ML19345F620

LER 81-006/03L-0:on 810115,during Surveillance Testing, Reactor Triple Low Water Level Indicator Switch RE-18B Tripped at Monometer Reading Higher than Allowed by Tech Spec Table 3.1.1.Caused by Instrument Drift.Switch Reset

ML19345F620
Person / Time
Site:	Oyster Creek
Issue date:	02/09/1981
From:	Crosby P JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345F619	List: ML19345F618 ML19345F620
References
LER-81-006-03L, LER-81-6-3L, NUDOCS 8102180619
Download: ML19345F620 (1)

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EVEN r DESCRIPTION AND PROSABLE CCNSEQUENCES h I o I:' l During surveillance testinc* the reactor triple low water level indicator i I O 6 a i ! switch PE-18B tripped at a manameter reading higher than the limit of f

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[olai l 126.0"I10 7 as given in the Technical Specifications, Table 3.1.1, its j g i s i ; G.2. The trip point value was 129.0"II 0.7 The safety significance is I ic ie 1 I considered minimal since the redundant trip systm would have  !

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li;Ol [ The cause of the occurrence was instrument drift. The switch was reset _

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[ ;i ; [ to trip within the Technical Specification limit of 121.0"II,0 to 123.0" I Iii2I I 2 II 0. Possible setpoint changes to account for instrument repeatability l 1 i l 21 l are currently being studied. l

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