05000366/LER-1980-055-03, /03L-0:on 800506,while Performing Reactor Core Isolation Cooling Steam Line Pressure Instrument Functional Test,Outboard Steam Supply Line Isolation valve,2E51-F608, Failed to Operate.Caused by Failed Operator Torque Switch

/03L-0:on 800506,while Performing Reactor Core Isolation Cooling Steam Line Pressure Instrument Functional Test,Outboard Steam Supply Line Isolation valve,2E51-F608, Failed to Operate.Caused by Failed Operator Torque Switch

ML19312E607
Person / Time
Site:	Hatch
Issue date:	05/29/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19312E600	List: 05000366/LER-1980-055, Forwards LER 80-055/03L-0 05000366/LER-1980-055-03, /03L-0:on 800506,while Performing Reactor Core Isolation Cooling Steam Line Pressure Instrument Functional Test,Outboard Steam Supply Line Isolation valve,2E51-F608, Failed to Operate.Caused by Failed Operator Torque Switch
References
LER-80-055-03L, NUDOCS 8006050372
Download: ML19312E607 (2)

LER-1980-055, /03L-0:on 800506,while Performing Reactor Core Isolation Cooling Steam Line Pressure Instrument Functional Test,Outboard Steam Supply Line Isolation valve,2E51-F608, Failed to Operate.Caused by Failed Operator Torque Switch

Event date:
Report date:
3661980055R03 - NRC Website

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Instru-1 ourin, normal aneration while performina RCIC Steam Line Pressure EL ment functional Test per Tech Spec 4.3.2.2, the RCIC Outboard Steam Supply l

l Line Isolation Valve, 2E51-F003, failed to isolate.

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.14 CAUSE oE"CRIPTION AND CCHRECTIVE ACTIONS h The cause of the RCIC Outboard Steam Supoly Line Isolation Valve fa, lure l

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NARRATIVE

REPORT Georgia Power Comagny Plant E.1. Hatch Baxley, Georgia 31513 Reportable Occurrence Report No. 50-365/1980-055, a

During normal plant operation, while perfonning RCIC Steam Line Pressure Instrument Functional Test and Calibration Procedure, HNP-2-3409, per Tech Spec 4.3.2.2, the plant operator observed that the RCIC Outboard Tne Steem Supply Line Isolation Valve, 2E51-F008, failed to isolate.

RCIC Inboard Steam Supply Line Isolation Valve, 2E51-F007, was closed per The HPCI System was not affected and remained operable.

Tech Spec 3.6.3.a.

Ihr cause of the RCIC Outboard Steam Supply Line Isolation Valve failure ne to a failure of the valve operator torque switch. This is wat no' re-occurring event.

> 31ve operator torque suitch was repaired, proper valve operation Th>

ve:.fied and the RCIC Outboard Steam Supply Line Isolation Valve was returned to service. The RCIC Outboard Steam Supply Line Isolation Valve, 2E51-F008, is redundant to the RCIC Inboard Steam Sepply Line Isolation Both isolation valves are normally open so the inability Valve, 2E51-F007.

of the RCIC Outbcard Steam Supply Line Isolation Valve to close would not Failure of the have interfered with RCIC Turbine Auto Start function.

RCIC Outboard Steam Supply Line Isolation Valve to close on an isolation signal would not have prevented RCIC Steam Supply Line Isolation because of the redundant inboard isolation valve. Although the plant has experienced occasional valve operator torque switch failure, the failure does not indicate a generic problem.

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