ML20009F619

LER 81-051/03L-0:on 810610,reactor Bldg to Torus Vacuum Breaker Isolation Valve 2T48-F310 Failed Open.Caused by Sticking Switch Reset.Switch Cleaned,Lubricated & Tested

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: ML20009F607 ML20009F619
References
LER-81-051-03L-01, LER-81-51-3L-1, NUDOCS 8107310358
Download: ML20009F619 (2)

Text

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While the plant was in steady state operation at 2400 MWt, Reactor Build-oJ } [_

g33 l ing to Torus Vacuum Breaker Isolation Valve, 2T48-F310, failed open. Tech l o141 1 Specs 3.6.3 requires that Primary Containment Isolation Valves be operable. I Redundant Reactor Building to Torus Vacuum Breaker Isolation Valve, 2T48- l o Isl l l

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

ty were affected. This is a repetitive event as reported on Renortable l lol7}l 0m,; Occurr ve Report No. 50-366/1981-035. I DE ODE SUSC E COMPONENT CODE SUSCODE SU E tit} l S 10.j@ IE l@ lE l@ l : l NI S l T l R l U l@ I S l@ l 20Z l @ 18 19 9 10 11 12 13 8 REVISION SEQUENTIAL OCCURRENCE REPORT REPORT NO. CODE TYPE N O.

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43 44 47 CAUSE DESCRIPTION AND COR AECTIVE ACTIONS I

Iilo1 I The cause of the event has been attribtued to Reactor Ruildina to Torus Differential Pressure Switch. 2Ta8-N210. The failure was due to the I

li li i i l i 6 21 I switch reset stickina. The switch was cleaned, lubricated and functionally I l

li13l l tested satisfactoril y.

l li l41 I 80 OTHER STATUS OtS O RY DISCOVERY DESCRIPTtON ST JS  % POWER l i l 5 l [,E,j@ l 0l 91 8l@l Operator observation l NA l lA l@l'8 8 ACTIVITY COTTENT AMOUNT OF ACTIVITY LOCATION OF RELEASE RELEASED OF RELEASE NA l l NA l Ii 16 l l Z l @ l Zl@l PERSONNEL EXPOS ES NUMBER TYPE DESCRIPTION NA l li 171 l 0 l 0 id@lZl@l P eRSO iN;uWiES NUM86. DESCRIPTION l

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'7 8 9 41 12 LOSS OF OR OAMAGE TO FACILITY TYDE DESCRIPTION NA l li 191 8 9 l Z [@l10 80 7

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,SsV E DESCRIPTION8107310358 h 810630 llllll(([f(ll3 PDR ADOCK 05000366 l I 2 l a l l N f@l S PDR 68 s9 80i 7 8 9 10 m w egg R. T. Nix, Supt. of Maint. pgayg; EW-N {

e LER No.: 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 open. Tech Specs 3.6.3 requires that Frimary Containment Isolation Valves 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.

.