05000287/LER-1981-013, Forwards LER 81-013/03L-0.Detailed Event Analysis Encl

Forwards LER 81-013/03L-0.Detailed Event Analysis Encl

ML20009G078
Person / Time
Site:	Oconee
Issue date:	06/26/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009G079	List: 05000287/LER-1981-013, Forwards LER 81-013/03L-0.Detailed Event Analysis Encl 05000287/LER-1981-013-03, /03L-0:on 810528,1-inch Breach Discovered in 3-h Fire Barrier in Floor of Control Room Outside Shift Supervisor Ofc.Cause Undefined Due to Breach Being Covered Since Const of Control Room
References
NUDOCS 8108030308
Download: ML20009G078 (2)

LER-1981-013, Forwards LER 81-013/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2871981013R00 - NRC Website

text

e DUKE POWER COMPANY PE/CfjQ PowEn Drit. naso 422 SocTri Cnuncu STHEET, CIMat.OTTE, N. C. 28242 Cb[37 t

l w e t.LI AM O. PA R M E R, J R.

Act PmC$eDFNt frLEpmont; ARE A 704 sir.- P mcwo~

June 26, 1981 373-4o s 2 l

Mr. James P. O' Reilly, Director 1 ) ! ?>f f' %Y U. S. Nuclear Regulatory Commission Region II ny p, ( ]g. ['s Q 101 Marietta Street, Suite 3100 Q

,.,J gA Atlanta, Georgia 30303 l

i.i J U L '! 119815 d Re: Oconee Nuclear Station Docket No. 50-287 A

u.s. mcura ncturca -

p-co,wiss os v[%

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Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Raport R0-287/8141.bg%1s report is submitted pursuant to Oconee Nuc? ear Station Technical Specification 6.6.2.1.b(2),

which concerns eneration

.n a d% raded mode permitted by a limiting condition for operation, and describes an incident which is considered to be of no significance with respect co its effect on the health and safety of the public.

Very truly yours, FL 0 P William O. Parker, Jr.

d4/dk JLJ: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 i

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8108030308 810626 PDR ADOCK 05000287 S

PDR

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DUKE POWER COMPANY i

OCONEE UNIT 3 Report Nurhar:

R0-287/81-13 Report Date: June 26, 1981 Occurrence Date:

May 23, 1981 4

i Facility: Oconee Unit 3, Seneca, South Carolina l

Identification of Occurrence:

Breaching of Fire Barrier in Unit 3 j

Control Room Conditions Prior to occurrence:

100% FP i

Description of Occurrence: At 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on May 28, 1981, a 1-inch breach in a 3-hour fire barrier was discovered in the floor of the Unit 3 Control Room just

{

outside of the Shift Supervisor's office.

The void had been covered by carpet

]

since initial construction and was found while replacing the carpet.

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

Apparent Cause of Occurrence: The cause of this incident cannot be clearly de-fined because the breach had been covered since construction of the Unit 3 Con-j trol Room.

Analysis of Occurrence: Due to the low combustibility of materials, the small size of the breach, and the smoke detectors located on both sides of the breach, the possibility of a fire spreading was very low.

Additionally, the Control l

Room is continuously manned.

Therefore, this incident was of no significance l

with respect to safe operation, and the health and safety of the public were not l

affected.

i

Corrective Action

Ine tepair of this breach was performed by Mechanical Maintenance technicians using the troubleshooting procedure MP/0/A/1800/22.

The l

breach was a threaded pipe sleeve.

The threads were chased with a 1-inch pipe i

die to clean them.

Two 1-inch pipe plugs were then installed to seal the l

barrier. The penetration has been assigned the number 3-C-F-158 and will be placed on inspection procedure MP/0/A/3020/05.

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