ML20040D855

LER 81-080/03L-0:on 811228,w/DIS-500-7 in Progress,Contacts of Time Delay Relay 590-123B/Aux Failed in Energized Position.Caused by Mechanical Binding of Actuating Mechanism.Relay Replaced

ML20040D855
Person / Time
Site:	Dresden
Issue date:	01/25/1982
From:	Morgan W COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20040D853	List: ML20040D852 ML20040D855
References
LER-81-080-03L, LER-81-80-3L, NUDOCS 8202020324
Download: ML20040D855 (2)

Text

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7 8 61 69 EVENT QATE 74 75 EVENT DESCRIPTION AND PROSA8LE CONSEGJENCES h Iol2l lDuring normal operations with the " Turbine First Stage Pressure 45% Scram Bvpass Switch l g gCalibration" surveillance (DIS-500-7) in progress, contacts of time delay relay 590-123B/ l g o g 4 g l Aux failed in the energized position. This was of minimal safety significance since the f

,,,,, gother 3 subchannels were available. There was no effect on public health or safety. Thisl i o is 1 Iw s the first occurrence of this type.  ;

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SSQuSNTIAL OCCURRENCE REPORT REVIStoN LER/Ro IEVENT YEAR REPORT No. CooE TYPE No.

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33 37 40 48 42 43 m 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l1 60l l The cause of this event was mechanical hindino nf cha nrenn*4ne mechanism which inepr- I

, gig l mittently failed to operate the contact on the 590-123B/ Aux Relav (CR-2820-B) . A reactorf l half-scram was initiated on the affected channel until the relay was replaced and tested l

,,,,, ; satisfactorily. Surveillance DIS 500-7 will continue to be performed monthly. l Islai l l i7 8 9 80

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1. $5uto . CESCRtPTioN ,$ g NRC USE ONLY 2 Iof U Qa lto N/A l l!l!Ill!IlIll$1 7 8 9 e 68 69 80 3 ayne rgan 815-942-2920, X-429 NAME OF PREPARER PHCNE: {}

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l DEVIATION REPORT O Commonwealth Edison PART Il TITLE OF DEVI ATION DvR Mo- 12 - 2 STA UNIT Turbine First Stage Pressure 140 YEAR NO.

OCCURRED l

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45% Scram Bypass Switch Calibration 12-28-81 1100 )

OATF T!ve i SYSTEM AFFECTED PLANT STATUS AT TIME OF EVENT 500 TESTING g ggg MODE Run pwR(Mar) 2264 , togoguwe, 746 O l

DESCRIPTION OF EVENT While conducting routine " Turbine First Stage Pressure 45% Scram Bypass Switch Calibration" surveillance, DIS-500-7, it was found that the contacts of time delay relay 590-123B/ Aux were sealed close, not allowing relay 590-123B to drop out.

10 CFR50.72 NRC RED PHONE O O NOTIFICATION MADE YES NO EQUIPMENT F AILURE 17763 QYEs O NO A0ax aE0uESr NO. RESPO~SiBtE SUPER < ISO. Donald C. Reiersen DATE 12-28-81 P ART 2 l 0PERATING ENGINEER'S COMMENTS Took manual half-scram on affected channel until relay problem is corrected.

O EVENT OF PUBL IC INTEREST 2 4-HOUR NRC NOTI F I CATI ON REQ'D 0 TECH. SPEC. VIOLATION TELEPH N/A NON REPORTABLE OCCURRENCE N/A TELEGM/TELECOPY O 14 DAY REPORTABLE /T.S. REGION til DATE TIME

{ 30 DAY REPORTABLE /T.S. 6 a 6

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• b CECO CORPORATE NOTI FIC ATION MADE

] ANNUAL /SPECL REPORT REQ'O IF ABOVE NOTIFICATION IS PER 10CFR21 A.I.R. #

5-DAY ARITTEN REPORT REQ'O PER 10CFR21 t,g,,, ,81-80/03L-0 TELEPH F. A. Palmer 12-29-81 0857 Ceco CORPORATE OFFICER DATE TIME PRELIMINARY REPORT CCMPLETED AND REVIE*ED T. Lane /R. Ragan 12-28-81 OPERATING ENGINEER / DATE / .

INVESTIGATED REPORT & RESOLUTION # '

ACCEP TED BY S TA TI ON REVIE4 r /. w Il2h/8.;1-- . 1- !l l1/, l 2 --

RESOLUTION APPROVED AND '

AUTHORIZED FOR DISTRIBUTION ~

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