ML20077S168

RO 83-099:on 830901,w/plant in Mode 1, Train a Subcooling Monitor Declared Inoperable Due to Erratic Readings.Caused Failure of Electronic Board Low Level Data.Failed Board Replaced

ML20077S168
Person / Time
Site:	Summer
Issue date:	09/14/1983
From:	Bouknight R, Dixon O SOUTH CAROLINA ELECTRIC & GAS CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
RO-83-099, RO-83-99, NUDOCS 8309210381
Download: ML20077S168 (22)

Text

SOUTH CAROLINA ELECTRIC & GAS COMPANY post OpriCE 764 cowu va. sours ca,ousa 2sais O. W. OlXoN, JR.

vics enesiosur N g g P l *. I 3 sucts*= o.s aricas September 14, 1983 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 Thirty Day Written Report LER 83-099

Dear Mr. O'Reilly:

Please find attached Licensee Event Report #83-099 f or Virgil C.

Summer Nuclear Station. This Thirty Day Report is required by Technical Specification 6.9 1.13. (b) as a result of entry into Action Statement (a) of Technical Specification 3 3.3.6, " Accident Monitoring Instrumentation," on September 1, 1983 Should there be any questions, please call us at your convenience. J Very truly youre ,

s

0. W. Dixon, J r.

RJB:0WD/mac Attachment cc: V. C. Summer C. L. Ligon (NSRC)

E. H. C rews , J r. G. J. Braddick T. C. Nichols, J r. ,/0. W. Dixon, J r. J. C. Miller E. C. Roberts J. L. Skolds H . N . Cy ru s J. B. Knotts , J r.

Group / General Managers I&E (Washington)

Document Management O. S. Bradham R. B. Clary Branch C. A. Price INPO Records Center A. R. Koon NPCF D. A. Lavigne File (Lic./Eng.)

J. F. Heilman

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o l2 j l On Septombor 1,1983. with the Plant in Made 1, "A" Train Subcooling Monitor was l l o l3 l l declared inoperable due to erratic readings. Technical Specification 3.3.3.6, l j o j 4 l l " Accident Monitoring Instruentation," requires that this instrumnt be operable l l o ls l l in Mades 1, 2, and 3. Were were no adverse consequences due to this event. l l o ls l l "B" Train Subcooling Manitor was operable and the Licensee conplied with Action l j o l 2 j l Stateent. (a) of the aforement.ioned Technical Specification. l lo is ll l av.- =:: .::m. ..... ..t,.... .::::.. .::m.

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a 0lo n u n = .i CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l 110 l l The cause of this event was due to the failure of an electronic board (Low Level' l l 1 l 1 l l Data) . W e failed board was replaced. We applicable surveillance test was l l 112 l l performed and the unit was declared operable SepteTber 2,1983. Total tim l l113ll inoperable was 28.25 hours2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />. W is failed board will be returned to the vendor j 1114 l l for additional evaluation as to the cause of the failure and reconmrded action. ~

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