05000366/LER-1981-049-03, /03L-0:on 810602,hi Hi Setpoints for Reactor Bldg Vent Radiation Monitors Were Discovered High.Caused by Setpoint Drift.Setpoint Changed

/03L-0:on 810602,hi Hi Setpoints for Reactor Bldg Vent Radiation Monitors Were Discovered High.Caused by Setpoint Drift.Setpoint Changed

ML20005A014
Person / Time
Site:	Hatch
Issue date:	06/25/1981
From:	Rogers W GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20005A009	List: 05000366/LER-1981-049, Forwards LER 81-049/03L-0 05000366/LER-1981-049-03, /03L-0:on 810602,hi Hi Setpoints for Reactor Bldg Vent Radiation Monitors Were Discovered High.Caused by Setpoint Drift.Setpoint Changed
References
LER-81-049-03L, LER-81-49-3L, NUDOCS 8106290248
Download: ML20005A014 (2)

LER-1981-049, /03L-0:on 810602,hi Hi Setpoints for Reactor Bldg Vent Radiation Monitors Were Discovered High.Caused by Setpoint Drift.Setpoint Changed

Event date:
Report date:
3661981049R03 - NRC Website

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cia *T 60 61 OOCKET NUM8ER 68 63 EVENT DATE 74 75 REPOHT DATE 80 5

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 121 lWith the Unit in steady state operation at 2435 MWT and while the inst-1 M l rument shop was attempting to change setpoint of alarms using procedure t E lHNP-2-5228, the Hi Hi setpoints for the reactor building vent radiation i I monitors were discovered to be at 35,000 cpm instead of 13,030 cpm.

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os The same type instruments are utilized on Unit 1.

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50-321/1981-042.

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33 34 34 36 37 40 di 12 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h The set-l I The cause of this event has been attributed to setpoint drift.

1 O 8 'lcoint'was immediately chanced to the correct settino.

No further re-J 1portina is reauired.

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LER No'.:

5d-366/1981-049

- Licensee:

Georgia Power Company Facility:

Edwin I. Hatch Docket No.:

50-366 Narra ive Report for LER 50-366/1981-049 While the Plant was at steady state operation at 2435 MWT the Reactor Building Vent Radiation Monitors HI Hi alarms were found to alarm at 35,000 cpm.

The setpoint should have been 13,030 cpa.

This exceeds the limit at which it was suppose to be set.

This is a

repetitive occurrence and was last reported on LER 50-321/1981-042.

The setpoint was immediately changed to the correct setting.

Since the Hi alarm never annunicated during the interval between this check and the last one it follows there was no release of any significance to the environment and the gaseous release from the reactor building never exceeded the limits in the Environmental Technical Specifications.

The setpoint being too high has been attributed to setpoint drift.

This type of instrument is utilized in other systems on both unita, but no generic problems have been discovered at this time.

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