05000287/LER-1981-008, Forwards LER 81-008/03L-0.Detailed Event Analysis Encl

Forwards LER 81-008/03L-0.Detailed Event Analysis Encl

ML20030C090
Person / Time
Site:	Oconee
Issue date:	05/22/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20030C091	List: 05000287/LER-1981-008, Forwards LER 81-008/03L-0.Detailed Event Analysis Encl 05000287/LER-1981-008-03, /03L-0:on 810422,during Seismic Block Wall Insp, Discovered Breach of Fire Barrier in Penetration 3-T-T-1. Caused by Pulling of Electrical Cables Through Barrier. Breach Repaired Using RTV Foam
References
NUDOCS 8108250385
Download: ML20030C090 (2)

LER-1981-008, Forwards LER 81-008/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2871981008R00 - NRC Website

text

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WILLI A M O. PAR M CR. J R.

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273-4o 2 May 22, 1981 sec. P.cowcwo-Mr. James P. O'Reilly', Director U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Re:

Oconee Nuclear Station Docket No. 50-287

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-287/81-08. This report is submitted pursuant to Oconee Nuclear Station Technical Specification 6.6.2.1.b(2), which concerns operation in a degraded mode permitted by a limiting condition for operation, and describes an incident which is con ered to be of no significance with respect to its effect on the health an4 g. f4Y L

the public.

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- - -Very truly yours, sa ou

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,y William O. Parker, Jr.

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g g(f '< 7 JLJ:pw Attachment ec: 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, California 94303 e

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DUKE POWER COMPANY OCONEE UNIT 3 Report Number:

R0-287/81-08 Report Date:

May 22, 1981 Occurrence Date: April 22, 1981 Facility:

Oconee Unit 3, Seneca, South Carolina Identification of Occurrence:

Breach of Fire Barrier Between Turbine Building and Ventilation and Equipment Room.

Conditions Prior to Occurrence:

100% FP Description of Occurrence: At approximately 0950 hours0.011 days <br />0.264 hours <br />0.00157 weeks <br />3.61475e-4 months <br /> on April 22, 1981, during a seismic block wall inspection, a breach of the fire barriar between the Unit 3 Turbine Building and the Ventilation and Equipment Room in penetration 3-T-T-1 was discovered.

The breach measured 10" deep, with a 2" opening at one end and increasing to a 6" opening at the other. A fire watch was established at approxi-mately 1000.

This constitutes operation in a degraded mode per Technical Speci-fication 3.17.5 and is thus reportable pursuant to Technical Specification 6.6.2.1.b(2).

Apparent Cause of Cccurrence:

The cause of the breach was due to the pulling of electrical cables through the barrier to supply the Unit 3 Turbine Building Officit Analysis of Occurrence:

The breaching of this fire barrier. could have possibly allowed the spreading of fire from the turbine building to the ventilation and equipment room.

The void was of significant size to allow flames and/or smoke to pass through the barrier.

Because of the low combustibility of materials in the area, there was not an immediate danger to safety related or any other equip-ment.

After the discovery of the breach the required fire watch was maintained until the breach was repaired.

Hence the health and safety of the public was not endangered.

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Corrective Action

A fire watch was established until the breach was repaired

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as required.

The breach was repaired using RTV foam.

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