ML19340E456

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Forwards Low Pressure Disc Ultrasonic Insp Rept, in Response to NRC 810105 Request for Results of Insp Conducted at Facility.Cracks Were Discovered in Some Discs.Refurbished Rotors Will Be Installed
ML19340E456
Person / Time
Site: Farley Southern Nuclear icon.png
Issue date: 01/12/1981
From: Clayton F
ALABAMA POWER CO.
To: Varga S
Office of Nuclear Reactor Regulation
Shared Package
ML19340E457 List:
References
NUDOCS 8101140554
Download: ML19340E456 (2)


Text

AtbiffG Power Comp;ny 600 North 16th street Post OfSce Box 2641 Birmingnam. Alabama 35291 Teiepnone 205 250-1000 F. L CLAYToN. JR.

m Senior Vice President Alabama Power the southern eor:rc 5,S:em l

January 12, 1981 '3 Docket No. 50-348 _ ,

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Mr. Steven A. Varga, Chief ~?

Operating Reactors Branch 1 ,3 4 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C. 20555 JOSEPH M. FARLEY NUCLEAR PLANT - UNIT 1 LOW PRESSURE (LP) TURBINE DISC INSPECTION RESULTS

Dear Mr. Varga:

In response to your letter of January 5,1981 the results of the LP Turbine Disc inspection recently conducted at the Farley Nuclear Plant are submitted as Enclosure (1).

All discs on LP Rotor 1 and LP Rotor 2 were inspected using ultrasonic techniques developed by Westinghouse specifically for this application. During the inspection, cracks were discovered in some ,

discs; the size and location of which are given in Enclosure (1).

The aspect ratio of the cracks cannot be determined by ultrasonic techniques because the axial depth (or length) of the crack cannot be measured; therefore, we are unable to provide this information.

Alabama Power Company is in the process of installing in Farley j Nuclear Plant Unit 1 two new LP Turbine Rotors (originally intended l for the Carolina Power and Light Shearon Harris Plant) that were I obtained through Westinghouse. The discs in the new rotors are the  ;

same Westinghouse BB281 design as the existing Farley Nuclear Plant i Unit 1 discs. These new rotors have been evaluated using the present i NRC crack growth rate formulas and were found to meet service life requirements fcr cycle 3 for Farley Nuclear Plant Unit 1. The results of these calculations are included in Enclosure (1), Table 2. The detailed computer printout givir.g disc material properties, bore stress data, critical crack size, crack growth rates, etc., as calculated .

by Westinghouse, will be submitted in the near future.  !

l wwb g ,y

Joseph M. Farley Nuclear Plant - Unit 1 Low Pressure (LP) Turbine Disc Inspection Results January 12, 1981 Page 2 The original Farley Nuclear Plant Unit 1 Rotors are being shipped to Westinghouse for refurbishment. This refurbishment will include replacement of discs 1, 2, and 3 with the Westinghouse

" Key-Plate Design" disc. Alabama Power Company plans to install the refurbished rotors in the Unit 1 turbine at the next refueling outage.

If you have any further questions, please contact Mr. William Ware (205) 250-1000 extension 3619.

Very truly yours, 7

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-( F. L. Clayton, Jr.

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WW:bs Enclosure cc: Mr. R. A. Thomas Mr. G. F. Trowbridge Mr. L. L. Kintr:er Mr. E. A. Reeves Mr. W. H. Bradford l

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