05000254/LER-1980-014-03, /03L-0: on 800415,while Performing High Drywell Pressure Calibr & Functional Test,Procedure QIS-6,pressure Switch PS-1-1001-88A Was Found to Trip Above Allowable Limits.Caused by Instrument Setpoint Drift.Switch Recalibr

/03L-0: on 800415,while Performing High Drywell Pressure Calibr & Functional Test,Procedure QIS-6,pressure Switch PS-1-1001-88A Was Found to Trip Above Allowable Limits.Caused by Instrument Setpoint Drift.Switch Recalibr

ML19316A749
Person / Time
Site:	Quad Cities
Issue date:	05/14/1980
From:	Eagle J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19316A748	List: 05000254/LER-1980-014, Forwards LER 80-014/03L-0 05000254/LER-1980-014-03, /03L-0: on 800415,while Performing High Drywell Pressure Calibr & Functional Test,Procedure QIS-6,pressure Switch PS-1-1001-88A Was Found to Trip Above Allowable Limits.Caused by Instrument Setpoint Drift.Switch Recalibr
References
LER-80-014-03L-02, LER-80-14-3L-2, NUDOCS 8005270445
Download: ML19316A749 (2)

LER-1980-014, /03L-0: on 800415,while Performing High Drywell Pressure Calibr & Functional Test,Procedure QIS-6,pressure Switch PS-1-1001-88A Was Found to Trip Above Allowable Limits.Caused by Instrument Setpoint Drift.Switch Recalibr

Event date:
Report date:
2541980014R03 - NRC Website

text

I NRC For.M 344 U.S. NUCLEAR REGULATCRY COMMisSloN (7 77)

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8 80 St DOCKET NUMBER 68 63 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCh, h l While performing the High Drywell Pressure Calibration and Functional Test, precedure g O 2

QlS-6, pressure switch PS-1-1001-88A was found to trip at 2.05 psig. This was higher g

a g ; than the 2.0 psig LCO setpoint defined in Technical Specification Table 3.1-1.

The remaining three pressure switches in the one-out-of-two-twice logic scheme were io,3, g l within their required setpoints and would have provided a reactor scram if high O 6 g l drywell pressure had occurred.

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the swi tch was functionally tested satisfactorily.

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NAME OF oREoAnsa

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LER NUMBER:

LER/RO-14/03L-0 ll.

LICENSEE NAME:

Commonwealth Edison Company Quad-Cities Nuclear Power Station I l l.'

FACILITY NAME:

Unit One IV.

DOCKET NUMBER:

050-254 V.

EVENT DESCRIPTION

On April 15, 1980, while performing the High Drywell Pressure Calibration and Functional Test, procedure QlS-6, pressure swi tch PS-1-1001-88A was found to trip at 2.05 psig. This was higher than the 2.0 psig.

limiting condition for operation setpoint defined in Technical Speci fication Table 3 1-1.

Unit One was in the RUN mode at 768 MWe and 2328 MWt.

VI.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The failure of this pressure switch did not effect plant safety.

Instrument PS-1-1001-88A is an A channel sensor in conjunction with PS-1-1001-88C in a one-out-of-two-twice logic scheme. The setpoint of pressure switch PS-1-1001-88C and both B channel pressure switches (PS-1-1001-88B and PS-1-1001-880) were found to be within their requi red setpoints. The 88C pressure swi tch in combination wi th either one of B channel pressure switches would have provided a reactor scram if high drywell pressure had occurred.

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CAUSE

The cause of this occurrence was instrument setpoint drif t.

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CORRECTIVE ACTION

The immediate corrective action was to calibrate the pressure switch to 1 95 psig. at which time the switch was functionally tested sa t i s factori ly.