05000318/LER-1980-046-03, /03L-0:on 801024,containment Pressure Signal to Reactor Protection Sys Channel a Found Out of Calibr in Nonconservative Direction.Caused by Output of Transmation Isolator 2-E/E-5313A Being 0.2 Vdc Low Over Range

/03L-0:on 801024,containment Pressure Signal to Reactor Protection Sys Channel a Found Out of Calibr in Nonconservative Direction.Caused by Output of Transmation Isolator 2-E/E-5313A Being 0.2 Vdc Low Over Range

ML19345B445
Person / Time
Site:	Calvert Cliffs
Issue date:	11/24/1980
From:	Davis S, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345B438	List: 05000318/LER-1980-046, Forwards LER 80-046/03L-0 05000318/LER-1980-046-03, /03L-0:on 801024,containment Pressure Signal to Reactor Protection Sys Channel a Found Out of Calibr in Nonconservative Direction.Caused by Output of Transmation Isolator 2-E/E-5313A Being 0.2 Vdc Low Over Range
References
LER-80-046-03L-01, LER-80-46-3L-1, NUDOCS 8012010336
Download: ML19345B445 (1)

LER-1980-046, /03L-0:on 801024,containment Pressure Signal to Reactor Protection Sys Channel a Found Out of Calibr in Nonconservative Direction.Caused by Output of Transmation Isolator 2-E/E-5313A Being 0.2 Vdc Low Over Range

Event date:
Report date:
3181980046R03 - NRC Website

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6 60 61 coCKET NUM5ER 68 69 EVENT oATE 74 75 REPORT OATE 80 EVENT oESCRIPTIOPJ AND PROBABLE CONSEQUENCES h 10121 l At 1055, during t.5e performance of a routine test it was discovered that i

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the containment (CTMT) pressure signal to Reactor Protection System i

1o 4l l (RPS) Channel A was out of calibration in the non-conservative direction.

I lo loi I RPS Channel A CTMT press trip unit was placed out of service per T.S.

I Io is i I 3.3.1.1.

The CTMT oressure channel was returned to service at 1430.

l l o 171 l The three redundant channels remained ooerable during the event. LER's I

io#8i l 80-13 (U-1) and 80-44 (U-2) describe similar events.

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33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h Iiioil The outout of Transmation Isolator (Model Nn. '130-IT) 2-E/F-5313A wat I

ii si j l 0.2 VDC low over its rance. The isolator could not be successfully I

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calibrated.

It was reolaced with a soare and returned to the manu-1 ii i3i l facturer for repair. Facility Change Request 80-25, reoorted in LER l

ii iAi l 80-13 (U-2), should imorove the isolators' reliability.

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