ML19340D838

LER 80-032/03L-0:on 801202,low Pressure Switch Ps 2-2-134C Setpoint Found Lower than Tech Spec Limits.Caused by Setpoint Drift of Barksdale Model B2T-A12SS Pressure Switch. Switch Recalibr,Tested & Returned to Svc

ML19340D838
Person / Time
Site:	Peach Bottom
Issue date:	12/22/1980
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-80-032-03L, LER-80-32-3L, NUDOCS 8101050442
Download: ML19340D838 (1)

Text

, n. .. n., , wr wu. 2-80-32/3L w or anspcGtion b inforscment, Region I v.). Nac icdr R egu latory Conyni ssion ,,

631 Park Avenue p Aing of Prussia, PA 19406 '

Dear Mr. Grier:

6 nis L.E.R. concerns setpoint drift of a main steam line low pressure switiih. #-

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j L W asa ble Technical Spesification is Table 3.2.A. Q p h

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f VENT DESCntPTION AND PRodAswE CONSEQUENCES h g lWhile at power, Surveillance Testing on main stema line low pressure i y ; switch, PS 2-2-134C, revealed that the setpoint was lower than the Tech l

, 7 i spec Table 3.2.A limit of greater than or equal to 850 peig by 0.69 [

] ipercent. This is one of four switches which provide 2 of 4 logic for  ;

- q j MSIV isolation in run mode in the event of low main steam pressure, g

{ -]-] l Previous LER's: 2-80-28/3L,2-76 *78/3L,3-78-01/3L.  ;

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p e, CAuhE LESCHiPTION AND CORRECTIVE ACT10Ns 2r

,r-~l l Instrumentation error was caused by setpoint drif t of the Barksdale l

[ !il lModel B2T-A12SS Pressure switch. The instrument was immediately i Iiiei l recalibrated to within Tech. Spec. limits, satisfactorily tested, and  ;

l g -- g;-) l returned to service. g l 1 ic l 1 1 a ,

s t'A spoWtR .T**ERETATUS Det o a DebcOVERY DE5cR6PT608e t t . I [,EJ@ bl 0l Ol@l NA l [,B_j@ Surveillance Test j

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