ML20128E525

Forwards Rev to Response to Request for Addl Info Q430.72 Re Calculations Performed to Determine Effects of Running Charging Pumps at Degraded Voltage Setting (88%)

ML20128E525
Person / Time
Site:	Vogtle
Issue date:	05/23/1985
From:	Bailey J GEORGIA POWER CO.
To:	Adensam E Office of Nuclear Reactor Regulation
References
GN-625, NUDOCS 8505290406
Download: ML20128E525 (4)

Text

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Georgia Power Company a

Flout) 2, Box 299A Waynesbor:, Georgb 00830 Telephone 404 554 9961 404 72L8114

)

Southern Company Services, Inc.

Post Office Box 2625 Birmingham, Alabama 35202 Telephone 205 8704011 Vgtle PMect May 23, 1985 Director of Nuclear Reactor Regulation File:

X7BC35 Attention:

Ms. Elinor G. Adensam, Chief Log GN-625 Licensin5 Branch #4 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C.

20555 REF:

BAIIEY TO DENTON, CN-598, ENCLOSURE B, DATED '5/6/85 REF:

BAIIEY TO DENTON, GN-605, DATED MAY 10, 1985 NRC DOCKET NUMBERS 50-424 AND 50-425 CONSTRUCTION PERMIT NUMBERS CPPR-108 AND CPPR-109 V0GTLE' ELECTRIC GENERATING PLANT - UNIIS 1 AND 2 REQUEST FOR ADDITIONAL INFORMATION:

Q430.72

Dear Mr. Denton:

Attached for the review of your staff is a revision to the response to Q430.72. This revision supercedes the responses provided in the referenced letters.

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

Sincerely,

'b-

@7 J. A. Bailey Project Licensing Manager JAB /msp Attachment xc: List Attached 52 % % h ob 4

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l Mr. Denton:

May 23, 1985 l

Page two xc:

D. O. Foster 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 (w/o att.)

D. C. Teper (w/o att.)

L. Fowler 0269a l

I l'

r 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 lower speed.

Th'e effects of running at the reduced voltage are a temperature rise of

'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 thermalastic epoxy insulation designed ~ to NEMA Class F requirements. Per Section MG1-20.40 of the NEMA standards, the maximum temperature 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 88% voltage is 85 C, which is lower than the maximum temperatures allowed by NEllA Standards for Class F insulation.

A further evaluation has been performed to determine the effect of running the VEGP charging pumps at a degraded voltage of 86.5%. The result of this evaluation is 'that the maximum temperature' rise would be 90 C.

As can be seen in the previous discussion, this 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 which corresponds to 86.5% voltage and 1753 RPM)'is acceptable with respect to the analysis curve.

FROM I,

(THU)05.23.'85 10:06 HO.S PAGE 3 i,

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