United States Nuclear Regulatory Commission - Protecting People and the Environment

ACCESSION #: 9904210170


April 15, 1999
RC-99-0087

SCE&G
A SCANA COMPANY

Gary J. Taylor
Vice President
Nuclear Operations

Document Control Desk
U. S. Nuclear Regulatory Commission
Washington, DC 20555

South Carolina Electric & Gas Co
Virgil C. Summer Nuclear Station
P. O. Box 88
Jenkinsville, South Carolina
29065
803.345.4344
803.345.5209
http://www.scana.com [EXIT]

Gentlemen:

Subject: VIRGIL C. SUMMER NUCLEAR STATION
DOCKET NO. 50/395
OPERATING LICENSE NO. NPF-12
INTERIM REPORT PURSUANT TO 10 CFR PART 21
(SSH 99-0001)

South Carolina Electric & Gas (SCE&G) submits this letter in accordance with the requirements of 10 CFR 21.21 (a)(2) as an interim report of an identified defect potentially associated with a substantial safety hazard.

On February 18, 1999, Nonconformance Notice (NCN) 99-0110 was initiated to address the failure to close during surveillance testing of the circuit breaker located in cubicle 14 of XSW1DB. The breaker attempts to close, but as the mechanism starts to move, it immediately collapses back to the open position.

An on site inspection by SCE&G personnel and a GE field representative determined the following:

1. The positive interlock angle was incorrect
2. The gap between the positive interlock plates and the upper link pin was incorrect.
3. The gap in (2) above was inconsistent between the right and left sides.
4. The plates and the pin showed some evidence of contact.

During a conference call with the GE Magne-Blast engineer in Philadelphia and the Atlanta GE shop, it was unclear how this alignment problem could be present because the positive interlock linkage is all drilled and pinned at the factory. The breaker was returned to the GE factory in Philadelphia, where it was determined found that one of the levers in the positive interlock linkage was flipped 180 degrees. The problem was corrected, however, the breaker still experienced the same problem of failing to latch closed.


NUCLEAR EXCELLENCE - A SUMMER TRADITION!

Document Control Desk
SSH 990001
RC-99-0087
Page 2 of 2

Following further discussions with GE, the breaker was shipped to the Atlanta GE service shop for additional evaluation and root cause determination. As the root cause evaluation will not be completed within the 60 day reporting period, an interim report is being submitted to allow additional troubleshooting and cause determination by the vendor. The vendor anticipates that the problem with the breaker will be identified and a response should be provided to VCSNS by 8/13/99. A final report on the Part 21 evaluation will be submitted within thirty days of receipt of the vendor's information.

Should you have any questions, please call Mr. Jeffrey Pease at (803) 345-4124.

Very truly yours,

Gary J. Taylor

JWP/GJT/dr

cc: J. L. Skolds
W. F. Conway
R. R. Mahan
R. J. White
L. A. Reyes
L. M. Padovan
J. B. Knotts, Jr.
NRC Resident Inspector M. N. Browne
R. E. Slone
INPO Records Center
NSRC
RTS (SSH 990001)
File (818.18)
DMS (RC-99-0087)


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