05000293/LER-1983-002-01, /01T-0:on 830116,flow Ref off-normal Alarm Received.Average Power Range Monitor Flux Scram Trip Settings Affected.Cause Under Investigation.Flow Inputs Monitored & Amplifier B Recalibr

/01T-0:on 830116,flow Ref off-normal Alarm Received.Average Power Range Monitor Flux Scram Trip Settings Affected.Cause Under Investigation.Flow Inputs Monitored & Amplifier B Recalibr

ML20028G159
Person / Time
Site:	Pilgrim
Issue date:	01/28/1983
From:	Whitney G BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20028G157	List: 05000293/LER-1983-002, Forwards LER 83-002/01T-0 05000293/LER-1983-002-01, /01T-0:on 830116,flow Ref off-normal Alarm Received.Average Power Range Monitor Flux Scram Trip Settings Affected.Cause Under Investigation.Flow Inputs Monitored & Amplifier B Recalibr
References
LER-83-002-01T, LER-83-2-1T, NUDOCS 8302070467
Download: ML20028G159 (1)

LER-1983-002, /01T-0:on 830116,flow Ref off-normal Alarm Received.Average Power Range Monitor Flux Scram Trip Settings Affected.Cause Under Investigation.Flow Inputs Monitored & Amplifier B Recalibr

Event date:
Report date:
2931983002R01 - NRC Website

text

U. S. NUCLEAR REGULATORY COMMISSION lyRC EOR,M 386 (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 1 o l a l l On 1/16/83, while increasing power, a flow reference off-normal alarm was received. l 4

lo lal l It was determined that both A&B proportional amplifiers had drifted in a non-l l o 141 l conservative direction. The APRM flux scram trip settings were therefore l

l o I s l I af fected and T.S. section 2.1. A.1.a requirements were not met.

"A" channel was l

1o is l l found at 104 percent flow and "B" channel was at 91 percent flow, with an actual i

10171 l core flow of 81%. No cha11ence to the APRM scram settinns occurred durine this i

1ot8l l event: therefore. nublic health was not threatened.

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c ml will be continued daily during steady state condition as well as prior to and I

iii2l l during planned power maneuvers.

"B" amplifier was calibrated successfully.

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lil3l l amplifier output was found to be non-linear, but was reset 3 percent conservative i

l i 141 I wi thin T.S.

limits. The amplifiers are CEMAC tYne 563-02.

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% POWER OTHER STATUS DlS O RY DISCOVERY DESCRIPTION l1 15 l W@ l 0l 8l 1'@l NA l

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7 8 9 11 12 80 LOSS OF OR OAMAGE TO FACILITY TYPE

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