ML19261D626

RO 50-219/79-20-1P on 790613:second Containment Integrity Was Not Maintained for 11 Minutes.Caused by Simultaneous Opening of Both Reactor Bldg Railroad Doors.Door Components Repaired

ML19261D626
Person / Time
Site:	Oyster Creek
Issue date:	06/14/1979
From:	Mcnair R JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19261D625	List: ML19261D624 ML19261D626
References
NUDOCS 7906200396
Download: ML19261D626 (2)

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Initial Telephone Date of Report Date: June 13, 1979 Occurrence: June 13, 1979 Initial Written Time of Report Date: June .1, 1979 Occurrence: 1039 hours0.012 days <br />0.289 hours <br />0.00172 weeks <br />3.953395e-4 months <br /> OYSTER CREEK NUCLEAR GENERATING STATION FORKED RIVER, NEW JERSEY 08731 Reportable Occurrence Report No. 50-219/79/20-lP IDENTIFICATION Violation of the Technical Specifications, paragraph 3.5.B.1, 0F OCCURRENCE: when secondary containment integrity was not maintained for eleven minutes when both reactor building railroad airlock doors were open.

This event is considered to be a reportable occurrence as defined in the Technical Specifications, paragraph 6.9.2. A.2. and 6.9.2. A.6.

CONDITIONS PRIOR X Steady State Power Routine Shutdown TO OCCURRENCE: Hot Standby Operation Cold Shutdown Load Changes During Refueling Shutdown Routine Power O Routine Startup Other (Specify)peration Operation Flow: Recirculating 14.4 x 104 gpm Feedwater 6.98 x 10 #/hr.

Power: Generator 643 MWe Reactor 1870.2 MWt Stack Gas: 3.36 x 104 pC1/sec.

DESCRIPTION On Wednesday, June 13, 1979, at approximately 1039 hours0.012 days <br />0.289 hours <br />0.00172 weeks <br />3.953395e-4 months <br />, the OF OCCURRENCE: secondary containment integrity was breached when both reactor building railroad airlock doors were open simultaneously. The inner railroad airlock door was open and the outer door was in the close position several days prior to the incident. The outer door swung open when normal reactor building ventilation system was switched to the standby gas treatment system in order to repair the dampers on the reactor building supply fans.SF-1-13 and SF-1-14. At 1040, the Control Room Operators were preparing for an orderly shutdown while investigating the cause for loss of secondary containment. The shutdown was terminated at 1052 when -

the inner airlock door was secured in the close position. The reactor building ventilation was restored to normal operation at 1107 hours0.0128 days <br />0.308 hours <br />0.00183 weeks <br />4.212135e-4 months <br /> and standby gas treatment was secured.

2286 209 j 790 6200 h 6 f f i

Reportable Occurrence Page 2 Report No. 50-219/79/20-1P APPARENT CAUSE Design X Procedure OF OCCURRENCE: Manufacture Unusual Service Condition Installation / Inc. Environmental Construction Component Failure Operator Other (Specify)

The procedure for operating the reactor building railroad airlock doors was inadequate. The procedure fails to state the correct method in which the railroad airlock doors are to be secured.

Personnel operating the doors failed to secure the upper mechanism on the outer door.

ANALYSIS OF Secondary containment is required to minimize ground level OCCURRENCE: release of airborne radioactive materials, and to provide for controlled, elevated release of the building atmosphere under accident conditions. The ability of secondary containmenc to perform its function with both airlock doors open was degraded.

Considering the length of time concerned, the safety significance of this event is considered to be minimal.

CORRECTIVE Door components damaged during the incident were repaired and ACTION: a secondary leak rate test was performed to check the integrity of the secondary containment.

FAILURE DATA: N/A Prepared by: E 9M ^~~vvA b e. Date: June 14, 1979 R. C. McNair i

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