ML19339D023

Final Deficiency Rept Initially Reported on 810129 Re Addition of nonsafety-related Instrumentation in NSSS Cabinets W/O Installation of Necessary Isolation Devices for Separation

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

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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.

4 Atlanta, Georgia 30303 i i

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:

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 i

C. A. Price Document Management Branch '

', D. A. Nauman (55e/21/LER.Only)

W. A. Uilliams, Jr. I6E'(Washington)

/ R. B. Clary ISEG gf

[ A. R. Koon NPCF/Whitaker

A. A. Smith File .

H. N. Cyrus J. B. Knotts .Jr.

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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.

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5. Date Information of Defect Was Obtained January 14, 1981-

6. Number and Location of Defect

{. There were two instrument loops involved in one cabinet.

7. ' Corrective Action i The loops are being removed from the protection cabinets and placed in BOP cabinets.

8. Advice to Purchasers or Licensees None.

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