ML19347C707

Forwards Addl Info in Response to NRC 800818 Questions Re Adequacy of Station Electric Distribution Sys Voltages. Includes Analysis for Unit Auxiliary Transformer Source & Analysis W/Only One Startup Transformer Available

ML19347C707
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	12/29/1980
From:	Rich Smith VERMONT YANKEE NUCLEAR POWER CORP.
To:	Ippolito T Office of Nuclear Reactor Regulation
References
WVY-80-174, NUDOCS 8101050169
Download: ML19347C707 (22)

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V ERMOST Y A N K EM N UCLEAR POWER col &OR ATION ss, SEVENTY SEVEN GROVE STREET B.3.2.1 RUTI. AND. VI;M. tONT 05701 p

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EE December 29, 1980 E2 United States Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Thomas A. Ippolito, Chief Operating Reactors Branch #2 Division of Licensing

References:

(1) License No. DPR-28 (Docket No. 50-271)

(2) USNRC Letter to YAEC, dated August 18, 1980 (3) VYNPC Letter No. WVY 80-44, dated March 17, 1980 (4) YAEC Report #1205, " Auxiliary Power System Voltage Study for Vermont Yankee Nuclear Power Station", dated March 17, 1980 (5) USNRC Letter to All Power Reactors, dated August 8,1979

Subject:

Request for Additional Information on Adequacy of Station Electric Distribution System Voltages

Dear Sir:

As required in Reference (2), we are providing additional info rma tion regarding the adequacy of the station electrical distribution system voltages a t Vermont Yankee. The three items below correspond to the questions of Reference (2).

1.

Question Per Guidelines 3 and 9 confirm that the second-level of undervoltage protection relay will not drop out when the largest Non-Class 1E load starts while the Class 1E buses are fully loaded. Also, verify per NRC Cuidelines 10 and 12 that the second-level (degraded voltage) undervoltage protection setpoints.(voltage and time-delay) will not spuriously separate the Class 1E bus from of fsite sources when the auxiliary loads normally supplied from the unit auxiliary transformer are transferred to the startup transformer for each case analyzed.

Re s po nse Section 2.2.3 of Reference 4 describes the second level of undervoltage 2

protection installed at Vermont Yankee.

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O U.S. Nuclear Regulatory Commission December 29, 1980 Attn:

T. A. Ippolito Page 2 Additional analysis to confirm that the second-level undervoltage protection will not actuate when the largest non-safety class electrical motor starts while the safety class electrical buses are fully loaded is provided as Item 3 in Attachment 1.

Additional analysis to confirm that the second-level undervoltage alarm will not actuate when t19 loads supplied from the unit auxiliary 4

transformer are transferred to one startup transformer, is supplied in item 2 of Attachment 1.

i 1

Examination of Table 4.5 of Reference (4) reveals that when the a

auxiliary loads normally supplied from the unit auxiliary transformer i

are transferred to the two startup transformers, the maximum voltage dip is a value above the undervoltage setpoint of the second-level j

(degraded voltage) undervoltage protection.

2.

Question Do you have a delayed source of power to the Class IE buses through the unit auxiliary transformer (T-2)? Also, is there a design feature that either T-3A or T-3B could supply both redundant load groups?

If so, provide the required analysis.

Res ponse i

j A delayed access source of power to the safety class electrical buses 1

does exist through the unit auxiliary transformer. An analysis for j

this source is provided in Item 1 of Attachment 1.

Vermont Yankee Technical Specification 3.10 states that either T-3A or T-3B could supply the total station load, less the cooling tower load. The required analysis is also provided in Item 2 of Attachment 1.

l 3.

Question Submit the calculated voltages for all low-voltage ac (less than 480 I

volts) Class 1E buses (including all alternate source connections) l or documentation which demonstrates that all low-voltage ac Class 1E l

equipment will be operating within its required voltage ratings for each case analyzed. Do these buses supply instrumentation or control circuits required by GDC 137 If so, is all equipment capable of sustaining the. analyzed voltages without blowing fuses, overheating, I

and without af fecting the equipment's ability to perform the required function.

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6 U.S. Nuclear Regulatory Commission December 29, 1980 Attn:

T. A. Ippolito Page 3 i

Re s ponse Safety class electrical low voltage ac buses at Vermont Yankee consist of the 120/240 Volt Uninterruptible (Vital) AC Distribution Panel, VAC-A Subpanel A, and the 120/240 Volt AC Instrumentation Distribution Panel. These buses supply instrumentation and control circuits required by GDC 13.

We have calculated the worst case voltage on each of the above buses by performing a voltage drop study using as the source voltage the lowest possible source voltage from previous cases in the Vermont Yankee Analysis.

For the 120/240 Volt Uninterruptible (Vital)

AC Distribution Panel and VAC-A Subpr.nel A, the worst case voltage exists when the buses are supplied from their maintenance tie (DT-1 supplied from MCC 9A).

The loading for each bus was obtained from actual load readings at the plant. The bus load can be assumed to be constant in any mode of plant operation.

Voltage was calculated for a steady-state condition when the safety class electrical buses are carrying maximum accident load, and during a transient caused by the start of accident loads. The calculated minimum steady-state and transient voltages for each bus are 104 volts and 100 volts respectively. The transient voltage dip lasts only one to two seconds.

Our investigation for the adequacy of low voltage buses is not complete at this time.

To date, we have compared the calculated voltages with the requirements for operation of the majority of equipment connected to the instrument buses and have not found any problems. Our investigation for the few remaining instruments is not complete because of lack of information from the manufacturer. This investigation is continuing and if we determine any problem exists, we will inform you accordingly.

