ML20041B238

LER 82-003/03L-0:on 820113,while Performing Surveillance Testing,Reactor Vessel Pressure Switch Ps 4529 Tripped Below Tech Spec Limit.Caused by Instrument Drift.Switch Recalibr

ML20041B238
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
ML20041B236	List: ML20041B235 ML20041B238
References
LER-82-003-03L, LER-82-3-3L, NUDOCS 8202230418
Download: ML20041B238 (1)

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!a lai i During normal operation while performing surveillance testino, reactor v i m i essel pressure switch, PS 4529, tripped out-of-specification at 438 psio I t o i. i i . Technical Specification Table 3.2-B requires the setpoint to be 456.7 I io i s i i +/- 15 psig(including a +6.7 psig head correction and a +/- 15 osio inst I lo is I l . tolerance). On low reactor pressure. this switch oprmits the nnoninn n I l o 171 I f core spray and RHR discharne valves. Redundant switches were nneratinn I l o is i i properly. There has been one orevious similar occurrence (see A0 75-03) . I 7 es a E CE su C E COMPCNENT CCOG sus E Su cbs loisl IC IF l@ y@ l E l@ lI lN I S I T ! R j ul@ I Sl@ W@

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i i i o i l Instrument drift. PS 4529 is a Barksdale pressure switch. Model B2T-MI2S I li s i i i S. PS 4529 was promptly recalibrated and tasted satisfactorily. No furth 1 Iii2i 1 er corrective action is olanned. I liis t i I Iitai I  !

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