05000237/LER-1981-046-03, /03L-0:on 810709,operator Received Downscale Alarm on Reactor Bldg,Fuel Pool & Isolation Condenser Vent Radiation Monitor.Caused by Power Loss Due to Ground on Capacitor Hi-side Lead.Capacitor Replaced

/03L-0:on 810709,operator Received Downscale Alarm on Reactor Bldg,Fuel Pool & Isolation Condenser Vent Radiation Monitor.Caused by Power Loss Due to Ground on Capacitor Hi-side Lead.Capacitor Replaced

ML20010B614
Person / Time
Site:	Dresden
Issue date:	07/24/1981
From:	Rhee S COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20010B613	List: 05000237/LER-1981-046, Forwards LER 81-046/03L-0 05000237/LER-1981-046-03, /03L-0:on 810709,operator Received Downscale Alarm on Reactor Bldg,Fuel Pool & Isolation Condenser Vent Radiation Monitor.Caused by Power Loss Due to Ground on Capacitor Hi-side Lead.Capacitor Replaced
References
LER-81-046-03L, LER-81-46-3L, NUDOCS 8108170340
Download: ML20010B614 (2)

LER-1981-046, /03L-0:on 810709,operator Received Downscale Alarm on Reactor Bldg,Fuel Pool & Isolation Condenser Vent Radiation Monitor.Caused by Power Loss Due to Ground on Capacitor Hi-side Lead.Capacitor Replaced

Event date:
Report date:
2371981046R03 - NRC Website

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NRC FO M 366

.- - --__ _ U.S. NUCLEAR REGULATORY COMMISSION.. -

mm LICENSEE EVEtlT REPORT

• CONT 50L stOCx: l l

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l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) l0 l1l lI lL lD lR lS l2 l@l 0 l 0 l - l 0 l 0 l 0 l 0 l0 l -l 0 l 0 l@l 4 l 1 l 1 l 1 l 1 l@l l

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8 60 61 coCKET NuM8ER 68 69 EVENT oATE 74 75 R EPoRT oATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o l a l lDuring normal unit operation, the unit operator received down scale alarm on Reactor

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l o 13 l l Building, Fuel Pool and Isolation Condenser Vent Radiation Monitor. The "B" Channel io,,,gleft downscale and placed in degraded equipment log. There was no effect on public g

g g ealth or safety,since redundant Channel "A" was operable. Similar event was reported h

odet M-M.

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CooE TYPE No.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i j o i lThe cause of this event was power loss due to a ground on a capacitor Hi-side lead. Thel g l capacitor was replaced and monitor operability was checked several times. The system I

lt 12i Iwas returned to normal and placed in service at 2155 hrs. No further corrective action l l1s deemed necessary.

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7 8 9 80 oTHER status @ UEoNY oiscovERY oEsCRiPrios h

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Pu8u$7Y 8108170340 810806 T Whl EsCRIPTioN h NRC USE ONLY issuto o PDR ADOCK 05000237 i NA S

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8 9 10 68 69 80 5

.I Sang J. Rhee 815-942-2920 X 526 1.l o

___NAME OF PPFPARFR

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h DEVIATION REPORT Dvn NO.

Commonwealth Ed.ison STA UNIT YEAR N O.

8 2 77

'hChannN'o[$ Bldg Vent, Fuel Pool and Isolation Condenser Vent OCCU RRED Radiation Detectors Reading Downscale 7#9#81 1R20 DAH M6 SW M AUECTED

PLANT CONDITIONS

TESTING 1700 Process Radiation Rian 731 MODE RWRfMWT)

, LOAD (MWE) gg

DESCRIPTION Of EVENT

"B" channel of the subject radiation detectors went downscale due to an apparent loss of the H.V. supply.

DESCRIPTION OF CAUSE H.V gupply was reading zero instead of 600 V as expected.

~0TH'ER APPLICABLE INFORMATION Par T.S. 3.2.E.2 the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> time limit noted,"B" channel was left in downsc. ale, placed in degraded eq2ipment log.

I.M. called in to fix the H.V. power supply.

EQUIPME 9T YES DR NO.

WR NO.

FAILURE Q NO D14615 RESPONSIBLE SUPERVISOR DATE PART 2 l OPERATING ENGINEERS COMMENTS Found crounded canacitor Hi-side lead. Repaired and trip checked satisfactorily. System was returned to normal and placed in service at 2155 hours0.0249 days <br />0.599 hours <br />0.00356 weeks <br />8.199775e-4 months <br />.

S AF ETY-TYPE OF DEVIATION EVENT OF POTENTIAL TECH SPEC NON-REPORTABLE ANNUAL RELATED REPORTABLE OCCURRENCE PUBLIC INTEREST VIOLATION OCCURRENCE REPORTING WR ISSUED IOCFR21 YES YES 14 DAY 30 DAY NOTIFICATION NO NO 6.6.B.2.b I

REPORTABLE CCCURRENCE ACTION ITEM NO.

PROMPT ON-SITE NOTIFICATION f

C. E. Sargent NUMBER i

7/13/81 1100 l

XIX-81-46/03L-0 TITLE DATE TIME TlTLE CATE TIME l

24 HOUR NRC NOTIFICATION (Courtesy)

PROMPT OFF-SITE NOTIFICATION TPH M. Jordan 7/13/81 1000 F. Palmer 7/14/81 0910

~

l REGION iII DATE TIME TlTLE DATE TIME 1

TGM REGION 1Ii & COL CATE TIME TlTLE DATE TIME RESPONSI BLE COMPANY OFFICER INFORMED vF 10 CFR 21 CONDI TIONS AND THEI R REPORT TO NRC TITLE DATE

. TIME REVI EW AND COMPLETED - T.

ng 7

8 ACCEPTANCE BY STATION REVIEW I

AS RECUIRED DATE

/

RESOLUTION APPROVED AND Mo

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AUTHORIZED FOR DISTRIBUTION 4

STAT ON SUPERINTENDENT

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