ML19308A256

LER 78-051/03L-0 on 781227:during Routine Surveillance Test, Setpoint of Pressure Switch Found to Be Approx 10% in Excess of Tech Spec Limit.Caused by Sheared Lockdown Screw on Setpoint Adjust.Pressure Switch Recalibr & Returned to Svc

ML19308A256
Person / Time
Site:	Peach Bottom
Issue date:	01/18/1979
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-78-051-03L, LER-78-51-3L, NUDOCS 7901250169
Download: ML19308A256 (1)

Text

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lo 121 l While at_ power __, during a routine surveillance test the setpoint of a j

lo I3 I I Pressure _ switch Q S-2-2-3_-52D) was found to be approximately 10%_in ex _ _ _ . __

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[ o l .i l I ceus of the_ Tech Spec limit._This switch provides a permissive for _

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[o IsI l closure of the Recirc Pump Discharge Valves on Low Reactor Pressure l lo lc 1 [ during_ accident conditions. Consequences were minimn1 since redundant . _ _ _

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Io IiI [ instrum_entation was, operable. _

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liloiI Investigation revealed the setpoint shift was caused by a sheared lock- l Ii ii J l down screw on the setpoint adjustment. The_ pressure switch, Barton Model _

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, ,, L 288, was immediately recalibrated and returned to service using the re- _, l lil3; [ dundant lockdown screw. Normal lockdown screw repairs were made two days , l

[ i 1., l l later and switch was returned to service following satisfactory retest. I

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