ML20052E419

LER 82-011/03L-0:on 820403,LPCI Differential Pressure Switch 2-261-34B Declared Inoperable During Monthly Surveillance Test Dis 1500-9.Caused by Wear of Contact Point in Mechanical Linkage.Switch Adjusted

ML20052E419
Person / Time
Site:	Dresden
Issue date:	05/03/1982
From:	Bader S COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20052E414	List: ML20052E412 ML20052E419
References
LER-82-011-03L-01, LER-82-11-3L-1, NUDOCS 8205110090
Download: ML20052E419 (2)

Text

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l LICENSEE EVENT REPORT -l

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to 61 coCXET NuMS ER 68 69 EVENT oATE 74 75 REPORT oATE so EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h lol2l l During normal operation, while conducting monthly surveillance DIS 1500-9, the LPCI l gg differential pressure switch 2-261-34B was inoperable. The safety significance was mini-l gg,,,  ; mal since the remaining three redundant switches were operable. There was no effect on l

,,,3, ,the health and safety of the public. Previous occurrence: Docket 50-237/82-13. l lo is l l l 10171 l l 1o48l l _I

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h sEQuRNTI.4L OCCUR RENCE REPORT REvestoN LE R EVENT YEAR REPORT No, cooE TYPE No.

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u 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

t i j o l l The cause was believed to be wear of a contact point in the mechanical linkage which l m l operates the switch. Switch movement is less than 1/64 inch between open and closed. l l After minor adjustement of internal "zero" screw, the switch operated. The pressure l

,, ,3, g switch was then adjusted and repeatability was verified. DIS 1500-9 will continue to l

,, ,,, 4 be performed. No further action deemed necessary.  ;

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NAME OF PREPARER PHONE:

DEVIATION REPORT

- Commonwealth Edison DVR No- 12 - 2 -

82 - 19 STA UNIT YEAR NO.

PART 1 l TITLE OF DEvlATION OCCURRED LPCI Loop Break Detection Switch Failure 4/3/82 1100 OATF T!Yr SYSTEM AFFECTED PLANT STATUS AT TIME OF EVENT TESTING LPCI uoog Run , , ,, , ,,7 3 2370 , LOAD <uaE) 770 0 0 DESCRIPTION OF EVENT g , g rcnge of differential pressure input. Adjusted "zero" screw and dPIS 2-261-34B operated.

Adjusted switch to trip at 26.5" of water (dp) increasing. Repeatability found to b2 0.K.

10 CFR50.72 NRC RED PHONE NOTIFICATION MADE YES NO EOUlPMENT F A ILURE OVES Q No w0ax RE0utsr No. RESPONslBtf SUPERVISOR Alan R. Zapotocky DATE 4/3/82 PART 2 l 0PERATING ENGINEER'S COPMENTS The other three switches, 2-261-34 A, C, & D, were in calibration and operated properly. 2-261-34B was immediately readjusted and then operated properly.

O EVENT OF PU BL I C I N TE RE ST O 2A. HOUR NRC NOTiriCATiON REO.D TECH. SPEC. VIOLATION TELEPH N/A REGION til DATE TIME O NON REPORTABLE OCCURRENCE N/A 14 DAY RE PORT ABLE / T. S. REGION lli DATE TIME C 30 DAY REP OR TA BL E / T. .

Ceco CORPORATE NOTIFICATION MADE O ANNuALeSPECt REPORT REO.D ir AB0vE N0ririCAriON iS PER iOCrR2i A.I.R. e_, $. DAY WRITTEN REPORT RE0'D PER 10CFR21 L.E.R. ,82-11/03L-0 F. A. Palmer 4/5/82 1534 TELEPH CECO CORPORATE OFFICER DATE TIME PRELlulNARY REPORT COMPLETED AND REVIE*ED John M. Almer 4-5-82 OPERAliNG ENGINEER / DATE INVESTIGATED REPORT 8 RESOLUTION '

ACCEPTED BY STATION REVIEn g

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RESOLUTION APPROVED AND AUTHOR IZED FOR DISTRI BUTION ,

[/2/82-

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