ML19320C624

LER 80-096/03L-0:on 800627,w/reactor Mode Switch in Run, Reactor Bldg to Torus Vacuum Breaker Isolation Valve, 2T48-F311,failed Open.Caused by Failure of Delta Pressure switch,2T48-N211,reactor Bldg to Delta Pressure Switch

ML19320C624
Person / Time
Site:	Hatch
Issue date:	07/09/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19320C614	List: ML19320C613 ML19320C624
References
LER-80-096-03L, LER-80-96-3L, NUDOCS 8007170468
Download: ML19320C624 (2)

Text

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EVENT DESCRIPTION AND PRODABLE CONSEQUENCES h With the reactor inode switch in run, reactor buildino to torun vacuum break- l D l2l l l

er isolation valve, 2T48-F311, failed open. There was no effect on safe [

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ol4ll plant operation, because redundant valve 2T48-F310 was still operable. The [

o!sl l health and safety of the public was not affected. This is a repetitive [

< l6 l l event and was last reported on Reportable Occurrence Report No. 50-366/ l 1980-054.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS igoll The reason the reactor building to torus vacuum breaker isolation valve, l

,i li l l 2T48-F311, failed open was due to the failure of delta pressure switch l j,,7, 2T48-N211, reactor building to torta delta pressure switch. A new micro  ;

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,,3j l switch was installed and calibrated. l 3l4i j cfrdered to replace existing switch. l 80 f 8 9 ST S '4 POWER OTHER STATUS DSO FY DISCOVERY DESCRIPTION i ls_j l Elh l 0 l 9 l 8 l@l NA l l A l@l Operator observation. l A TlVITY CO TENT RREASED OF REM ASE LOCATION OF RELEASE @

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NARRATIVE REPORT Georgia Power Company Plant E. I. Hatch ,

,Baxley, Georgia 31513 Reportable Occurrence Report No.' 50-366/1980-096.

With the reactor mode switch in the run position, reactor building to torus vacuum breaker isolation valve, 2T48-F311, failed open. There was no effect on safe operation. Redundant valve 2T48-F310 was still operable. The health and safety of the general public was not affected. This is a repetitive event and was last reported on Reportable Occurrence Report No. 50-366/1980-054.

The reason the reactor building to torus vacuum breaker isolation valve, 2T48-F311, failed open was due to the failure of differential pressure switch 2T48-N211, reactor building to torus delta pressure switch. A new micro switch was installed and calibrated and valve 2T48-F311 was returned to operable status. A complete new switch assembly has been ordered and will be installed when it arrives on-site. A follow-up report will be submitted. Unit I does not use these type switches.

No inherent problems were discovered during the generic review.

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