05000321/LER-1981-049-03, /03L-0:on 810605,reactor Core Isolation Cooling Valve Would Not Open by Control Switch During Testing.Caused by Relay Cover Binding on Logic Relay.Relay Cover Installed Correctly

/03L-0:on 810605,reactor Core Isolation Cooling Valve Would Not Open by Control Switch During Testing.Caused by Relay Cover Binding on Logic Relay.Relay Cover Installed Correctly

ML20005A038
Person / Time
Site:	Hatch
Issue date:	06/25/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20005A036	List: 05000321/LER-1981-049, Forwards LER 81-049/03L-0 05000321/LER-1981-049-03, /03L-0:on 810605,reactor Core Isolation Cooling Valve Would Not Open by Control Switch During Testing.Caused by Relay Cover Binding on Logic Relay.Relay Cover Installed Correctly
References
LER-81-049-03L-01, LER-81-49-3L-1, NUDOCS 8106290282
Download: ML20005A038 (2)

LER-1981-049, /03L-0:on 810605,reactor Core Isolation Cooling Valve Would Not Open by Control Switch During Testing.Caused by Relay Cover Binding on Logic Relay.Relay Cover Installed Correctly

Event date:
Report date:
3211981049R03 - NRC Website

text

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DOCK ET NUMagR ul 69 EVENT DATE 14 in HEPORrCATE WO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 i On June 5, 1981, with the reactor in the startup and hot standby mode, l

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r.u si i while performing HNP-1-3400, RCIC Valve Operability Test, the 1E51-F1'15 l

o-I would not open by the control switch.

Per Tech Spec 4.5.E.2, the RCIC 1

gI was declared inoperative.

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40 44 42 43 44 47 CAUSC DESCRIPTION AND CORRECTIVE ACTIONS El The cause of the valve not openin.g was due to a relay cover bindino on i

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was installed correctly and the valve functionally tested with I

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LER No. : 50-321/1981-049 Licensee: Georgia Power Company Facility: Edwin I. Hatch Docket No.: 50-321 On June 5, 1931, with the reactor in the startup and hot standby mode, HNP-1-3402, P.CIC Valve Operability Test, was being performed.

During this test, IE51-F105, RCIC Outboard Turbine Exhaust Vacuum Breaker Valve,'

failed to operate.

Per Tech Spec 4.5.E.2, RCIC was then declared inop-erative.

It was discovered after thorough investigation, the valve failure was due-to a protective cover binding on a logic relay.

The relay is located in a panel in the control room and during the recent refueling outage, ex-tensive work was performed in this panel.

During this work, it was deter-mined that the relay cover was accidentally bumped or knocked off and improperly replaced thus causing the relay to bind and fail to operate.

The relay cover was removed, the relay was inspected, cleaned and the protective cover was reinstalled correctly.

The valve was then functionally tested and passed with satisfactory results.

Public health and safety was not affected by this incident and this is not a repetitive occurrence.

A generic review reveals no inherent problems of this type.

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