ML19330A529

Revised LER 80-096/03L-1:on 800619,w/reactor Mode Switch in Run,Reactor Bldg to Torus Vacuum Breaker Isolation Valve, 2T48-F311,failed.Caused by Failure of Delta Pressure Switch 2T48-N211.Micro Switch Replaced

ML19330A529
Person / Time
Site:	Hatch
Issue date:	07/17/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19330A524	List: ML19330A523 ML19330A529
References
LER-80-096-03L, LER-80-96-3L, NUDOCS 8007280526
Download: ML19330A529 (2)

Text

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/4 15 l 1 lDAT7El 8 l 800 lh EVENT DESCRIPTION AND PROBABLE CONSEO*JENCES h 012] l With the reactor mode switch in run, reactor building to torus vacuum break- _]

o]3] [ er isolation valve, 2T48-F311, failed open on 6/19/80 and again on 6/27/80. l 0 l4 I l There was no affect on safe plant operation, because redundant valve 2T48- l o Isl l F310 was still operable. The health and safety of the public was not af- l 0 l6 l l fccted. This is a repetitive event and was last reported on Reportable l 0l7ll Occurrence Report No. 50-366/1980-054. l 0181l l 8 9 80 SYSTEM CAUSE CAUSE COYP. VALVE CODE CODE SUBCODE COVPONENT CODE SUBCODE SU0 CODE ol9l 8

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41 l42Ml@ lAl@ 44[ l3 l8 l2 lg 43 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1Io l l The reason the reactor building to torus vacuum breaker isolation valve, l TITl i 2T48-F311, failed open was due to the failure of delta pressure switch l il7l l 2T48-N211, reactor building to torus delta pressure switch. ThE. micro l

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Georgia Power Company Plant E. I. Ilatch Baxley, Georgia Reportable Occurrence Report No. 50-366/1980-096, Re v. 1.

With the reactor mode switch in the run positien, reactor building to torus vacuum breaker isolation valve, 2T48-F311, failed to open on 6/19/80 and again on 6/27/80. There was no affect 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/J380-054.

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. The micro switch was exercised and calibrated initially and later replaced. 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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