05000269/LER-1982-007, Forwards LER 82-007/01T-0.Detailed Event Analysis Encl

Forwards LER 82-007/01T-0.Detailed Event Analysis Encl

ML20054L863
Person / Time
Site:	Oconee
Issue date:	06/30/1982
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20054L864	List: 05000269/LER-1982-007, Forwards LER 82-007/01T-0.Detailed Event Analysis Encl 05000269/LER-1982-007-01, /01T-0:on 820616,during Periodic Environ Surveillance,Keowee Hydro Station Water Fire Suppression Sys Declared Inoperable Due to Inability to Obtain Flow from Fire Hydrant.Caused by Clogged Inlet Strainer
References
NUDOCS 8207090017
Download: ML20054L863 (2)

LER-1982-007, Forwards LER 82-007/01T-0.Detailed Event Analysis Encl

Event date:
Report date:
2691982007R00 - NRC Website

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June 30, 1982 37 3..o n Mr. James P. O'Reilly, Regional Administrator U.-S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Re: Oconee Nuclear Station Docket No. 50-269

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-269/82-07. 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 Specifi-cations, 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.

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William O. Parker, Jr JFK/php Attachment cc: Document Control Desk Mr. W. T. Orders U. S. Nuclear Regulatory Commission NRC Resident Inspector Washington, D. C. 20555 Oconee Nuclear Station Records Center Institute of Nuclear Power Operations 1820 Water Place Atlanta, Georgia 30303

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Duke Power Company Oconee Nuclear Station Report Number: R0-269/82-07 Report Date: June 30, 1982 Occurrence Date: June 16, 1982 Facility: Oconee Nuclear Station, Seneca, South Carolina Identification of Occurrence: Keowee Hydro Station water fire suppression systems inoperable.

Conditions Prior to Occurrence: Oconee 1 - 100% FP Oconee 2 - 59% FP oconee 3 - Cold Shutdown Description of Occurrence: On June 16, 1982, during performance of environmental periodic surveillance, personnel were unable to obtain flow from an outside fire hydrant. With no water pressure availabic to the hydrant the water fire suppres-sion systems at Keowee were declared inoperable.

Apparent Cause of Occurrence: The apparent cause of the occurrence was blockage of the service water inlet screen by some unidentified foreign material.

Analysis of Occurrence: The Keowce Service Water System is utilized to provide dilution flow for liquid radwaste effluent from Oconee Nuclear Station. The dilution line was not being used during this event for radwaste release. The recurrence of this event while the dilution line is in service could result in the loss of dilution flow without the Operator's knowledge, since the dilution flow is not instrumented. To date, no credit has been taken for this line in radwaste release, although its flow has been utilized as an additional safety factor.

During the period of cime that the inlet was blocked, the generator CO2 system and portable fire extinguishers were available for fire suppression at Keowee.

The probability of a simultaneous fire at Keowee, loss of the fire suppression water system, and need for Keowee emergency power is considered to be extremely low. Thus, it is considered that this event is of no significance with respect to the health and safety of the public.

Corrective Action

The inlet valve was closed and then reopened allowing the l

foreign material to drift free, thereby restoring service water pressure and the water fire suppression system operability. The Keowee Operator's action of closing and opening the inlet valve reestablished system operability.

Com-pletion of a station modification will provide flow indication and alats on Low Flow in the Oconee Control Riom.

Expected completion date of this pot ion of the modification is January 31, 1983.

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