05000325/LER-1980-063-03, /03L-0:on 800826,during Testing of Reactor Flow Bias,Three Average Power Range Monitors Were Actuating Out of Spec.Caused by Instrument Drift.Monitors Recalibr & Returned to Svc

/03L-0:on 800826,during Testing of Reactor Flow Bias,Three Average Power Range Monitors Were Actuating Out of Spec.Caused by Instrument Drift.Monitors Recalibr & Returned to Svc

ML19338D784
Person / Time
Site:	Brunswick
Issue date:	09/16/1980
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19338D749	List: 05000325/LER-1980-063, Forwards LER 80-063/03L-0 05000325/LER-1980-063-03, /03L-0:on 800826,during Testing of Reactor Flow Bias,Three Average Power Range Monitors Were Actuating Out of Spec.Caused by Instrument Drift.Monitors Recalibr & Returned to Svc
References
LER-80-063-03L, LER-80-63-3L, NUDOCS 8009230745
Download: ML19338D784 (1)

LER-1980-063, /03L-0:on 800826,during Testing of Reactor Flow Bias,Three Average Power Range Monitors Were Actuating Out of Spec.Caused by Instrument Drift.Monitors Recalibr & Returned to Svc

Event date:
Report date:
3251980063R03 - NRC Website

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LICENSEE EVENT REPORT

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6 80 St CoCKET NyvagR 60 69 EvtNT OATg 74 76 REPORT DATE 80 LVENT DESCRIPTION AND PROBABLE CONSEQUENCES h gl During the perforrance of tesr.ing reactor flow bias, P.T.l.l.7 PC, three APRM's, l

gl ciodel no.145C309AAG001, were founc' actuating out of specification. APRM "A" upscale l o, l alarm / rod block actuated at 110% while the reportable limit is greater than 108%.

l gl AP?li "C" downscale alarci actuated at. 2.95% while the reportable limit is less than l

g {. APRM "F" upscale alarm / rod block indication came in at 109% while the reportable l g[

ftisgreaterthan108%. This event did not affect the health or safety of the l

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JJ Jo JS 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h g All three APRM's actuated out of requirements due to instrument drif t.

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APRM's were calibrated a's per the P.T. and returned to service.

In addition, APRM's l B, D, and E were checked at the same time and found within required specifications.

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, 3 l As these instruments are checked weekly and no failures have occurred in the past l

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