L-2012-191, Responses to Requests for Additional Information Related to LAR 210, DC Sources

Responses to Requests for Additional Information Related to LAR 210, DC Sources

ML12130A203
Person / Time
Site:	Turkey Point
Issue date:	04/30/2012
From:	Kiley M Florida Power & Light Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-2012-191 EC 275971, Rev 0
Download: ML12130A203 (24)

Text

0FPL. APR 3 0 2012 L-2012-191 10 CFR 50.90 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555-0001 Re: Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-251 Responses to Requests for Additional Information Related to LAR 210, DC Sources

References:

1) Florida Power & Light Company to U.S. Nuclear Regulatory Commission, "Proposed Change to Turkey Point Technical Specifications Regarding D.C. Sources Surveillance Requirements Revised License Amendment Request (LAR) No. 210," dated August 10, 2011 (NRC Accession No. MLl 1227A006).

2) E-Mail U.S. Nuclear Regulatory Commission (J. Paige) to Florida Power & Light Company (B. Tomonto, 0. Hanek), "Turkey Point Units 3 and 4 - DC Sources LAR -

Request for Additional Information (ME6859/60)," dated March 5, 2012 (NRC Accession No. ML12065A296).

By letter dated August 10, 2011 (Reference 1), Florida Power & Light Company requested a License Amendment to Renewed Facility Operating Licenses DPR-31 and DPR-41 for Turkey Point Units 3 and 4. The proposed License Amendment would revise the Turkey Point Units 3 and 4 Technical Specification Surveillance Requirement 4.8.2.1 pertaining to periodic verification of battery bank capacity and intercell and connection resistance. By Reference 2 the NRC requested additional information related to the review of this proposed License Amendment. The response to this request is provided in the Enclosure to this letter.

The response does not alter the conclusion of the No Significant Hazards Consideration or environmental assessment as provided in Reference 1.

This response does not contain any new commitments and does not revise any existing commitments.

Florida Power & Light Company 9760 SW 344th St., Homestead, FL 33035

Turkey Point Units 3 and 4 L-2012-191 Docket Nos. 50-250 and 50-251 Page 2 Responses to Requests for Additional Information Related to LAR 210, DC Sources If you have any questions, please contact Mr. Robert Tomonto, Licensing Manager, at (305) 426-7327.

I declare under the penalty of perjury that the foregoing is true and correct.

Executed /gpr,/ / .3, 2VIlZ Very truly yours, Michael W. Kiley Vice President, Turkey Point Nuclear Generating Station Enclosure cc: Regional Administrator, Region II, USNRC USNRC Project Manager, Turkey Point Nuclear Plant Senior Resident Inspector, USNRC, Turkey Point Nuclear Plant Mr. W. A. Passetti, Florida Department of Health

Turkey Point Units 3 and 4 L-2012-191 Docket Nos. 50-250 and 50-251 Enclosure Responses to Requests for Additional Information Page 1 of 5 Related to LAR 210, DC Sources ENCLOSURE Response to Request for Additional Information Related to LAR 210, DC Sources

Turkey Point Units 3 and 4 L-2012-191 Docket Nos. 50-250 and 50-251 Enclosure Responses to Requests for Additional Information Page 2 of 5 Related to LAR 210, DC Sources NRC RAI No. 1 In the license amendment request (LAR), the licensee stated that each battery is sized to provide power to its loads for two hours during a design basis accident concurrent with a Loss of Offsite Power (LOOP) without terminal voltage falling below the required voltage. The capability of the safety-related batteries to provide required power is demonstrated by the performance of 30 minute service and 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> performance tests. The 30 minute service testing time is based on the time required to manually load a charger during a station blackout event.

