ML20052E476

LER 82-013/03L-0:on 820402,LPCI Differential Pressure Switch 2-261-35B Failed to Operate on Increasing Differential Pressure.Caused by Contact Point Wear in Mechanical Linkage. Pressure Switch Adjusted

ML20052E476
Person / Time
Site:	Dresden
Issue date:	04/27/1982
From:	Schroeder B COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20052E469	List: ML20052E468 ML20052E476
References
LER-82-013-03L-05, LER-82-13-3L-5, NUDOCS 8205110142
Download: ML20052E476 (2)

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. ' LICENSEE EVENT REPORT CONTnOL sLOCx:

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- (Pt. EASE PRINT O'l TYPE ALL REQUIRED INFORMATION) ,

l 0 l_ t8l9l I l LUCENSEE 7

l D l CCOE R l S l 142 l@l 15 0 l 0 l - l 0uCENSE l0l0 l 0 l 0 l - l 0 l 250 l@l NuusER 26 4 luCENSE 1 l1 l1 l1 l@l57 GAT TYPE JO l

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7 8 60 el DOCK ET NUM8ER 66 69 EVENT 0 ATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES O'o l o 12 l l While performing monthly surveillance DIS 1500-9, it was found that LPCI Differential ]

,g,3,  ; Pressure Switch 2-261-35B failed to operate on increasing differential pressure (T.S. l

,g,,,  ; 3.2.B) The safety implications were minimal because the remaining three switches were l all operative and would have performed as designed. There was no effect on public  ;

health or safety. No previous occurrences noted. ,

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. SEQUENTIAL OCCURRENCE REPORT REVISION EVENT YEAR R EPORT No. CODE TYPE N O.

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,_ 23 24 26 27 28 29 30 31 32 T N ACT ON O P T ME HOURS 3ei POR B. s P La MANUPA RE1

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40 41 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li10l l The cause was believed to be wear of a contact ooint in the mechanical linkare which I g l operates the switch. Switch movement is less than 1/64 inch between open and closed. I

,,,,, gAfter minor adjustment of internal "zero" screw, the switch operated. The pressure l

,, ,,,gswitch was then adjusted to 55 I 5 inch dp increasing and repeatability was verified. l

,, ,,,; DIS 1500-9 will continue to be performed. No further action deemed necessary. l 7 8 9 80

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l i i 8s9 l I Z l @D OF RELEASELZJ@11 7 10 l AMOUNTOF N/A 44 ACTIVITY l 46 N/A @ l l PERWONNEL EXPOSURES 50 NUMSER TYPE CESCRIPTION l1 l 7 l l 0 l 0 l 0 l@l Z l@l N/A l l PERSONNEL iN2u%Es NuM8ER j i j a l l 010 l 0 [@letsCRiPrioN@ N/A l

)7 8 9 11 12 80 LOSS TYPE OF OR oAMAGE TO PACluTY Q DESCRIPTION v i 1 l 9s l9l Z l@liO N/A l

7 9205110142 820427 80 issut oESCRiPTioN@ DR ADOCK 05000237 NRC USE ONLY

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B. A. Schroeder 815-942-2920, X-422 NAME OF PREPARER PHONE: S L 1

f DEVIATION REPORT

. Commonwealth Efson STA UNIT Y E AR n PART 1 l T I TL E o r C E .'I A T I CN CCCUEEEC LPCI Loop Select dPIS 2-261-35B Failure 4-2-82 1400

. mr -.vr SYSTEM AFFECTED 1500 PLANT STATUS AT TlVE CF EVENT TFSTING LPCI uant Run , ,3,q u,T, 2504 , to,3 ( y,, g 816 O DESCRIPTION OF EvfNT During DIS 1500-9 the Differential Pressure Indicator Switch 2-261-35B failed to operate on increasing differential pressure. Adjustment screw was rotated through the entire range with no switch closure. After minor adjustment of internal "zero" screw, switch operated. Switch was adjusted to 55 +- 5" dp increasing and repeatability verified.

10 CrR5C.T: NoC REe ogNo g NOTIFICATION MADE YES NO EQUIPMEFT FAILURE O,es O No ACm RtoursT No. or oCv i eu r so erut,som Alan R. Zapotocky nort 4/2/82 PART 2 l OPER A Ti NG ENGINEER' S COWENTS The other three LPCI loop select dPIS operated properly during surveillance testing.

O EvtNT Or PuBeiC iNTtREs1 2A soua NRC NoTiriCATiON REC.D O TECH. SPEC. VIOLATION TELEps N/A REGION lli DATE TIME

] NON REPORT ABLE OCCURRENCE T E LE CM / TE L E COPY O 'd oAv RtPoaTAetE'T. s. aEcios iii oATE TIME

@ 30 DAY REPORT ABLE/ T.h. 6. B. 2.a ANNU AL / SP E CL NEPORT REQ'D IF ABOVE NOTIFICATION IS PER 10CFR21 A.I.R.

• 5-DAY ARITTEN REPORT REQ'D PER 10CFR21 L.E.R. . 82-13/03L-0 gg F. A. Palmer 4/23/82 1620 CECO CORPORATE OFFICER DATE TIME PRELIMINARY REPOET CWPLE TED AND RE V IE nED John M. Almer 4/23/82 ud i, A l l NG ENutNEER C A If INVESTIGATED REPORT 8 RESOLUTION I iS ACCE P TED BY STATION RE V I E m ..s. s M A 4. v o -) . -> /

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