05000369/LER-1981-063, Forwards LER 81-063/03L-0

Forwards LER 81-063/03L-0

ML20005A043
Person / Time
Site:	McGuire
Issue date:	05/21/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20005A044	List: 05000369/LER-1981-063, Forwards LER 81-063/03L-0 05000369/LER-1981-063-03, /03L-0:on 810422,outer Door of Lower Personnel Air Lock Closed,But Locking Pins Stuck & Seals Failed to Inflate.Caused by Missing Shear Pin on Limit Switch Actuating Shaft.Pin Replaced & Door Declared Operable
References
NUDOCS 8106290288
Download: ML20005A043 (2)

LER-1981-063, Forwards LER 81-063/03L-0

Event date:
Report date:
3691981063R00 - NRC Website

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May 21, 1981 2 7 2..e. 2 Mr. James P. O'Reilly, Director U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Re: McGuire Nuclear Station Unit 1 Docket No. 50-369

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/81-63.

This report concerns the outer door of the lower personnel air lock being declared in-operable. This incident was considered to be of no significance with respect to the health and safety of the public.

Very truly yours, LUlkL OSL,b g

William O. Parker, Jr.

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RWO:pw Attachment ec: Director Mr. Bill Lavallee 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 Ms. M. J. Graham Resident Inspector - Nr.C 8

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McGUIRE NUCLEAR STATION INCIDENT REPORT Report Number: 81-63 Report Date: May 7, 1981 Occurrence Dates April 22, 1981 Facility: McGuire Unit 1, Cornelius, N. C.

Identification of Occurrence: The outer door of the lower personnel air lock was declared inoperable.

Condition Prior to Occurrence: Mode 3, Hot Standby Description of Occurrence:

The outer door of the lower personnel air lock closed; however, the locking pins vould not move and the seals wouldnot in-flate. The door was declared inoperable at 0750 hours0.00868 days <br />0.208 hours <br />0.00124 weeks <br />2.85375e-4 months <br /> on Apr13 22,.1981.

This placed the plant in a degraded mode of operation pursuant to Technical Specification 3.6.1.3.

Apparent Cause of Occurrence:

It was discovered that a shear pin which holds the limit switch actuating shaft in place was missing.

This prevented the limit switch from being actuated, and therefore prevented the seals from in-flating and sealing the door.

- nalysis of Occurrence: On April 22, 1981 at 0750 hours0.00868 days <br />0.208 hours <br />0.00124 weeks <br />2.85375e-4 months <br />, the outder door of

'the lower personnel air lock was declared inoperable.

It closed; however, it would not lock in place or seal.

The Control Room was notified and the door was declared inoperable.

It was determined that a shear pin was missing which prevented the limit switch from operating properly. The pin was re-placed and the door was returned to an operable status at 0938 hours0.0109 days <br />0.261 hours <br />0.00155 weeks <br />3.56909e-4 months <br /> on April 22, 1981.

Corrective Action

The shear pin in the limit switch mechanism was replaced.

No further problems are anticipated.

Safety Analysis

The safety of the plant was not degraded by this event. The inner door of the lower personnel air lock remained closed while the outer door was inoperable.

Containment integrity remained intact.