Information Notice No. 85-64: BBC Brown Boveri Low-voltage K-line Circuit Breakers, with Deficient Overcurrent Trip Devices Models OD-4 and 5
SSINS No. 6835
IN 85-64
UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF INSPECTION AND ENFORCEMENT
WASHINGTON, D.C. 20555
July 26, 1985
Information Notice No. 85-64: BBC BROWN BOVERI LOW-VOLTAGE K-LINE
CIRCUIT BREAKERS, WITH DEFICIENT
OVERCURRENT TRIP DEVICES MODELS OD-4 AND
5
Addressees:
All nuclear power reactor facilities holding an operating license (OL) or a
construction permit (CP).
Purpose:
This information notice is to alert licensees that BBC Brown Boveri
low-voltage K-line circuit breakers with overcurrent trip device models OD-4
and OD-5 may have been manufactured with an incorrect short time delay band
lever (link). It is expected that licensees will review the information for
applicability to their facilities and consider actions, if appropriate, to
preclude the use of the defective overcurrent trip devices. However,
suggestions contained in this information notice do not constitute NRC
requirements; therefore, no specific action or written response is required.
Description of Circumstances:
On May 13, 19851 BBC Brown Boveri Inc. (BBC) made a 10 CFR Part 21 report to
the NRC concerning a deficiency in the Models OD-4 and OD-5 overcurrent trip
devices installed on K-line circuit breakers. The affected breakers were
manufactured by BBC from October 1983 to March 1985 and may have incorrect
short time delay band levers (links) installed in electromechanical
overcurrent trip device models OD-4 and OD-5. The incorrect link could limit
the travel of the short time armature and cause the short time element to be
inoperative in the maximum (MAX) band.
Discussion:
The May 13, 1985, 10 CFR Part 21 report from BBC recommended that all K-line
circuit, breakers with the OD-4 and OD-5 overcurrent trip devices and any
spare OD-4 and OD-5 overcurrent trip devices that were manufactured between
October 1983 and March 1985, be inspected for an incorrect short time delay
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IN 85-64
July 26, 1985
Page 2 of 2
band link. Licensees known by BBC to have purchased K-line breakers or spare
OD-4 or OD-5 overcurrent trip devices were notified of the possible defect
and instructions provided for their inspection. Enclosed is a list of
utilities and related facilities that were notified by BBC. However, BBC
advised the NRC that there is a possibility that other utilities could be
using K-line circuit breakers with the suspect OD-4 and OD-5 overcurrent
trip devices. Therefore, all licensees are being notified of this possible
defect.
For facilities not on the list and using BBC K-line circuit breaker; with
OD-4 and OD-5 overcurrent trip devices that were purchased between October
1983 and March 1985, it is suggested that BBC Brown Boveri Switchgear
Products Group be contacted for information on performing the inspections
and corrective action.
No specific action or written response is required by this notice. If you
have any questions regarding this notice, please contact the Regional
Administrator of the appropriate NRC regional office or this office.
Edward L. Jordan Director
Division of Emergency Preparedness
and Engineering Response
Office of Inspection and Enforcement
Technical Contact: L. B. Parker, IE
(301) 492-7190
Enclosures:
1. Utilities/Facilities Notified by BBC Brown Boveri
2. List of Recently Issued IE Information Notices
.
Attachment 1
IN 85-64
July 26, 1985
Page 1 of 1
Utilities/Facilities Notified by BBC Brown Boveri
1. Public Service of New Hampshire/Seabrook
2. Philadelphia Electric/Peach Bottom
3. Niagara Mohawk/Nine Mile Point 2
4. Duquesne Light/Beaver Valley
5. Cleveland Electric Illuminating/Perry
6. Gulf States Utilities/River Bend
7. Carolina Power and Light/Brunswick
8. Virginia Electric Power/Surry
9. Florida Power and Light/St. Lucie
10. Arkansas Power & Light/Arkansas Nuclear One
11. Georgia Power/Vogtle
12. Commonwealth Edison/no plant identified
13. Long Island Lighting/no plant identified
14. Kansas City Power & Light/no plant identified
15. Florida Power Corporation/no plant identified
Page Last Reviewed/Updated Tuesday, March 09, 2021