ML20041F825

Forwards LER 82-004/01T-0.Detailed Event Analysis Encl

ML20041F825
Person / Time
Site:	Oconee
Issue date:	03/03/1982
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20041F826	List: ML20041F825 ML20041F828
References
NUDOCS 8203170453
Download: ML20041F825 (2)

Text

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DUKE POWEH COMPMY PowsaIJuimawo ,

422 Sourn Cuuacu Staser, CnAumrre, N. C. asa4a M t  ;

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.. u: J Mr. James P. O'Reilly, R'egional Administrato D **

U. S. Nuclear Regulctory Commission ([d ' ' 6 Region II j 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303

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Re: Oconee Nuc1 car Station -

j g g Docket No. 50-269 y,.

Dear Mr. O'Reilly:

A Please find attached Reportable Occurrence Report R0-269/82-04. This report is submitted pursuant to Oconee Nuclear Station Technical Specification 6.6.2.1.a(9), which concerns the discovery of conditions not specifically considered in the safety analysis report or Technical Specifications that require corrective measures to prevent the existence or development of an unsafe condition, and describes an incident which is considered to be of no significance with respect to its affect on the health and safety of the public.

Vdry truly yours,'

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. n to . - -

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William O. Parker, J

{ JFK/php Attachment l

! cc: Director Records Center Office of Management & Program Analysis Institute of Nuclear Power Operations U. S. Nuclear Regulatory Commission 1820 Water Place Washington, D. C. 20555 Atlanta, Georgia 30339 l

Mr. W. T. Orders NRC Resident Inspector Oconee Nuclear Station U; FICIAL COPY

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8203170453 820303 PDR ADOCK 05000269 0 PDR

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DUKE POWER COMPANY OCONEE NUCLEAR STATION UNIT 1 Report Number: R0-269/82-04 Report Date: March 3, 1982 Occurrence Date: February 17, 1982 Facility: Oconee Unit 1, Seneca, South Carolina I Identification of Occurrence: Reactor Coolant System Normal Makeup Line Weld Radiography Test indicated a void.

Conditions Prior to Occurrence: Cold Shutdown Description of Occurrence: On February 17, 1982, examination of a radiograph on weld #85 on Isometric Drawing 11 of system 51A (High Pressure Injection) indicated a 3600 circumferential void. The defective joint involved is where the 1 inch nozzle warming lines connect to the 2 inch normal makeup line on the 1A2 pump side.

Apparent Cause of Occurrence: The apparent cause of this incident was an improper fit-up, weld, and inspection during initial construction. The defective weld joint should have been a " saddle on" fit-up with a full pene-tration weld. The joint was found to have a non-code fit-up with a fillet weld. The only Non-Destructive Examination performed on the defective weld was Liquid Penetrant Testing. Since the defect in this joint is subsurface, the Liquid Penetrant Test did not identify the defect.

Analysis of Occurrence: The complete failure of this weld would have resulted in a 1.4e inchz (0.01 ft , 21eax in the ,eactor coo 1 ant System, as we11 as a partial loss of normal makeup to the Reactor Coolant System.. This size break is \ of the smallest break considered by the safety analysis to have the potential for uncovering the core, since the capacity of one High Pressure Injection pump would exceed the break flow. Thus, it is considered that this event did not have a significant affect on the health and safety of the public.

Corrective Action: The defective joint was repaired by replacing a 12 inch section of the 2 inch pipe and making a " saddle on" fit-up and full penetra-tion weld with a coupling that was socket welded to the 1 inch pipe. Non-Destructive Examination was performed satisfactorily, and the joint will be hydrostatically tested by the mini-hydro during unit startup. The same joint on 1A1 Normal Makeup Line was radiographically examined and was determined to be acceptable. The identical joints on Oconee 2 and 3 will be examined during the radiographic examinations currently being conducted on the High Pressure Injection nozzles.