05000317/LER-1980-067-03, /03L-0:on 801221,reactor Protective Sys Channel B Trip Units for High Power,Thermal Margin/Low Pressure & Axial Flux Offset Were Bypassed to Repair Cold Input.Temp Element 1-TE-122CB Failed.Elements Replaced W/Calibr Spaces

/03L-0:on 801221,reactor Protective Sys Channel B Trip Units for High Power,Thermal Margin/Low Pressure & Axial Flux Offset Were Bypassed to Repair Cold Input.Temp Element 1-TE-122CB Failed.Elements Replaced W/Calibr Spaces

ML20002D943
Person / Time
Site:	Calvert Cliffs
Issue date:	01/20/1981
From:	Lagiewski J, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20002D942	List: 05000317/LER-1980-067, Forwards LER 80-067/03L-0 05000317/LER-1980-067-03, /03L-0:on 801221,reactor Protective Sys Channel B Trip Units for High Power,Thermal Margin/Low Pressure & Axial Flux Offset Were Bypassed to Repair Cold Input.Temp Element 1-TE-122CB Failed.Elements Replaced W/Calibr Spaces
References
LER-80-067-03L, LER-80-67-3L, NUDOCS 8101230526
Download: ML20002D943 (1)

LER-1980-067, /03L-0:on 801221,reactor Protective Sys Channel B Trip Units for High Power,Thermal Margin/Low Pressure & Axial Flux Offset Were Bypassed to Repair Cold Input.Temp Element 1-TE-122CB Failed.Elements Replaced W/Calibr Spaces

Event date:
Report date:
3171980067R03 - NRC Website

text

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U.S. NUCLEAR REGULATcRY COMMISSION 15CFORM366 (7 77h LICENSEE EVENT REPORT

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60 61 ooCKET NUMB ER 68 6G EVENT oATE 7<

75 REPORT o ATE 80.

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h t o 12 i l At 1615, durino nomal operation, Reactor Protective System Channel B

-[

trio units for high power, themal margin / low oressure (TM/LP) and axial l

i o 13 i i flux offset were bypassed to repair the Tcold input. Channel 8 trio I

ro ui l units were returned to service at 2015. All other trip units remained I

io isi i io is i l operable during this event. LERs 79-62 (U-1) and 77-39 (U-2) describe 1

loi7i i similar occurrences.

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CooE TYPE No.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 11 101 l Initially found temeerattire element 1-TE-122CB had failed: its naddino I

li li 1 l recister lead was ocen. The einment was re entiv installed durinn tha i

mI recent outace. It is concluded that the lead broke as a result of hand 1-I liia t I ino durino insta11ation. Also. found 1-TE-112CB with a hich resistance I

mI connection. Both tvoe 104ABH elements were reolaced with calibrated soares.

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_ NAMii OF PREPARER