05000334/LER-1979-026-03, /03L-0:on 790827,channel 3 Overpower Delta Temp Alarm Was Received.Caused by Miscalibr of Instrument Loop as Result of Not Having Current Resistance Temp Detector Calibr Data in Surveillance Test.Maint Procedures Will Be Rev

/03L-0:on 790827,channel 3 Overpower Delta Temp Alarm Was Received.Caused by Miscalibr of Instrument Loop as Result of Not Having Current Resistance Temp Detector Calibr Data in Surveillance Test.Maint Procedures Will Be Revised

ML19209A306
Person / Time
Site:	Beaver Valley
Issue date:	09/27/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19209A301	List: 05000334/LER-1979-026, Forwards LER 79-026/03L-0 05000334/LER-1979-026-03, /03L-0:on 790827,channel 3 Overpower Delta Temp Alarm Was Received.Caused by Miscalibr of Instrument Loop as Result of Not Having Current Resistance Temp Detector Calibr Data in Surveillance Test.Maint Procedures Will Be Rev
References
LER-79-026-03L, LER-79-26-3L, NUDOCS 7910030496
Download: ML19209A306 (1)

LER-1979-026, /03L-0:on 790827,channel 3 Overpower Delta Temp Alarm Was Received.Caused by Miscalibr of Instrument Loop as Result of Not Having Current Resistance Temp Detector Calibr Data in Surveillance Test.Maint Procedures Will Be Revised

Event date:
Report date:
3341979026R03 - NRC Website

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LICENSEE EVENT REPORT -

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8 60 61 DOCKET NUMBER 6F 63 EVENT DATE 74 7b REPORT DATE 80 EVENT DESCRIPT'ON AND PRODABLE CONSEQUENCES h 2 lDuring a load increase, at 99 percent power, the Channel 3 Overpower Delta Temperature 1

3 l alarm was received.

At 1830 hours0.0212 days <br />0.508 hours <br />0.00303 weeks <br />6.96315e-4 months <br />, the loop bistables were tripped.

The loop was 1

[ calibrated and returned to service at 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br /> on 8/29/79.

The health and safety of l

4 7 lthe general public were not jeopardized as redundant instrument loops were available l

l6 I land the loop was protectiny in the conservat'ive direction.

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CAUSE COMP.

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33 J4 35 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS IlT)lThe instrument loop was miscalibrated as a result of not having the current RTD

] l Calibration data in the surveillance test.

The hot leg RTD was replaced during a l

l previous outage and new calibration data was obtained.

However, the new data was not l

7 y l included in the loop calibration procedure.

Maintenance procedures will be revised to l l insure revisions are placed in controlled procedure file.

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8 9 80 STATYS

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20 6 9 11 12 LOSS OF OR DAMAGE TO F ACILITY j

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