05000315/LER-1985-068, :on 851213,unexpected Stream Line Isolation Occurred.Caused by Natural Sequence During Performance of Approved Surveillance Test Procedure & Technician Failure to Warn Operators of Event

:on 851213,unexpected Stream Line Isolation Occurred.Caused by Natural Sequence During Performance of Approved Surveillance Test Procedure & Technician Failure to Warn Operators of Event

ML20141F356
Person / Time
Site:	Cook
Issue date:	01/02/1986
From:	Lauren Gibson INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
Shared Package
ML20141F349	List: 05000315/LER-1985-043, :Corrective Actions & Preventive Measures Taken Re Discrepancies in Process Sensor Calibr Completed,Per Confirmatory Action Ltr Issued on 850820 05000315/LER-1985-068, :on 851213,unexpected Stream Line Isolation Occurred.Caused by Natural Sequence During Performance of Approved Surveillance Test Procedure & Technician Failure to Warn Operators of Event ML20141F344
References
LER-85-068, LER-85-68, NUDOCS 8601090256
Download: ML20141F356 (1)

LER-1985-068, on 851213,unexpected Stream Line Isolation Occurred.Caused by Natural Sequence During Performance of Approved Surveillance Test Procedure & Technician Failure to Warn Operators of Event

Event date:
Report date:
3151985068R00 - NRC Website

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NR Form 386 U S. NCLEQQ CEGULOTOQY i.OMMISSION g

I APPROVED OMB NO.3150 0104 LICENSEE EVENT REPORT (LER)

EXPIRES 8 31 se F ACILITY NAME HD DOCKET NUMBER (28 PAGEi3.

TITLE ( Al lOFl011 D.

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NCME TELEPFONE Nvv8ER ARE A CODE L. S. GIBSCN, TECHNICAL ENGINEERING SUPERINTENDENT 61116 4 16151-15191011 COMPLETE ONE LIP 61 FOR EACH @%ENT F AILURE DESCRIBED IN THIS REPORT 1136

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ON DECEMBER 13, 1985, WITH UNIT 1 IN MODE 3 (HOT STANDBY), A STEAMLINE ISOLATIC',i OCCURRED WHICH IS AN ACTUATION OF THE ENGINEERED SAFETY FEATURES (ESF) SYSTEM.

THE EVENT WAS THE RESULT OF A NATURAL SEQUENCE DURING THE PERFORMANCE OF AN APPRO7ED SURVEILLANCE TEST PROCEDURE.

THE PROCEDURE INCLUDED A GRECAUTION THAT A STEAM LINE ISOLATION COULD OCCUR, HOWEVER,,7THE TECHNICIAN DID NOT INFORM THL CONTROL ROOM PERSONNEL OF THIS POSSIBILITY.

CONSEQUENTLY, WHILE AN ACKNOWLEDGED RESULT OF THE EVOLUTION IN PROGRESS,THE EVENT WAS UNEXTECTED BY THE OPERATORS, MAKING IT REPORTABLE.

OPERATIONS AND TECHNICAL PbRSONNEL TOOK IMMEDIATE CORRECTIVE ACTION TO RESTORE THE UNIT TO PRE-EVENT STATUS.

THERE WERE NO ADVERSE CONSEO.UENCES FROM THE EVENT.

s AS PREVENTIVE' ACTION, THE PROCEDURE WAS CHANGED TO REQUIRE AN OPERATOR SIGN-OFF ACKNOWLEDGING AWARENESS OF THE POSSIBLE ESF ACTUATION.

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