ML20044E753

Interim Part 21 Rept SSH 930003 Re Three Defective Spare Model D26MR31A Type M Relays Mfg by Cutler-Hammer & Supplied by Automation Ind/Vitro Labs.All Vitro Supplied C-H Relays Placed on Hold & Two Relays Sent Off Site for Evaluation

ML20044E753
Person / Time
Site:	Summer
Issue date:	05/21/1993
From:	Skolds J SOUTH CAROLINA ELECTRIC & GAS CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-PT21-93 RC-93-0130, RC-93-130, NUDOCS 9305260091
Download: ML20044E753 (2)

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south caro,iina tiectric a ar. cornpsny gnggog.

en 6nsvdle SC 29065 Nuclear Operations SCE&G

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f*ay 21, 1993  :

Refer to: RC-93-0130 Document Control Desk

.U. S. Nuclear Regulatory Commission Washington, DC 20555 Gentlemen:

Subject:

VIRGIL C. SUMMER NUCLEAR STATION DOCKET NO. 50/395 OPERATING LICENSE N0. NPF-12 INTERIM PART 21 REPORT (SSH 930003)

South Carolina Electric & Gas Company (SCE&G) submits this letter in accordance with 10CFR21.21(a)(2) as an interim report for a nonconformance.

On March 23, 1993, Nonconformance Notice (NCN) 4637 was generated when three spare Model D2Sf1R31A type *M" relays manufactured by Cutler-Hammer and supplied by Automation IND/ Vitro Labs were found defective.

The relay contacts are enclosed in housings constructed partially or completely from General Electric (GE) Lexan (polycarbonate). The Lexan pieces have embrittled, cracked, chipped, broken, etc., and are unusable.

This condition is a hardware defect.

The Lexan pieces appear to have been chemically attacked causing the condition. Discussions with GE indicate the packaging in which the suspect relays were originally provided to SCE&G is the most likely cause of the chemical attack. The bagging was examined and both bulk manufacturers were contacted (Bell Fibre Products and Ludlow Corp.). .They create large rolls of the bagging material which is reduced by other agencies into bags for. general usage. The bulk bagging was manufactured to MIL-B-131F Type I Class 1 -

requirements calling for general purpose long term storage packaging with low ultraviolet penetration and low water vapor transmission. The~ Ludlow product ,

(Marvelseal 360) is a nylon film which requires plasticizer agents to attain the necessary properties from the nylon. The Bell Fibre product (Fo11-0-Rap FR 2175) consists of layers of polyethylene, aluminum foil, and polypropylene.

GE data suggests the polyethylene film bagging and the PVC plasticizers in  :

the nylon film bagging have observable impact on Lexan characteristics. .The >

damage witnessed is indicative of a chemical attack like a plasticizer or  ;

polyethylene would introduce.

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Document Control Desk

"'I SSH 930003 Page 2 of 2 SCELG has taken the following action:

All Vitro supplied C-H relays have been placed on HOLD.

Five of the spare relays were inspected and found defective.

It was identified that only three C-H relays supplied by Vitro were installed in the plant. Two of these have been replaced and documentation is presently being processed to replace the third relay.

Two relays have been sent off site to an independent test lab for evaluation.

The relay manufacturer and supplier have been contacted.

An examination of C-H relays in the warehouse facilities show that only the-Vitro relays are stored in this type packaging. All other C-H relays have  ;

been supplied by others. These were not provided in the suspect packaging..

SCELG expects to complete the 10CFR21 Evaluation for reportability prior to August 1, 1993.

If you require any further information, please contact Mr. Richard Bouknight at (803) 345-4085.

Very truly yours John L. Skolds RJB: led c: 0. W. Dixon J. B. Knotts Jr.

R. R. Mahan NSRC R. J. White RTS (SSH930003)

S. D. Ebneter Central File System G. F. Wunder File (818.18)

NRC Resident Inspector

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i NUCLEAR EXCELLENCE - A StM4ER TRADITION!