05000265/LER-1980-013-03, /03L-0:on 800428,while Performing LPCI Motor Operated Valve Operability Test & RHR to Suppression Chamber Test,Cooling Valve Mo 2-1001-36A Failed to Close.Caused by Binding of Plunger Arm on Auxiliary Interlock Contacts

/03L-0:on 800428,while Performing LPCI Motor Operated Valve Operability Test & RHR to Suppression Chamber Test,Cooling Valve Mo 2-1001-36A Failed to Close.Caused by Binding of Plunger Arm on Auxiliary Interlock Contacts

ML19316B140
Person / Time
Site:	Quad Cities
Issue date:	05/27/1980
From:	Robert Murray COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19316B136	List: 05000265/LER-1980-013, Forwards LER 80-013/03L-0 05000265/LER-1980-013-03, /03L-0:on 800428,while Performing LPCI Motor Operated Valve Operability Test & RHR to Suppression Chamber Test,Cooling Valve Mo 2-1001-36A Failed to Close.Caused by Binding of Plunger Arm on Auxiliary Interlock Contacts
References
LER-80-013-03L-04, LER-80-13-3L-4, NUDOCS 8006110369
Download: ML19316B140 (2)

LER-1980-013, /03L-0:on 800428,while Performing LPCI Motor Operated Valve Operability Test & RHR to Suppression Chamber Test,Cooling Valve Mo 2-1001-36A Failed to Close.Caused by Binding of Plunger Arm on Auxiliary Interlock Contacts

Event date:
Report date:
2651980013R03 - NRC Website

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60 61 DOCKETNUMBER 68 63 EVENT DATE 14 75 REPORT DATE 80 EVENT DESCRIPTION AND pro 8ABLE CONSEQUENCES h While performing the LPCI Motor Operated Valve Operability Test, procedure QOS 1000-3,l 10121 l Ic e 3! I the RHR to suppression chamber test and cooling valve MO 2-1001-36A failed to close. [

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LER NUMBER: LER/R0 80-13/03L-0 ll.

LICENSEE NAME: Commonwealth Ediscn Company Quad-Cities Nuclear Power Station Ill. FACILITY NAME: Unit Two IV.

DOCKET NUMBER: 050-265 V.

EVENT DESCRIPTION

On April 28, 1980, while performing the LPCI Motor Operated Valve Oper-ability Test, procedure QOS 1000-3, the RHR to suppression chamber test and cooling valve, MO 2-1001-36A, failed to close. The monthly survell-lance is performed to comply with the surveillance requirements specified in Technical Specification 4.5.A.I.d.

The normally closed test valve had been opened satisfactorily but would not close. Work Request Q04949 wac written to inspect the valve operator and circuit.

VI.

PROBALLE CONSEQUENCES OF THE OCCURRENCE:

The probable consequences of this occurrence were minimal. The MO 2-1001-36A valve is used for testing the A RHR loop.

Since the valve could be opened, the availability of suppression pool cooling from the A loop was not compromised. The valve could have been manually closed if necessary, in addition, the upstream isolation valve, MO 2-1001-34A, was fully operable to provide isolation upon a LPCI initiation condition had it been necessary. The B Containment Cooling and spray loop was also available for use.

Safe operation of the reactor was not affected as a result of this occurrence.

Vil. CAUSE:

The cause of this occurrence is attributed to equipment failure. The auxiliary interlock contacts associated with the valve circuit breaker were found to be faulty by not fully returning, consequently not allowing the valve to go closed.

On January 29, 1980, during the Unit Two outage, this auxiliary contact mechanism, along with others on similarly equipped motor operated valves, had been changed-out with respect to IE Bulletin 75-05 An examination of the component and the fact that this was the only failure out of all the components installed, Indicates the problem was unique. Subsequently there appears to be no basis on which to assume that this failure compro-mises the intent of IE Bulletin 75-05 to improve CR105X 100N component reliability. The Unit One CR105X devices are scheduled for replacement during the upcoming September,1980 Refueling Outage.

Vill. CORRECTIVE ACTION:

The immediate' corrective action was to replace the auxiliary contact and verify proper operation of the MO 2-1001-36A valve by stroking the valve three times satisfactorily.