ML19352A010
| ML19352A010 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 12/23/1980 |
| From: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8102250406 | |
| Download: ML19352A010 (1) | |
Text
7>0-O/,F 03 L SOUTH CAROLINA ELECTRIC a gas COMPANY
,p most er.ver son re.
.J ColumelA. SouTM CAROLINA 292f6
_\\
\\
T. C. N f Cn 0 Ls, J R.
us o.w. o. c.uom December 23, 1980 wcuaa 0.e.anons Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II, Suite 3100 101 Marietta Street, N. W.
Atlanta, Georgia 30303
Subject:
Virgil C. Sum =er Nuclear Station Potential Substantial Safety Hazard Interim Report - 10CFR21 Nuclear Engineering File 3.1051 Docket No. 50/395
Dear Mr. C*Reilly:
On November 26, 1980, Mr. Bob McFarland of NRC Region II was notified of a potential substantial safety hazard on the subject: Defective 480 Switchgear Trip Units. The report was =ade by Mr. J. A. Wactor.
The problem 2volved two 480 volt circuit breaker " Power Shield" trip units manufacturec by Gould-Brown Boveri. The trip units tested good on the test enuipment, but tripped when the motors were started. New trip units were instalan,d and no tripping occurred. The defective units were returned to the manufacturer for further testing.
A preliminary report from the manufacturer indicated there was a loose connection on one unit and some contamination on the other. The cause of the problems have not yet been decernined.
The manufacturer is continuing to evaluate the units and will provide a more detailed report. We expect to have the report by mid January and a final report should be iesued by January 23, 1981.
{0/7 Very truly yours, p
~
k
~
T. C. Nichols, Jr.
/0 JAW:TCN:glb cc:
B. A. Bursey O. W. Dixon, Jr.
FPCF/Whitaker V. C. Summer J. B. Knotts, Jr.
File G. H. Fischer R. B. Clary W. A. Williams, Jr.
A. R. Koon T. C. Nichols, Jr.
A. A. Smith E. H. Crews, Jr.
J. L. Skolds D. A. Naism n I&E (Washington)
O. S. Bradham Document Management Branch (55e/21/LER Only) gMC W.
- 8102250406 g