ML20126G747

Forwards Info Re Battery Load Profiles & Voltage Drop Calculations,Initially Provided During 921208 Telcon

ML20126G747
Person / Time
Site:	Grand Gulf
Issue date:	12/23/1992
From:	Cottle W ENTERGY OPERATIONS, INC.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GNRO-92-00153, GNRO-92-153, NUDOCS 9301040217
Download: ML20126G747 (20)

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6 Dec ernbe r 23, 1992 U.S. Nuclear Ro0ulatory Commission Mail Station P1 137 Washington, D.C. 20555 Attention:

Document Control Desk

Subject:

Grand Gulf Nuclear Station Unit 1 Docket No. 50 410 Licenso No NPF 29 Battery Load Profilos and Volta 00 Drop Calculations Transmittal of Information Provided as Part of the Tolophone Conversation on December 8,1992 GNRO 92/00153 Gentlemen:

Entergy Operations, Inc. by this letter is submitting infortnation concerning the battery load profilos and voltago drop calculations which was provided to the staff durin0 a tolophone conferenco on Docornber 8,1992. Tho information transmitted to you in this letter is the infortnation provided either verbally durin0 the conference or provided by f acsimilo prior to the conference. The information sont by f acsimilo prior to the conference provided in this letter has boon editorially revisod for clarity.

Yours truly, w s-~ cm.x c -

WTC/BSF attachment: Information provided durin0 the conference call on December 8,1992 cc:

(Soo Next Pa00) 0400Gv l

l 9301040217 921223

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i December 23, 1992 GNRO 92/00153 Pago 2 of 3 cc:

' Mr. R. H. Bernhard (w/a)

Mr. D. C. Hintz (w/a)

Mr. R. B. McGohee (w/a)

Mr. N. S. Reynolds (w/a)

Mr. H. L Thomas (w/o)

Mr. Stewart D. Ebnoter (w/a)

Regional Administrator U.S. Nuclear Regulatory Commission Rogion 11 101 Mariotta St., N.W., Suite 2900 Atlanta, Georgia 30323 f5r. P.' W. O'Connor, Project Manager (w/2)

Offico of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 13H3 Washington, D.C. 20555

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4 December 23. 1992 GNRO 92/00153 Page 3 of 3

- bec:

Mr. C. A. Bottomiller (w/a)

Mr. R. W. Byrd (w/al' Mr. L. F. Daughtery (w/a)

Mr. M. A. Dietrich (w/a)

Mr. B. S. Ford (w/a)

Mr. J. O. Fowler (w/a) 3 Mr. C. C. Hayes, Jr. (w/a)

Mr. C. R. Hutchinson (w/a)

Ms. F. K. Mangan (w/o)

Mr. J. R. McGaha (w/a) i Mr. M. J. Meisner (w/o)

Mr. D. L. Pace (w/a)

Mr. G. A. Zinke (w/a) i File (LCTS) (w/a).

j File (Hard Copy) (w/a)

File (RPTS) (w/a)

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File (NS&RA) (w/a)

File (Central) (w/a) (20) s 1

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Attachment to GNRO 92/00153 Page 1 of 17 ITEM 1 The load profiles used in the voltage drop calculations are the load profiles developed in the associated battery sizing calculations. See Attachment I sheet 1 in the battery sizing calculations and compare them to Attachment XVI sheet 2 (DIV l} or Attachment X sheet 2 (DIV II) of the voltage drop calculations. The load profiles (Attachment I sheet 1 of the sizing calculations) were used as discussed in IEEE 485 to determine the loads used in the battery sizing work sheets (Attachment IV).

ITEM 2 The items identified by node number in this question are attached. These items are justified in the calculations either by:

1.

comparing the time during which the item is identified in the voltage drop calculatior' not to receive the manufacturer's minimum voltage to the time the item is identified to be energized by the battery sizing calculation, or 2.

the component is explicitly identified in the voltage drop calculation not to be energized during the time period in question.

