ML19345D700

LER 80-052/03L-0:on 801118,reactor Triple Low Water Level Indicator Switches RE-18A & RE-18D Tripped at Manometer Readings Higher than Tech Spec Limit.Caused by Sensor Repeatability.Switches Reset

ML19345D700
Person / Time
Site:	Oyster Creek
Issue date:	12/08/1980
From:	Fitzgerald M JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345D692	List: ML19345D691 ML19345D700
References
LER-80-052-03L, LER-80-52-3L, NUDOCS 8012160491
Download: ML19345D700 (1)

Text

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NRC FC.M 368 U. S. NUCLE A74 EEEULATE.Y COMMISS!cN .

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, . LICENSEE EVENT REPORT CC.\ TOOL 8LCCK: l I

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(PLEASE 7CINT OR TYPE ALL CEQUIRED INFO {MATIONI l ~ lar l eal sl Ni Ji 0 l C l P l 1 lgls0 l 0 l- l 0 l0 l0. Nuussa l0 l0 l-- l0 l0 lgl4jll1gll1lgl 25 a ucaNss Tvea ao l J g-er ar u ucunsa ccoe i.  : uceNse l

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switches, b6th RE-18A and RE-18D tripped at manometer readings higher .

,,, 3

,, ,, , , than the limit of <126.0"H 02 as given in the Tech. Spec. , Table 3.1.1, ,

The "As Found" values for each were Re-18A-129.5"H20, RE-18B-

,,,,,. Item G.2. ,

125.8"H 0, RE '.8C-126.0"H 0 and RE-180-130.0"H2 0. The safety signifi- ,

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,,;.; ; cance was considered minimal due to only a temporcry loss of system ,

,,,,, , redundancy.

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44 47 CAUSE oESCRIPTICN AND CORRECTIVE ACTIONS

,, ,,,; The cause of the occurrence was at ibuted to sensor repeatability. The ,

,,,,, , switches were reset to trip within the Tech. Spec, limit of between There will be a future study of the reactor ,

,, ,,, , 121.0"H 02 and 123.0"H20.

,, ,,, g triple low level set point to determine if it can be changed to account ,

, , y for instrument drift. ,

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