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: Difference between revisions

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{{Adams
#REDIRECT [[05000317/LER-1981-032, Forwards LER 81-032/03L-0]]
| number = ML20027C822
| issue date = 05/20/1981
| title = /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
| author name = Lagiewski J, Rizzo G
| author affiliation = BALTIMORE GAS & ELECTRIC CO.
| addressee name =
| addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
| docket = 05000317
| license number =
| contact person =
| document report number = LER-81-032-03L-01, LER-81-32-3L-1, NUDOCS 8210270269
| package number = ML20027C818
| document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| page count = 1
}}
{{LER
| Title = /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
| Plant =
| Reporting criterion =
| Power level =
| Mode =
| Docket = 05000317
| LER year = 1981
| LER number = 32
| LER revision = 3
| Event date =
| Report date =
| ENS =
| abstract =
}}
 
=text=
{{#Wiki_filter:.
E*~
LICENSEE EVENT REPORT
~
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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).
The tecterature I
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.
I l i 131 1 It was installed as a TMI-related r.odificatien, so that onlv one year's l
mI historv is available. Therefore, no nreventive action is olanned.
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}}
 
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Revision as of 21:24, 20 December 2024