05000366/LER-1980-133-03, /03L-0:on 800923,reactor Water Level Switches 1 & 2 Tripped at 121 & 123 Inches of Water,Respectively,Contrary to Tech Spec Max of 117.19 Inches.Caused by Setpoint Drift. Switches Recalibr & Tested Successfully

/03L-0:on 800923,reactor Water Level Switches 1 & 2 Tripped at 121 & 123 Inches of Water,Respectively,Contrary to Tech Spec Max of 117.19 Inches.Caused by Setpoint Drift. Switches Recalibr & Tested Successfully

ML19347C028
Person / Time
Site:	Hatch
Issue date:	10/09/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19347C026	List: 05000366/LER-1980-133, Forwards LER 80-133/03L-0 05000366/LER-1980-133-03, /03L-0:on 800923,reactor Water Level Switches 1 & 2 Tripped at 121 & 123 Inches of Water,Respectively,Contrary to Tech Spec Max of 117.19 Inches.Caused by Setpoint Drift. Switches Recalibr & Tested Successfully
References
LER-80-133-03L, LER-80-133-3L, NUDOCS 8010160475
Download: ML19347C028 (2)

LER-1980-133, /03L-0:on 800923,reactor Water Level Switches 1 & 2 Tripped at 121 & 123 Inches of Water,Respectively,Contrary to Tech Spec Max of 117.19 Inches.Caused by Setpoint Drift. Switches Recalibr & Tested Successfully

Event date:
Report date:
3661980133R03 - NRC Website

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60 EVENT OATE 74 7b REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h lOl2l l With the plant in steady state operation at 2414 MWT while perforraing HNP-l l

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10 i s i i Tech. Specs Table 3.3.2-2 requires actuation @ f 117.19 inches of water.

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LER /!: 50-366/1980-133 Licensee: GEORGIA POWER CO !PANY Facility Name:

EDWIN I. IIATCH Docket if : 50-366

Narrative

Report for LER 50-366/1980-133

's On September 23, 1980, while the reactor was operating at steady state power of 2414 MWT, while performing UNP-2-3101, Reactor Water Level Instrument F.T.6C., reactor level switch 2B21 NO25A switches 162 were found to actuate at 121 and 123 inches of water increasing respec-tively Tech Specs Table 3.3.2-2 requi res actuation at < 117.19 inches of water increasing.

Redundant switches 2B21 N025B and 2B21 NO24 A&B were operable and in tolerance. Plant operation and the public health and safety were not affected. This event was repetitive as last reported on LER // 50-366/1980-72.

The cause of this event has been attributed to setpoint drift. The switch immediately recalibrated and functionally tested successfully.

Unit was one uses the same type of level indicating switch, a Yarway model 4418, for this application.

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A generic review reveal no inherent problems.

The Unit is now in full compliance and no further reporting is required.

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