05000219/LER-1981-022-01, /01T-0:on 810520,secondary Containment Integrity Not Maintained Due to Personnel Access Airlock Doors Ajar. Caused by Personnel Error & Loosened Striker Plate on Inside Door.Outside Door Closed & Striker Plate Repaired

/01T-0:on 810520,secondary Containment Integrity Not Maintained Due to Personnel Access Airlock Doors Ajar. Caused by Personnel Error & Loosened Striker Plate on Inside Door.Outside Door Closed & Striker Plate Repaired

ML20004D755
Person / Time
Site:	Oyster Creek
Issue date:	06/03/1981
From:	Fitzgerald M JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20004D753	List: 05000219/LER-1981-022, Forwards LER 81-022/01T-0 05000219/LER-1981-022-01, /01T-0:on 810520,secondary Containment Integrity Not Maintained Due to Personnel Access Airlock Doors Ajar. Caused by Personnel Error & Loosened Striker Plate on Inside Door.Outside Door Closed & Striker Plate Repaired
References
LER-81-022-01T, LER-81-22-1T, NUDOCS 8106090731
Download: ML20004D755 (3)

LER-1981-022, /01T-0:on 810520,secondary Containment Integrity Not Maintained Due to Personnel Access Airlock Doors Ajar. Caused by Personnel Error & Loosened Striker Plate on Inside Door.Outside Door Closed & Striker Plate Repaired

Event date:
Report date:
2191981022R01 - NRC Website

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OYSTER CREEK NIX 1 EAR GENERATING STATICN Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/81-22/01T Report Date June 3, 1981 Occurrence Date i

May 20, 1981 l

Identification of Occurrence A violation of Technical Specifications, paragraph 3.5.B.1 occurral when secondary contaht integrity was not maintainal at all times. Both personnel access airlock doors en the Northwest side of the Peactor 9141 ding were found ajar.

'Ihis event is considered to be a reportable occurrence as defined in the Technical Specifications, paragraph 6.9.2.a.6.

conditions Prior to Occurrence The plant was shutdown in the REEUEL Itode with reactor tatperature less than 2120F.

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yescription of Occurrence At approximately 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> on May 20, the offgoing drywell Security Guard discovered both the inside and outside (NW corner, 23' elevation) Reactor Building personnel access airlock doors ajar. In this configuration the door interlock systen prevents either door frcm closing. The Group Shift Supervisor was imadintely notified and the problem was corrected by bypassing the inter-lock systen and closing the doors. The doors had been checked earlier on the 4-12 shift and were found closed. It is postulated that when the inside door failed to close due to a loosened striker plate, the outside door was opened using the installed interlock bypass systen by persons unknown. Once both doors were open the interlock prevented them frcxn closing.

Apparent cause of Occurrence The cause of the occurrence was attributed to personnel error. Although the 3

inside door failed to close due to a' loosened striker plate, the interlock protecting the 'seccnd door frcm opening had to be deliberately bypassed.

Analysis of Occurrence Secondary containment is designed to minurize any ground release of radioactive materials which might result frcxn a serious accident. 'Ihe Beactor Building provides secondary containment during reactor operation when the drywell is sealed and in service and provides prirrary containment when the reactor is shutdown and the drywell is open.

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Reportable Occurrence Page 2 Report No. 50-219/81-22/0lT Mien this event occurred, all of the requiremnts of the Technical Specifications

. paragrapt 3.5.B.1, except for the reactor mode switch position, were met for conditions which do not require secondary containment integrity. 'Ihe reactor mode switch was in "REEUEL", whereas the Technical Specifications required "SifrIDCm" if secondary containment integrity is not maintained. In strmary, the major functional requirenents were met for conditions not requiring secondary containment integrity.

Corrective Action

The offgoing Security Guard inmiiately notified the Group Shift Supervisor, who closed the outside door by manually overriding the interlock mechanism. Within several minutes Mechanical Maintenance personnel repaired the loosened striker plate on tra inner door and the doors were returned to service. Currently, as

~ part of the General Enployee Training, the proper operation of personnel airlock doors is addressed. The secondary containment airlock doors and interlock mechanism will be added to the P.M. schedule to reduce the possibility of door malfunctions which may result in individuals bypassing the interlock.

Failure Data Not Applicable.

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