05000315/LER-1979-032-03, /03L-0 on 790416:during Routine Channel Calibr, Bistable FB-510B Trip Point Was Nonconservative W/Respect to Tech Spec Limit.Caused by Excess Drift.Bistable Recalibr

/03L-0 on 790416:during Routine Channel Calibr, Bistable FB-510B Trip Point Was Nonconservative W/Respect to Tech Spec Limit.Caused by Excess Drift.Bistable Recalibr

ML17317B212
Person / Time
Site:	Cook
Issue date:	05/16/1979
From:	Beilman T INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317B209	List: 05000315/LER-1979-030-03, /03L-0 on 790417:while Performing Routine Surveillance Test on AB Diesel Generator,Load Conservation Circuitry Did Not Fully Function as Design.Cause Under Investigation 05000315/LER-1979-031-03, /03L-0 on 790419:during Routine Channel Calibr, Bistable Trip Value Discovered Nonconservative W/Respect to Tech Spec Limits.Caused by Excess Drift.Bistable Will Be Repaired 05000315/LER-1979-032-03, /03L-0 on 790416:during Routine Channel Calibr, Bistable FB-510B Trip Point Was Nonconservative W/Respect to Tech Spec Limit.Caused by Excess Drift.Bistable Recalibr ML17317B208
References
LER-79-032-03L, LER-79-32-3L, NUDOCS 7905220339
Download: ML17317B212 (2)

LER-1979-032, /03L-0 on 790416:during Routine Channel Calibr, Bistable FB-510B Trip Point Was Nonconservative W/Respect to Tech Spec Limit.Caused by Excess Drift.Bistable Recalibr

Event date:
Report date:
3151979032R03 - NRC Website

text

NRC FORM 366 U. S. NUCI.EAR REGULATORY COMMISSION (7-77)

LtCENSEEEEVENT REPORT CONTROL BLOCK:

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{PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION)

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LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T Eo I LI~

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES ~10 DURING A ROUTINE CHANNEL CALIBRATION OF STEAM AND FEED FLOW NISNATCH INSTRUNENTATION

'HE TRIP POINT OF BISTABLE FB-510 B

WAS FOUND TO BE NON-CONSERVATIVE WITH RESPECT TO THE LIHIT IMPOSED BY T.S.

TABLE 2.2-1 ITEM 14.

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THE CAUSE OF THE NON-CONSERVATIVE'TRIP POINT HAS BEEN ATTRIBUTED TO EXCESSIVE DRIFT.

THE BISTABLE WAS RECALIBRATED AND OPERATION WAS MONITORED WITH NO ADDITIONAL DRIFT NOTED TO DATE..

PREVIOUS MONTHS'HANNEL FUNCTIONAL TESTS WERE CONSULTED WHICH INDICATE NO RECENT HISTORY Of DRIFT PROBLEMS.

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