ENS 55551
ENS Event | |
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04:00 Jun 18, 2021 | |
Title | Part 21 Report - Failure of a Basler Electric Transformer in a York Temperature Control Module |
Event Description | The following is a synopsis of information received via facsimile:
On June 18, 2021, STP Nuclear Operating Company returned a York TCM-1A temperature control module with the reported issue that the module would not respond in auto or manual vane control and that internal relays 1R and 2R would not pick up. The subject temperature control module was previously returned by STP Nuclear Operating Company to United Controls International (UCI) for refurbishment and modification, after which it was returned by UCI to STP Nuclear Operating Company on March 13, 2017. Troubleshooting performed by UCI identified that the secondary of the Basler Electric BE13410001 transformer that is used to isolate and step down the input voltage from 115V AC to 22V AC had an open circuit. When the subject transformer was bypassed, the module operated as designed. UCI is unable to determine the cause of the transformer failure. Post refurbishment/modification testing performed by UCI included verifying functionality of the unit before and after performance of a 48 hr. burn-in period. The only facility that is listed as being affected is STP Nuclear Operating Company. If you have any questions or wish to discuss this matter or this report, please contact: Wesley Hickle, Engineering Manager, whickle@unitedcontrols.com, 470-610-0870. |
Where | |
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United Controls International Norcross, Georgia (NRC Region 2) | |
Organization: | United Controls International |
Reporting | |
10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
Time - Person (Reporting Time:+3181.23 h132.551 days <br />18.936 weeks <br />4.358 months <br />) | |
Opened: | Rob Hale 17:14 Oct 28, 2021 |
NRC Officer: | Donald Norwood |
Last Updated: | Oct 28, 2021 |
55551 - 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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