05000315/LER-1985-020, :on 850429,low Pressure CO2 Fire Suppression Sys for Quadrant 1 of Reactor Cable Tunnel Isolated W/O Fire Watch Coverage.Caused by Personnel Error.Personnel Counseled

:on 850429,low Pressure CO2 Fire Suppression Sys for Quadrant 1 of Reactor Cable Tunnel Isolated W/O Fire Watch Coverage.Caused by Personnel Error.Personnel Counseled

ML20129E683
Person / Time
Site:	Cook
Issue date:	05/24/1985
From:	Blind A INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
Shared Package
ML20129E666	List: 05000315/LER-1985-020, :on 850429,low Pressure CO2 Fire Suppression Sys for Quadrant 1 of Reactor Cable Tunnel Isolated W/O Fire Watch Coverage.Caused by Personnel Error.Personnel Counseled 05000315/LER-1985-021, :on 850429,reactor Vessel Flow Requirement Not Verified Prior to RCS Boron Dilution.Procedure for Filling Reactor Refueling Cavity Revised to Include Verification/ Documentation of Reactor Vessel Flow During RCS Dilution
References
LER-85-020, LER-85-20, NUDOCS 8506060562
Download: ML20129E683 (3)

LER-1985-020, on 850429,low Pressure CO2 Fire Suppression Sys for Quadrant 1 of Reactor Cable Tunnel Isolated W/O Fire Watch Coverage.Caused by Personnel Error.Personnel Counseled

Event date:
Report date:
3151985020R00 - NRC Website

text

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AppAOyED OMO NO 2150-o10 LICENSEE EVENT REPORT (LER) 8ACILITY NAME Hi DOCKET NUMSER 121 FAGE 43)

D. C. COOK, UNIT ONE o [s i o I o I o f 31 115 1 lOFl011 TITLEI.#

INADVERTENT ISOLATION OF LOW PRESSURE CARBON DIOXIDE SYSTEM EVENT DATE ill LER NuMSER ts#

R EPORT DATE (71 OTHER FACILIT,ES INVOLVED lei MONTw OAY vtAR vtAm

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ON APRIL 29, 1985, AT 0825 HOURS, WITH THE REACTOR COOLANT SYSTEM IN MODE 6 (REFUELING), THE LOW PRESSURE CARBON DIOXIDE FIRE SUPPRESSION SYSTEM (IEEE/KQ) FOR QUADRANT ONE OF THE REACTOR CABLE TUNNEL, WAS ISOLATED WITH-OUT FIRE WATCH COVERAGE AS REQUIRED BY TECHNICAL SPECIFICATION 3.7.9.3.

TiiE SYSTEM WAS RETURNED TO NORMAL AT 1120 HOURS, APRIL 29, 1985 AFTER IT WAS DISCOVERED TO HAVE BEEN INADVERTENTLY ISOLATED.

THE INCIDENT OCCURRED DUE TO PERSONNEL ERROR.

IT WAS THE RESULT OF; 1)

UNFAMILIARITY WITH THE LOW PRESSURE CARBON DI0 AIDE FIRE SUPPRESSION SYSTEM ISOLATION POINTS, AND 2) INADEQUATE COMMUNICATIONS BETWEEN CRAFT PERSONNEL REQUESTING THE ISOLATION AND SECURITY PERSONNEL WHO CARRIED OUT THE RE-QUEST.

WHILE THE FIRE PROTECTION SYSTEM WAS ISOLATED FOR APPROXIMATELY THREE IIOURS, TIIE FIRE DETECTION SYSTEM REMAINED OPERABLE.

CONSEQUENTLY, IT IS CONCLUDED THAT THERE WAS NO SUBSTANTIAL DEGRADATION OF FIRE PROTECTION CAPABILITY DUE TO THIS EVENT, NOR DID IT CONSTITUTE A HAZARD TO THE HEALTH AND SAFETY OF THE PUBLIC.

THOSE INDIVIDUALS INVOLVED ARE NOW AWARE OF CORRECT ISOLATION POINTS FOR AREAS WITHIN THE REACTOR CABLE TUNNEL AND HAVE BEEN COUNSELLED ON THE

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IMPORTANCE OF PROPER CONTROL OF THE LOW PRESSURE CARBON DIOXIDE FIRE SUPPRESSION SYSTEM.

7 PREVIOUS OCCURENCES OF A SIMILAR NATURE INCLUDE: 50-316/84-009 AND 50-316/84-027.

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