05000317/LER-1979-041-03, /03L-0:on 790907,noted That Steam Generator Pressure Indicator Deviated Greater than 22 Psia from Three Redundant Channels.Caused by Dirty Lugs/Connection at Loop Indicator.Resistor Lugs Cleaned

/03L-0:on 790907,noted That Steam Generator Pressure Indicator Deviated Greater than 22 Psia from Three Redundant Channels.Caused by Dirty Lugs/Connection at Loop Indicator.Resistor Lugs Cleaned

ML19209C017
Person / Time
Site:	Calvert Cliffs
Issue date:	10/08/1979
From:	Davis S, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19209C011	List: 05000317/LER-1979-041, Forwards LER 79-041/03L-0 05000317/LER-1979-041-03, /03L-0:on 790907,noted That Steam Generator Pressure Indicator Deviated Greater than 22 Psia from Three Redundant Channels.Caused by Dirty Lugs/Connection at Loop Indicator.Resistor Lugs Cleaned
References
LER-79-041-03L, LER-79-41-3L, NUDOCS 7910110401
Download: ML19209C017 (1)

LER-1979-041, /03L-0:on 790907,noted That Steam Generator Pressure Indicator Deviated Greater than 22 Psia from Three Redundant Channels.Caused by Dirty Lugs/Connection at Loop Indicator.Resistor Lugs Cleaned

Event date:
Report date:
3171979041R03 - NRC Website

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, LICENSEE EVENT REPORT CCNTROL BLOCK: l l

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l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

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7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE J0 Si CAT 58 CON'T Lj@l0l5 0l010l3l117l@l0l910l7l7l9l@]l1010l81719 @

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60 61 DOCKET NUMBER 68 69 EVENT OATE

'4 75 REPORT OATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h l At 1715 while oerforming a surveillance check the operator discovered that #12 O

2 i steam aenerator pressure indicator 1-PI-1023C had deviated creater than 22 osia 0

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4 i from the three redundant channels. Steam Generator (SG) cressure low reactor i

l orotection trip unit Channel C was bypassed in accordance with T.S.3.3.1.1.

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s SG pressure low trio unit was returned to service at 1005 on 9-7-79.

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] redundant channels remained operable during the event. This is not a repetitive 1

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l 018 occurrence.

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9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REV6SION

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CODE TYPE NO.

@,;LER ROl217 l9 l l _._ l 0l 4j 1l y

l0l3l l Ll l-l ^ l eg 22 23 24 26 27 28 29 30 31 32 ON PL ANT E

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44 47 33 37 40 CAUSE OESCRIP'!ON AND CORRECTIVE ACTIONS h IIndicator 1 DI-1023C was indicatino hich level due en dirtv lunc:/connectinn at I

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l its 1000 resistor. The resulting increased resistance caused the indicator to I

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i receive an elevated voltage signal. Resistor luas were cleaned out and the j

2 l indication returned to normal.

Existing PM procram includes ceriodic cleanino i

3 1 of resistors develocine trio function voltaces.

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% POWER OTHER STATUS is O RY DISCOVERY OESCRIPTION l E l@ l ll 0l 0l@l NA l

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ACTIVITY CO TENT RELE ASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE l Z l @ l Zl@l NA I

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