05000366/LER-1981-051-03, /03L-0:on 810610,reactor Bldg to Torus Vacuum Breaker Isolation Valve 2T48-F310 Failed Open.Caused by Sticking Switch Reset.Switch Cleaned,Lubricated & Tested

/03L-0:on 810610,reactor Bldg to Torus Vacuum Breaker Isolation Valve 2T48-F310 Failed Open.Caused by Sticking Switch Reset.Switch Cleaned,Lubricated & Tested

ML20009F619
Person / Time
Site:	Hatch
Issue date:	06/30/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009F608	List: 05000366/LER-1981-051, Forwards LER 81-051/03L-0 05000366/LER-1981-051-03, /03L-0:on 810610,reactor Bldg to Torus Vacuum Breaker Isolation Valve 2T48-F310 Failed Open.Caused by Sticking Switch Reset.Switch Cleaned,Lubricated & Tested
References
LER-81-051-03L-01, LER-81-51-3L-1, NUDOCS 8107310358
Download: ML20009F619 (2)

LER-1981-051, /03L-0:on 810610,reactor Bldg to Torus Vacuum Breaker Isolation Valve 2T48-F310 Failed Open.Caused by Sticking Switch Reset.Switch Cleaned,Lubricated & Tested

Event date:
Report date:
3661981051R03 - NRC Website

text

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60 61 COCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBA8LE CONSEQUdNCES h While the plant was in steady state operation at 2400 MWt, Reactor Build-oJ } [_

ing to Torus Vacuum Breaker Isolation Valve, 2T48-F310, failed open. Tech l

g33 l Specs 3.6.3 requires that Primary Containment Isolation Valves be operable.

I o141 1 Redundant Reactor Building to Torus Vacuum Breaker Isolation Valve, 2T48-l o Isl l l

Neither plant operation nor public health and safe-l J o is l l F311, was operable.

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lol7}l ty were affected.

Occurr ve Report No. 50-366/1981-035.

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33 34 35 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND COR AECTIVE ACTIONS The cause of the event has been attribtued to Reactor Ruildina to Torus I

Iilo1 I li li i i Differential Pressure Switch. 2Ta8-N210.

The failure was due to the I

switch reset stickina. The switch was cleaned, lubricated and functionally I

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50-366/1981-051 Licensee:

Georgia Power Company Facility:

Edwin I. Hatch Docket No. :

50-366

Narrative

Report i

for LER 50-366/1981-051 On June 10, 1981, while the plant was.in steady state operation at 2400 PWt, Reactor Building to Torus Vacuum Breaker Isolation Valve, 2T48-F310, failed Tech Specs 3.6.3 requires that Frimary Containment Isolation Valves open.

be ope"able.

Redundant Reactor Building to Torus Vacuum Breaker Isolation Valve, 2T48-F311, was operable.

Neither plant operation nor public health and safety were affeuted.

This is a repetitive event as last reported on Reportable Occurrenc t Report No. 50-366/1981-035.

4 The cause of the event has been attributed to Reactor Building to. Torus Differential Pressure Switch, 2T48-N210.

The failure was due to the switch, 2T48-N210.

The failure was due to the switch reset sticking.

The switch was cleaned, lubricated and functionally tested satisfactorily.

A generic review revealed no inherent problems with this type switch.