According to NRC Standard TS NUREG-143 1, Section 3.8.4, the service test should cover the design duty cycle. Since, the battery is sized for two hours duration to ensure continued operation of equipment following a design basis accident concurrent with a LOOP, the staff position is that the service test is required to be performed for two hours to demonstrate that the design duty cycle can be met consistent with the intent of the TS. The licensee should either demonstrate that 30 minute station blackout duty cycle loads are more conservative than the two hours design basis duty cycle loads or modify the service test duration to two hours to the meet the intent of the TS. The modification should include revision to the UFSAR [Updated Final Safety Analysis Report] and TS Bases.

FPL Response:

Turkey Point Units 3 and 4 are not licensed to NRC Standard Technical Specification NUREG-1431. The current Turkey Point Units 3 and 4 battery Technical Specifications (TS) do not include a stated / specified service testing time period requirement. The service testing time of 30 minutes was conservatively based on the time require to load a battery charger during a station blackout (SBO) event. The SBO loading is basically the same as would be seen during the first 30 minutes of the two hour loading period. SBO is the only design basis accident condition in which operating on the battery for any length of time is a requirement. For all other design basis accident conditions redundancy and single failure criteria ensures that a battery charger is available to power the DC busses. For a Loss of Offsite Power event, battery chargers are loaded onto the Emergency Diesel Generators within 16.5 seconds and considering any single failure. By design, the batteries are only supplying the load for 16.5 seconds. Thus, the SBO 30 minute time period is the longest period the batteries would be required to support mitigation activities for a design basis accident.

The capability of the vital AC/DC system to provide power to at least one Auxiliary Feedwater Pump System pump train for at least two hours during loss of all offsite and onsite AC power is the result of a response to a post-TMI item (Florida Power & Light Company to U.S. Nuclear Regulatory Commission, Letter L-79-354, "Auxiliary Feedwater System," dated December 20, 1979). This was a requirement to perform an analysis only, since it was not associated with or required by any design basis accident scenario. Thus, the 30 minute SBO battery service test validates the battery's capability for the longest required battery operating period to support a design basis accident scenario.

Turkey Point Units 3 and 4 L-2012-191 Docket Nos. 50-250 and 50-251 Enclosure Responses to Requests for Additional Information Page 3 of 5 Related to LAR 210, DC Sources NRC RAI No. 2 In the LAR, the licensee stated that the requested TS SR revised battery cell connection resistance values are based on past battery surveillances measured resistance values for clean, tight battery cell connections plus a small margin (5 to 7 micro-ohms, approximately 20%). Provide the results of at least two past battery surveillances showing the measured resistance values.

FPL Response: of Procedure 0-SME-003.04 provides the as found measured resistance values for recent surveillances of safety related Batteries 4B, 3B, 4A and 3A. Attachment 2 of Procedure 0-SME-003.04 identifies the acceptance criteria and is also provided. All measured resistance values are within the acceptance criteria. (See Attachment 1 of this Enclosure)

Battery Work Order Date Surveillance 4B (4D03) 40058622-1 10/06/2011 0-SME-003.04 Attachment 3 3B (3D24) 40084961-1 10/25/2011 0-SME-003.04 Attachment 3 4A (4D24) 39005472-1 2/08/2010 0-SME-003.04 Attachment 3 3A (3D03) 40081837-1 6/21/2010 0-SME-003.04 Attachment 3 NRC RAI No. 3 In the LAR, the licensee stated that the TS SR total battery connection resistance limit, derived from the summation of the individual battery inter-cell and transition connections resistance values for the respective battery, is enveloped by the battery load and voltage calculation.

Provide the excerpt from the battery load and voltage calculation which shows the total battery connection resistance limit considered in the calculation.

FPL Response:

The following excerpt is from Calculation PTN-BFJE-94-002 Rev. 7 Pages 5 and 6 which shows the total battery connection resistance limit is considered in the calculation "3.2.5 Battery Inter-cell Connections The battery vendor (GNB) performance data (fan curves) accounts for inter-cell connector resistance (i.e. cells are connected in series during testing), but the inter-cell connector resistance is not recorded during the testing (Ref, CR 2008-26488). This calculation conservatively assumes that the vendor inter-cell connections during testing are equivalent to the baseline resistance value for a new, clean, just torque connection established in PTN battery Procedures 0-SME-003.3 and 003.15. Thus only the margin in the Maintenance Limit Allowable Value that is above the baseline inter-cell connection values are considered not accounted for by the battery performance data fan curves and are being included in the calculation.