The calculation node numbers for the tables of components supplied in our August 13,1992 letter (GNRO 92/00107) are attached, llUdl The safety related battery chargers remain connected to the bus during a loss of power event and are, therefore, available whenever there is power to the safety related bus, ITEM 4 The test equipment could not simulate the time intervals used in the voltage drop calculations and battery sizing calculations for the load profiles, therefore, the load profiles placed in the UFSAR are for longer time intervals. The profiles in the UFSAR are more conservative during all time frames. The profiles in the UFSAR bound the highest postulated amperage requirements and the highest assumed battery voltages during each time interval assumed !n the battery sizing and voltage drop calculations.

The following information is provided in response to your question during the telephone conference concerning the voltage drop calculation's lumped case T5 (21.395 to.105 seconds) and how the UFSAR's load profile bounds this interval.

The battery load profile (discussed in item 1 above) was developed from the battery duty cycle which was determined for a discrete sequence of loads. To reduce the number of required calculational computer runs performed as part of the voltage drop study, lumped cases were developed which included multiple time frames of the battery load profile. For voltage drop considerations, these lumped '

- cases (T1 though T7 for Division 1) conservatively assumed energized all of the loads identified by the.-

battery load profile / duty cycle to be energized at any time during the lumped case time frame; These lumped cases of the voltage drop ralculations verified component operability under more severe voltage

- drop conditions than would be imposed if the actual battery lead profile /dutv cycle was evaluated.-

Therefore,. when the voltage drop study indicated that during these lumped cases the essential

- components received their required manufacturer's minimum voltage, the components' operability w1s assured during the actual battery load profile / duty cycle. The time frames for the service test provided in,the. UFSAR were also. developed as lumped cases-to conservatively bound the battery-load -

profile / duty cycle for the amperage requirements and the voltage drop calculation for the associated minimum acceptable terminal voltage. These lumped cases were developed because the test.

equipment could not simulate the time inters als used in the voltage drop calculations and battery sizing calculations for the load profiles, therefore, the load profiles placed in the UFSAR are for longer time intervals. The profiles in the UFSAR are more conservative during all time frames. The profiles in the

OFSAR bound tho highest postulated amperage requirements and the highest assumed battery voltages :

during each time interval assumed in the battery sizing and voltage drop calculations.

- Attachtnent to GNRO 92/00163 Paos 2 of 17-lTEMS 6 THROUGH 9 Additional clarifying statements which will be added to the next revision of the UFSAR are attached.

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'i Division i 1129 0901 Close coil 1 AS 00 E1182 00 LPCS Pump f

Fails 6 to 11 second lurnped case (Attachmont II) but passes during 0.395 to 0.49 secund case (Attachment IV) when devke is reouired as identified in the battery sizing calculation (Category 19 load),

i 4710 1001 Close coit 1853 04 E1257-07 Enclosure Building Recirculation Fan

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Fails 11 to 10 second lumped case (Attachment V) but passes during 11.39 to 11.49 second case (Attachment VI) when device is required as identified in the battery 5; ring calculation (Category 21 loadh 4717 0203 Close coil 1053 00 Battery Charger IDAS Not energized during the 11 to 10 second case (Attachment V) which it fallsc l

Passes in 239 to 240 minute case (Attachment XIV) when dev!ce is required as identified in the battery sizing calculation (Category 40 load). Note: This is the assumed reconnection of one of the two safety related battery chargers which were postulated to be Out of Service to make the reviewed event happt.n.

I 5302 0701 Series Field E51 F013 A E1185-02 Passes for the applicable attributes during 11 to 10 second time frame and 16 to 105 second time frame (Attachments V, VI, Vil, Vlli, IX, x, and XI) when device is required as identified in the battery sizing calculation (Categories 34, 348,39, and 39a). Fails 11 to 10 second lumped case (Attachment V) for the attribute associated with 30a and 34a Categories (steady state current) which la not applicable during this time frame (Category 34 inrush current is applicable).. Note: The battery sizing calculation incorrectly identifies this as ~

component 5301 0701.

1101-0503 Close coil 1 A5 03 E1225 03 SSW pump j

Fails 16 to 21.395 second lumped case (Attachment Vill) but passes 16.39 to -

10.49 se:ond case (Attachment IX) when device is required as identified in the l

battery sizing calculation (Category 23 load).

}

4115-0701 Close coit 1851 06 EDG OA Fan E 1265+i2 Fails 10 to 21.395 second lumped case (Attachment Vill) but passes 10.39 to 10.49 second case (Attr.chment IX) when device is required as identified in the i

battery sizing calculation (Category 23 load).

