05000338/LER-1980-062-03, /03L-0:on 800708,during Leak Test on Equipment Hatch Escape Lock,Air Leaked Past Inner Seals.Caused by Defective Gasket.Strongback Installed & Gasket Replaced

/03L-0:on 800708,during Leak Test on Equipment Hatch Escape Lock,Air Leaked Past Inner Seals.Caused by Defective Gasket.Strongback Installed & Gasket Replaced

ML19330C442
Person / Time
Site:	North Anna
Issue date:	08/04/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19330C438	List: 05000338/LER-1980-062, Forwards LER 80-062/03L-0 05000338/LER-1980-062-03, /03L-0:on 800708,during Leak Test on Equipment Hatch Escape Lock,Air Leaked Past Inner Seals.Caused by Defective Gasket.Strongback Installed & Gasket Replaced
References
LER-80-062-03L, LER-80-62-3L, NUDOCS 8008080386
Download: ML19330C442 (2)

LER-1980-062, /03L-0:on 800708,during Leak Test on Equipment Hatch Escape Lock,Air Leaked Past Inner Seals.Caused by Defective Gasket.Strongback Installed & Gasket Replaced

Event date:
Report date:
3381980062R03 - NRC Website

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U.S. NUCLEAR REGULATORY COMMISSION J

LICENSEE EVENT REPORT I

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DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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On July 8, 1980, with the unit in Mode 1, while performing a leak test on the /

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equipment hatch escape lock, it was determined that air leaked past the escape /

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hatch inner door seals. Air did not leak past the escape hatch outer door

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seals and the health and safety of the general public were not affected. This /

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is contrary to T.S. 3.6.1.3 and reportable pursuant to T.S. 6.9.1.9.b.

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SYSTEM

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SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO.

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. CONPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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The cause of air leakage upon testing appeared to be a defective gasket. The /

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gas'ket was replaced and the hatch was retested but air continued to flow past /

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the seals. A strongback was installed on the door and the door was retested

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satisfactorily. Maintanence on the sealing surfaces of the hatch door will be /

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completed during the next outage.

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FACILITY METHOD OF STATUS

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ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

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PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

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LOSS OF OR DAMAGE TO FACILITY (43)

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 4 0 o gans 39

g Virginia Electric and Power Company North Anna Power Station, Unit 1

Attachment:

Page 1 of I Docker No. 50-338 Report No. 80-062/03L-0 Attachment to LER 80-062/03L-0 Dgscription of Event On July 8, 1980, with unit in mode 1, the equipment hatch escape lock inner door leaked while being air pressure tested. This is contrary to T.S. 3.6.1.3 and reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence The equipment hatch escape lock has an inner door as well as an outer door to maintain containment integrity with outside air. The outer hatch door seals were verified, by testing, to be satisfactory which sssured the integrity of the containment. The inner hatch door was forced against its seals using a strongback and it was tested satis-factorily within the time period required by the action statement.

Therefore, the health and safety of the general public were not affected.

Cause of Event

4 The equipment hatch escape lock failed the air pressure leak test due' to deterioration of inner door seal and mating surfaces.

Immediate Corrective Action

'Upon determination that the hatch leaked air, the seal on the inner door was removed and a used gasket in good condition was obtained from

,Surry Power Station and installed on the inner door.

The hatch was retested and failed due to air leakage. A strongback, approved by the station safety committee, was installed on the inner door and the hatch was retested satisfactorily.

Scheduled Corrective Action The sealing problem with the inner door will be investigated and corrected the next time containment vacuum is broken. After each opening of the hatch, the periodic surveillance test 1-PT-62.3, shall be performed.

Actions Taken to Prevent Reccurrence No further ect2.: 11 are required.

Gene _rje Implications There are no generic implications.