ML20039D433

LER 81-047/03L-0:on 811204,high Drywell Pressure Switch PS-4311B Trip Setpoint Found to Be Out of Tolerance.Caused by Instrument Drift.Switch Recalibr (Static-O-Ring Model 12N-AA5)

ML20039D433
Person / Time
Site:	Duane Arnold
Issue date:	12/22/1981
From:	Varner D IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20039D428	List: ML20039D427 ML20039D433
References
LER-81-047-03L, LER-81-47-3L, NUDOCS 8201040086
Download: ML20039D433 (1)

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REPORT oaf t to EVEseT oEscmipT!CN ANo a8tCOA8LE CONSECUENCES O'o tot 2lI During normal operation while performing surveillance testing, high dryw g g i ell pressure switch PS-4311B trip setpoint was found to be out of tolera  ;

,o,,,i nce. PS-4311B initiates HPCI, RHR, and core spray systems on high drywel l

,o,3, i i pressure. The trip setpoitt is 2.0 psig +/- 0.12 psig. The as found tr  ;

gl ip setpoint was 2.2 psia. Redundant high drywell pressure initiation sio l lo i7! ] nals were operable. Sec Tech. Spec. 3.5. A, 3.5.0, and Table 3.2-B. No pr l t o ,a i i evious similar occurrences to this instrument or redundant instruments. I

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