1201-0203 27 Relay (27-6?) (1856-01) E1115 0615 BAS Load Center Feeder Breaker Fails 21.395 to'105 second case (A+tachment X) during which the device is -

deenergized. Passes 0 to 6.395 second time frame (Attachment 1,~ lls and lil)-

when device is required as identified in the battery sizing calculation (Category-7loadh

-1201 0204 27X Relay (1855-01) E1115 0615BA5 Load Center Feeder Breaker 1 Fails 21.395 to 105 second case (Attachment X) during which the device is -

-deenergized. Passes 0 to 6.395 second time frame (Attachment I,11, and Ill).

3 when device is required as identified in the battery sizing calculation (Category

-7 load).

1212-0204 Close Coil 1855 05 E11151215B42 Motor Control Center Feeder Breaker.

i Fails 21.395 to 105 second lumped case (Attachn ent X) but passes 21.395:

l to 21.49 second case (Attachment XI) when device is required as identified in.

the battery sizing calculation (Category 25 load).

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Attachment to ONRO 92/00153 Page 4 of 17 Division I (continue @

1219 0204 Close Coll 1855 00 E1225 04 SSW cooling tower fan C003A Falls 21.395 to 105 second lumped case (Attachment X) but passes 21.395 to 21.49 second case (Attachment XI) when device is required as identified in

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the battery sizing calculation (Category 25 load).

t DiYitigILU 2000 0501 R8 P42 E 1220 003 CCW Pump Emergency Trip Relay Energized 0 to 0.395 seconds (Attachment l) passes Deenergized 11.395 to 10.49 seconds (Attachment 110 falls i

2011-0501 Close coil T48 E 1257 007 Enclosure Building Recirculation Fan Dreaker i

Energized 0.395 to 11.395 seconds (Attachment II) passes Deenergized 11.395 to 10.49 seconds (Attachment Ill) fe!!s 1900 0501 wose coil X77 E 1205 002 EDG Room O/A Fan Dreaker Energized 11.395 to 10.49 seconds (Attachment lil) passes

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Deonergized 10.49 to 18.49 seconds (Attachment IV) falls 2112 0202 Relay 27 02/10B05 R20 E 1110-00 Load Center 10B05 Undervoltvoe Relay r

Energized 0 to 0.395 seconds (Attachment 1) + passes Deenergized 21.49 to 30.095 seconds (Attachment VI) f ails 2112 0203 Relay 27X/100B5 R20 E 1110 00 Load Center 100B5 Undervoltage Auxiliary Relay L

Energized 0 to 0.395 seconds (Attachment 1) passes _

i 2102 0203 Close coil P41 E 1225 03 $SW cooling tower fan breaker Doenergized 21.49 to 30.095 seconds (Attachment VI) f ails i

Energlied 10.49 to 21.49 seconds (Attachment V)- passes Deenergized 21;49 to 30,095 seconds (Attachment VI) < falls 2107 0203 Close coil P41 E 1225 03 SSW cooling tower fan breaker

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Energized 18.49 to 21.49 seconds (Attachment V) i passes Deenergized 21.49 to 30.095 seconds (Attachment VI) fails 1700-1301 Close coi! E01 E 118011 Drywell purge compressor breaker Energirod 21.49 to 30.095 seconds (Attachment VI) passes Deonergized 30.095 seconds to 240 minutes (Attachment Vil) falls 1707 2201

.R53 E01 E 118011 Drywell purge compressor Auxiliary Relay Energized 0 to 0.395 seconds (Attachment 11 passes Energized 0.395 to 11.395 seconds (Attachment 11) passes -

- i Energized 11.395 to.10,49 seconds (Attachment Ill) t passes Energized 10.49 to 18.49 seconds (Attachment IV) passes ~

Energized 18.49 to 21.49 seconds (Attrichment V) passes Energized 21.49 to 30.095 seconds (Attachment VD passes Doonergized 30,095 seconds to'240 minutes (Attachment VIO faits.

