05000366/LER-1980-081-03, /03L-0:on 800521,w/reactor Near Rated Power,Loca Signal Accidentally Initiated Resulting in Reactor Scram. Outboard MSIV Failed to Auto Close.Caused by Faulty O-ring in Valve Air Operating Solenoid

/03L-0:on 800521,w/reactor Near Rated Power,Loca Signal Accidentally Initiated Resulting in Reactor Scram. Outboard MSIV Failed to Auto Close.Caused by Faulty O-ring in Valve Air Operating Solenoid

ML19318A399
Person / Time
Site:	Hatch
Issue date:	06/13/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19318A396	List: 05000366/LER-1980-081, Forwards LER 80-081/03L-0 05000366/LER-1980-081-03, /03L-0:on 800521,w/reactor Near Rated Power,Loca Signal Accidentally Initiated Resulting in Reactor Scram. Outboard MSIV Failed to Auto Close.Caused by Faulty O-ring in Valve Air Operating Solenoid
References
LER-80-081-03L, LER-80-81-3L, NUDOCS 8006200483
Download: ML19318A399 (2)

LER-1980-081, /03L-0:on 800521,w/reactor Near Rated Power,Loca Signal Accidentally Initiated Resulting in Reactor Scram. Outboard MSIV Failed to Auto Close.Caused by Faulty O-ring in Valve Air Operating Solenoid

Event date:
Report date:
3661980081R03 - NRC Website

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8 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h EI With the reactor at near rated nower. a LOCA sinnal was accident 1v ini-l i

El tinted resulting in a reactor scram and group I isolation. The 2B21-F028B, i

I El Outboard MSIV f ailed to auto close as required per Tech Spec 3.6. 3.1. The i

EI 2B21-F022B, Inboard MSIV, did auto close.

The 2B21-F028B was manually l

@l closed. There were no ef fects upon public health and safety due to this 1

l ITI L cvent. This was not a repetitive event.

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40 41 42 43 44 47 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h il0ll The f ailure of the 2B21-F028B was due to a f aulty 0-ring in the valve air I

gl operating solenoid. This caused the operating plunger to bind and not l

777ll allow air to operate the valve. The solenoid operator was rebuilt re-l i 13 l l placing the o-ring and internal parts. The valve was then tested and l

l TTTII returned to service.

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NARRATIVE

REPORT Georgia Power Company

. Plant E. I. Ilatch

Baxley, Georgia

. Reportable Occurrence Report No. 50-366/1980-081.

With the reactor at near rated power, a LOCA signal was inadvertently initiated resulting in a'. reactor scram and group I isolation.

During this incident the 2B21-F028B, Outboard MSIV, failed to auto close as per Tech Spec 3.6.3.1.

The 2B21-F022B, Inboard MSIV,' did auto close.

The 2B21-F028B was manually closed, by the control switch, and the unit was placed in hot shutdown. There were no ef fects upon public health and safety due to this event..This was not i

a repetitive occurrence..

The failure of the 2B21-F028B was due to a faulty o-ring in the valve air operating solenoid. The faulty o-ring caused the-operating plunger to bind and not allow air to operate.the valve. The solenoid operator was rebuilt

- replacing the o-ring and internal partc.

The valve was then tested and returned to service, llatch Unit I. and Unit II utilize this type of solenoid operator.

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- a generic review of.the event revealed no previous occurrence of this type and no inherent problem.

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