05000220/LER-1980-014-03, /03L-0:on 800717,during start-up Performance for IE Bulletin 80-17 Auto Scram Test,Operability Test Attempted on Valve During Shutdown Period.Valve Failed to Open Upon Manual Initiation.Valve Removed & Disassembled

/03L-0:on 800717,during start-up Performance for IE Bulletin 80-17 Auto Scram Test,Operability Test Attempted on Valve During Shutdown Period.Valve Failed to Open Upon Manual Initiation.Valve Removed & Disassembled

ML18037A281
Person / Time
Site:	Nine Mile Point
Issue date:	08/08/1980
From:	Harrison P NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17053B860	List: 05000220/LER-1980-014, Forwards LER 80-014/03L-0 05000220/LER-1980-014-03, /03L-0:on 800717,during start-up Performance for IE Bulletin 80-17 Auto Scram Test,Operability Test Attempted on Valve During Shutdown Period.Valve Failed to Open Upon Manual Initiation.Valve Removed & Disassembled
References
LER-80-014-03L, LER-80-14-3L, NUDOCS 8008250571
Download: ML18037A281 (4)

LER-1980-014, /03L-0:on 800717,during start-up Performance for IE Bulletin 80-17 Auto Scram Test,Operability Test Attempted on Valve During Shutdown Period.Valve Failed to Open Upon Manual Initiation.Valve Removed & Disassembled

Event date:
Report date:
2201980014R03 - NRC Website

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Q 60 61 DOCKET NUMBER 68 69 FVENT DAfE 74 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES IO Durin a routine start-u to erform I.E.Bulletin 80-17 auto scram test an o er-3 ability test on IllilElectromatic Reli.ef valve was attempted as a result of maint-enance performed on tha valve during the preceding shutdown period.

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failed to open upon manual initiation from the control room.

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sequently scrammed as scheduled.

and the valve was then removed and disassembled

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to determine the cause of failure.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS dl There are two designs of the valve disc retainer used at 9MP Unit 81 for maint-enance of the electromatic relief valves.

The first contains a drilled and tapped hole through the pressure retaining portion (for manufacturing and installation purposes) requiring a bolt to be installed to seal the pressure boundaiy.

The second design does not incorporate a through-wall hole, thus eliminating the need for the volt installation.

Inspection of the valve revealed that the first design of the disc retainer had been used, and that the bolt plug had been inadvertently missed during the previous assembly of the valve.

This resulted in the inability of the valve disc to experience the sufficient pressure differential required to open the valve.

Consequently, the bolt was installed and the valve was reinstalled.

During the next reactor start-up the valve was satisfactorily tested for opera-bility.

In addition, a training session was held with the mechanical maintenance personnel to review the disc retainer designs and their correct installation.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS There are two designs of the valve disc retainer used at 9MP Unit /f1 for maint-enance of the electromatic relief valves.

The first contains a drilled and tapped hole through the pressure retaining portion (for manufacturing and installation purposes) requiring a bolt to be installed to seal the pressure boundaiy.

The second design does not incorporate a through-wall hole, thus eliminating the need for tne volt installation.

Inspection of the valve revealed that the first design of the disc retainer had been used, and that the bolt plug had been inadvertently missed during the previous assembly of the valve.

This resulted in the inability of the valve disc to experience the sufficient pressure differential required to open tne valve.

Consequently, the bolt was installed and the valve was reinstalled.

During the next reactor start-up the valve was satisfactorily tested for opera-bility.

In addition, a training session was held with the mechanical maintenance oersonnel to review the disc retainer designs and their correct installation.