05000369/LER-1981-056, Forwards LER 81-056/03L-0.Detailed Event Analysis Encl

Forwards LER 81-056/03L-0.Detailed Event Analysis Encl

ML20009C276
Person / Time
Site:	McGuire
Issue date:	05/15/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009C277	List: 05000369/LER-1981-056, Forwards LER 81-056/03L-0.Detailed Event Analysis Encl 05000369/LER-1981-056-03, /03L-0:on 810417,while in Mode 3,inner Door of Lower Personnel Air Lock Would Not Close Completely.Cause Undetermined.Door Cycled & Found to Be Functioning Properly
References
NUDOCS 8107200427
Download: ML20009C276 (2)

LER-1981-056, Forwards LER 81-056/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3691981056R00 - NRC Website

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373-4083 Se came PnOOvCTt0N Mr. J. P. O'Reilly, Director m

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Re: McGuire Nuclear Station Unit 1 Docket No. 50-369 3

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Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/81-56. This report concerns the inner door of the lower personnel air lock being declared inoperable. This incident was considered to be of no significance with respect to the health and safety of the public.

Ve truly yours,

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William O. Parker, Jr.

RWO/dj s Attachment ec: Director Mr. Bill Lavalee Office of Management and Program Analysis Nuclear Safety Analysis Center U. S. Nuclear Regulatory Commission Post Office Box 10412 Washington, D. C.

20555 Palo Alto, California 94303 t

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7 McGUIRE NUCLEAR STATION INCIDENT REPORT REPORT NUMBER: 81-56 REPORT DATE: May 5, 1981 OCCURRENCE DATE: April 17, 1981 FACILITY: McGuire Unit 1, Cornelius, N.C.

IDENTIFICATION OF OCCURRENCE: The inner door of the lower personnel air lock was declared inoperable.

CONDITION PRIOR TO OCCURRENCE: Mode 3, Hot Standby DESCRIPTION OF OCCURRENCE: The inner door of the lower personnel air lock would not close completely. The door was declared inoperable at 1730 hours0.02 days <br />0.481 hours <br />0.00286 weeks <br />6.58265e-4 months <br /> on April 17, 1981. This placed the plant in a degraded mode of operation pursuant to Technical Specification 3.6.1.3.

APPARENT CAUSE OF OCCURRENCE: The apparent cause could not be determined.

Personnel were sent to investigate the inoperable door.

It was cycled several times, and found to be working properly.

ANALYSIS OF OCCURRENCE: Personnel were stationed at the lower personnel air lock to restrict entry into containment. This was part of the program to prolong seal life.

It was discovered that the inner door would not close completely. The Control Room was notified, and the door was declared inoperable. Maintenance was sent to investigate the problem. They found that the door was operable.

It was cycled several ti.aes and declared operable again at 2330 hours0.027 days <br />0.647 hours <br />0.00385 weeks <br />8.86565e-4 months <br /> on April 17, 1981.

CORRECTIVE ACTION

No corrective action was necessary. The door was working properly when maintenance investigated. Personnel were alerted to watch for similar problems in the future.

SAFETY ANALYSIS

The safety of the plant was not degraded by this event.

The outer door of the lower personnel air lock remained closed while the inner door was inoperable. Therefore, containment integrity was maintained and the health and safety of the public were not affected.