ML20009G208

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)

Text

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• 40 WILLI AM O. PA R K E R, ,J R.

Vocr PmEsscE*.* TELE *MONE: AREA 704 svEu. Paooveno- May 29, 1981 37s-4o83 Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II  ?

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s ge i L LJ Y f 101 Marietta Street, Suite 3100 9y U'gg y.D Atlanta, Georgia 30303 jul Ps , Q Re: McGuire Nuclear Station Unit 1 b':\ u.5.d' ds Docket No. 50-369 /

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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 e108030429 810529 PDR ADOCK 05000369 S PDR A

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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 r

the Train A was out of service.

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r 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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