05000366/LER-1981-035-03, /03L-0:on 810413,during Steady State Operation, Reactor Bldg to Torus Vacuum Breaker Isolation valve,2T48- F310,failed to Open Due to Failure of Differential Pressure switch,2T48-N210.Mechanism Cleaned.New Switch Ordered

/03L-0:on 810413,during Steady State Operation, Reactor Bldg to Torus Vacuum Breaker Isolation valve,2T48- F310,failed to Open Due to Failure of Differential Pressure switch,2T48-N210.Mechanism Cleaned.New Switch Ordered

ML20008F947
Person / Time
Site:	Hatch
Issue date:	05/05/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345H295	List: 05000366/LER-1981-035, Forwards LER 81-035/03L-0 05000366/LER-1981-035-03, /03L-0:on 810413,during Steady State Operation, Reactor Bldg to Torus Vacuum Breaker Isolation valve,2T48- F310,failed to Open Due to Failure of Differential Pressure switch,2T48-N210.Mechanism Cleaned.New Switch Ordered
References
LER-81-035-03L, LER-81-35-3L, NUDOCS 8105120383
Download: ML20008F947 (2)

LER-1981-035, /03L-0:on 810413,during Steady State Operation, Reactor Bldg to Torus Vacuum Breaker Isolation valve,2T48- F310,failed to Open Due to Failure of Differential Pressure switch,2T48-N210.Mechanism Cleaned.New Switch Ordered

Event date:
Report date:
3661981035R03 - NRC Website

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8 EVENT DESCRIPTION ANo pro 8 ABLE CONSEQUENCES h While the plant was in steady state operation at 2282 kit. Reactor Buildinq

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LER No.: 50-366/1981-035 Licensce: Georgia Power Company facility: Edwin I. itatch Doc ke t - No. : 50-366 N0rrative Report for LER No. 50-366/1981-035 '

On April I',1981, while the plant was in steady state operation at 2282-Milt, Reactor Building to Torus Vacuum Breaker Isolation Valve, 2T48-F310, failed open. Tech Specs Section 3.6.3. requires that primary containment isolation valves be operable. Redundant Reactor Building to Torus Vacuum Breaker Isolation Valve,-2T48-311, was operable. Plant operation was not.

affected as a result of-this event. The health and safety of the public was not 'affected. This event is repetitive as last'-reported on Reportable Occurrence Report No. 50-366/1980-96.

The cause of the event has been attributed to Reactor Building to Torus Differential Pressure Switch, 2T48-N210. The failure was due to too great of a reset span possibly caused by a sticking switch mechanism. The mech-anism was cleaned with electrical contact lubricant cleaner, then' exercised

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several times and checked for correct operation. The switch was then recalibrated per !!NP-2-5240, Static-o-ring Pressure Switch Calibration, and returned to service.

A new switch has been ordered to replace the existing switch.

A generic reveiw revealed no inherent problems with this switch for this particular application.

Unit I does not use this type switch for this application.

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