05000316/LER-1985-031-01, :on 851027,ESF Actuated as Result of Lower Containment Airborne Monitor Particulate Channel Train a High Alarm.Caused by Monitors Trending Upward.Setpoints Readjusted

:on 851027,ESF Actuated as Result of Lower Containment Airborne Monitor Particulate Channel Train a High Alarm.Caused by Monitors Trending Upward.Setpoints Readjusted

ML20137E696
Person / Time
Site:	Cook
Issue date:	11/21/1985
From:	Kriesel T INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
Shared Package
ML20137E676	List: 05000316/LER-1985-031-01, :on 851027,ESF Actuated as Result of Lower Containment Airborne Monitor Particulate Channel Train a High Alarm.Caused by Monitors Trending Upward.Setpoints Readjusted 05000316/LER-1985-032-01, :on 851022,upper Containment Area Radiation Monitor Failed,Resulting in ESF Actuation Signal.Caused by Failure of Two Internal Electronic Modules.Failed Modules Replaced & Monitor Declared Operable 05000316/LER-1985-033-01, :on 851023,lower Containment Airborne Monitor high-range Noble Gas Channel Gave Spurious High Alarm Signal Resulting in ESF Actuation Signal.Caused by Software Errors. Errors Being Evaluated by Mfg 05000316/LER-1985-034-01, :on 851024 & 30,high Alarms Received on Lower Containment Airborne Particulate Radiation Monitor Train B, Resulting in ESF Actuation Signal.Caused by Monitor Trending Upward.Setpoints Readjusted ML20137E669
References
LER-85-031-01, LER-85-31-1, NUDOCS 8511270295
Download: ML20137E696 (1)

LER-1985-031, on 851027,ESF Actuated as Result of Lower Containment Airborne Monitor Particulate Channel Train a High Alarm.Caused by Monitors Trending Upward.Setpoints Readjusted

Event date:
Report date:
3161985031R01 - NRC Website

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NRO Form 366 U.S. NUCLEA3 EEIULATOAV COMMISSION APPROVED OMS NO.31110-4104 g

E m :ES s,oise LICENSEE EVENT REPORT (LER)

FACILaTV NAME (1)

DOCKE1 MBER (2)

PAGE13p DONALD C. COOK NUCLEAR PLANT UNIT 2 0 i5 ] 0 l 0 l 0131116 1 lOFl011 TITLE (4)

ESF ACTUATION EVENT DATE (5)

LER NUMSER (6)

REPORT DATE &

OTHER F ACILITIES INVOLVED (S)

MONTH DAY YEAR YEAR

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y,Q MONTH OAY DEAR F ACIUTY NAMES DOCKET NUM8ER(Sp 015101010 I I i 1l0 2l 7 85 8l5 0l3l1 0l 0 1l 1 2l1 8l5 oisiogoio, i i THIS REPORT IS SUOMITTED PURSUANT TO THE REQUMEMENTS OF 10 CFR l: Ich.c* ene or more e, rh.,o#ewegl (11)

OPERATING EE l

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LICENSEE CONTACT POR THl3 LIR 412)

T. A. KRIESEL - TECHNICAL PHYSICAL SCIENCES

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ON OCTOBER 27, 1985 AT 1910' HOURS WITH THE REACTOR COOLANT SYSTEM IN MODE 1 (OPERATING) AT 29 PERCENT REACTOR THERMAL POWER, ERS-2301 THE LOWER CONTAINMENT AIRBORNE MONITOR PARTICULATE CHANNEL TRAIN A (IEEE/ MON) HIGH ALARMED.

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

DURING THE TIME OF THE EVENT THE MONITORS HAD BEEN TRENDING UPWARD.

RADIATION PROTECTION WAS AWARE OF THE INCREASING TREND AND WERE IN THE PROCESS OF CALCULATING A NEW HIGH ALARM SETPOINT BUT WAS NOT ABLE TO GET THE NEW SETPOINT CALCULATED IN TIME TO PREVENT THE HIGH ALARM.

THE MONITORS WERE FUNCTIONING AS DESiJNED BY TRENDING THE INCREASING RADIATION LEVELS 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 CONTAINMENT.

THE HEALTH AND SAFETY OF THE PUBLIC WERE NOT AFFECTED.

8511270295 851121 N

PDR ADOCK 05000316

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