05000321/LER-1981-042-03, /03L-0:on 810505,reactor Bldg Vent Radiation Monitor Was Found to Alarm at 10,000 Counts/Minute.Caused by Setpoint Drift.Instrument Recalibr

/03L-0:on 810505,reactor Bldg Vent Radiation Monitor Was Found to Alarm at 10,000 Counts/Minute.Caused by Setpoint Drift.Instrument Recalibr

ML20004B414
Person / Time
Site:	Hatch
Issue date:	05/21/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004B412	List: 05000321/LER-1981-042, Forwards LER 81-042/03L-0 05000321/LER-1981-042-03, /03L-0:on 810505,reactor Bldg Vent Radiation Monitor Was Found to Alarm at 10,000 Counts/Minute.Caused by Setpoint Drift.Instrument Recalibr
References
LER-81-042-03L, LER-81-42-3L, NUDOCS 8105280204
Download: ML20004B414 (2)

LER-1981-042, /03L-0:on 810505,reactor Bldg Vent Radiation Monitor Was Found to Alarm at 10,000 Counts/Minute.Caused by Setpoint Drift.Instrument Recalibr

Event date:
Report date:
3211981042R03 - NRC Website

text

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' EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h gl While the plant was in a refueling and torus modification outage,1011-3 l K619A, Reactor Building Vent Radiation Monitor, was found to alarm at t

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4 LER No.: 50-321/1981-042 Licensee: Georgia Power Company Facility: Edwin I. Hatch Docket flo. : 50-321

Narrative

Report for LER 50-321/1981-042 While the plant was in a refueling and torus modification outage,1011-K619A, Reactor Building Vent Radiation Monitor, was found to alarm at 10,000 counts per minute. The setpoint should have been 6948 cpm.

The redundant channel was found to be within tolerance.

There was no effect on public health and safety nor was safe plant operation affected.

This is a non-repetitive event.

The cause of this event has been attributed to setpoint drift. The instrument was re-calibrated and returned to service. The unit is now in full compliance with the requirements for Reactor Building Vent Radiation Monitoring.

A generic review of the event revealed no inherent problems.

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