05000416/LER-1982-004

LER 82-004/03L-0:on 820616,prior to Initial Fuel Load,Area Radiation Monitoring Sys Failure Alarm Initiated.Probably Caused by Transient Which Allowed Meter to Fall in Downscale Range of Monitor.Sys Tested & Declared Operable

ML20055B052
Person / Time
Site:	Grand Gulf
Issue date:	07/15/1982
From:	Byrd R MISSISSIPPI POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20055B048	List: 05000416/LER-1982-004, Forwards LER 82-004/03L-0
References
LER-82-004-03L, LER-82-4-3L, NUDOCS 8207200299
Download: ML20055B052 (2)

LER-2082-004,

Event date:
Report date:
4162082004R00 - NRC Website

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EVEPe7 QESCRIPTION ANO PROSASLE CONSEQUENCES Q o lon 6/16/82, prior to initial ftiel load, an " Area Radiation Monitoring System ;

o l Failure Alarm" was initiated. The ARM system was thereby declared inoperableg o land a limiting condition for operation was entered pursuant to T.S.3.3.7.1. l r;; TTl IArea surveys with portable monitoring instrumentation was performed every ,

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. Supplementary Information to LER 82-004/03 L-0 Licensee: Mississippi Power & Light Company Facility: Grand Gulf Nuclear Station - Unit 1 Docket No.: 50-416 On June 16, 1982, an " Area Radiation Monitoring System Failure Alarm" was_ initiated. Upon suggestion by Health Physics personnel, the ARM system was declared inoperable and a limiting condition for operation was entered. Health Physics personnel began surveys with portable monitoring devices immediately and continued every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> until July.

2, 1982. After investigation, maintenance personnel found the following: one detector's check _ source was sticking and one detector's setpoint was low. No failure of a channel was found. Probable cause of the alarm is attributed to a transient which allowed the meter to fail

'in the downscale range of the monitor, initiating the failure alarm.

After completion of surveillance testing, the system was declared operable on July 3, 1982.

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