United States Nuclear Regulatory Commission - Protecting People and the Environment

General Information or Other Event Number: 37961
REP ORG: ABB POWER DISTRIBUTION NOTIFICATION DATE: 05/02/2001
LICENSEE: ABB POWER DISTRIBUTION NOTIFICATION TIME: 16:29[EDT]
CITY: Florence REGION: 2 EVENT DATE: 05/02/2001
COUNTY: STATE: SC EVENT TIME: [EDT]
LICENSE#: AGREEMENT: Y LAST UPDATE DATE: 05/02/2001
DOCKET: PERSON ORGANIZATION
HAROLD GRAY R1
JAY HENSON R2
MELVYN LEACH R3
NRC NOTIFIED BY: DARALL HARRIS (VIA FAX) GAIL GOOD R4
HQ OPS OFFICER: STEVE SANDIN VERN HODGE NRR
EMERGENCY CLASS: N/A
10 CFR SECTION:
CCCC 21.21 UNSPECIFIED PARAGRAPH

EVENT TEXT

NOTIFICATION OF POTENTIAL DEFECT PER 10 CFR 21 K-LINE CONTROL DEVICE CLOSE COIL HAIRPIN RETAINER

"On 01/25/01, Grand Eagle Service reported a failure to close of K-Line circuit breaker during 'as found' service testing due to a malfunctioning replacement control device. The cause of the malfunction was determined to be the use of an inadequate hairpin retainer in the control device. Specifically, the retainer on the close coil armature pivot pin becomes dislodged from its slot allowing the pin to wander from the proper position inside the armature.

"The cause of this failure was determined to be a design change oversight. In November of 1998, Engineering Change Notice number 5319 was issued specifying a change from hairpin retainer part number 53152C00 to part number 53152D00 in K-Line 708392T## series Control Device assemblies. This change was made in the interest of ease of assembly. For the purpose of this notice, this issue affects only K-Line circuit breakers which have a mechanical 'black box' control device containing an internal close coil.

"Corrective action for this incident has been taken. On February 16, 2001, ECN number 5999 was issued reversing the 1998 change and specifying the use of Hairpin Retainer part number 53152C00. All control device Assemblers and Team Leaders were informed of the ECN and trained on the use the correct hardware. All of the D type retainers were removed from the control device assembly station and replaced with the C item. Additionally, all applicable control devices in the manufacturing facility, either installed in production or completed circuit breaker units or in component stock, were pulled and reworked.

"This report of defect, once again, is only applicable to K-Line Type circuit breakers with a mechanical Control Device containing an internal close coil purchased between November 1998 and February 15th, 2001. All circuit breakers containing the defective control device are subject to this failure mode. Those control devices should be repaired or replaced as soon as feasibly possible.

"This Part 21 report is the second report regarding mechanical Control Devices that has been issued in the last six months. All replacement control devices ordered as a result of the Part 21 report dated December 20, 2000 are subject to this defect if shipped from the Florence, South Carolina manufacturing facility prior to February 16th, 2001.

"ABB will notify all customers who purchased this product."

HOO NOTE: See previous report #37663.

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