ML20081K155
| ML20081K155 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 10/31/1983 |
| From: | Dixon O SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-83-039-000 PT21-83-039-000, PT21-83-39, NUDOCS 8311090283 | |
| Download: ML20081K155 (2) | |
Text
,
a SOUTH CAROLINA ELECTRIC & GAS COMPANY.
POST OFFICE 764
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- COLUMBIA, SOUTH CAROLINA 29218 03Noy October 31, 1983 83 NOV 3 All : 368 ('
O. W. OfxON..lR.
VICE PREsf0ENT NUCLEAR OPERATIONS Mr. J. P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Ccmnission Region II, Suite 2900 101 Marietta Street, N.W.
Atlanta, GA 30303
Subject:
Virgil C. Stamer Nuclear Station OperatingLicense/
Docket No. 50/395 N6._NPF-12 Substantial Safety Hazard Main Control Board Separation Criteria P-21-83-005
Dear Mr. O'Reilly:
South Carolina Electric and Gas is reporting a substantial safety hazard as defined in 10CFR21. he hazard involved the failure to meet separation criteria on the main control board as defined in IEEE 384-1974, section 5.6.2.
Detal s are given in the attachment to this letter. 21s is considered a final report on this matter.
If you have any questions, please advise.
V
.trul our
/
O. W. Di DCH:OE/rh cc:
V. C. Summer C. L. Ligon (NSRC)
T. C. Nichols, Jr./O. W. Dixon, Jr.
G. J. Braddick E. H. Crews, Jr.
D. J. Richards E. C. Roberts NRC Resident Inspector H. N. Cyrus J. B. Knotts, Jr.
Group Managers I&E Washington O. S. Bradham Document Mangenent Branch N. E. Clark TNF0 Pecords Center C. A. Price
" "?
A. R. Koen E e (Lic./Eng. )
D. A. Iavigne i
8311090283 831031
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M' PDR ADOCK 05000395 3D.
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i 10CFR21 - SUBSTANTIAL SAFETY HAZARD 1.
Name and Address of Reporting Individual Danny Hicks South Carolina Electric & Gas Conpany P. O. Box 764 Colunbia, SC 29218 2.
Identification of Basic Carponent DC Power Circuit (TE-3X) locatal in XPN 7147, Main Control Board Termination Cabinet.
3.
Identification of Firm Supplying Conponent Gilbert Associates, Inc.
P. O. Box 1498 Reading, PA 19603 4.
Nature of Defect, Substantial Safety Hazard Created and Evaluation As a design inprovement, current limiting fuses were to be placed in series with a DC power circuit located in one of the main control board termination cabinets. Later, the architect engineer justified separation of less than six (6) inches by analysis as allowed in IEEE 384-1974, section 5.6.2.
We analysis took credit for the fuses installed in the circuit as adequate overcurrent protection against the possibility of an electrically generated fire due to conductor overheating. During an inspection of the fused feeder circuits in the main control board termination cabinets, it was discovered that these fuses were not correctly installed because the architect engineer had not revised the termination sheet used by field personnel to do the work.
5.
Date Information of Defect Was Obtained - September 22, 1983 6.
Number and Incation of Defect DC Power Circuit OCE-3X) located in XPN 7147, Main Control Board Termination Cabinet.
7.
Corrective Action We DC power circuit has been reworked to ensure that fuses are in the circuit to provide adequate overcurrent protection against the possibility of an electrically generatal fire due to conductor overheating.
8.
Advice to Purchasers or Licensees None w
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