ML19345E933

LER 81-003/03L-0:on 810114,pressure Switch PS-1-1001-90D Tripped High.Caused by Instrument Setpoint Drift.Switch Recalibr

ML19345E933
Person / Time
Site:	Quad Cities
Issue date:	01/21/1981
From:	Wunderlich J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19345E929	List: ML19345E928 ML19345E933
References
LER-81-003-03L, LER-81-3-3L, NUDOCS 8102060443
Download: ML19345E933 (1)

Text

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LICENSEE EVENT REPORT

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(PLEASE PRINT C?l TYPE ALL REQUIRED INFORMATION) io lil8 l 9ll LI LICENSEE 7

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REPCHT OATE 7 4 61 EVENT DESCRIPTION AND PROBABLE CONSECUENCES h

igj While performing the High Drywell Pressure ECCS Initiation Calibration and I g o ,3 ; j Fi*nctional Test, procedure QlS-7, pressure switch PS-1-1001-90D was found to trip at l i O i ., j l 2.03 psig. This was higher than the 2.0 psig LCO setpoint defined in Technical l g , 9

-) ; Specification Table 3.2-2. The remaining pressure switches in the one-out-of-two- j twice logic scheme were within their required setpoints and would have provided an  !

ECCS initiation had the need arisen, t

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h lil0ll The cause of this occurrence was instrument setpoint drif t. Pressure switch PS l l lil l 1001-900 was immediately recalibrated and functionally tested satisfactorily. I l

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