ML20009C142

Forwards LER 81-008/01T-0.Detailed Event Analysis Encl

ML20009C142
Person / Time
Site:	Oconee
Issue date:	06/10/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009C143	List: ML20009C142 ML20009C148
References
NUDOCS 8107200320
Download: ML20009C142 (2)

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TELge o~g AngA 704 Vier Persiotut Stra.e PaccuCTio~ June 10, 1981 373-4 e s 3 Mr. James P. O'Reilly, Director )/fp U. S. Nuclear Regulatory Commission ,7,

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gU' g = '-' l-.}V9 Region II 101 Mariatta Street, Suite 3100 Atlanta, Georgia 30303 y jyL 17193j > [,

Re: Oconee Nuclear Station 8'N N s Ys Docket No. 50-269 /

Dear Mr. O'Reilly:

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Pleare find attached Reportable Occurrence Report R0-269/81-08. This report ~~~

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is submitted pursuant to Oconee Nuclear Station Technical Specification 6.6.2.1.a(9),

which concerns operation in a manner less conservative than assumed in the accident analyses, 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. My letter of May 27, 1981 addressed the delay in the preparation of this report.

Very truly yours, 4 1 William O. Parker, Jr.

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! cc: Director Mr. Bill Lavallee Office of Management & Program Analysis Nuclear Safety Analysis Center U. S. Nuclear Regulatory Commission P. O. Box 10412

! Washington, D. C. 20555 Palo Alto, CA 94303 I

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DUKE POWER COMPANY OCONEE NUCLEAR STATION Report Number: R0-269/81-08 Report' Dater--June 10, 1981 Occurrence Date: May 13, 1981 _

Facility: Oconee Nuclear Station, Seneca, South Carolina Identification of Occurrence: Loss of Automatic Operability for CCW-8 valve position Conditions Prior to Occurrence: Oconee 1 - 100% FP Oconee 2 - 100% FP Oconee 3 - 100% FP Description of Occurrence: At 1535 hours0.0178 days <br />0.426 hours <br />0.00254 weeks <br />5.840675e-4 months <br /> on May 13, 1981, a loss of valve position indication for GUW-8 was noticed. The valve was determined to be electrically in-operable. This is in violation of Technical Specification 3.4.4 and is thus re-portable pursuant to Technical Specification 6.6.2.1.a(9).

Apparent Cause of Occurrence: The loss of CCW-8 valve automatic operability was caused by an open circuit in several conductors in the control cable. The bad cable section was between the T-100 trench and the valve. Some construction activity is being conducted in the area of this cable, and the cable could have been damaged.._-

Analysis of Occurrence: With the turbine driven emergency feedwater pump, but without either electrical power or the presence of Lake Keowee, 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> are available before exhausting the supply of stored condensate pumped into the steam generators and the steam vented to the atmosphere.

The health and safety of the public were not affected by this incident. Placing an operator at the valve to manually open it if required was adequate protection.

Corrective Action: Immediate corrective action was to send an operator to the valve to verify operability. Operability was verified by manually cracking CCW-8 open and verifying flow through the valve. The valve was then closed and an operator stationed at the valve until electrical control was re-established.

The control cable was replaced and the valve electrically cycled. .

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