ML20052G506

Forwards LER 82-010/03L-0.Detailed Event Analysis Encl

ML20052G506
Person / Time
Site:	Oconee
Issue date:	05/07/1982
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20052G507	List: ML20052G506 ML20052G510
References
NUDOCS 8205180418
Download: ML20052G506 (2)

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DUKE POWER COMPANY POWER llUlt. DING A ,b Cg '*

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TELEPHONC AREA 704 set. e.oovevio= May 7, 1982 s 73-4c e s Mr. James P. O'Reilly, Regional Administrator U. S. Nuc1 car Regulatory Commission Region 11 101 Marietta Street, Suite 3100 ,

,3-Atlanta, Georgia 303G3 ,

Re: Oconee Nuclear Station Docket No. 50-269

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-269/82-10. This report is submitted pursuant to Oconee Nuclear Station Technical Specifica-tion 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.

Very truly yours, L p u & O, &

William O. Parker, Jr. ,// ((

JFK/php Attachment cc: Document Control Desk Records Center U. S. Nuclear Regulatory Commission Institute of' Nuclear Power Operations Washington, D. C. 20555 1820 Water Place Atlanta, Georgia 30339 Mr. W. T. Orders NRC Resident Inspector Oconee Nuclear Station OFFICIAL f, C0PY 82051BO N -

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Duke Power Company Oconee Nuclear Station Unit 1 Report Number: R0-269/82-10 Report Date: May 7, 1982 Occurrence Date: April 7, 1982 Facility: Oconee Unit 1, Seneca, South Carolina Identification of Occurrence: Reactor Eailding isolation valve 1 LWD-1 was inoperable.

Conditions Prior to Occurrence: 100% FP Description of Occurrence: On April 7, 1982, valve lLWD-1 did not close after pumping the Reactor Building normal sump. Valve ILWD-1 is the Reactor Building isolation valve for the Reactor Building normal sump; thus, this event is a

, degraded mode per Technical Specification 3.6.3.b.

Apparent Cause of Occurrence: The apparent cause of this event was a dirty contact in the valve operating motor starting compartment. The contact opens i when the " MOTOR OPEN" coil is energized in order to prevent the " MOTOR CLOSE" coil from being energized simultaneously. The dirty interlock contact did not close which prevented the " MOTOR CLOSE" coil from being energized when

. an attempt was made to close the valve.

Analysis of Occurrence: The redundant isolation valve, ILWD-2, was operable at the time of this event. Additionally, valve lLWD-2 was locked shut within one hour after valve ILWD-1 was declared inoperable. The problem with valve ILWD-1 was corrected and.the valve declared operable within four hours; thus, the health and safety of the public were not affected by this incident.

i Corrective Action: The valve was repaired by cleaning the dirty interlock I contact and cycling the valve. The Limitorque Preventive Maintenance procedure has been revised to require specific visual inspection of the contacts, and cleaning of the contacts as necessary.

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