ML18078A577

LER 78-077/03L-0 on 781128:pressurizer Level Read 10% Higher than Other Channels.Calibr of Sensor Showed Tech Spec Limit for Low Level Trip Was Exceeded by 2% Due to Failure of Strain Gauge in Pressurizer Level Sensor

ML18078A577
Person / Time
Site:	Salem
Issue date:	12/26/1978
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18078A575	List: ML18078A574 ML18078A577
References
LER-78-077-03L, LER-78-77-3L, NUDOCS 7901020128
Download: ML18078A577 (1)

Text

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!During Mode 3 operation while performing channel checks, the Control Operator noticed I)))) !pressurizer level reading 10% higher than other channe.ls. Performance Department was l))I] jnotified and Action Statements for T/S 3.3.2.1 and 3.3.l.l were implemented. Cali-

[§))J !bration of sensor showed T/S limit for low level trip was exceeded by 2%. After the

[)))).!channel was returned t.o service and the unit was taken to Mode 1, the channel was agaiil{

l]JI} !found to be reading hiqh. The sensor was repaired and recalibrated and returned to

~ [§))] !service on 12-2-78. This is the third occurrence of this type (76-22 and 77-43). I 7 8 9 80 SYSTEM CAUSE CAUSE COMP. VAL.VE cooE cooe su8cooE COMPONENT cooE suBcooE suBcooE C§Jil 7 8 I

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o::I:§J (The strain gauge in the sensor transmitter developed a hiqh resistance in the output o::::oJ lbridcre which resulted in a 120 millivolt zero shift in the transmitter output. The r:::IJ]J !strain gauge was replaced and the transmitter was recalibrated.

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