05000315/LER-1985-055, :on 851025,lower Containment Airborne Monitor Particulate Channel Train a High Alarmed,Resulting in ESF Actuation Signal.High Alarm & Alert Alarm Setpoint Readjusted

:on 851025,lower Containment Airborne Monitor Particulate Channel Train a High Alarmed,Resulting in ESF Actuation Signal.High Alarm & Alert Alarm Setpoint Readjusted

ML20137E713
Person / Time
Site:	Cook
Issue date:	11/21/1985
From:	Kriesel T INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
Shared Package
ML20137E660	List: 05000315/LER-1984-036, :on 840717,personnel Access Hatch Remained Open for 1 H & 20 Minutes.Caused by Personnel Negligence. Personnel Made Aware of Tech Spec 3.6.5.5 & Hatch Labeled W/Info Re Tech Spec Requirements 05000315/LER-1985-055, :on 851025,lower Containment Airborne Monitor Particulate Channel Train a High Alarmed,Resulting in ESF Actuation Signal.High Alarm & Alert Alarm Setpoint Readjusted 05000315/LER-1985-056, :on 850530,defective Fire Seal Discovered in Control Room Cable Vault Ceiling.Cause Undetermined. Continuous Fire Watch Coverage Established & Seal Repaired & Declared Operable ML20137E655
References
LER-85-055, LER-85-55, NUDOCS 8511270298
Download: ML20137E713 (1)

LER-1985-055, on 851025,lower Containment Airborne Monitor Particulate Channel Train a High Alarmed,Resulting in ESF Actuation Signal.High Alarm & Alert Alarm Setpoint Readjusted

Event date:
Report date:
3151985055R00 - NRC Website

text

NRC Ferne 306 U.S. NUCLE A 4 6.E LULATOAV COMMISSION 1-43)

APPROVED OMS NO. 31to4104

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LICENSEE EVENT REPORT (LER)

FACILITY NAME (1)

DOCKET NUMSER (2)

PAGE43A DONALD C. COOK NUCLEAR PLANT UNIT 1 ol5l0lolol3l1l5 i lOFl 0 l 1 TITLE nel ESF ACTUATION EVENT DATE 151 LER NUMSER (6)

REPORT DATE (7)

OTHER F ACILITIES INVOLVED (Si MONTM DAY YEAR YEAR MONTM DAY YEAR P ACILITV N AMES DOCKET NUMSER($)

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N1.ME TELEPHONE NUMBER T. A. KRIESEL - TECHNICAL PHYSICAL SCIENCES AREACOct DEPARTMENT SUPERINTENDENT 61116 4I615l-15l910l1 CCMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRISED IN TH18 REPORT (13)

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ON OCTOBER 25, 1985 AT 1007 HOURS WITH THE REACTOR COOLANT SYSTEM IN MODE 4 (HOT SHUTDOWN), ERS-1301, THE LOWER CONTAINMENT AIRBORNE MONITOR PARTICULATE CHANNEL TRAIN A HIGH ALARMED (IEEE/ MON).

THE HIGH ALARM RESULTED IN 1 ESF ACTUATION SIGNAL WHICH WOULD HAVE RESULTED IN AN ISOLATION OF THa CONTAINMENT PURGE SYSTEM HAD THE CONTAINMENT PURGE SYSTEM BEEN IN SERVICE.

REACTOR PRESSURE AND TEMPERATURE WERE BEING INCREASED DURING THIS TIME FOR REACTOR MODE CHANGE FROM MODE 4 TO MODE 3 (HOT STANDBY) WHICH OCCURRED AT 1056 HOURS.

BOTH ERS-1301 AND ERS-1401 (LOWER CONTAINMENT AIRBORNE MONITOR PARTICULATE CHANNEL TRAIN B) WERE TRENDING UP AT THE TIME AS A RESULT OF TME HEATUP.

THE MONITORQ WERE FUNTJIONING AS DESIGNED BY TRENDING THE INCREASING RADIATION LLVELS IN CONTAINMENT AT THE TIME OF THE EVENT.

THE HIGH ALARM SETPOINT AND ALERT ALARM SETPOINT WERE READJUSTED TO MORE ADEQUATELY REFLECT THE BACKGROUND RADIATION LEVELS IN THE CON-TAINMENT.

THE HEALTH AND SAFETY OF THE PUBLIC WAS NOT AFFECTED.

PREVIOUS OCCUPRENCES OF A SIMILAR EVENT:

315/85-004; 315/84-012; 315/84-003; 316/84-010.

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