05000269/LER-1981-009, Forwards LER 81-009/03L-0.Detailed Analysis Encl

Forwards LER 81-009/03L-0.Detailed Analysis Encl

ML20009G464
Person / Time
Site:	Oconee
Issue date:	07/22/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009G465	List: 05000269/LER-1981-009, Forwards LER 81-009/03L-0.Detailed Analysis Encl 05000269/LER-1981-009-03, /03L-0:on 810622,during Normal Operations,Startup Transformer CT-1 Locked Out.Cause Not stated.CT-1 Transformer & Bus Work Checked & Protective Relaying Checked for Malfunction Prior to Return to Svc
References
NUDOCS 8108040288
Download: ML20009G464 (2)

LER-1981-009, Forwards LER 81-009/03L-0.Detailed Analysis Encl

Event date:
Report date:
2691981009R00 - NRC Website

text

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July 22, 1981 373 4o.3 Mr. James P. O'Reilly, Director

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Re: Oconee Nuclear Station s

Docket No. 50-269 W-q nu \\

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Dear Mr. O'Reilly:

t Please find attached Reportable Occurrence Report R0-269/81-9.

This report is submitted purauant 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.

I Ve truly yours,

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'k'illiam O. Parker, Jr.

Q JLJ:eck Attachment cc:

Director Mr. Bill Lavallee l

Office of Management & Prograut Analysis Nuclear Safety Analysis Center l

U. S. Nuclear Regulatory Commission P. O. Box 10412 Washington, D. C. 20555 Palo Alto, California 94303 i

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8108040288 810722 PDRADOCK05000g S

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DUKE POWER COMPANY OCONEE UNIT 1 Report Number:

R0-269/81-9 Report Date: July 22, 1981 Occurrence Date:

June 22, 1981 Facility: Oconee Unit 1, Seneca, South Carolina Identification of Occurrenca:

Startup Transformer CT-1 Locked Out Conditions Prior to Occurrence: 90% FP Description of Occurrence:

At 1322 hours0.0153 days <br />0.367 hours <br />0.00219 weeks <br />5.03021e-4 months <br /> on June 22, 1981, startup transformer CT-1 locked out for unknown reasons.

This constitutes operation in a degraded mode per Technical Specification 3.7.2(a) and is thus reportable pursuant to Technical Specification 6.6.2.1.b(2).

Apparent Cause of Occurrence: The reason for this incident is not exactly known.

There is speculation that a bird or some other object could have entered the broken inspection glass on the 6900 volt disconnect switch causing a V $ differential trip.

1 Analysis of Occurrence:

During the time period that CT-1 was locked out, back-4 1

up power was verified available from Keowee-l.

Thus, the health and safety of l

the public were not affected by this incident.

1

Corrective Action

The CT-1 transformer and buss work were checked for faults, and the protective relaying was checked for malfunction prior to returning control to Operations.

A more complete check will be performed on the CT-1 transformer and switchgear during the current Unit i refueling outage.

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