ML20071A922

Updated 82-067/03X-1:on 820722,dampers OVE07YA & OVE09YA Would Not Operate Manually.Caused by Blown Oil Seal in Actuator OFZ-VE007B (Damper OVE09YA).Actuators Repaired & Shop Tested Satisfactorily

ML20071A922
Person / Time
Site:	LaSalle
Issue date:	02/09/1983
From:	Tolbert R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20071A909	List: 05000373/LER-1982-067, Forwards Updated LER 82-067/03X-1 ML20071A922
References
LER-82-067-03X, LER-82-67-3X, NUDOCS 8302250228
Download: ML20071A922 (3)

Text

UPDATED REPORT--PREVIOUS EME EN REPORT DATED 9/18/82 CONTROL BLOCK: l s

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EVENT QATE l 8 l 274 lgl75o g REPORT 2 l 0 DATE 3 9 l8 l3 80 jg 8 60 68 OOCKET NgM3ER EVENT DESCRIPT1CN AND PROBASLE CCNSECUENCES h Upon inspection OVE09YA was

,o ( 21 l Dampers OVE07YA and OVE09YA would not operate manually.

l found to have a blown oil seal which could not be. rapidly repaired. Probable conse-l 3, ,

quences were minimal, because another VE train was operational _ and the subject dampers

,,,,g failed to the open position, so that "A't train could have been used in an emergency 1

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]1g 4 43 44 4; cAuSE DESCRIPTION AND CORRECTIVE ACTICNS h li l o g l The blown oil seal prevented the unit from operating properly by depressurizing the g ; uait the damper actuators were repaired in accordance with work request Ll7464 and shop

tested satisfactorily. LIS-VC-03 was performed wi th satisfactory result, to verify

},,3j g proper operation of the dampers' manually. 3 5

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I. LER NUMBER: 82-067/03X-1

11. LASALLE COUNTY STATION: Unit 1 Ill. DOCKET NUMBER: 050-373/374 IV. EVENT DESCRIPTION:

On July 22,1982, at 1215 hours0.0141 days <br />0.338 hours <br />0.00201 weeks <br />4.623075e-4 months <br />, the "A" train of the Auxiliary Electric Equipment Room (VE) HVAC system was shut down and taken out of service to repair charcoal filter isolation dampers OVE07YA and OVE09YA, in accordance with Work Request Ll7464. Upon investigation, it was found -

that a seal in the actuator of damper OVE09YA,had failed. Af ter wiring both dampers open, their " fail-safe" position, the actuators were removed and transported to the Electrical Maintenance shop for repair. No spare seals were held in stores, so rapid repair of the actuator could not be effected. The system was declared inoperable on July 22, 1982, cz 1825 hours0.0211 days <br />0.507 hours <br />0.00302 weeks <br />6.944125e-4 months <br />, in accordance with Technical Specification 3.7 2.

V. PROBABLE CONSEQUENCES OF THE EVENT:

,' The probable consequences of the event were minimal, based on the follow-l ing factors:

1) The "B" train of the VE system was fully operable, and was utilized while the "A" train was being repaired.

2) Charcoal filter isolation dampers OVE07YA and OVE09YA were wired l

open, their " fall-safe" position, so that in an emergency situation the "A" train could have been operated, if needed.

! During the course of the event a reactor startup was in progress. Upon

! reviewing the system status, in preparation for the startup, it was deter-mined that the system was technically not inoperable in the configuration it was in, since the "A" train would have performed its function satisfac-torily, if required. Consequently, the startup was continued.

The plant was maintained in a safe condition at all times and there was no threat to the health and safety of the public.

VI. CAUSE:

Upon inspection, actuator 0FZ-VE007A (damper OVE07YA) had no indication of hydraulic oil leakage or electrical malfunction. Actuator 0FZ-VE007B (damper OVE09YA) was found to have a damaged upper piston seal. This seal isolates the hydrauli.c piston cylinder from the control plate.

Failure of this seal allowed hydraulic oil to escape from the piston cylinder, resulting in de pressurizing the unit. This de-pressurization returned the damper to its failed state.

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' ' -* (ER NUMBER: 82-067IO3X-1 I j

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Vll. CORRECTIVE ACTION:

Both actuators were disassembled, cleaned, repaired as necessary and then reassembled in accordance with Work Request L17464. The actuators were shop tested satisfactorily and reinstalled in the system. ' Dampers OVE07YA and OVE09YA were then tested in accordance wi th LIS-VC-03,- with ,

satisfactory results.

No apparent cause for the failure of damper OVE07YA could be' discovered, j The upper piston seal on damper OVE09YA failed because of many hours of

, usage. No generic problem or defect seems evident. ,

Prepared by: R. E. Tolbert I

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