Part 21 Report - 1998-104
ACCESSION #: 9803040316
Paul H. Kinkel
Vice President
February 17, 1998
Consolidated Edison Company of New York, Inc.
Indian Point Station Re: Indian Point Unit No. 2
Broadway & Bleakley Avenue Docket No. 50-247
Buchanan, NY 10511
Telephone (914) 734-5340
Fax: (914) 734-5923
Document Control Desk
US Nuclear Regulatory Commission
Mail Station P1-137
Washington, DC 20555
SUBJECT: 10 CFR Part 21 Written Notification
On January 14, 1998, Con Edison provided the initial notification of a
condition at Indian Point Unit No. 2 which we determined to be reportable
under the requirements of 10 CFR Part 21. The reported condition
involved several safety-related 480 Volt, Type DB-50 breakers that were
sent to an approved 10 CFR 50, Appendix B, qualified vendor for overhaul.
These breakers were returned to Indian Point Unit No. 2 and found to be
outside of the manufacturer's specified tolerances. The requirements of
10 CFR 21.21(d)(4) identify specific information to be included in a
written notification following the initial notice. That information is
provided in the attachment to this letter.
Should you have any questions regarding this matter, please contact Mr.
Charles W. Jackson, Manager, Nuclear Safety and Licensing.
Very truly yours,
CC: Mr. Hubert J. Miller
Regional Administrator - Region I
US Nuclear Regulatory Commission
475 Allendale Road
King of Prussia, PA 19406
Mr. Jefferey F. Harold, Project Manager
Project Directorate I-1
Division of Reactor Projects I/II
US Nuclear Regulatory Commission
Mail Stop 14B-2
Washington, DC 20555
Senior Resident Inspector
US Nuclear Regulatory Commission
PO Box 38
Buchanan, NY 10511
ATTACHMENT
Nuclear Logistics, Inc. 480 Volt Breaker Overhaul Work
The following information is provided as required by 10 CFR 21.21 (d)(4).
(i) Name and address of individual informing the Commission.
Paul H. Kinkel, Vice President - Nuclear Power
Consolidated Edison Company of New York, Inc.
Indian Point Unit No. 2
Broadway and Bleakley Ave.
Buchanan, NY 10511
(ii) Identification of the basic component which contains a defect.
Component: 480 Volt Breaker
Breakers - CCP 2051-002 - component cooling
pump breaker
AFP-CSP 2008-005 - auxiliary
feedwater or
containment spray
pump breaker
CRF 2035-004 - containment
recirculation fan
breaker
Model: Type DB-50
(iii) Identification of the firm supplying the basic component which
contains a defect.
Nuclear Logistics, Inc.
7461 Airport Freeway
Ft. Worth, Texas 76118
(iv) Nature of the defect and the safety hazard which could be
created by such a defects.
In late July 1997, three DB-50 breakers were sent by Con Edison
to National Switchgear Systems, Inc. (NSSI) for overhaul under
the super-vision of Nuclear Logistics, Inc. (NLI). These
breakers were originally manufactured by Westinghouse. When
these breakers were returned following overhaul in late
September 1997, anomalies were found during the performance of
Station Preventive Maintenance Procedure (PM) BRK-B-002A,
Revision 12. These anomalies are described below:
1. Breaker CCP 2051-002 had a jumper missing that prevented
the breaker alarm switch from being reset from the Central
Control Room (CCR). This jumper was missed when it was
disconnected during the final check of the auxiliary
switches and was not reconnected. This missing jumper
would not have prevented the breaker from performing its
intended functions, but it would not have permitted
resetting the alarm switch from the CCR to re-establish
the breaker closing circuit. An operator would have to be
dispatched to the 480 VAC Room to manually reset the alarm
switch for the breaker to close upon the next close
signal.
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Nuclear Logistics, Inc. 480 Volt Breaker Overhaul Work
2. While manually closing Breakers AFP-CSP 2008-005 and CRT
2035-004, intermittent binding of the breaker roller
bearing was found. The intermittent binding of the roller
bearing occurred when the roller bearing jammed as the
breaker was manually closed but then dropped when the
breaker was tripped. This binding became more consistent
as the breaker was manually exercised. The bearing outer
surface was found to be scored, indicating unusual wear.
Although this roller bearing anomaly did not affect the
electrical operation of the breaker, this anomaly could
affect the manual tripping of the breaker.
3. The left side A phase "G" gap of Breaker AFP-CSP 2008-005
was measured at 0.100", which was greater than the 0.050"
to 0.093 " tolerance as specified by the breaker
manufacturer. The right side A phase "G" gap was measured
at 0.065", which was within specified tolerance. When
this breaker was inspected at NLI, the "as-left"
measurement was 0.082" for both the right and the left
side, which was within specification. This excessive gap
would have resulted in an increased force being exerted on
the arc and main contacts in closing the breaker.
However, the breaker manufacturer indicated that the gap
would have to be significantly higher to prevent the
breaker from closing. Although the "G" gaps can vary
slightly with cycling of the breaker, this variation can
not account for a 0.018 change.
A Con Edison Quality Assurance surveillance report, performed
after the anomalies were discovered during the Station PM's,
identified several discrepancies (missing signatures) in NLI's
inspection documentation that may have compromised the NLI
independent review and led to the discovered breaker anomalies.
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