ML20005A305

Forwards LER 81-004/03L-0.Detailed Event Analysis Encl

ML20005A305
Person / Time
Site:	Oconee
Issue date:	04/09/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20005A306	List: ML20005A305 ML20005A314
References
NUDOCS 8106300175
Download: ML20005A305 (2)

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Docket No.60-270 '- "s 'S' s .., (f ( g ;- -

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-270/81-4. This report is

' submitted pursuant to Oconee Nuclear Station Technical Specification 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 signi-ficance with respect to its effect on the health and safety of the public.

My letter of April 3, 1981 addressed the delays in the preparation of this re-port.

Very truly yours, w - Y William O. Parker, Jr. /N JIJ:pw Attachment ec: Director Mr. Bill I,avallee Office of Management & Program Analysis Nuclear Safety Analysis Center U.S. Nuclear Regulatory Ccamission Post Office Box 10412 Washington, D. C. 20555 Palo Alto, California 94303 1

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P DUKE POWER COMPANY OCONEE UNIT 2 Report Number: R0-270/81-4 Report Date: -April 9, 1981 Occurrence Date: March 4, 1981 Facility: Oconee Unit 2, Seneca, South Carolina Identification of Occurrence: MDEEMP Declared inoperable Due to Arcing In The Motor.

Conditions Prior to Occurrence: 74% FP Description of Occurrence: At approximately 1354 on March 4, 1981, the "2B" Motor Driven Emergency Feedwater Pump (MDEFWP) was declared inoperable due to arcing in the motor. This constitutes operation in a degraded mode per Technical Specif1-cation 3.4.1.c and is thus reportable pursuant to Technical Specification 6.6.2.1.b(2).

Apparent Cause of Occurrence: It was apparent from the inspection of the stator that the motor had suffered a short in the coil slot approximately six inches into the stator from the outboard end of the motor. It is not known at this time what the exact cause of the. failure was, but it is known that the motor had been dropped upon assembly at the time of manufacture. However, the motor was reinspected at this time and no damage was apparent from this inspection.

Analysis of Occurrence: Either one of the MDEFWP's or the IDEFWP will provide sufficient feedwater to the steam generators to maintain core cooling in the worst case of a normal feedwater accident. During the inoperability of the "23" MDEFWP, the "2A" MDEFWP and the TDEFWP were operable, thus providing the necessary flow to prevent loss of steam generator feedwater. Hence, the health and safety of the public were not compromised by this incident.

Corrective Action: Immediately after the motor flashed, the breaker was tagged out and Generating Station Support personnel were called to take a look at the motor. A work request was written to investigate the trouble. The motor was dissassembled, and the failure was found in the coil slot. It was then decided i l

that a spare motor would have to be obtained to return the system to operation.

The motor was removed from the base, and a new motor was found at Catawba Nuclear Station, transferred to Oconee Nuclear Station, and set into place. At 0145 on March 7,1981, power reduction began, since the 60 hour6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br /> time limit ha1 expired.

The motor was hooked up and a thirty minute test run was performed. datisfactory results were achieved and the pump was then coupled to the motor. The unit began returning to 74% FP at 0558 on March 7, 1981. The lowest power level achieved was approximately 45% FP.