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i Attachment to GNRO 92/00153 Page 5 of 17 i

GNRO 92/00107 TABLE 1 i

Calculation -

Component Function Node Number DIVISION 1 1311 2101 Breaker 152 1508 Diesel Generator Feeder Breaker to 41.00 V Switchgear Bus

-f Close Coll 15AA 1142 1701 Breaker 152 1509 Residual Heat Removal Pump Motor A Feeder Breaker Close Coil 4111 1301 Breaker 152 1505 Drywell Purge Compressor A Feec.er Breaker Close Coil 1003 2401 MOV 1E51F045 Contactor energizes the RCIC Steam to Turbine MOV i

72F Contactor Actuator to open the 1E51F045 valve 5303 2101 MOV 1E51F013 Contactor energizes the RCIC Injection Shutoff MOV Actuator

'~a 72F Contactor to open valve 1E51F013 when valve IEB1F045 opens 5308 2101 MOV IE51F013 Contactor energizes the RCIC injection Shutoff MOV Actua' tor 72R Contactor to close valve 1E51F013 when valve 1E51F045 or the trip-valve closes DIVISION 11 f

1208 1001 Breaker 152 1608 Diesel Generator Feeder Breaker to 4100 V Switchgear Bus-Close Coil 10AB D

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Attachment to GNRO 92/00153 Pago 0 of 17 QEDD;92/00107 TABLE.2 Calculation Conmonont function Node Number DIVISION I 1103 1801 Relay R3D Standby Service Water (SSW) Pump Feodor Dreaker Control

'4112 2401 ficlay R52 Drywell Purge Compressor Manual and Compressor Protectivo Top Relay 4711 1301 Relay 021 Enclosure Building Recirculation Fan Feodor Breaker Control' 1202 0701 Relay 74 0 Load Conter ISBAS 480 V Feode' Dreaker 1.oss of Control (R20)

Power Indication 1213 2001 Relay R41 SSW Cooling Tower Fan A Feeder Dreaker Alarm and-Control 1220 2001 Relay R42 SSW Cooling Tower Fan D Feodor Breaker Alarm and Control DIVISION 11 2104 1201 Relay R43 SSW Cooling Tower Fan C Feeder Breaker Alarm and Control 2109 1201 Relay R44 SSW Cooling Tower Fan D Feeder Dreaker Alarm and -

Control 2102-0202 Relay 74 5 SSW Cooling Tower Fan C Feodor Dreaker Loss of Control Power 2107 0202 Rolay 74 0 SSW Cooling Tower Fan D Feodor Dreaker Loss of Control (P41)-

- Power 2112 0205 Relay 74 0 Load Center 10005 4100 V Feeder Breaker Loss of Control (R20)

Power Indication 2112 0204 Relay 74 22 Load Center 10B05 4100 V Feodor Breaker Undervoltage Circuit loss of Control Power Indication!-

2207 0201 Relay 7412 Load Contor 10004 480 V' Feodor Breaker to Motor Control Center (MCC) 10B42 Loss of Control Power Indication -

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' Attachment to GNRO 92/00153 Page 7'of 17--

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' QNRO 92/00107 TABLE.1-Chiculatton Component

. Function i

Node Nurnber DIVISION 1 1310 1001 Relay R0 Diesel Generator (ESF Bus 15AA) 13reaker: Providos Annunciation of EDG Breaker Automatic Trip 3000-0910 Relay K47A Permissive for transfer of Hecirculation Pump to Low Speed l

1101-0503 Breaker 152 1503

.SSW Pump A Feeder Dreaker 1

Spring Charging f

Motor -

1212 0201 Dreaker 152 15505 SSW Cooling Tower Fan A Feeder Brdaker i

Spring Charging

. Motor l

1215 1801 Relay 02-5 Permissive for Annunciation of SSW Cooling Tower Fan A Feeder Breaker T Ip

. t 1212-0202 Relay R80 SSW Cooling Tower Fan A Feeder Breaker Test Indication r

1219 0201 Breaker 152 15500 SSW Cooling Tower Fan 8 Feeder Breaker Spring Charging

- Motor

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1220 1801 Relay 02 0 Permissive for Annunciation of SSW Cooling Tower Fan B Feeder Breaker Trip-1219 0202 Relay R87 SSW Cooling Tower Fan B Feeder Breaker Test-Indication 3

~ I'd10502 Greaker 152 1609 Residual Heat Demoval (RHR) Pump A Feeder Dreaker-Spring Cnarging Motor-4110-0201 Dresker 152 15105 Drywell Purge Compressor A Feeder Dreaker -

Spring Charging.

