05000318/LER-1980-006-03, /03L-0:on 800126,during Steady State Operation, Reactor Protective Sys Channel a High Power,Low Flow,Axial Flux Offset & Thermal Margin/Low Pressure Trip Units Bypassed for Corrective Maint.Meter Input Jacks Cleaned

/03L-0:on 800126,during Steady State Operation, Reactor Protective Sys Channel a High Power,Low Flow,Axial Flux Offset & Thermal Margin/Low Pressure Trip Units Bypassed for Corrective Maint.Meter Input Jacks Cleaned

ML19296D134
Person / Time
Site:	Calvert Cliffs
Issue date:	02/22/1980
From:	Lagiewski J, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19296D132	List: 05000318/LER-1980-006, Forwards LER 80-006/03L-0 05000318/LER-1980-006-03, /03L-0:on 800126,during Steady State Operation, Reactor Protective Sys Channel a High Power,Low Flow,Axial Flux Offset & Thermal Margin/Low Pressure Trip Units Bypassed for Corrective Maint.Meter Input Jacks Cleaned
References
LER-80-006-03L-01, LER-80-6-3L-1, NUDOCS 8002290385
Download: ML19296D134 (2)

LER-1980-006, /03L-0:on 800126,during Steady State Operation, Reactor Protective Sys Channel a High Power,Low Flow,Axial Flux Offset & Thermal Margin/Low Pressure Trip Units Bypassed for Corrective Maint.Meter Input Jacks Cleaned

Event date:
Report date:
3181980006R03 - NRC Website

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LICENSEE EVENT REPORT CCNTRol B LOCK: l l

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8 60 61 DOCKET % YBER 68 69 EVENT DATE 74 75 REPCRT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSECUENCES h 1 Durino steady state operation at 1055, Reactor Protective System Channel 1

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l A hiah power low flow, axial flux offset and therr.al margin / low pressure 1

I trip units were bypassed for corrective maintenance per T. S. 3.3.1.

The l

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i redundant channels remained operable throughout this event.

Channel A l

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I high power, low flow, axial flux offset and TM/LP trip units were o

r, 10171 I returned.o service at 1520. This is not a repetitive occurrence.

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9 10 11 12 13 18 18 20 SE QUENTI A L OCCURAENCE REPORT REVISION LE A RO EVENTYEAR R EPORT NO.

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33 34 35 36 37 40 el 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l The trip units were bypassed to allow work to proceed on the channel l

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l test panel and trip test cable after plant operators noted erratic i

i li i 21 I meter readinas on the test panel meter while takino readinos. The li 131 l meter input iacks were found dirtv and loose oins were found on the I

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l trip test cc.ble connector.

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% POWE R OTHER STATUS 011 0 RY DISCOVERY DESCRIPTION LEJ@ l 110 i O l@l nA l

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50-318 EVEfiT DATE 01/26/80 REPORT DATE 02/22/80 ATTACHMEtlT CAUSE DESCRIPTI0tl Af1D CORRECTIVE ACTI0ftS:

(C0flTIfiUED)

The meter input jacks were cleaned and the connector pins were tightened, after which, meter indications were stable.

The meter input jacks and trip test connector are used by Control Technicians at least monthly in performance of surveillance tests.

The trip test connector is used by plant operators each shift to take log readings. Because they are used frequently, it is deemed unnecessary to take further preventive action.