ML20087D005

Special Rept Spr 84-003:on 840125,seismic Instrument IYM-1783 Removed from Svc to Verify Calibr.Caused by Damaged Integrated Circuit Chip.Mod Change,Reinstallation & Testing in Progress

ML20087D005
Person / Time
Site:	Summer
Issue date:	03/05/1984
From:	Dixon O SOUTH CAROLINA ELECTRIC & GAS CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
SPR-84-003, SPR-84-3, NUDOCS 8403130260
Download: ML20087D005 (2)

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^* 2 SOUTH CAROLINA ELECTRIC & GAS COMPANY post oppice 7ee COLUMSIA. south CARoWNA 29218 O, W. DixON, JR. ,

Nuc An O MAT NS March 5, 1984 Mr. James P. O'Reilly

' Regional Administrator U.S. Nuclear Regulatory Commission ,

Region II, Suite 2900

'101 Marietta Street, N.W.

Atlanta, Georgia 30303

SUBJECT:

Virgil C. Summer Nuclear Station Docket No. 50/395 Operating License No. NPF-12 Special Report (SPR 84-003)

Dear Sir:

Please find attached a Special Report for the Virgil C. Summer Nuclear Station. This Report is required by Technical Specification 6 9 2 as a result of entry into Action Statement (a) of Technical Specification 3 3 3 3, " Seismic Instrumentation," on January 25, 1984 Should there be any questions, please call us at your convenience.

Ver truly yours, O. W. ixo , .

RBJ:0WD/dwf Attachment

-cc: 'V. C. Summer C. L. Ligon (NSRC)

T. C. Nichols, Jr./0. W. Dixon, Jr. K. E. Nodland E. H. Crews, Jr. R. A. Stough E. C.-Roberts G. Percival W. A. Williams, Jr. C. W. Hehl D. A. Nauman J. B. Knotts, Jr.

Group Managers I&E Washington

0. S. Bradhsm Document Management C. A. Price Branch I) . A. Lavigne INPO Records Center J. F. Heilman NPCF File 8403130260 840305 OFFICIAI. COPY PDR ADOCK 05000395 S PDR g b 7- .

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Mr.. James P. O'Reilly SPR 84-003 Page-Two March 5, 1984 EVENT DESCRIPTION On January 25,.1984, I&c. personnel. removed seismic instrument IYM-1783, Reactor Building Foundation-Triaxial Response Spectrum Recorder, from service to verify calibration. It had been identified that the " Field Standard" test equipment (Spring Scale) used on the previous calibration (August 22, 1983) was out of tolerance when the periodic calibration was performed. All settings in which the spring scales were used were found to be in

' tolerance. However, it was identified by the I&C personnel that one of the integrated circuit chips was damaged, and the surveillance test procedure could not be satisfactorily completed.

-The damaged chip is part of a redundant circuit which provides annunciation to the. Main Control Board.

.The I&C personnel were' aware that.a vendor recommended modification was in review which includes deletion of this redundant circuitry; therefore, no repairs were made at that

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' time.

On February 7,1984, final approval was received to initiate the modification change. . Site personnel began the modification and difficulty was encountered, at which time a technical vendor representative was requested to assist in the modification.

1The vendor representative arrived on site Monday, February 27, 1984. At present, work is in progress and it has been estimated that the modification, reinstallation, and the applicable testing will be completed by March 15, 1984.

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