ML18033B082

Submits Final Response to NRC 890831 Request for Addl Info Re RHR Pump Motor Thermal Damage Curve & Insulation Class, Rated Temp Rise & Rated Ambient Temp

ML18033B082
Person / Time
Site:	Browns Ferry
Issue date:	12/14/1989
From:	Michael Ray TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
TAC-75242, NUDOCS 8912200207
Download: ML18033B082 (10)

Text

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ACCESSION NBR:8912200207 DOC.DATE: 89/12/14 NOTARIZED: NO DOCKET FACIL:50-260 Browns Ferry Nuclear Power Station, Unit 2, Tennessee 05000260 AUTH.NAME AUTHOR AFFILIATION RAY,M.J.

Tennessee Valley Authority RECIPE NAME RECIPIENT AFFILIATXON Document Control Branch (Document Control Desk)

SUBJECT:

Submits final response to NRC 890831 request for addi info re RHR pumps at facility.

DISTRIBUTION CODE:

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TENNESSEE VALLEYAUTHORITY CHATTANOOGA, TENNESSEE 37401 5N 157B Lookout Place U.S. Nuclear Regulatory Commission ATTN:

Document Control Desk Washington, D.C.

20555 Gentlemen:

Docket No. 50-260 In the Matter of

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Tennessee Valley Authority

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BRONNS FERRY NUCLEAR PLANT (BFN) RESPONSE TO REQUEST FOR ADDITIONAL.:

INFORMATION CONCERNING THE RESIDUAL HEAT REMOVAL (RHR)

PUMPS This letter is TVA's final response to NRC's letter of August 31,

1989, requesting additional information concerning the RHR pumps for BFN, Unit 2.

Four items of additional information (1.0 through 4.0) were requested to allow further investigation and evaluation of RHR motor protection and RHR motor operating temperatures.

On November 6,

1989, TVA submitted information regarding Item 2.0 (RHR pump motor electrical protection relay settings, including the current transformer ratios) and Item 3.0 (RHR pump head horsepower versus flow curve).

Additional time was requested in this submittal to obtain the information needed for Item 1.0 (RHR pump motor thermal damage curve) and Item 4.0 (RHR pump motor insulation class, rated temperature

rise, and rated ambient temperature) from General Electric.

Enclosure 1 of this submittal contains the information requested for Item 1.0, and Enclosure 2 contains the information requested for Item 4.0.

This information is considered typical of all four RHR pumps on Unit 2.

This submittal contains no commitments.

If you have any questions, please telephone Patrick P. Carier, BFN, at (205) 729-3570.

Very truly yours, TENNESSEE VALLEY AUTHORITY Enclosures cc:

See page 2

Man ger, Nuclear IL censing and Regulatory Affairs 8'9i2200207 89i2i4 PDR ADOCK 05000260 P

PNU An Equal Opportunity Employer

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U.S. Nuclear Regulatory Commission cc (Enclosures):

Ms.

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C. Black, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. B. A. Wilson, Assistant Director for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Browns Ferry Nuclear Plant Route 12, Box 637 Athens, Alabama'5609-2000

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ENCLOSURE 1

RESPONSE

TO REQUEST FOR ADDITIONAL INFORMATION CONCERNING THE RESIDUAL HEAT REMOVAL (RHR)

PUMPS Item 1.0 The RHR Pump Motor Thermal Damage Curve The following thermal damage curve relates current versus time This curve is drawn based on the stall time data available for the subject motor; i.e.,

14 seconds from 80 degrees C motor temperature or 20 seconds from initial motor temperature of 30 degrees C.

The electrical design data for this motor was used to calculate and verify other points of the curve.

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TVA-BRONNSFERRY H, RHR MOTOR MODELNUMBER5E6348XCDA 2000 HP-4P-1860RPM-3PHAOHz-4000U

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7IMECURRERF HEAT%6CURVE BASE CURRKNT255 hMP DO 2

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1 10 100 1000 SAFE TIMEINSECONDS

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Hotel 10/69-1 JO Note2 Calculations shou that this motor is rotor limited, i.e. if stalled, rotor bars vould reach higher temperature before copper vinding in the stator.

Sate Time at full load current is equal to the rated running lite ot the lotor.

GE NUCLEAR ENERGY SAN JOSE. CAUFORi41A

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ENCLOSURE 2

RESPONSE

TO REQUEST FOR ADDITIONAL INFORMATION CONCERNING THE RESIDUAL HEAT REMOVAL (RHR)

PUMPS Item 4.0 Provide the RHR pump motor insulation class, rated temperature

rise, and rated ambient temperature.

Stator winding is Custom Polyseal, class B insulation.

Rated temperature rise is 40 degrees C by thermometer and the corresponding temperature rise by resistance is 50 degrees C.

Rated maximum ambient temperature is 65 degrees C for long-term operation of the motor.

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