ML19338F086

LER 80-022/03L-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

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: ML19338F077 ML19338F086
References
LER-80-022-03L-02, LER-80-22-3L-2, NUDOCS 8010070509
Download: ML19338F086 (1)

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7 8 OOCK ET NUMggR EVENT D ATE EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h 10 l 2 l l While performing HPCI Turbine Area High Te,riperature Calibration Surveillance Ql5 l gl 27-l, temperature switch TS 1-2371A was found to trip above 2120 F. Technical l gl Specification 3.2.1. specifies the trip setpoint to be less than 2000F. The 1 m i redundant switches would have initiated a HPCl isolation had the need arisen. l gl Therefore, the consequences of this occurrence are minimal. l 10171 l __I 10181I 80 l

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u 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h li loi l The failure of TS 1-2371A was instrument setpoint drift. The temoerature switch I 8'l was replaced and tested satisfactorily on September 5. 1980. I 8 I t 7 l mI I uLi]I 1 7 8 P . 80 5A $  % POWER OTHER STATUS 01 RY OISCOVERY OESCRIPTION Surveillance Testing li is ] lH l@ 10 l 0 l0 l@ln NA u

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l. 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.

Vll. 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.

Vill, 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.