Turkey Point Units 3 and 4 L-2012-191 Docket Nos. 50-250 and 50-251 Enclosure Responses to Requests for Additional Information Page 4 of 5 Related to LAR 210, DC Sources Battery Inter-cell Connection additional resistance included in the calculation:

NCN- 17 Baseline Connections 5 gI-ohms NCN- 17 Transverse Brace 5 gI-ohms Cable Transition Connections (2) 125 jI-ohms 57 x 5 IA-ohms + 2 x 125 [t-ohms= 535 Ix-ohms 540 It-ohms of resistance added for battery Inter-cell connections NCN-25/27 Baseline (40) 6 ji-ohms NCN-25/27 Transverse Brace (16) 7 Ix-ohms Cable Transition Connections (3) 125 gt-ohms 40x 6 [L-ohms + 16 x7 gi-ohms + 3 ix-ohms x 125 = 727 p-ohms 730 j-ohms of resistance added for battery Inter-cell connections" NRC RAI No. 4 In the LAR, the licensee stated that the vendor's typical expected battery life curve indicates a 100%

battery capacity over the initial 14 years.

Provide the basis and any supporting documents to confirm the above statement.

FPL Response:

The "Typical Expected Battery Life" curve provided by Gould Inc. in 1975 (Attachment 3 to calculation PTN-BFJE-94-002 Rev.5 (See Attachment 2 of this Enclosure)) shows a battery capacity of 100% up to 14 years. From the 14 year mark the capacity of the batteries drop off steadily to approximately 80% capacity at the 20 year mark. Therefore, if a battery is expected to operate for a 20 year time period, then the battery would be designed with an Aging Factor of 1.25 (1 / 1.25 = .80) which would ensure that the battery would still cover 100% of the load after 20 years.

Note: The Aging Factor essentially sizes the battery a percentage higher than the required load of the system. Therefore, a 1.25 Aging Factor will initially size the battery to 120% of the required load.

Turkey Point Units 3 and 4 L-2012-191 Docket Nos. 50-250 and 50-251 Enclosure Responses to Requests for Additional Information Page 5 of 5 Related to LAR 210, DC Sources NRC RAI No. 5 In the LAR, the licensee stated that an aging factor of 1.15 (115%) essentially reduces the battery service life to 18.6 years during which time the battery would have sufficient capacity to provide 100% of the power requirements for the design load.

Provide the basis and summary of the supporting calculation to confirm the above statement.

FPL Response:

With an Aging Factor of 1.15 (1 / 1.15 = .867) the battery would degrade to 100% of the load after 18.6 years. This can also be seen on the "Typical Expected Battery Life" graph. With 100% of the designed load being at 86.7% of the battery capacity, the battery will only be able to supply the full load for 18.6 years. After this time period the capacity of the battery would no longer be capable of providing 100% of the load. (See Attachment 2 of this Enclosure)

Note: The ETAP program permits entry of an Aging Factor other than 1.25 into the analysis.

Therefore, when performing the calculation the Aging Factor can be reduced. For a given Aging Factor the program will calculate the required positive plates for the design load. The program then determines the battery discharge voltages based on the battery's end of life capacity (100% design load / 18.6 years). (Page 15 and 16 of Calculation PTN-BFJE-94-002 Rev.7) (See Attachment 3 of this Enclosure)

Turkey Point Units 3 and 4 L-2012-191 Docket Nos. 50-250 and 50-251 Attachment 1 Responses to Requests for Additional Information Related to LAR 210, DC Sources ATTACHMENT 1 Battery Surveillances Showing the Measured Resistance Values (11 pages)

Letter L-2012-191 EC 275971 Rev. 0 PTN-ENG-SEES-12-019 Rev 0 Page 1 of 11 Attachment I Page _L of i(

Procedure No.

