ENS 56469
ENS Event | |
|---|---|
04:00 Apr 12, 2023 | |
| Title | Part 21 - Schneider Electric Power Supply Hard Failures |
| Event Description | The following information was provided by the licensee via email:
On September 7, 2022, Dominion's Surry Power Station notified United Controls International (UCI) that three Schneider Electric PIN: ASP840-000 Modicon Primary/Secondary Power Supply units that were supplied by UCI in 2014 had failed after installation. Hard failures that shutdown the associated programmable logic controller were observed. The first unit was installed since June 6, 2017, and then failed in August of 2022. The second and third units failed approximately three days after installation. All units appeared to function properly at initial installation. The subject items were returned to UCI on October 19, 2022, for evaluation. Items were received at UCI with substantial shipping damage noted. One item was received with a loose transformer inside the unit. All items were received with bent or cracked cases. These issues are attributed to poor shipping practices as items were not supplied in such conditions and these issues would have been noted at receipt by the utility. Due to the complexity of the items and unavailability of design documentation for these obsolete items, further evaluation of item failures required manufacturer (Schneider Electric) evaluation. UCI returned all three items to the manufacturer for evaluation of failed components. The manufacturer was able to repair one item by replacing several capacitors, transistors, integrated circuits, and resistors; however, a specific cause of the failure could not be identified. The remaining two items were determined to be unrepairable, and cause of failure could not be identified. UCI is not capable of providing any further evaluation as to the root cause of the subject module failures. The item manufacturer Schneider Electric was also unable to provide a determination as to the cause of failure. Since the root cause of failure cannot be determined or inspected for, UCI will no longer be supplying these modules which are now obsolete. North Anna and Surry Power Station are the plants affected. |
| 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:+51.88 h2.162 days <br />0.309 weeks <br />0.0711 months <br />) | |
| Opened: | Anu Kulkarni 07:53 Apr 14, 2023 |
| NRC Officer: | Sam Colvard |
| Last Updated: | Apr 14, 2023 |
| 56469 - 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
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Schneider Electric Power Supply Hard Failures ENS 555512021-06-18T04:00:00018 June 2021 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Failure of a Basler Electric Transformer in a York Temperature Control Module ENS 547582020-05-01T04:00:0001 May 2020 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Abb/Thomas & Betts/Cyberex Printed Circuit Board Shorts to Ground When Installed in Host Battery Charger ENS 544762019-12-27T05:00:00027 December 2019 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Incorrect Tip Material Used on Gauges ENS 525792017-02-24T05:00:00024 February 2017 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Uci Terminal Boxes P/N 005650-01 Discoloration and Corrosion ENS 515742015-10-12T05:00:00012 October 2015 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Improper Silver Plating During Refubishment of Ak-25 Type Circuit Breakers ENS 499322014-03-18T04:00:00018 March 2014 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Thomas and Betts Printed Circuit Boards 2023-04-12T04:00:00 | |