ML20004D702

LER 81-030/03L-0:on 810422,during Normal Operation,Two Pressure Transmitters Were Discovered Indicating Low Pressure.Caused by Instrument Drift.Pressure Transmitters Were Calibr

ML20004D702
Person / Time
Site:	Fort Saint Vrain
Issue date:	05/22/1981
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20004D697	List: ML20004D696 ML20004D702
References
LER-81-030-03L, LER-81-30-3L, NUDOCS 8106090663
Download: ML20004D702 (1)

Text

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EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h I o l 21 l During nor::al operation, instrument parsonnel performed the primarv coolant pressure i l o t a l Iscram calibration check and found two pressure transmitters were indicating low pres- l 10141 Isure and could have caused the primary coolant high pressure switches to trip above l lo#sl [ the limits of LCO 4. 4.1, Table 4.4-1. This is being reported por Fort St. Vrain Tech-l o is l Inical Specification AC 7.5.2(b)1 and AC 7.5.2(b)2. No affect on public health or l 1o17l lsafety. Similar occurrences RO 77-46, 70-57, and 81-008. l l o is i i 60 7 8 9 SYSTEM CAUST CAUSE COMP. VALVE COCE CCCE SL'1C006 CCMPONENT CODE SU8CCDE SUSCODE lo19l lI I B l@ lE lh (_gj@ l I I N I S l T l R I U lh Wh W h 18 19 20 7 8 9 10 ti 12 13 SEQUENTIAL OCCUR R ENCE REPORT REVISION LE R/Ro EVENT YEAR R EPORT No. CCOE TYPE No.

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41 l N lh l4 N lh lu Gl 0l 6 I 31@ 47 JJ J4 JS 42 CAUSE CESCRIPTtON AND CCARECTIVE ACTIONS h 1T171 lThe low pressure signals were due to ins trument drif t of the pressure transmitter. l li1il iThe pressure transmitters were calibrated. Once a month, on a temCorary bt.ais ther I i,,7i j pressure transmitter voltage outputs will be checked against reactor pressure to J g i etermine d if further instrument drift is occurring. This will continue until the nexrl iiiAi ] calibration, or it is determined no c~alibration drift is occurring, i 7 g 9 30 ST 'b POWER OTHER STATUS 31 Y CISCOVERY QESCRIPTION li It I djh l0 l5 l0 l@l N/A a l l45B l@lasScheduled Surveillance Test l

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