4 TURKEY POINT PLANT SURVEILLANCE MAINTENANCE PROCEDURE 0-SME-003,04 Revision No.

FPL SAFETY RELATED 0

Title:

.125VDC STATION BATTERY REFUELING INTERVAL MAINTENANCE Responsible Department: ELECTRICAL MAINTENANCE Special Considerations:

This is an Upgraded Procedure. Initial use should include increased awareness because of potential technical and/or sequential changes to the procedure. After initial use of this procedure, provide comments back to the Procedure Upgrade Project.

FOR INFORMATION- ONLY Before use, verify revision and change documentation

'(if applicable) with a *otrolled index o"0 ent.

DATE VERIFIED W /. INITIAL-._"

Revision Approved By Approval Date UNIT #

DATE DOCT PROCEDURE 0 Lanny Smith 07/26/11 DOCN O-SME-003.04 SYS STATUS COMPLETED REV 0

1. OFPGS 10058622 01 EDMSDOC 2 13

Letter 2012-191 EC 275971 Rev. 0 Attachment 1 PTN-ENG-SEES-12-019 Rev 0 Page 2 of 11 Attachment )

Page Z of, It REVISION NO.: PROCEDURE TITLE: PAGE:

PROCEDURE0NO.: 125VDC STATION BATTERY REFUELING INTERVAL MAINTENANCE 76 of 114 0-SME-O03.04 TURKEY POINT PLANT ATTACHMENT 2 Cell Interconnection Resistance And Voltage Readings (Page 1 of 2) 2 Post Batteries Measure and record voltage from A to X Measure and record resistance from A ti C.

B C D

CA A4 post batteries Measure and recor 'cvoltag-e--ro r--A -OR--Bo x?

e*--sure and record resistance.-fom A toC Me ýrrFresistance fromn 'D6 0

• nd *a-n-d-

[0058622 01 EDMSDOC 2 88 1

Letter 2012-191 EC 275971 Rev. 0 Attachment 1 PTN-ENG-SEES-12-019 Rev 0 Page 3 of 11 Attachment I Page - of J REVISION NO.: PROCEDURE TITLE: PAGE:

0 125VDC STATION BATTERY REFUELING INTERVAL MAINTENANCE 77 of 114 PROCEDURE NO.:

0-SME-003.04 TURKEY POINT PLANT ATTACHMENT 2 Cell Interconnection Resistance And Voltage Readings (Page 2 of 2)

Base line is resistance expected on new, clean, just torqued, connections.

Maintenance limit is based on plus 20% or plus 5 p-ohms, which ever is greater.

NOTE 0 The transverse braces run front to back on the lower tier of two level racks.

To accommodate this brace, longer intercell connectors are used at these locations.

Transition Cables -.cables that run between racks or tiers to connect cells.

Maintenance Level Acceptance Criteria for intercell connectors.

Application Construction Baseline Maintenance Limit Acceptance Criteria 2-1/4" x 7.88" NCN-17 OR 19 to 24 29 4-1/8" x 7.88" NCN-17 2-114" x 8.38" 20 to 25 30 Transverse brace

-4 NCN-25/27 2-1/4" x 7.88" 24 to 29 35 NCN-25127 2-1/4'x8.38" 28to33 40 Transverse brace NCN-17/25/27 Transition Cables N N 1 All readings are p-ohms 10058622 01 EDMSDOC 2 89; 1

EC 275971 Rev. 0 Letter L-2012-191 PTN-ENG-SEES-12-019 Rev 0 Attachment 1 Attachment f Page 4 of 11

