Event Notification Report for October 12, 2015
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/11/2015 - 10/12/2015
EVENT NUMBERS
51574
Part 21
Event Number: 51574
Rep Org: UNITED CONTROLS INTERNATIONAL
Licensee: UNITED CONTROLS INTERNATIONAL
Region: 1
City: NORCROSS State: GA
County:
License #:
Agreement: Y
Docket:
NRC Notified By: ROB HALE
HQ OPS Officer: DONALD NORWOOD
Licensee: UNITED CONTROLS INTERNATIONAL
Region: 1
City: NORCROSS State: GA
County:
License #:
Agreement: Y
Docket:
NRC Notified By: ROB HALE
HQ OPS Officer: DONALD NORWOOD
Notification Date: 12/01/2015
Notification Time: 14:53 [ET]
Event Date: 10/12/2015
Event Time: 00:00 [EST]
Last Update Date: 12/01/2015
Notification Time: 14:53 [ET]
Event Date: 10/12/2015
Event Time: 00:00 [EST]
Last Update Date: 12/01/2015
Emergency Class: NON EMERGENCY
10 CFR Section:
21.21(d)(3)(i) - DEFECTS AND NONCOMPLIANCE
10 CFR Section:
21.21(d)(3)(i) - DEFECTS AND NONCOMPLIANCE
Person (Organization):
OMAR LOPEZ (R2DO)
HEATHER GEPFORD (R4DO)
PART 21/50.55 REACTO
OMAR LOPEZ (R2DO)
HEATHER GEPFORD (R4DO)
PART 21/50.55 REACTO
PART 21 REPORT - IMPROPER SILVER PLATING DURING REFUBISHMENT OF AK-25 TYPE CIRCUIT BREAKERS
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.
Fort Calhoun Nuclear Station is the only known recipient of affected breakers. Fort Calhoun received 18 breakers that contained improperly silver plated components. 14 of these 18 circuit breakers have been returned to UCI. Four of the 18 circuit breakers have been installed at Fort Calhoun and UCI is currently awaiting the return of these four circuit breakers.
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.
Fort Calhoun Nuclear Station is the only known recipient of affected breakers. Fort Calhoun received 18 breakers that contained improperly silver plated components. 14 of these 18 circuit breakers have been returned to UCI. Four of the 18 circuit breakers have been installed at Fort Calhoun and UCI is currently awaiting the return of these four circuit breakers.