TXX-9646, Provides Response to RAI & Editorial Correction for License Amend Request 96-005 Re Inverter/Battery Charger Mod

Provides Response to RAI & Editorial Correction for License Amend Request 96-005 Re Inverter/Battery Charger Mod

ML20134B976
Person / Time
Site:	Comanche Peak
Issue date:	09/19/1996
From:	Terry C, Walker R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20134B979	List: ML20134B980 TXX-9646, Provides Response to RAI & Editorial Correction for License Amend Request 96-005 Re Inverter/Battery Charger Mod
References
TXX-96469, NUDOCS 9609240198
Download: ML20134B976 (3)

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File # 916 (3/4.8)

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Ref. # 10CFR50.90 l . C 10CFR50.36

1UELECTRIC c.t c. Terry September 19, 1996 Group Vice Presided U. S. Nuclear Regulatory Commission Attn: Document Control Room Washington, DC 20555 t

SUBJECT:

COMANCHE FEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50 445 AND 50 446 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION AND EDITORIAL CORRECTION FOR LICENSE AMENDMENT REQUEST 96-005 INVERTER / BATTERY CHARGER MODIFICATION REF: 1) TU Electric letter TXX 96432 dated July 31, 1996, from C. L. Terry to the Nuclear Regulatory Commission,

" Submittal of License Amendment Request 96 005 pertaining to Inverter / Battery Charger Modification"

2) TU Electric letter TXX 96447 dated August 23, 1996, from C. L. Terry to the Nuclear Regulatory Commission.

" Response to request for additional information on  !

License Amendment Request 96 005" l

3) TV Electric letter TXX 96451 dated August 27, 1996, from C. L. Terry to the Nuclear Regulatory Commission. l

" Response to request for additional information on  !

License Amendment Request 96 005" l

4) Telephone conference call from T. J. Polich, A. S. Gill i and S. K. Mitra of Nuclear Reguletory Commission to l R. D. Walker of TV Electric on September 13, 1996

( l l Gentlemen:

By Reference 1. TU Electric submitted License Amendment Request 96 005 to amend the CPSES Unit 1 facility operating license (NPF 87) and CPSES j Unit 2 facility operating license (NPF 89). These changes are associated I with a plant modification in which the inverters and battery chargers are being replaced and an installed spare inverter is being added for each I

safety train. Per References 2 and 3. TV Electric provided responses to earlier NRC questions on the License Amendment Request.

. Attachment 3 of Reference 1 pertained to the mark up of affected Technical Specification (NUREG 1468) pages. Page 3/4 816 of Reference 1 Attachment 3 inadvertently failed to add the word " inverter." at the end

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Page 2 of 3 l of the marked up foot note similar to other mark ups on pages 3/4 815 and l 3/4 8 17. Attached to this transmittal is a mark up of the affected l Technical Specification (NUREG 1468) page 3/4 816 correcting this i

editorial error. This change / correction does not change the analysis and i conclusions of Reference 1 and is consistent with the intent of the I License Amendment Request. '

Additionally, in response to NRC questions during telephone conference i l (Reference 4), the following information is provided: '

Question 1: Has the battery charger rating increase from 225 Amps to j 300 Amps, been considered for impact on the Emergency Diesel Generator (EDG) capacity?

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( Response 1: TU Electric has considered the impact of the new battery chargers on the Emergency Diesel Generator (EDG) capacity and determined that the EDG loading is acceptable. The loading impact is addressed in calculation EE CA 0007 3377 Revision 1 CCN #3,

" Unit 1 Diesel Generator Database Report."

Question 2: Are the interfacing cables for the new battery chargers l being replaced due to the increase in battery charger rating from 225 Amps to 300 Amps?

! Response 2: The cables interfacing with the battery chargers will l not be replaced. These cables were originally designed for 300 Amp i battery chargers and are therefore suitable for the new battery l chargers.

I 1 Question 3: Identify whether the Design Basis Accident (DBA) or l Station Blackout (S80) scenario is more limiting for the battery l capacities. Are the batteries capable of handling the Design Basis  !

l Accident (DBA) and Station Blackout (SB0) requirements, with the l

! load change resulting from the inverter and battery charger modification?

Response 3: CPSE3 Class 1E battery sizing calculations do not I differentiate between DBA and SB0 loads. The calculations assure that the batteries are adequately sized to feed all DC loads (inclusive of all DBA, SB0 and other loads connected to the battery) for 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> in case of loss of AC power, with a margin of 15% after considering aging factor of 1.25 and taking into account the

! temperature correction factor for the minimum electrolyte I temperature of 67'F. The calculations also assure that the battery end of the duty cycle voltage is equal to or greater than 105 Volts.

Battery duty cycle of 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> meets the CPSES SB0 coping requirements. CPSES Class 1E battery sizing continues to meet these requirements after the inverter / battery charger modification. These evaluations for battery capacity and voltage profile are documented in calculations 16345 EE(B) 053 Revision 5 CCN #7, " Sizing

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. T)(X-96469 Page 3 of 3 i Verification Class 1E Batteries and Battery Chargers" and EE CA-l 0009 3025 Revision 0, CCN #1, " Station Blackout Class 1E Battery Capacity." The adequacy of available voltage at the equipment terminal has been established, in various calculations, based on

'l battery output voltage of 105 Volts. The adequacy of the DC input terminal voltages at the UPS inverter:: has been verified in calculation 16345 EE(B)-011 Revision 8 CCN #3, " Validation of Cable Sizing Calculation DC System for Class 1E Cables Based on Voltage Drop and Ampacities." i The SB0 loading on the non Class 1E batteries has been reviewed and

the batteries are adequately sized to cope with the SB0 scenario as documented in calculation EE CA 0009-3017 Revision 0, CCN #2, "Non Safety Battery & Charger Size (Battery BT1D2, BT1D4, BT105)."

l Please note that the calculations at CPSES are updated from time to time ,

according to plant procedures. Should you have any additional questions, please contact Mr. Jacob H. Kulangara at (817) 897 0124.

l Sincerely, G.2. Q C. L. Terry By: MdN Roger D. Walker Regulatory Affairs Manager JHK/jmk Attachment

! c- Mr. T. J. Polich, NRR l

Mr. L. J. Callan, Region IV Hs. J. I. Tapia, Region IV Resident Inspectors, CPSES Mr. Arthur C. Tate Bureau of Radiation Control Texas Department of Public Health I

1100 West, 49th Street  !

! Austin, Texas 78704 I I

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