( Page + ofj1 acility PTN TURKEY POINT Work

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0 125VDC STATION BATTERY REFUELING INTERVAL 78 of 114 PROCEDURE NO.: MAINTENANCE 7 O-SME-003.04 TURKEY POINT PLANT ATTACHMENT 3 Connection Resistance Data (Page 1 of 1)

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3-4 33-34

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28-29 58-59 AS-29-30 59-60 Date/0/ *:*I/ 60 Bus Battery ID

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0 125VDC STATION BATTERY REFUELING INTERVAL PROCEDURE NO.: MAINTENANCE 78 of 114 O-SME-003.04 TURKEY POINT PLANT ATTACHMENT 3 Connection Resistance Data (Page 1 of 1)

INTERCELL Less Than Less INTERCELL ThanCONNECTLesTa Less Than CONNECT Maintenance Limit ID Maintenance Limit ID ID Bus-1 30-31 ,a, 1-2 -.-f. 31-32 .. L 2-3 .23 -4e- 32-33 .20 AL 3-4 * .- "4c- 33-34 49..,-..

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5-6 ZO A ,44 35-36 .1 -,

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9-10 /9 , 39-40 /7 e,.

10-11 .- ,k 40-41 -Y_4c, 11-12 ,o . 41-42 A7A 12-13 ,1.3 . 42-43 1,. 4.

13-14 1a. At, 43-44 .AO 44_

14-15 -Z.9 '. 44-45 __S 4_

15-16 .1 At 45-46 /,AL 16-17 J3 A 46-47 ,t AL 17-18 .3 47-48 18-19 a-q A 48-49 Al-19-20 .2 7 4 49-50 OZA At

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Letter 2012-191 EC 275971 Rev. 0 PTN-ENG-SEES-12-019 Rev 0 Attachment 1 Attachment I Page 9 of 11 Page Iof It ATTACHMENT 10 ,/v CA -/7 (Page 4 of 30) Date _______

Battery ID 1_ n DATA SHEET 4-4 Table* 3 Less Than Less Than INTERCELL MAintenance Limit INTERCELL Maintenance Linit CONNECT (Att. 4, Pg 2) CONNECT (AUt. 4, Pg 2)

ID As Found ID As Found 6.3.2. 6.3.2 Bus-1. 13 30-31 2 y_  ! .

1-2 __ __ _ 31-32 2,5 2-3 6 32-33 z__

3-4 I I 33-34 "2 -7 4-5 34-35 ____Z..__

5-6 35-36 ___

6-7 " "7 36-37 2 !57 7-8 2,.5 37-38 ___

8-9 z o 38-39 9-10 39-40 10-11 40-41 11-12 41-42 ZJ 12-13 ___ _" 42-43 .2- Y7 13-.14 43-44 14-15 44-45 i/

15-16 2, 45-46 _____

16-17 l. 4647 2 17-18 7-_ 4748 18-19 *jj 4849 19-20 r7 49-50 20-21 50-51 i __

21-22 51-52 Z_

.22-23 52-53 .

23-24 1_ 53-54 2q 24-25 :z 54-55 '_ _

25-26 a- 55-56 3 26-27 -z Is 56-57 2 (

27-28 2 57-58 2t -

28-29  ?._ __. 58-59 I9 29-30 2,-5 59-60 '2_

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Facuilty PTN TURKEY POINT Work Order Package Planner N363809 BAUGHER DANIEL A UNIT 40081837 01

[ask Title  : T.S. 3A BATT. SERVICE FACTOR DUPLICATE TEST 03 ask Dspln : ELEC Ref :

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Name  : 125 VDC 1800 AMP/HR (3A) STA ON BATTERY Equip Tag  : 3D03 Alto  :

Work Item  : E t Li t  : 1600008501 000 UTC :t 6Id : UCR  : ALL TPFS 3003-AB03 age"  : Work Week  :

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REVISION NO.: PROCEDURE TITLE: PAGE:

0 125VDC STATION BATTERY REFUELING INTERVAL 78 114 PROCEDURE NO.:

MAINTENANCE 0-SME-003.04 TURKEY POINT PLANT 1 ATTACHMENT 3 pc.p-a(

Connection Resistance Data (Page 1 of 1)

INTERCELL Less Than INTERCELL Less Than CONNECT ID CONNECT Maintenance Limit C IDN Maintenance Limit ID Bus-1 /3 A. 30-31 7a ,.

