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

ACCZEZm TED Dl UTION DEMONsTRE N SYSTEM REGULATORY NFORMATXON DISTRIBUTION S ~ EM (RIDS)

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 facility.

re RHR pumps DISTRIBUTION CODE: D030D TITLE: TVA Facilities at COPIES RECEIVED:LTR Routine Correspondence J ENCL I SIZE: 5 D

NOTES:1 Copy each to: S.Black,D.M.Crutchfield,B.D.Liaw, 05000260 R.Pierson,B.Wilson S RECIPIENT COPIES l.

RECXPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL h LA 1 1 PD 1 1 GEARSgG 1 1 INTERNAL: ACRS 1 1 NUDOCS-ABSTRACT 1 1 OC/LFMB 1 0 OGC/HDS2 1 0 1 1 EXTERNAL: LPDR 1 1 NRC PDR 1 1 NSIC 1 1 NOTES: 5 5 h

TOTAL NUMBER OF COPIES REQUIRED: LTTR 16 ENCL 14

r I 'll 'P 0 0 A P

I

t TENNESSEE VALLEY AUTHORITY t

CHATTANOOGA, TENNESSEE 37401 5N 157B Lookout Place U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

In the Matter of ) Docket No. 50-260 Tennessee Valley Authority )

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 Man ger, Nuclear IL censing and Regulatory Affairs Enclosures cc: See page 2 8'9i2200207 89i2i4 An Equal Opportunity Employer PDR ADOCK 05000260 P PNU

( >Ital,p~ g> f gg ~~Q 2'

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

Ms. S. 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

I 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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I TVA-BRONNS FERRY H, RHR MOTOR MODEL NUMBER 5E6348XCDA 2000 HP-4P-1860RPM-3PHAOHz-4000U MOIOR AT 80C MOK)R AT 30 C

'iKMP. MTlALTEhP.

7IME CURRERF HEAT%6 CURVE BASE CURRKNT255 hMP D

O 2 0 ~

) 1 10 100 1000 SAFE TIMEIN SECONDS ~~ ~ ' ~

jY. ~~ 0 I<

Hotel Calculations shou that this motor is rotor limited, i.e.

stalled, rotor bars vould reach higher temperature before if GE NUCLEAR ENERGY

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I/i I~is copper vinding in the stator.

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SAN JOSE. CA UFORi41A ~

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10/69-1 JO Note2 Sate Time at full load current is equal to the rated running lite ot the lotor. ~ ~

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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