05000369/LER-1981-075, Forwards LER 81-075/03L-0.Detailed Event Analysis Encl

Forwards LER 81-075/03L-0.Detailed Event Analysis Encl

ML20009G208
Person / Time
Site:	McGuire
Issue date:	05/29/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009G209	List: 05000369/LER-1981-075, Forwards LER 81-075/03L-0.Detailed Event Analysis Encl 05000369/LER-1981-075-03, /03L-0:on 810501,during Routine Surveillance, Broken Motor Mounts Discovered on Control Room Outside Air Filter Makeup Fan.Caused by Metal Fatigue.Mounts Repaired & Sys Returned to Operability
References
NUDOCS 8108030429
Download: ML20009G208 (2)

LER-1981-075, Forwards LER 81-075/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3691981075R00 - NRC Website

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Docket No. 50-369

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/81-75. This report concerns the Control Room Outside Air Filter Makeup Fan 1A 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, William O. Parker, Jr.

RWO:pw Attachment cc:

Director Mr. Bill Lavallee Office of Management & Program Analysis Nuclear Safety Analysis Center U.S. Nuclear Regulatory Commission P. O. Box 10412 Washington, D. C.

20555 Palo Alto, CA 94303 M2 M. J. Graham Resident Inspector - NRC McGuire Nuclear Station SrIf i

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.4 McGUIRE NUCLEAR STATION INCIDENT REPORT Report Number:

81-75 Report Date: May 31, 1981 Occurrence Date:

May 1, 1981 Facility: McGuire Unit 1, Cornelius, N. C.

Identification of Occurrence:

The Control Room Outside Air Filter Makeup Fan 1A was declared inoperable.

Condition Prior to Occurrence: Mode 5 Description of Occurrence: On May 1, 1981-at 0125 hours0.00145 days <br />0.0347 hours <br />2.066799e-4 weeks <br />4.75625e-5 months <br /> the Control Room Out-side Air Filter Makeup Fan 1A was declared inoperable.

Broken motor mounts were discovered in the course of routine surveillance.

This incident was reportable pursuant to Technical Specification 3.7.6.

A work request was written, the motor mounts were repaired and the fans were returned to service on May 7, 1981 at 1509 hours0.0175 days <br />0.419 hours <br />0.0025 weeks <br />5.741745e-4 months <br />.

Appyrent Cause of Occurrence:

The fan motor mounts failed'due to metal fatigue.

Thi. is believed to be ar isolated occurrence, since no other similar failures have been reported.

Analysis of Occurrence:

There are two,100% capacity fans which provide outside air for the Control Room. TrainBreyainedoperableduringtheentiretimethat the Train A was out of service.

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Corrective Action

A work request was written to repair the motor mounts.

The system was returned to an oparable status at 1509 hours0.0175 days <br />0.419 hours <br />0.0025 weeks <br />5.741745e-4 months <br /> on May 7, 1981.

Safety Analysis

The health and safety of the public were not affected by this incident.

The redundant Train B air fan was operable while Train A was out of service.

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