ML19209C017

LER 79-041/03L-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

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: ML19209C010 ML19209C017
References
LER-79-041-03L, LER-79-41-3L, NUDOCS 7910110401
Download: ML19209C017 (1)

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, LICENSEE EVENT REPORT CCNTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 o i l M l D l C l C l N l 1 l@j 0 l 0 l - l 0 l0 l0 l 0 l0 l- 10 l025 l@l4 14 15 LICENSE NUMBER 26 l1LICENSE 11 11TYPE (1J0l@lSi CAT l 58 l@

7 8 9 LICENSEE CODE CON'T fo 1 8

"E 0 3o , Lj@l0l5 0l010l3l117l@l0l910l7l7l9l@]l1010l81719 @ 68 69 EVENT OATE '4 75 REPORT OATE 80 7 60 61 DOCKET NUMBER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h O 2 l At 1715 while oerforming a surveillance check the operator discovered that #12 0 3 i steam aenerator pressure indicator 1-PI-1023C had deviated creater than 22 osia i

o 4 i from the three redundant channels. Steam Generator (SG) cressure low reactor O s l orotection trip unit Channel C was bypassed in accordance with T.S.3.3.1.1. I O s SG pressure low trio unit was returned to service at 1005 on 9-7-79. The three l O 7 ] redundant channels remained operable during the event. This is not a repetitive 1 018 occurrence. l 80 7 8 9 OE CODE SUBC E COMPONENT CODE S ec OE S E 7

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_ EVENT YEAR REPORT N3. CODE TYPE NO.

@ ,;LER egRO l _._ l 0l 4j 1l y l0l3l l Ll l- l^l l217 22l9 l 23 24 26 27 28 29 30 31 32 K N ON PL ANT E HOURS 22 58 i FOR 4 8. SL plt E MANUFACT RER AC lN l33X jgl34 lg l35 Zlg l36 Zjg 37 0l 0l 0l 40 l gg 41 l fllg 42 l3A jg 4

l A l 3 ] 8 l 2 [g 44 47 CAUSE OESCRIP'!ON AND CORRECTIVE ACTIONS h

1 O IIndicator 1 DI-1023C was indicatino hich level due en dirtv lunc:/connectinn at I i i l its 1000 resistor. The resulting increased resistance caused the indicator to I j

, 2 i receive an elevated voltage signal. Resistor luas were cleaned out and the i 3 l indication returned to normal. Existing PM procram includes ceriodic cleanino i 4 1 of resistors develocine trio function voltaces. l STA  % POWER OTHER STATUS is O RY DISCOVERY OESCRIPTION NA l i s l E l@ l ll 0l 0l@l l lBl@l Surveillance Test ACTIVITY CO TENT RELE ASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 6 NA I l NA l .

1 l Z l @ l Zl@l PERSONNEL EXPOS ES 3-NUVBER TYPE DESCRIPTICN 1 7 l0l0l0l@lZl@l NA l

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NAME OF PREPARER