05000317/LER-1981-032-03, /03L-0:on 810420,reactor Protective Sys Channel D Highpower Thermal Margin/Low Pressure & Axial Shape Index Trip Units Bypassed.Caused by Need to Replace Transmitter 1-TT-112D Which Drifted High

/03L-0:on 810420,reactor Protective Sys Channel D Highpower Thermal Margin/Low Pressure & Axial Shape Index Trip Units Bypassed.Caused by Need to Replace Transmitter 1-TT-112D Which Drifted High

ML20027C822
Person / Time
Site:	Calvert Cliffs
Issue date:	05/20/1981
From:	Lagiewski J, Rizzo G BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20027C818	List:
References
LER-81-032-03L-01, LER-81-32-3L-1, NUDOCS 8210270269
Download: ML20027C822 (1)

LER-1981-032, /03L-0:on 810420,reactor Protective Sys Channel D Highpower Thermal Margin/Low Pressure & Axial Shape Index Trip Units Bypassed.Caused by Need to Replace Transmitter 1-TT-112D Which Drifted High

Event date:
Report date:
3171981032R03 - NRC Website

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?S Pt' ORT oATE 80 EVENT oESCRIPTioN AND PROBABLE CONSEQUENCES h F6 IT1 l At 0Q00, during nomal oceration, Reactor Protective System (RPS) Channel j

"D" HiPower Thermal Margin / Low Pressure, and Axial Shace Index trip units ib TT1 l i o I. t I -

were byoassed for maintenance on Tcold (T.S. 3.3.1.1).

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transmitter was replaced and all trip units returned to service at 0940.

i r6 TTl I o e l The three redundant channels remained operable during this event. This

@l is the first reported failure of this type of instru lent.

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o CAUSE oESCRIPTION AND CORRECTIVE ACTIONS h L' Lo.1 1 Transmitter 1-TT-112CD (RIS AX5C-1372-809508) outeut sicnal drifted hich I

EI causino Channel "D" RPS Tcold inout to be about 1.5 decrees hich. The I

mI transmitter, reolaced by a scare, will be sent to its Mfr. for reoair.

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mI historv is available. Therefore, no nreventive action is olanned.

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