ENS 51574: Difference between revisions
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| event date = 10/12/2015 EST | | event date = 10/12/2015 EST | ||
| last update date = 12/01/2015 | | last update date = 12/01/2015 | ||
| title = Part 21 Report - Improper Silver Plating During Refubishment | | title = Part 21 Report - Improper Silver Plating During Refubishment of Ak-25 Type Circuit Breakers | ||
| event text = The following information is a synopsis of information received via E-mail: | | event text = The following information is a synopsis of information received via E-mail: | ||
During refurbishment of General Electric AK-25 type circuit breakers (P/N's: AK-2A-25-1, AK-3A-25-1, and AK-7A-25-1) by United Controls International (UCI), non-current carrying/non-copper based components of the upper stud assembly were silver plated. Bubbling of the silver plating was later noted which is an indication that the plating material was not adhering to the base metal. Flaking of the silver plating material may occur and may introduce conductive foreign material into the host circuit breaker. Introduction of this conductive material could create the possibility of a short circuit of the current sensor terminal board for circuit breakers configured with RMS-9 trip units and subsequent failure of the circuit breaker. | During refurbishment of General Electric AK-25 type circuit breakers (P/N's: AK-2A-25-1, AK-3A-25-1, and AK-7A-25-1) by United Controls International (UCI), non-current carrying/non-copper based components of the upper stud assembly were silver plated. Bubbling of the silver plating was later noted which is an indication that the plating material was not adhering to the base metal. Flaking of the silver plating material may occur and may introduce conductive foreign material into the host circuit breaker. Introduction of this conductive material could create the possibility of a short circuit of the current sensor terminal board for circuit breakers configured with RMS-9 trip units and subsequent failure of the circuit breaker. | ||
Latest revision as of 20:46, 1 March 2018
| 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:+1208.88 h50.37 days <br />7.196 weeks <br />1.656 months <br />) | |
| Opened: | Rob Hale 14:53 Dec 1, 2015 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Dec 1, 2015 |
| 51574 - NRC Website | |