05000318/LER-1981-039-03, /03L-0:on 810810,reactor Protection Sys Channel D Trip Points for Hi Power,Thermal Margin/Low Pressure & Axial Shape Index Bypassed to Troubleshoot Erratic Tc Indications.Possibly Caused by Detector or Loose Connection

/03L-0:on 810810,reactor Protection Sys Channel D Trip Points for Hi Power,Thermal Margin/Low Pressure & Axial Shape Index Bypassed to Troubleshoot Erratic Tc Indications.Possibly Caused by Detector or Loose Connection

ML20010G702
Person / Time
Site:	Calvert Cliffs
Issue date:	09/09/1981
From:	Lagiewski J, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20010G699	List: 05000318/LER-1981-039, Forwards LER 81-039/03L-0 05000318/LER-1981-039-03, /03L-0:on 810810,reactor Protection Sys Channel D Trip Points for Hi Power,Thermal Margin/Low Pressure & Axial Shape Index Bypassed to Troubleshoot Erratic Tc Indications.Possibly Caused by Detector or Loose Connection
References
LER-81-039-03L, LER-81-39-3L, NUDOCS 8109220428
Download: ML20010G702 (1)

LER-1981-039, /03L-0:on 810810,reactor Protection Sys Channel D Trip Points for Hi Power,Thermal Margin/Low Pressure & Axial Shape Index Bypassed to Troubleshoot Erratic Tc Indications.Possibly Caused by Detector or Loose Connection

Event date:
Report date:
3181981039R03 - NRC Website

text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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8 60 61 COCKET NuveER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h Io i2I l At 1250, durinn normal operation. Reactor Protection (vstem Channel "D"

l l o 13 l l Trip Units for Hi Power, Thermal Margin / Low Pressure at d Axial Shape l

I o 1. l l Index were bypassed to troubleshoot erratic Tc indications (T.S. 3.3.1.

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1). The RTD was jumpered due to r3spected loose connections and all l

l iO le l I trip units were returned to servi c at 1420. The three redundant I

l o 17 I l channels remained operable during this event. LER 50-317/81-16 and LER l

l 0 l8 l l 79-31 describe similar events.

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