1-2 Zq14 31-32  ?-5" ^

2-3 z2- A. 32-33 Z6 /j 3-4 Z-(f 33-34 ZA A 4-5 A 34-35 L3 A 5-6 J- -y 35-36 Z6 A4 6-7 9-3 36-37 Z-i AL 7 ,4 37-38  ?.q A 8-9 38-39 z" A 9-10 ,. 39-40 Z_-3Ak 10-11 pt 7 40-41 . A 11-12 zs- 41-42  ?-(aA 12-13 X-7 42-43 . At 4

13-14 A6& 43-44Z.

14-15 za_._ 44-45 z:"r 15-16 43A ci,&,' 45-46 (o ,,

16-17 Aa 46-47 Z-Z.A.

17-18 -.Z-7 47-48 Z3 A.

18-19 t? 48-49 2 q 19-20 __" 49-50 A.

A-6 20-21 . 50-51 .1 A 21-22 ,A.6 51-52 2.?_.-k_.

22-23 A-7 52-53 277 ,4 23-24 Z7 53-54 7-5" A 24-25 54-55 4- /

25-26 55-56 2- 7 ,,A.

26-27 __56-57 Z.5 -A 27-28 .26 57-58 P5' A 28-29 X7" 58-59 7- .A-29-30

• 9 59-60 7-.

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Battery ID

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Turkey Point Units 3 and 4 L-2012-191 Docket Nos. 50-250 and 50-251 Attachment 2 Responses to Requests for Additional Information Related to LAR 210, DC Sources ATTACHMENT 2 Gould Battery Graph - Percent Capacity verses Years (1 page)

EC 275971 Rev. 0 Letter 2012-191 PTN-ENG-SEES-12-01 Rev 0 9

ttachment Page 1 of 1 2 Attachment 2.

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Turkey Point Units 3 and 4 L-2012-191 Docket Nos. 50-250 and 50-251 Attachment 3 Responses to Requests for Additional Information Related to LAR 210, DC Sources ATTACHMENT 3 PTN-BFJE-94-002 Rev. 7, Pages 15 and 16 (2 pages)

Letter 2012-191 . EC 275971 Rev. 0 Attachment 3 PTN-ENG-SEES-12-019 Rev 0 Page 1 of 2 Attachment 3

. FPL Florida Power & Li ht I PTN-BFJE-94-002 Calculation No.

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5. Analytical Calculation All Battery Sizing and Discharge computations for this calculation have been performed by the ETAP program. The results are contained in Attachments 7 through 18.

5.1. Battery Sizing 5.1.1. Normal Battery with 60 Cells Battery sizes were computed for each of the Safety-Related batteries with 60 cells. See Attachments 7 through 10 for ETAP calculations.

Battery Computed Aging Computed Total Acceptance Uncorrected Factor Correction Required Criteria Positive Factor Positive (Pos Plates)

Plates Plates 3A 7.458 1.25 1.438 10.724 12 3B - 4.436 1.25 1.438 6.378 8 4A 4.872 1.25 1.438 7.005 8 4B1 8.703 1.19 1.369 11.913 12

• Table 5.1.1 I

• Per Reference 2.24, an Aging Factor of 1.19 corresponds to approximately 19.2 years of cell life.

5.1.2. Spare Battery with 60 Cells Battery sizes were computed for the Safety-Related spare battery when feeding each of the Safety-Related 125V buses (each bus fed individually). See Attachments 15 through 18 for ETAP calculations.

