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

: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

ML20137E863
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-85-034-01, LER-85-34-1, NUDOCS 8511270320
Download: ML20137E863 (1)

LER-1985-034, 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

Event date:
Report date:
3161985034R01 - NRC Website

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p U.S. NUCLEL:4 LELULATOJ Y COMMISSION NRC Farm 304 (943)

APPROVED oms NO. 3150-4104

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LICENSEE EVENT REPORT (LER)

DOCKET NUMSER (2)

PAGE(3)

FACILITY NAME tu DONALD C. COOK NUCLEAR PLANT UNIT 2 o ls ; o lo l o l 3; 1l 6 ijopl0;1 TITLE (4)

ESF ACTUATION EVENT DATE (53 LER NUMSER (4)

REPORT DATE (7)

OTHER F ACILITIES INVOLVED 10)

MONTH DAY YEAR FEAR MONTH DAY YEAR F ACILITY N AMES DOCKET NUMBER ($)

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20.402(b) 20.406(s) 20.40slaH1Hil 50.3steH1b 80.73(ell 2Hvl 73.71(c)

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J55AJ 20.4086sH1Hiv) 50.73(eH2Het 50.731sH2HviMHB) 20.408tsH1Hvl 90.73(aH2Hitil 50.734sH2Hal LICENSEE CONTACT FOR TH18 LER (12)

T. A. KRIESEL - TECHNICAL PHYSICAL SCIENCES

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DEPARTMENT SUPERINTENDENT 4 6; S i 5,9;0;1 6; 1, 6 i

i COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRISED IN TNis REPORT 113)

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MONTH DAY YEAR sueur$310N YES (19 ven. comnwee EXPECTED SUGWisSION DA'i NO l

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A T&ACT (u-,.,.m

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ON OCTOBER 24, 1985 AT 2358 HOURS WITH THE REACTOR COOLANT SYSTEM IN MODE 1 (OPERATING) AT 29 PERCENT REACTOR THERMAL POWER AND AGAIN ON OCTOBER 30, 1985 at 0058 HOURS WITH THE REACTOR COOLANT SYSTEM IN MODE 3 (HOT STAND 3Y), A HIGH ALARM WAS RECEIVED ON ERS-2401, THE LOWER CONTAINMENT AIRBORNE PARTICULATE RADIATION MONITOR TRAIN B (IEEE/ MON).

THE HIGH ALARMS RESULTED IN AN ESF ACTUATION SIGNAL 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 MONITOR TRENDED UPWARD UNTIL THE HIGH ALARM SETPOINT WAS REACHED..

A TOUR OF THE ANNULUS AREA DID NOT REVEAL ANY LEAKS.

THE MONITOR WAS CHECKED AND FOUND TO BE OPERATING NORMALLY.

THE HIGH ALARM SETPOINT AND ALERT ALARM SETPOINT WERE READJUSTED TO MORE ADEQUATELY REFLECT THE BACKCROUND RADIATION LEVELS IN THE CONTAINMENT.

THE HEALTH AND SAFETY OF THE PUBLIC WERE NOT AFFECTED.

PREVIOUS OCCURRENCES OF A SIMILAR EVENT:

316/85-031.

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