ML19210D118

LER 79-116/03L-0:on 791025,HPCI Steam Line Inboard Valve Failed to Isolate During Calibr & Testing.Caused by Conservative Setting of Torque Switch.Engineering Package Review Revealed That Higher Setting Should Be Used

ML19210D118
Person / Time
Site:	Hatch
Issue date:	11/14/1979
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19210D113	List: ML19210D112 ML19210D118
References
LER-79-116-03L, LER-79-116-3L, NUDOCS 7911200551
Download: ML19210D118 (2)

Text

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L[CENS,EE EVENT REPORT .

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) o T l c l A l c 11 lH l2 l@lIS010 l 010 l LICEr*5E 0 l 0 NVVet*4 l 0 l 0 l 0 l 010J$l@26[4LILENGL l1 l1 TvrEl1 l1 JJ lglSt l CAT W lg 8 9 LICEN5LE CODE I4 CC "EPOA W ij 3o ,gCE l L l@l 0] 5l OOCKETe.LY3EH 0l 0l 0 l 3 l 6 l666 @l 1 EVENT l 0 lDATE 2 l 5 l 7 l 9 @lRtPORT 74 75 1l 1]Il4l7l9]@

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1. LO 61 63 EVEN% DESCRIPTION AND PROBACLE CONSEQUENCES h l With ti,el reactor ~in the run mode, while performing procedure IINP-2-3307,, (!!PCI Steam l o 2

.. v O 3 l Line Differential Pressure Instrument Functional Test and Calibration), the llPCI Steam l l

34 l Line Inboard Valve failed to isolate.' The HPCI Steam'Line Outboard IsolatiCn Valve

.O s l was closed and secured and the HPCI system was declared inoperabic per Technical l so s [ Specification 3.5.1. Public health and safety were not affected by this incident. l lo 7 i This is a repetitive occurrence and was reported on LER 79-114. [

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1 O l The failure of the HPCI Steam Line Inboard Valve to isolate was due to the torque l i i i I switch being set on a conservative setting. The engineering package for the valve was j i 7 l reviewed and it was determined that a higher setting could be used to provide more l 3 l reliable closing of the valve. The torque switch was set to the new value and the l The valve was then cycled and found to be operating (Copt) i 4 l valve placed back in service. 80 7 8 9

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Pt40N E: 912-367-7781 NAME OF PREPARER

Plant E. I, flatch Georgia Power Company -

Baxicy, Georgia 31513 Reportabic Occurrence Report No. 50-366/1979-116 Cause Description and Corrective Actions (cont) satisfactorily.

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