ML20039D010

Forwards Updated LER 81-019/01T-1.Detailed Event Analysis Encl

ML20039D010
Person / Time
Site:	Oconee
Issue date:	12/21/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20039D011	List: ML20039D010 ML20039D014
References
NUDOCS 8112310211
Download: ML20039D010 (2)

Text

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e' O DUKE POWER' COMPAN f CION **

C Powna Dun. nmo 4 422 Sourn Cucacn Starzr. CHARLOTTE, C.28242 o

EC 28 a y 5a WI LLI AM C. PARMER, J R, VICE PnESIDENT TELEP**0'ut: An E4 70',

set. P ooucwo" December 21, 1981- 273-do 8 3 to O A Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission

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.101 Marietta Street, Suite 3100  ;

!'kCg 0 799fs {i Atlanta, Georgia 30303 ( _

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.Re: Oconee Nuclear Station Docket No. 50-270 \y . /

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Dear Mr.:

0'Reilly:

Please find attached Reportable Occ 'rence Report R0-270/81-19, Revision 1,-

which provides the cause description and additional corrective action to the original submittal. 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 Specifications, 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, s

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ma. Q William O. Parker, J JFK/php

/P,tachment cc: Director Records Center Office of Management & Program Analysis . Institute of Nuclear Power Operations U. S. Nuclear Regulatory Commission 1820 Water Place Washington, D. C. 20555 Atlanta, Georgia 30339 Mr. W. T. Orders NRC Resident Inspector Oconee Nuclear Station

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8112310211 81122170 PDR ADOCK 05 7- J f-s

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4 DUKE POWER COMPANY OCONEE UNITS 2 AND 3 Report Number: R0-270/81-19 Report Date: December 2h 1981 Occurrence 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 trans-former fire suppression system. To stop the leak, valve HPSW-27 was shut, isolating the 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 incident was failure to initiate action to establish a continuous fire watch and backup fire protection system within one hour of closing valve HPSW-27.

Analysis of Occurrence: Transformer CT-5 provides power source redundancy for the onsite power sources. It is only required to be operable during extended outages of one Keowee unit or simultaneous outages of both Keowee units. Addi-tionally, 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 affected by this event.

Corrective Action: Oconee 2 and 3 commenced shutdowns. A backup water supply and firewatches were established, and the unit shutdowns were secured, The leak was repaired and the fire suppression system returned to service. Personnel involved in this event were counselled concerning actions taken during this event.

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