Battery Computed Aging Computed Total Acceptance Uncorrected Factor Correction Required Criteria Positive Factor Positive (Pos Plates)

Plates Plates 3A 8.388 1.25 1.450 12.162 13 3B 5.177 1.25 1.450 7.505 13 4A 6.582 1.25 1.450 9.542 13 4B 9.563 1.15 1.334 12.756 13

• Table 5.1.3

• Per Reference 2.24, an Aging Factor of .1.15 corresponds to approximately 18.6 years of cell life.

5.2. Battery Discharge 5.2.1. Normal Battery with 60 Cells Battery Discharge voltages for each Safety-Related battery with 60 cells are given below. The table includes the calculated minimum battery terminal voltage and the worst-case inverter terminal voltage. The time in which the voltage occurred is identified in minutes after event initiation. See Attachments 11 through 14 for the discharge data.

Letter 2012-191 EC 275971 Rev. 0 Attachment 3 PTN-ENG-SEES-12-019 Rev 0 Page 2 of 2 Attachment "3 Page Z ofZ_

@FPL I PTN-BFJE-94-002 7 Page 16 of 21 1

I E Florida Power & ighti Calculation No. Revision -

Device Voltage Minute Acceptance Notes Criteria Battery 3A 108.3 119 > 105V Aging factor of 1.25 INV 3YO1 105.4 1 > 103V Aging factor of 1.25 Battery 3B 109.2 1 > 105.6V Aging factor of 1.25 INV 4Y05 105.7 1 k 103V Aging factor of 1.25 Battery 4A 107.0 1 > 105V Aging factor of 1.25 INV 3Y07 104.2 1 i 103V Aging factor of 1.25 Battery 4B 105.3 119 >105V Aging factor of 1.19 INV 4YO2 103.3 119 a 103V Aging factor of .19 Table 5.2.1 5.2.2. Spare Battery with 60 Cells Battery Discharge voltages for the Spare Battery connected to each of the Safety-Related buses with 60 cells are given below. The table includes the calculated minimum battery terminal voltage and the worst-case inverter terminal voltage. The time at which the voltage occurred is identified in minutes after event initiation. See Attachments 11 through 14 for discharge data.

Device Voltage Minute Acceptance Notes Criteria Spare for Batt 3A 108.9 1 Ž: 108.6V Aging factor of 1.25 INV 3Y01 104.4 1 > 103V Aging factor of 1.25 Spare for Batt 3B 113.3 1 Ž 108.6V Aging factor of 1.25 INV 4Y05 109.2 1 > 103V Aging factor of 1.25 Spare for Batt 4A 111.2 1 > 108.6V Aging factor of 1.25 INV 3YO7 107.1 1 > 103V Aging factor of 1.25 Spare for Batt 4B 108.7 119 Ž 108.6V Aging factor of 1.15 INV 4Y02 105.7 1 > 103V Aging factor of 1.15 Table 5.2.3 5.3. Battery Charger Sizing There are two battery chargers per Safety-Related bus. The current rating of each battery charger supporting buses 3D01/3DO1A (Battery 3A) and 4D01/4DO1A (Battery 4B) is 400A (Reference 2.6.9). Each battery charger supporting buses 3D23/3D23A (Battery 3B) and 4D23/4D23A (Battery 4A) has a rating of 300A. For the 400A chargers, each bus will be analyzed separately. For the 300A chargers, an enveloping battery charger analysis is completed.

5.3.1. Chargers supporting 3D01/3DOIA (Battery 3A)

Load current values for each time period are taken from Attachment 5. Attachment 5 values are used in lieu of the ETAP output reports in Attachment 7, as ETAP-computed currents contain adjustments for voltage. This load profile will be used to evaluate the two 400A battery chargers (Reference 2.6.9) connected to 3D01/3DOIA.

Based on the load profile in Attachment 5, the AH are calculated as follows: