ML19339D023
| ML19339D023 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 02/09/1981 |
| From: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8102170025 | |
| Download: ML19339D023 (2) | |
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4 SOUTH CAROLINA ELECTRIC a gas COMPANY l
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CotumelA, SouTu CanouNA 29218 we,p.f. iI. Esc.,,
February 9, 1981 ug.. c.aw..
4 Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II, Suite 3100 101 Marietta Street, N. W.
Atlanta, Georgia 30303 4
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Subject:
Virgil C. Summer Nuclear Station Docket No. 50/395 Reportable Substantial Safety Hazard No Isolation Device for Field Circuit Nuclear Eng. File 3.1051
Dear Mr. O'Reilly:
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On January 29, 1981, a substantial safety hazard as defined by 10CFR21 was reported to Mr. John Rausch at the NRC Region II Office. The item involved the addition of a non-safety related instrumentation loop in the Nuclear Steam Supply System protection cabinets without installing the necessary isolation i
devices for separation. Details are given on the attachment.
The item is being reported under our 10CFR50.55(e) procedure. This is con-sidered a final report on the matter.
Very truly yours, r
T. C. Nichols, Jr.
l JAW:TCN:glb Attachment cc:
V. C. Summer w/o attachment J. L. Skolds-G. H. Fischer w/o attachment B. A. Bursey T. C. Nichols,'Jr. w/o attachment O. S. Bradham E. H. Crews, Jr.
H..E. Yocom
- 0. W. Dixon, Jr.
R. A. Wiesemann C. A. Price Document Management Branch i
D. A. Nauman (55e/21/LER.Only)
W. A. Uilliams, Jr.
I6E'(Washington)
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R. B. Clary ISEG gf
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A. R. Koon NPCF/Whitaker A. A. Smith File
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H. N. Cyrus J. B. Knotts.Jr.
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i 8102.1700M p
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i 10CFR 21 - SUBSTANTIAL SAFETY IIAZARD 1.
Name and Address of Reporting Individual James A. Wactor i
South Carolina Electric and Gas Company P. O. Box 764 i
Columbia, South Carolina 29218 i
2.
Identification of Basic Component Nuclear Steam Supply System (NSSS) Protection Cabinet 3.
Identification of Firm Supplying Component Westinghouse Electric Corporation i
4.
Nature of Defect, Substantial Safety Hazard Created, and Evaluation The architect-engineer requested the manufacturer to relocate a balance of plant (BOP) instrument loop in the NSSS protection cabinets because:
of a space problem. In making this change, the isolation normally pro-vided in the protection cabinets was not added. This lack of separation could have permitted a fault in a non-safety related control signal cir-cuit to propagate to the protection circuits.
i 5.
Date Information of Defect Was Obtained January 14, 1981-6.
Number and Location of Defect
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There were two instrument loops involved in one cabinet.
- 7. ' Corrective Action The loops are being removed from the protection cabinets and placed in BOP i
cabinets.
8.
Advice to Purchasers or Licensees None.
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