCI determined that the order along with the boards that failed pre-installation testing, were the only boards affected by this issue. The customer PSEG was notified on March 13th 2014 and the initial notification letter to NRC was sent on March 19th 2014. The above mentioned power supplies were recalled from PSEG and two power supply boards of S/N: 003996-01-0002 and 003996-01-0003 are currently at UCI for evaluation and rework. However the S/N: 003996-01-0001 board has not yet been returned to UCI by PSEG. UCI performed an XRF analysis on one of the affected power supplies per part number lot and on UCI control samples to confirm and compare the material of the transformer strap bands. EFFECT OF THE DEFECT: The installation of the incorrect transformer strap band resulted in the loosening of the transformer from the band. When installed in the system, the transformer might become loose and cause a loud whining noise. The installation of the incorrect material band on the transformer might lead to loosening of the transformer and causes whining noise when installed but no functional test failure will be observed. However, the loose transformer affects the safety function of the item during or after seismic event due to loss of structural integrity. CORRECTIVE ACTIONS PERFORMED: A UCI corrective action # CAR 14-14 was opened to document the issue found and the corrective and preventive actions taken. As a result, UCI will create two new Commercial Grade dedication procedures for P/N: 41-01-596701 and 90-41-974313 to include the material verification of the transformer bands installed on these power supplies. These new procedures will be used for the existing and future orders of these part numbers. All the affected power supply boards except S/N: 003996-01-0001 are currently at UCI undergoing rework to replace the transformer of the incorrect material strap band with a transformer of the correct (stainless steel) strap band. After rework, dedication will be performed per new dedication procedures as specified above. Notified R1DO (Burritt) and Part 21 Group via email. |
| Where | |
|---|---|
| United Controls International Norcross, Georgia (NRC Region 1) | |
| Organization: | United Controls International |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+35.6 h1.483 days <br />0.212 weeks <br />0.0488 months <br />) | |
| Opened: | Korina Looft 15:36 Mar 19, 2014 |
| NRC Officer: | Daniel Mills |
| Last Updated: | Apr 17, 2014 |
| 49932 - NRC Website | |
United Controls International with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 564692023-04-12T04:00:00012 April 2023 04:00:00
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