ML20040F483

LER 81-070/03L-0:on 811231,isolation Condenser Isolation Pipe Break Sensor IB11A1 Tripped Above Tech Spec Limit. Caused by Instrument Repeatability.Setpoint Lowered.Switches Will Be Replaced During Future Refueling Outage

ML20040F483
Person / Time
Site:	Oyster Creek
Issue date:	01/28/1982
From:	Hager C GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20040F480	List: ML20040F479 ML20040F483
References
LER-81-070-03L, LER-81-70-3L, NUDOCS 8202090254
Download: ML20040F483 (1)

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LICENSEE EVENT REPORT l

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4 60 61 COCKET hyugga EVEN f DESCRIPTION AND PROSABLE CONSEQUENCES h

@ l During surveillance testing the Isolation Condonsor isolatinn ninn hvoW l

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sensor 1B11$1 ms found to trip at a value greater than the Technical  !

, ; ,, ; ; Specification limit of 27 inches of water Delta P. The "As Found" trip l

, , . , , ; point was 28.5. The safety significance of the occurrence is minimized l by the redundancy of the systcn. . t

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44 CAUSE DESCRIPTICN AND CORRECTIVE ACTIONS

,jo j Instrument repeatability was the cause of failure. It was decided to  ;

lower the setpcint to 24 inches of water Delta P which should eluninate  ;

"As Ebund" trip points above the Technical Specification limit of 27. ,

These switches will be replaced during a future refueling outage with 13l l l an improved design. ,

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PERSONNEL EXPOSURES g NUM8ER TYPE DESCRIPTION '

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