Motor 2414 0401 Solenoid RCIC Trip and Throttle Valve Trip Coli

. TD1E511C002

- 4114 0202-Breaker-15215100 Diesel Generator Room Outside Air Ti A Feeder

. Spring Charging

-Breaker-Motor.

4709-0201 Breaker 152 15304

' Enclosure Building Fon A Feeder Breaker

' Spring Charging-Motor -

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QBRO 92/00107 TABLE 3 (continued)

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I Calculation Component function i

Node Number

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DIVISION ll 1208 1301 Relay R0 Diesel Generator (ESF Bus 1 GAD) Breaker: Provides l

Annunciation of EDG Breaker Automatic Trip 3003 0701 Relay K478 Permissive for transfer of Recirculation Pump to 1.ow-I Speed 2002 0501 Relay 03X N025 Component Cooling Water (CCW) controllogic low system pressure signal 2102 0201 Breaker 52 16505 SSW Cooling Tower Fan C Spring Charging i

Motor 2105 1201 Relay 02 7 Permis:lve for Annunciation of SSW Cooling Tower

' Fan C Feeder Breaker Trip--

1 2107 0201 Breaker 5210500 SSW Cooling Tower Fan D.

l Spring Charging i

Motor

.i 2110 1201 Relay 02 8 Perrnissive for Annunciation of SSW Cooling Tower i

Fan D Feeder Breaker Trip 1905 0202 Breaker 52 16104 Diesel Generator Room Outside Air Fan B Feedero Spring Charging Breaker l

i Motor 2010-0201 Breaker 52 16304 Enclosure Building Fan B Spring Charging Motor o

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DIVISIDH I BATTERY LOAD PROFII.E CAso Number.

Timg.,, Peri od Peak current (Al 1

0 to 0.025 sec 280.06 0,025 to 0.035 sec 268.36 3

0.035 to 0.05 sec gg g g 258.36 e

0.05 to 1.0 bec 242.36 5

1.0 to 3.9 sec D~2"

• 316.49 6

3,9 to 5.0 sec W3A 314,o1 7

d.0 to 5.25 sec 242.98 8

U.211 to 6.0 sec 168.98 9

S.0 to 6.3 suc 376.29 10 6.3 to 6.395 soc 385.47 Ote 2oSu+

11 6.395 to 6.49 see 140.23__/9"W 12 6449 to 7.0 sec 1492. 2JJ' -

13 7.0 to 8.395 sec 06.13 14 8.395 to 8.49 sec 429.13 15 8.49 to 11.0 sec 372.17 16 11.0 to 11.39 sec 363.42 17 11.39 to 11.49 sac 370.44 18 11.49 to 13.49 sac 478.68 19 13.49 to 16.0 sec 3C4.68 20 1.6.0 to 16.395 sec 268.27 21 16.395 to 16.49 sec 296.47 22 16.49 to 17.0 sec 460.53 23 17.0 to 18.49 sec. 421.38 24

18. 49 to 21. 395 nec 250.38 25 21.395 to 21.49 sec

{365.81[ gL*,"

253.33 ***

26 21.49 to 23.49 sec p.K gygg e, 27 23.49 to 26.0 sec 251.81 28 26.0 to 27.0 sec

• [ [ 230.43 29 27.0 to 30.0 sec 246.45 3g,3 30 30.0 to 30.095 sec 248.28 31 30.095 to 31.0 sec 304.52

'32 31.0 to 32.095 sec 265.76 33 32.095 to 33.0..sec 208.76' t

34 33.0 to 34.0 sec 177.11 35 34.0 to 39.0 sec 269.23 36 39.0 tn 50.0 unc 192.82 37 50.0 to 105 sec-169.69 38 105 nec to 10 min.

uFSAR 169.91 J9 10 to 30 min ig4[

170.26 g %23'tJn.h 40 30 to 60 min 170.31

,,7 g g f gg 41 60 *- 239 min ll?_0_. 3 N

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42 23f co 239.083 min gpgg

'187.71 43 239.083 to 239.333 172.63 2 I194.17/.7%4 240 44 239.333.to 239.417

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45 239.417 to 239.998 176.16 P80 239.998 to 240 min,, gg4 46 176.92 l

