05000254/LER-1980-022-03, /03L-0:on 800903,during Calibr Surveillance,Temp Switch TS 1-2371A Tripped at 212 F Rather than 200 F.Caused by Setpoint Drift.Switch Replaced

/03L-0:on 800903,during Calibr Surveillance,Temp Switch TS 1-2371A Tripped at 212 F Rather than 200 F.Caused by Setpoint Drift.Switch Replaced

ML19338F086
Person / Time
Site:	Quad Cities
Issue date:	09/22/1980
From:	Steffes C COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19338F078	List: 05000254/LER-1980-022, Forwards LER 80-022/03L-0 05000254/LER-1980-022-03, /03L-0:on 800903,during Calibr Surveillance,Temp Switch TS 1-2371A Tripped at 212 F Rather than 200 F.Caused by Setpoint Drift.Switch Replaced
References
LER-80-022-03L-02, LER-80-22-3L-2, NUDOCS 8010070509
Download: ML19338F086 (1)

LER-1980-022, /03L-0:on 800903,during Calibr Surveillance,Temp Switch TS 1-2371A Tripped at 212 F Rather than 200 F.Caused by Setpoint Drift.Switch Replaced

Event date:
Report date:
2541980022R03 - NRC Website

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60 41 OOCK ET NUMggR 64 69 EVENT D ATE 74 76 REPOR T O ATE 80 EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h 10 l 2 l l While performing HPCI Turbine Area High Te,riperature Calibration Surveillance Ql5 l

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LER NUMBER:

LER/R0 80-22/03L 11.

LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station 111.

FACILITY NAME: Unit One IV.

DOCKET NUMBER: 050-254 V.

EVENT DESCRIPTION

On September 3, 1980, at 2 p.m., Refueling Outage Test QlS 27-l, HPCI Turbine Area High Temperature Switch Calibration was performed. Temperature Switch TS 1-2371A was found to trip above 2120F. Technical Specification 3.2.1.

specifies the trip point to be less than 2000F. This Instrument had drif ted 30F over the Technical Sr-ilfication limit on the previous test on August 13, 1979, and had been reau;usted successfully.

VI.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The 16 HPCI turbine area high temperature switches are arranged in groups of four switches per monitoring channel connected in a one-out-of-two-twice logic.

Therefore, the other switches would have initiated isolation at or below 2000F as designed.

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CAUSE

The cause of this occurrence was instrument setpoint drif t of temperature switch TS 1-2371A. The switch is manufactured by United Electric Controls Company, Model F7-88.

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CORRECTIVE ACTION

The switch was replaced with a new one by the instrument Maintenance Department and tested satisfactorily in accordance with QlS 27-1 on September 5, 1980.