ML20117L671

Forwards Rev to 850506 Response to Request for Addl Info Re Effects of Running Charging Pumps at Degraded Voltage Setting.Comparative Flow Curves Encl Show Degraded Voltage Curve Acceptable W/Respect to Analysis Curve

ML20117L671
Person / Time
Site:	Vogtle
Issue date:	05/10/1985
From:	Bailey J GEORGIA POWER CO.
To:	Adensam E Office of Nuclear Reactor Regulation
References
GN-605, NUDOCS 8505160351
Download: ML20117L671 (3)

Text

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r-A Georgi) Power Company -

• ' Rout] 2. Box 299A Waynesboro. Georgi 30830

arlephone 404 554-9961 404 724-8114 Southern Company Services. Inc.

Post Office Box 2625 Birmingham, Alabama 35202 Telephone 205 870-6011 Vogtie Proj.ect May 10, 1985 l

Director of Nuclear Reactor Regulation File: X7BC35 Attention: Ms. Elinor G. Adensam, Chief Log: GN-605 Licensing Branch #4 Division of Licensing U. S. Nuclear Regulatory Commission

- Washington, D.C. 20555 REF: BAILEY TO DENTON, GN-598, ENCLOSURE B, DATED 5/6/85 NRC DOCKET NUMBERS 50-424 AND 50-425 CONSTRUCTION PERMIT NUMBERS CPPR-108 AND CPPR-109 V0GTIE ELECTRIC GENERATING PLANT - UNITS 1 AND 2 REQUEST FOR ADDITIONAL INFORMATION: Q430.72

Dear Mr. De.ston:

Attached for the review of your staff is a revision to the response to Q430.72. This revision was requested by telephone on May 8, 1985 and supercedes the response provided in the referenced letter.

If your staff requires any additional information, please do not hesitate to contact me.

Sincerely, J. A. Bailey Project Licensing Manager JAB /sm Attachment xc: D. O. Foster j R. A. Thomas J. E. Joiner, Esquire B. W. Churchill, Esquire M. A. Miller B. Jones, Esquire (w/o att.)

L. T. Gucwa G. Bockhold, Jr.

T. Johnson 8505j0 05 4 C Tep p , ,r D gD ,

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i I Vogtle Project File 0205m

430.72(c)

Calculations have been performed to determine the effects of running the VEGP charging pumps at the degraded voltage setting (88%). The effect of running at this reduced voltage would be a temperature rise of the insulation system of the motor and the motor would run at a lowe,r speed. The effects of running at the reduced voltage are a temperature rise Ob 85'c and speed of 1755 RPM (synchronous speed is 1800 RPM and operating speed is 1771 RPM).

The insulation system used in the GAE charging pump motors is therwelastic epoxy insulation designed to NEMA Class F requirements. Per Section MG1-20.40 of the NEMA Standards, the maximum temperture rise by resistance based on an ambient temperature of 40'C with 1.15 or higher service factor for Class F insulation systems is 105'C. The temperature rise of the GAE charging pump motors at 80% voltage is 85*C, which is lower than the maximum temperatures allowed by NEMA Standards for Class F insulation.

Attached are flow curves for comparison of the vendor minimum curve, accident analysis curve and the curve resulting from the degraded voltage. As can be seen, the degraded voltage curve is acceptable with respect to the analysis curve.

0371n/RJM/5-85

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