ML20027D850

Forwards LER 82-011/03L-0.Detailed Event Analysis Encl

ML20027D850
Person / Time
Site:	Oconee
Issue date:	11/03/1982
From:	Tucker H DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20027D851	List: ML20027D850 ML20027D854
References
NUDOCS 8211100256
Download: ML20027D850 (2)

Text

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DUKE POWER GOMPANY, 3.,,

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= = = = = = = = November 3, 1982 3 9 g,

00 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. 50-287

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-287/82-ll. 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 sig-nificance with respect to its effect on the health and safety of the public.

Very truly yours, N [p ~

Hal B. Tucker JCP/php Attachment cc: Document Control Desk U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Mr. W. T. Orders NRC Resident Inspector Oconee Nuclear Station INPO Records Center Suite 1500 1100 Circle 75 Parkway Atlanta, Georgia 30339 Mr. Philip C. Wagner Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission' Washington, D. C. 20555 gVN

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DUKE POWER CCTStNY OCONEE NUCLEAR STATION Report Number: R0-287/82-ll Report Date: November 3, 1982 Occurrence Date: October 4, 1982 Facility: Oconee Unit 3, Seneca, South Carolina Identification of Occurrence: Snubber was found to be inoperable'.

Conditions Prior to Occurrence: 40% FP Description of Occurrence: On October 4, 1982, at 1525, a mechanic reinspected a Unit 3 mechanical snubber that was located on the main steam supply to the emergency feedwater pump turbine line that was installed October 2, 1982, and found it to be bottomed out, thus inoperable. At this time Unit 3 was at 40 percent full power conducting Power Escalation Testing.

Apparent Cause of Occurrence: The cause of this occurrence was attributed to

-installation deficiency. During installation, the mechanic misread the snubber setting on the hanger sketch, and adjusted the snubber to a lower than required setting.

Analysis of Occurrence: The installation deficiency would have been noticed when Quality Assurance inspected the job. The probability of an earthquake was very low, and the removal of this snubber did not cause the Turbine Driven Emergency Feedwater Pump Turbine to be inoperable. Also, the Motor Driven Fmergency Feedwater Pumps were operable during this time. The snubber was reinstalled within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> as allowed by Technical Specification 3.14.2, and no radiation was released as a result of this incident. The health and safety of the general public were not endangered as a result of this incident.

Corrective Action: The immediate corrective action was to remove the snubber and manually cycle the snubber to ensure it was not frozen or jammed. Then the hanger was modified to get the proper settings, and the snubber was then reinstalled. This work was completed within 45 hours5.208333e-4 days <br />0.0125 hours <br />7.440476e-5 weeks <br />1.71225e-5 months <br />. The man who made the error and his supervisor were counseled concerning the error. Further, a letter has been written to all people involved in hanger fabrication concerning checking all dimensions provided on a hanger sketch.

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