ML19318A609

Final Deficiency Rept Re Shelf Life of Tapes Used for 480 Volt Terminations Not Being Addressed in Site Procedures. Terminations Are Being Redone.Shelf Lives Have Been Obtained & Are Included in Site Storage Procedures.Details Encl

ML19318A609
Person / Time
Site:	Summer
Issue date:	05/27/1980
From:	Crews E SOUTH CAROLINA ELECTRIC & GAS CO.
To:
References
NUDOCS 8006230455
Download: ML19318A609 (3)

Text

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SOUTH CAROLINA ELECTRIC a GAS COMPANY

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E.H. cacws, J a. CotunsiA,Soytu.> Cgl'umA"* reg * $C w

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May 27,1980 -

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Mr. James P. O'Reilly, Director '

U. S. Nuclear Regulatory Commission Region II, Suite 3100 101 Marietta Street Atlanta, Georgia 30305

Subject:

Virgil C. Summer Nuclear Station Reportable Significant Deficiency ,

Shelf Life of 480 Volt Tapes Nuclear Engineering. File 3.1051

Dear Mr. O'Reilly:

On 4/30/80, SCE&G reported a significant deficiency, as defined by 10CTR50.55(e), to NRC resident inspector Jack Skolds, on the shelf life of tapes used for 4f 3 vo terminations. Details of the deficiency and corrective action are n a the attachment. This a considered a final report on the def ed y.

Ve ruly yours, E. H. ews, Jr.

JAW:EHC:rh ec: H. T. Babb

, E. H. Crews, Jr.

O. S. Bradham D. R. Mocre --

l H. Radin  %

J. Skolds

• I V. C. Sumener NPCP/Dixon r O/ T p11e S

Document Management Branch -

Washington, D. C.

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8006230V W y

• A b 10CFR50.55(e) - SIGNIFICANT DEFICIENCY gy 'k '

1. . Identification of Nonconformance The shelf life of Kerite, Bishop, Permacel, Raychem and Scotch tapes used for

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- low voltage terminations was not addresse'd by site procedures.

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2. Number and Location of Nonconformance The nonconformance could affect any of the 480 volt power terminations inside '

the containment building. This would include safety related motors such as the reactor building cooling units and motor operated valves.

3. Significant Deficiency Created and' Evaluation (See Attached Sheet) s

4. Corrective Action j The 480 volt motor terminations are being redone. The shelf lives of the tapes a

have been obtained from the manufac(urers and are included in site storage pro-i cedures. A note is being addedot' I stallation procedures to insure that the

, shelf life of the tape being used is not eiceeded.

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10CFR50.55(e), Significant Deficiency Page Two,

. 3. Significant Deficiency Created and Evaluation , .

The result of exceeding the shelf life of the tapes is reduction of the adhesive quality. Centrol terminations and power terminatious outside of containment are covered with jacketing tapes with no concern for shelf life. The jacketing tape will hold the insulating tape in place, and therefore the termination will not fail. Power. circuits inside containment are covered with silicon rubber tape which does have a limited shelf life.

These terminations have been inspected and none have been found with poor adhesion. However, based on puzc5ase dates, there is a possibility that some of the tape had exceeded shelf life (3 years) when installed.

In worst case cond'tions, the tape could unravel and fall from the ter-T~~~~~

mination, which could result in the termination shorting out. Thie could result in failure of a safety related motor or a valve not operating which could adversely affect the safety'of the plant.

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