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Battery Terminal Voltage paso Number Time Period Peak Current (A) 1 0 to 0.025 sec 280.06 2

0.025 to 0.035 sec 268.36 3

0.035 to 0.05 sec 258.36 4

0.05 to 1.0 sec 242.36 5

1.0 to 3.9 soc 316.49

^

6 3.9 to 5.0 sec 314.01 7

5.0 to 5.25 sec 242.98 8

5.25 to 6.0 soc 168.98 9

6.0 to 6.3 sec 376.29 10 6.3 to 6.395 sac 385.47 11 6.395 to 6.49 sac 440.23 12 6.49 to 7.0 sec 492.23 13 7.0 to 8.395 sec 486.13.

14 8.395 to 8.49 sec 429.13 15 8.49 to 11.0 sec 372.17 16 11.0 to 11.39 soc 363.42 17 11.39 to 11.49 soc 370.44 18 11.49 to 13.49 sec 478.68 19 13.49 to 16.0 roc 364.68 20 16.0 to 16.395 sec 288.27 21

16. 395 to 16.49 soc 296.47 22 16.49 to 17.0 sec 460.53 23 17.0 to 18.49 soc 421.38 24 18.49 to 21.395 soc 250.38 25 21.395 to 21.49 soc 253.33 26 21.49 to 23.49 sec 365.81-27 23.49 to 26.0 soc 251.81 28 26.0 to 27.0 sec. 230.43 29 27.0 to 30.0-soc 246.45 30 30.0 to 30.095 sec 248.28 31 30.095 to 31.0 sec 304.52 32 31.0 to 32.095 sec 265.76-

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33 32,095 to 33.0 sec 208.76 34 33.0 to 34.0 sec 177.11 35 34.0 to 39.0. soc 269.23 36 39.0 to 50.0 sec 192.82 37 50.0'to 105 sec 169.69 38 105 sec to 10' min 169.91 39 10 to 30 min 170.26 40 30 to.60 min 170.31' 41

.60..to 239 min 170.37 42 239 to.239.083 min 187.71 43 239 033,to 239.333 172.63 4r 239.333 to 239.417 194.17 45 239.417 to 239.99B' 176.16-46-239.998 to 240. min.

176 92 T

GG UFSAR TABLE 8.3-6 125 V DC BATTERY A (DIV 1)

Asperage Requirements and Minimum Battery Terminal Voltages Per Time Interval After AC Power Loss

-O to 20 sec 20'see to 1 min 1 to 239 nin 239 to 240 min 493 A 366 A 171 A 195 A 115.2 volts 115.2 volts

-115.2 volts 115.2 volta e

Minimum Sattery Terminal Voltage during the 6 to 20 second time interval may dip to 114 volts.

DESCRIPTION OF LOADS b

The asperage requirements for each time interval bounds the amperage required by the emergency loads that are required to operate during the given interval following the loss of AC power and the 9

'follure of both associated battery chargers. The minimuis battery terminal voltages are based on h

battery response derived from discharge characteristics and the values bound the DC system J

component regnirements.

3 Thz mejor loads on the battery are the following:

J Stendby Core Cooling Equ#pment a.

Primary Rt. lief Valves-b.

RCIC Control system O

c.

RCIC Isolat. ion Valves O

d.

RCIC Turbine Trip c.

RHR Control.

3 f.

LPCS Control Ap

'Dioscl Generator Field Flashing Emergency Lighting

.E Indicator Lamps & Armunciators Q

ESF Support System Control p

Reactor Protection System g

Load Sequencing Control

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Soismic Instrumentation U

Switchgear Uninterruptable Power Supplies i

LP Rev. 7 12/92 0

smuump C

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3 DIVISION Il DATTERY LOAD PROFILE I

