ML20081M202

83-037/03L-0:on 831005,during Daily Battery Surveillance, 250-volt Battery Charger Float Voltage Indicated Improper Float Voltage.Caused by Defective Amplifier Board.Defective Board Replaced

ML20081M202
Person / Time
Site:	Dresden
Issue date:	11/02/1983
From:	Ata H, Scott D COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
83-1062, LER-83-037-03L-05, LER-83-37-3L-5, NUDOCS 8311170136
Download: ML20081M202 (3)

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LICENSEE EVENT REPORT i

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EVENT CATE 74 75 REPCMT QATE 80 g

EVENT DESCRIPT1CN AND PROBA8LE CONSEQUENCES h

.t o l a t l While performing daily bat terv surveillance (DOS 6900-1) it was found that Unit 3, I o i s i l 250 volt battery charger float voltage is reading 243v while the proper float vol'tage l io i A; l is 261v. The charger equalizing voltage was also checked and found to read 243v while .l 10151 l the proper equalizing voltage is 270v, Since the 250v battery and the Unit 2/3 l

't o is l l charger were operable, safety significance was minimal. Similar occur ~rence was reported ;

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il 6 01 I It was determined that the amolifier board was defective. The defective board was I i: li I i replaced and the unit w'as returned to service. The float voltace was set at 261 volts I

, ,12 ; l and the equalizing voltage was set at 270 volts. No further action is required. I i 6 31 'l I t4II i a 9 30

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,/ m D / X DEVIATION REPORT g ',' Commonwealth Edison DvR NO. 12 -

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73 N / STA UNIT YEAR NO.

PART Il TITLE OF DEYl ATION OCCURRED 10/5/83 2200 Unit 3 250v DC Battery CharOer Failure cATE TivE SYSTEM AFFECTED 6900 PLANT STATUS AT TIME OF EVENT TESTING

/ DC uoDg Shutdown , p a gu,7 3 0 . LOAD (MAE) 0 yO, g DESCRIPTION OF EVENT equalize or float charge. Unit 2/3 charger switched over to Unit 3 battery.

O 10 CFR50.72 NRC RED PHONE @

NOTIF IC ATION MADE YES NO EQUIPMENT FAILURE D30698 GYES O NO .ORx REOUEST NO. RESeONSiBtE SueERviSOn M. Korchynsky g,7g 10/5/83 PART 2 l OPERATING ENGINEER'S COMMENTS When the Unit 3 250 voit DC battery charger failed, the Unit 2/3 250 volt DC battery charger was switched into service; at that point all 250 volt DC system Technical Specification requirements were satisfied.

EVENT OF PUBLIC I N TE REST C 24-HOUR NRC NOTIFICATION REO*D TECH. SPEC. VIOLATION TELEPH N/A NON REPORTABLE OCCURRENCE TELEGM/TELECOPY N/A 14 DAY REPORTABLE /T.S. REGION lil DATE TIME

] 30 DAY REPORTABLE /T.S.

• CECO CORPORATE NOTIFICATION MADE ANNUAL /SPECL REPORT REO'D IF ABOVE NOTIFICATION IS PER IOCFR21 A.I.R. #

0 5+ DAY WRITTEN REPORT REO'D PER 10CFR21

'L.E.R. ,83-37/03L-0 Telecopy ex Dennis P. Galle 10/20/83 1359 CECO CORPORATE OFFICER DATE TIME PRELIMINARY REPORT COMPLETED AND REVIEnED T.A. Cisla 10/20/83 OPERAtlNG ENGINEER DATE iliVESTiGATED REPORT & RESOLUTION ACCEPTED BY STATION REVIEW A N* ged W

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1 November 2, 1983 DJS Ltr #83-1062

James G. Keppler, Regional Administrator Region til U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Reportable Occurrence Report #83-37/03L-0, Docket #050-249 is being submitted to your office in accordance with Dresden Nuclear Power Station Technical Specification 6.6.B.2.(b), conditions leading to operation in a degraded mode permitted by a limiting condition for operation or plant shutdown required by a limiting condition for operation.

J Co D . Scott Station Superintendent Dresden Nuclear Power Station

• DJS/kjl Er.cl osure cc: Director of Inspection & Enforcement l' Director of Management Information & Program Control

! U.S. NRC, Document Management Branch File /NRC s

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