05000270/LER-1981-019, Forwards LER 81-019/01T-0.Detailed Event Analysis Encl

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Forwards LER 81-019/01T-0.Detailed Event Analysis Encl
ML20069B550
Person / Time
Site: Oconee Duke Energy icon.png
Issue date: 12/08/1981
From: Parker W
DUKE POWER CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20069B553 List:
References
NUDOCS 8112240250
Download: ML20069B550 (2)


LER-2081-019, Forwards LER 81-019/01T-0.Detailed Event Analysis Encl
Event date:
Report date:
2702081019R00 - NRC Website

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Mr. James P. O'Reilly, Director

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Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia,30303 Re: Oconee Nuclear Station Docket No. 50-270~

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Dear Mr. O'Rielly:

Please find attached Reportable Occurrence Report R0-270/81-22. This report is submitted pursuant to Oconee Nuclear Station Technical Specification 6.6.2.1.a(2), which concerns an operation subject to a-limiting condition for operation which was less conservative than the. least conservative aspect of the limiting condition for operation established in the Technical Specifica-tions, 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. The cause of this occurrence is currently under investigation and will be provided in a -

revision to this report by December 22, 1981.

Very truly yours, b hp .s h 'h i  ; William O. Parker, Jr. g

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-e DUKE POWER COMPAhT OCONEE UNITS 2 AND 3 Report Number: R0-270/81-19 Report Date: December 8, 1981 10ccurrence Date: November 24, 1981 Facility: Oconee Units 2 and 3, Seneca, South Carolina Identification of Occurrence: Loss of Fire Suppression System on CT-5 Transformer Conditions Prior to Occurrence: Oconee 2 75% FP Oconee 3 100% FP Description of Occurrence: On November 24, 1981, Construction personnel severed a two-inch line which branched off the water header supplying the CT-5 transformer fire suppression system. To stop the leak, valve IIPSW-27 was shut, isolatingJthe sprinkler system for the CT-5 transformer. A fire watch and backup fire' suppression equipment were not provided within one hour as required by Technical Specification 3.17.3.1.

Apparent Cause of Occurrence: The cause of this occurrence is corrently under investigation and will be provided in a revision to this report by December ??. 1981.

Analysis of Occurrence: Transformer CT-5 provides power source redundancy for the .

on-site power sources. It is only required to be operable during extended outages of one Keowee unit or simultaneous outages cf both Keowee units. Additionally, the loss of the fire suppression system'does not affect the transformer operability; thus, it is considered that the health and safety of the .public were not af fected by this event.

Corrective Action: Oconee 2 and 3 commenced shutdowns. A backup water supply and irewatches were established, and the unit shutdowns were secured. The leak

. was repaired and the fire suppression system returned to service.

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