05000321/LER-1980-017-03, /03L-0:on 800201,while Performing MSIV Closure Instrumentation Ft&C,Scram Relays IC71-K3G & H Found de-energized W/Associated MSIVs Fully Open.Caused by Loose Limit Switch on Actuating Arm.Arm Reset & Tightened

/03L-0:on 800201,while Performing MSIV Closure Instrumentation Ft&C,Scram Relays IC71-K3G & H Found de-energized W/Associated MSIVs Fully Open.Caused by Loose Limit Switch on Actuating Arm.Arm Reset & Tightened

ML19296C592
Person / Time
Site:	Hatch
Issue date:	02/19/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19296C580	List: 05000321/LER-1980-017, Forwards LER 80-017/03L-0 05000321/LER-1980-017-03, /03L-0:on 800201,while Performing MSIV Closure Instrumentation Ft&C,Scram Relays IC71-K3G & H Found de-energized W/Associated MSIVs Fully Open.Caused by Loose Limit Switch on Actuating Arm.Arm Reset & Tightened
References
LER-80-017-03L, LER-80-17-3L, NUDOCS 8002260686
Download: ML19296C592 (2)

LER-1980-017, /03L-0:on 800201,while Performing MSIV Closure Instrumentation Ft&C,Scram Relays IC71-K3G & H Found de-energized W/Associated MSIVs Fully Open.Caused by Loose Limit Switch on Actuating Arm.Arm Reset & Tightened

Event date:
Report date:
3211980017R03 - NRC Website

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2 i With the reactor in the run mode. while performinn the MSIV Closure Instru-1 o

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ment FT&C, the IC71-K3G and IC71-K3H scram relavs were found de-ener21:ed l

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s t cents of T.S. Table 3.1-1 could be met as the relays were de-energized 1

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was due to an actuatinz arm of a limit switch on the IB21-F028D ".SIV.

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IC71-K3H relays were v 'ified to be eneraized on February 9, 1980.

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NARRATIVE

REPORT Ceorgia Power Company Plant E. I. Hatch Baxley, Georgia 31513 Reportable Occurrence Report No. 50-321/1980-017.

With the reactor at 2417 MWt, while performing the Main Steam Isolation Valve Closure Instrument Functional Test and Calib ration, on February 1,1980, the IC71-K3G and IC71-K3R scran relays were found de-energized with the IB21-F022D and IB21-F028D Main Steam Isolation Valves fully open.

The requirements of Technical Specification Table 3.1-1 could be met as the relays ~were de-energized uhich would be their state if the associated Main Steam Isolation Valves were to close to less than 907; full open.

To verify that the Reactor Protection System logic for a scram had not been impaired, the 1321-F0283 and 1321-F028C Isolation Valves were tested to insure a half scram signal could be received.

The de-energi=ation of the IC71-K3C and IC71-D3R scram relays was due to an actuating arm of a limit switch on the IB21-F028D Outboard Isolation Valve having vibrated loose.

The actuating arm was reset and tightened on February 9, 1980. A Main Steam Isolation Valve Limit Switch Inspection was then performed and the IC71-K3G and IC71-K3H relays were verified to be energized.

The other Namco Controls limit switches in this area were also checked to insure that none were loose.

Namco Control Limit Switches are used in several places on both Unit I and Unit II, but the random failures that have occurred have been infrequent and are not considered as generic problems, i

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