05000366/LER-1980-096-03, /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

/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: 05000366/LER-1980-096-03, /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
References
LER-80-096-03L, LER-80-96-3L, NUDOCS 8007170468
Download: ML19320C624 (2)

LER-1980-096, /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

Event date:
Report date:
3661980096R03 - NRC Website

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LICALSGE EVENT REPORT

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(PLEASE PRINT CR TYPE ALL REQUIRED INFORMATIONI

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8 60 61 DOCKET NUMBEH La 03 EVENT DATE 14 7b REPORT DATE U0 EVENT DESCRIPTION AND PRODABLE CONSEQUENCES h D l2l l With the reactor inode switch in run, reactor buildino to torun vacuum break-l l

D l 31 l er isolation valve, 2T48-F311, failed open.

There was no effect on safe

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

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igoll 2T48-F311, failed open was due to the failure of delta pressure switch l

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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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