05000287/LER-1980-016, Forwards LER 80-016/03L-1.Detailed Event Analysis Encl

Forwards LER 80-016/03L-1.Detailed Event Analysis Encl

ML20009C095
Person / Time
Site:	Oconee
Issue date:	02/19/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009C097	List: 05000287/LER-1980-016, Forwards LER 80-016/03L-1.Detailed Event Analysis Encl 05000287/LER-1980-016-03, /03L-1:on 801123,fire Detectors String B-2 Went Into Alarm Condition.Caused by Dust Buildup in Detector. Detector Cleaned & Verified Operable
References
NUDOCS 8107200282
Download: ML20009C095 (2)

LER-1980-016, Forwards LER 80-016/03L-1.Detailed Event Analysis Encl

Event date:
Report date:
2871980016R00 - NRC Website

text

/f DUKE POWER COhiPANY.

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Powen Buttotxo 422 SouTu Cnuscu STREET, CHAH14TTE, N. C. saa4a I f~9 i

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TELEP=ONCI ANC A 704 sec.- e.oovet o February 19, 1981 3 7 3-4 c 8 3 10-o92-634' Mr. James P. O'Reilly, Director g

U. S. Nuclear Regulatory Commission f yy 05, ' $ g*

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101 Marietta Street, Suite 3100

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JUL 2 i 7937, Atlanta, Georgia 30303 g-u.s. NucuAa arcturon 4

"'55 cN Re: Oconee Nuclear Station Docket No. 50-287 D.

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Dear Mr. O'Reilly:

Please find attached Revision 1 of Repor,*.able Occurrence Report R0-287/80-16,

" Fire Detector String B-2 Removed From Service", originally submitted December 23, 1980.

This report is being resubmitted in order to correct the " Corrective Actions" section of the initial report. 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 considered to be of no significance with respect to its effect on the health and safety of the public.

Ve truly yours, w d.

WilliamO. Parker,Jr.6 i

l JLJ:pw l

Attachment cc:

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

20555 Palo Alto, California 94303 l

l 1

ff'Q 8107200282 810219 OWICIAL CO[1 I'

PDR ADOCK 05000287 S

PDR

DUKE PO'JER COMPANY OCONEE UNIT 3 Report Number _: R0-287/80-16 Report Date: February 19, 1981 Occurrence Date: November 23, 1980 Facility: Oconee Unit 3, Seneca, South Csrolina Identification of Occur,.rence: Fire Detector String B-2 Removed From Service Conditions Prior to Occurrence: Oconee 3 99% FP Deccription of Occurrence: At approxitately 1115 hours0.0129 days <br />0.31 hours <br />0.00184 weeks <br />4.242575e-4 months <br /> on November 23, 1980, the fire detection string B-2 went into an alarm condition. A subsequent in-vestigation revealed that no fires were present. The string was ther. de-clared inoperable, and a fire natch was established over the affected area.

The string was declared operable at 1245 the same day. This constitutes operation in a degraded mode per Technical Specification 3.17.1 and is thus reportable pursuant to Technical Specification 6.6.2.1.b(2).

Apparent Caene of Occurrence: This incident was the result of dust build up in the detector, which was caused by the large amount of construction activity at the site. This is a recurring problem with the detectors. There is no easy solution as long as the construction continues.

Analysis of Occurrence: The fire detection string was only out of service for l-1/2 hours. During this short period of inoperability, a fire watch for the affected area was maintained as required by Technical Specification 3.17.1.

Thus, this incident was of no significance with respect to saft operation, and l

the health and safety of the public were not affected.

l l

Corrective Action

The detector war cleaned and verified operable before re-l turning to service. All accessible fire detectors in the areas of roll up doors or other areas susceptible to dusty conditions will be cleaned on an in-creased frequency to remove dust buildup.