Case Numb _,qr Time Period Peak Current (A) 218.641 1

0 to 0.025 sec 2

0.025 to 0.035 sec 205.941 3

0.035 to 0.05 sec 170.901 4

0.05 to 1.0 sec 157.941 5

1.0 to 3.9 sec uFSAA 232.065 6

3.9 to 5.25 sec o w 3o 230.103 7

5.25 to 6.0 sec

<uon.b 156.103 8

6.0 to 6.3 sec 3pgg 156.046 9

6.3 to 6.395 sec 164.223 10 6.395 to 6.49 sec 220.075 11

6. 4 9 to 8. 395 r.ec 272.075 12 8.395 to 8.49 acc 215.075 13 8.49 to 11.0.sec 158.076 14 11.0 to 11.395 sec 157.755 15 11.395 to 11.49 see 164.765 16 11.49 to 13.49 sec 264.765 17 13.49 to 16.395 sec 159.013 0 4* 3 " '*""y 18 16.395 to 16.49 sec 166.789 19 16.49 to 18.49 sec D 24. 270/

P A 20 18.49 to 20.0 sec 160.269 21 20.0 to 21.395 sec 160.080 22 21.395 to 21.49 sec 163.450 23 21.49 to 23.49 soc 236.214 24 23.49 to 30.0 cec 162.614 26 30.095 to 32.095 sec yjn 4' C 2 87'3o 4. C.o sw 25 30.0 to 30.095 cac 164.608 f**%

27

32. 095. tx) 105 sec 219 A 163.928 28 105 see to 10 min.

166.532-29 10 tu) 30 min u r5 A f(

166.931 30 30 to 60 min 14 34o 166.988 31 60 to 239 min mlnd e.5 167.045 g h;g.to r dok 32 239 to 240 min l(,2 A 1167.1211 psto k, i

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Battery Terminal voltage Case fiumber Time Period Peak Current (A) 1 0 to 0.025 sec 218.641 2

0.025 to 0.035 sec 205.941 3

0.035 to 0.05 sec 170.901 4

0.05 to 1.0 sec 157.941 5

1.0 to 3.9 sec 232.065 i

6 3.9 to 5.25 sec 230.103 I

7 5.25 to 6.0 soc 156.103 8

6.0 to 6.3 sac 156.046 9

6.3 to 6.395 sec 164.223 10 6.395 to 6.49 soc 220.075 11 6.49 to 8.395 ecc 272.075 12 8.395 to 8.49 suc 215.075 13 8.49 to 11.0 soc 158.076 14 11.0 to 11.395 sec 157.755 15 11.395 to 11.49 sec 164.765 16 11.49 to 13.49 sac 264.765 17 13.49 to 16.395 sec 159.013 18 16.395 to 16.49 sec 166.789 19 16.49 to 18.49 sec 324.270 20 18.49 to 20.0 soc 160.269 21 20.0 to 21.395 sec 160.080 22 21.395 to 21.49 sec 163.450 23 21 49 to 23.49 sec 236.214' 24 23.49 to 30.0 sec 162.614 25 30.0 to 30.095 sec 164.688 26 30.095 to 32.095 sec 218.228 27 32.095 to 105 sec 163.928 28 105 sec to 10 min 166.532 29 10 to 30 min 166.931-30 30 to 60 min 166'.988 31 60 to 239 min 167.045 32 239 to 240 min 167.121 l

CG UFSAR 4

TABLE B.3-7 125 V DC BATTERY B (DIV 2)

Amperege Requirements and Minimum Battery Terminal Voltages Per Time Interval After AC Power Loss 0 to 30 sec 30 see to 1 min 1 to 240 min 325 A 219 A 168 A 115.4 volts 116.4 volts 115.8 volts DESCRIFTION.OF LOADS D

The asperage requirements for each time interval bounds the amperage required by the emergency i

loads that are required to operate during the given interval following the loss of AC power and the 3

failure of both associated tsttery chargers.

The minimum battery terminal voltages are based on o

battery response derived from discharge characteristics and the values bound the DC system y

component requirenents.

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The major loads on the battery are the following:

Standby core cooling equipment 4

o.

Primary Relief Valves 0

b.

RHR Control c.

RCIC Control d

- Diesel Generator Field Flashing 20 Emergency Lightning O

Indicator Lamps & Annunciators

• O ESF Support System control D

Resctor Protection System Load Sequencing Control Saitchgear Uninterruptable. Power Supplies r

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i Waft-i The voltage at the safety-related de battery terminals in i

designed to be maintained within the limit of 105 V de to i

140 V de during all modos of plant operation, including the I

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'-Ut*SAR-peyl(ocfM All direct current equ0pment for Grand Gulf has been specified for operation over the range of 105 V de to 140 V dc.

