05000311/LER-1980-011-03, /03L-0:on 800710,during Routine surveillance,2C Vital Bus Undervoltage Trip Relay Failed to Meet Spec.Caused by Variation in Ambient Conditions Resulting in Relay Trip Setpoint Changing from Preset Mode.Relay Reset

/03L-0:on 800710,during Routine surveillance,2C Vital Bus Undervoltage Trip Relay Failed to Meet Spec.Caused by Variation in Ambient Conditions Resulting in Relay Trip Setpoint Changing from Preset Mode.Relay Reset

ML18082A869
Person / Time
Site:	Salem
Issue date:	08/08/1980
From:	Murphy M Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18082A868	List: 05000311/LER-1980-011, Forwards LER 80-011/03L-0 05000311/LER-1980-011-03, /03L-0:on 800710,during Routine surveillance,2C Vital Bus Undervoltage Trip Relay Failed to Meet Spec.Caused by Variation in Ambient Conditions Resulting in Relay Trip Setpoint Changing from Preset Mode.Relay Reset
References
LER-80-011-03L-01, LER-80-11-3L-1, NUDOCS 8008130505
Download: ML18082A869 (1)

LER-1980-011, /03L-0:on 800710,during Routine surveillance,2C Vital Bus Undervoltage Trip Relay Failed to Meet Spec.Caused by Variation in Ambient Conditions Resulting in Relay Trip Setpoint Changing from Preset Mode.Relay Reset

Event date:
Report date:
3111980011R03 - NRC Website

text

NRC FORM 366 17-77).

U.S. NUCLEAR REGULATORY COMMISSION e LICENSEE EVENT REPORT CONTROL BLOCK: !o-1 __..____.__..____._ __......_-<!I G).

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[)))) I During a routine surveillance procedure, it was determined that the 2C Vital Bus

[)))) I Undervoltage Trip Relay was out of specification.

Action Statement 3.3.2.la was ITITI I entered at 1115 hcurs (DoCke:t 50-272: 7B-36).

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44 47 IJ:J:]j I A drastic change in ambient conditions resulted in the relay trip setpoint changing from the preset condition.

The relay was reset under existing conditions and tested satisfactorily.

The Action Statement was terminated at 1410 hours0.0163 days <br />0.392 hours <br />0.00233 weeks <br />5.36505e-4 months <br />.

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