ML20041B391

LER 82-004/03L-0:on 820115,drywell High Pressure Switch Ps 4315B Tripped out-of-spec.Caused by Instrument Drift. Switch Recalibr

ML20041B391
Person / Time
Site:	Duane Arnold
Issue date:	02/12/1982
From:	Varner D IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20041B382	List: ML20041B381 ML20041B391
References
LER-82-004-03L, LER-82-4-3L, NUDOCS 8202230598
Download: ML20041B391 (1)

Text

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EVENT DESCRIPTION ANO PMCSAGLE CONSEQUENCES Q DTTTI I During normal operation while performing surveillance testing, drywell h I g g r1 l igh pressure switch, PS 4315B, tripped out-of-specification at 2.2 psig. I r5 m l Technical Specification Table 3.1-1 requires the setpoint to be </= 2.0 l io # si i psig. The instrument tolerance is +/- 0.06 psig. On high drywell pressu 1 io is i l re, this switch initiates reactor trip, primary containment isolation, a 1 1 o ! 7 l 1 nd standby qas treatment system. Redundant switches were operatinq prone I ic ia l I rl y. There has been one previous similar occurrence (see A0 74-29) 1

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CAUSE DESCRIPT1CN AND CCARECTIVE ACTtCNS 27 ii!o l l Instrument drift. PS 4315B is a Static-0-Rinq pressure switch. Model 12N I is t i i 1 -AA4. PS 4315B was promntly recalibrated and tested satisfactorilv. No f I ii ,2i 1 urther corrective action is planned. I liiali I 11 1 11  !

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