Components whose qualifications can not meet this specified range are evaluated on a casa by case basis.

These values correspond respectively to the minimum design diacharge voltage and the normal float voltage (plua margin) for the batteries.

Due to voltage drop between the battery terminal and the individual components, actual. ve'tages at the individual components will be below the sattery terminal voltage.

Unless qualified by field testing, a111 components l will be qualified by the manufacturer for the calculated limiting voltage supplied to the equipment.

It should be noted that the lead enicium type of batteries utilized on Grand Gulf are designed to be operated at a nominal float gy3gn4( )

voltage of between 132 and 135 V de without requiring a periodic equalizing charge.

Equalizing charges are performed if an inspection or test finds the battery cell voltage or specific gravity readings are below that as indicated in the Technical Specifications an a minimum.

Equalizing charges ara performed after battery service discharge test and battery performance discharge test.

8.3.2.1.6.3 Ventilation Battery rooms are ventilated to remove the gases produced due to the charging of batteries.

The ventilation system for the Class IE batteries 1,s class IE and redundant.

8.3.2.1.6.4 Maintenance and Testing All components of the 125 volt de systems undergo periodic maintenance tests to det9rmine the condition of each individual subayatom.

Batteries are checked for' electrolyte level, specific gravity and cell float voltage, and visually inspected following manufacturer's recommended procedures.

The service test minimum load profilen+for the A and 8 de system batteries are contained in Tables 8.3-6 and8.3-7.

A

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performance discharge test will be given requiarly to demonstrate the Class IE batteries have sufficient stored energy to supply the load demand discussed in section 8.3.2.1.6.2.

Battery chargers are periodically checked by f

visual inspection and performance tests.

Testing is performed in accordance with the Technical Specifi-cations, and will include requirements for measurement of cell-to-cell as wel? as terminal connection resistance.

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pey 1 7 eR n by the HPCS diesel generator if offsite power is unavailable.

As shown on Figure 8.3-13, a spare charger is provided for maintenance purposes only.

This charger (1C5) is fed from non-Class IE MCC 13B11 (Figure 8.3-10).

8.3.2.1.7.5 Battery Capacity The ampere-hour capacity and short-time rating of the battery are in accordance with criteria given in IEEE Std. 308.

This battery has sufficient stored energy to operate required connected essential loodn for a minimum period of two hours following a loss of ac power to the battery charger.

Capacity is large enough to cope with LOCA conditions or any other emergency shutdown.

Each distribution circuit is capable of transmitting sufficient energy to start and operate all required loads in that circuit.

The 125 volt battery is sized in accordance with the principleo set out in IEEE Std. 300.

8.3.2.1.7.6 Charging The charger for the HPCS 125 volt de syntoms is connected to a Class IE 480 volt motor control center and is capable of carrying the normal direct current system load and, at the same time, keeping the battery in a fully charged condition.

The sizing of the battery charger meets IEEE Std. 308.

A spare battery charger, connected to a non-Class IE motor control center, is provided to allow maintenance to be per-formed on the normal supply charger.

This spare battery charger is for maintenance only and is not sized in accordance with the requirements of subsection 8.3.2.2.1.

8.3.2.1.7.7 Ventilation Dattery rooms are independently ventilated to keep the gases produced due to the charging of batteries below an explosivo concentration.

0.3.2.1.7.8 Maintenance and Testing The design of the installation facilitates the-performance of maintenance and testing of all components of the 125 volt de systems and each individual subsystem.

Batteries are to be checke6 for electrolyte level, specific gravity, and cell float voltage.

The service test minimum load profilegfor the battery is contained in Table 8.3-8, Performance discnarge teste are to be conducted as required to demonstrate the Clas IE batteries have sufficient stored energy to supply the load demand discussed in section-8.3.2.1.7.2.

Battery chargers will also be periodically checked ' bv VLp3Liinapact4cn_ and perforraance tests.

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- -- - e Testing'in to be per 0Fm'e b uri accordance with the Technical Specifications.

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