05000317/LER-1981-009-03, /03L-0:on 810205,reactor Protector Sys Channel D Trip Units Bypassed.Caused by Increase in Temp Detector Resistance,Probably Due to Increased Connection Resistance in Containment.Input Removed from Channel D

/03L-0:on 810205,reactor Protector Sys Channel D Trip Units Bypassed.Caused by Increase in Temp Detector Resistance,Probably Due to Increased Connection Resistance in Containment.Input Removed from Channel D

ML19347D222
Person / Time
Site:	Calvert Cliffs
Issue date:	03/05/1981
From:	Lagiewski J, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19347D219	List: 05000317/LER-1981-009, Forwards LER 81-009/03L-0 05000317/LER-1981-009-03, /03L-0:on 810205,reactor Protector Sys Channel D Trip Units Bypassed.Caused by Increase in Temp Detector Resistance,Probably Due to Increased Connection Resistance in Containment.Input Removed from Channel D
References
LER-81-009-03L, LER-81-9-3L, NUDOCS 8103110487
Download: ML19347D222 (1)

LER-1981-009, /03L-0:on 810205,reactor Protector Sys Channel D Trip Units Bypassed.Caused by Increase in Temp Detector Resistance,Probably Due to Increased Connection Resistance in Containment.Input Removed from Channel D

Event date:
Report date:
3171981009R03 - NRC Website

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6J 61 COCi(ET NL 1BER 68 t,9 EVENT O ATE 74 75 p!* ORT OATE 83 EVENT DESCF.lPTION AND PROS ABLE CONSEQUENCES h 10121 l At 0800, while investicatina a hich Tcold inout, Reactor Protector Sys-I lo !3! l tem Channel 0 Hi Power, Hi Start-uo Rate, Low Steam Generator Pressure, I

lo !al l Themal Margin / Low Pressure, and Axial Flux Offset trio units were by-l l o 151 I cassed (T.S. 3.3.1.1).

The oroblem was corrected and all Channel 0 I

lo is l l trio units were returned to service at 0930. The three redundant chan-I l o ! 71 1 nels remained ocerable during this event.

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t i l 31 i RPS and Tc signal level returned to nomal value.

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