Yours. truly, VERMONT YANKEE NUCLEAR POWER STATION

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C/et L. Smith Licensing Engineer PJ/pf Attachment

ATTACHMENT 1 ADDITIONAL ANALYSIS FOR VERMONT YANKEE NUCLEAR POWER STATION 1.

Analysis For Unit Auxiliary. Transformer Source A delayed access source is made available through the unit auxiliary transformer by removal of the generator links. - Because this source is a delayed access source, it is available only when the generator is off-line; we assume the following loads are shed prior to connection:

a) condensate pumps b) circulating water pumps c) recirculating M-G sets d) reactor feedwater pumps The analysis is based on the 345 kV system maximum and minimum voltage

-limits of 362 kV and 340 kV, respectively.

Three studies were performed for the analysis through the unit auxiliary trans fo rme r. The first two studies present the voltages for the maximum and minimum load studies. The third study-determines voltages at the buses when the largest non-safety class electrical load starts.

The loading and voltages for the maximum load study are shown in Table 1-A.

The maximum load study demonstrates the capability to operate all safeguards loads through the unit auxiliary transformer without exceeding the minimum allowable voltage.

The loading and voltages for the minimum load study are shown in Table 1-B.

The minimum load study demonstrates that with light load, the maximum ellowable voltage is not exceeded at any bus.

An additional analysis is provided as part of item 3 to confirm that the second-level undervoltage protection will not actuate when the reactor feed pump -starts through the unit auxiliary transformer.

2.

Analysis With Only One Startup Transformer Available Technical Specification 3.10 states that either T-3A or T-3B could supply.the total station load, less the cooling tower load, when one startup transformer is not available. Cases lA, 2A, 3A and34.A of YAEC Report #1205 have been repeated with only one startup transformer available. The loading for each new study is exactly the same as the loading assumptions provided in Tables 3.1 through 3.4 of YAEC Report

1. 1205, except the load for 4.16 kV Bus 5B is zero because the cooling tower load is not considered.

When only one startup transformer is to be utilized, a transformer tap change will be necessary. For this analysis, the startup transformer is placed on the 112 kV tap end the 4160/480 volt unit substation transformers are placed on the 4060 volt tap.

The voltages for studies of start of safeguards motors are -provided in Tables 2-A and 2-B.

These tables correspond to Cases 1-A and 2-A of YAEC Repor: #1205 and demonstrate capability to start safeguards loads either upon transfer from the unit auxiliary transformer or from the startup transformer with no transfer.

Table 2-C corresponds to Case 3-A of YAEC Report #1205 and provides the voltages when one startup transformer carries maximum load. Table 2-D orresponds to Case 4-2 of YAEC Report #1205 and provides the voltages at light lo ad.

Tables 2-A, 2-B and 2-C demonstrate that under worst case loading, the voltage is sufficient to start and operate all safcty loads. Tables 2-A and 2-B show that voltages in the 480 volt system and voltages for some operating 4160 volt system motors drop momentarily (typically for one to two seconds) to values slightly lower than acceptable values when large safeguard motors start. This is of no concern because sufficient voltage exists for acceleration of 4000 volt safeguards motors.

Subsequent to the acceleration of the large safeguards motors, the 4160 volt and 480 volt system will have acceptable voltage.

Although voltages in Table 2A are momentarily below the second-level undervoltage setpoint, sufficient time delay is provided in the second-level undervoltage protection system to prevent actuation when the auxiliary loads are transferred to one startup transformer.

Table 2-D provides the voltages under extreme light load conditions.

This table shows that the 4000 volt motor high voltage limit of 4400 volts and the 460 volt motor high voltage limit of 506 volts may be exceeded by 1 to 2%.

Because of the low magnitude of the above overvoltages, the ef fect on the motors will be inconsequential.and l

can therefore be ignored. Furthermore, the occurrence of the overvoltage requires the coincidence of loss of one startup transformer,.

a minimum load condition and transmission system voltage _ at its maximum value, we believe that the-probability of this overvoltage occurring is slight.

3.

Analysis for Start of Largest Non-Safety Class Electrical Load An additional analysis has been performed to confirm that the second-level undervoltage alarm vill not actuate when the largest non-safety class electrical load, the reactor feed pump, starts while the safety class electrical buses are fully loaded.

I i

The additional analysis is provided for cases in which the unit auxiliary transformer, both startup transformers, and one startup transformer feed the station load. The analysis assumes that the following loads have been shed prior to the start of the reactor feed pump:

a) two condensate pumps b) circulating water pumps 4

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c) circulating water booster pumps d) recirculating M-G set l

The loading assumptions are provided in Table 3-A.

The results for the three cases are provided in Table 3-B.

The results in Table 3-B demonstrate that sufficient voltage exists to accelerate the reactor feed puinp motors within the time delay incorporated in the second level undervoltage protection system. The teactor feed pump motor will accelerate the pump in six seconds with the motor terminal voltage at 3200 volts, 80% of rated voltage; j

therefore, the second-level undervoltage protection will not actuate.

l Table 3-B also shows that voltage for other loads drop momentarily to lower than acceptable values while the reactor feed pump accelerates.

This is shown to be of no concern. Af ter the reactor feed pump starts, voltage will recover to within acceptable values.

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TABLE 1-A Unit Auxiliary Transformer Source Analysis Maximum Load Study Node Loading Bus Voltage No.

Description Assumptions (Volts) 3 345 kV Switchyard 340,000 4

115 kV Switchyard 110,000 8

4.16 kV Bus 5B 9000 kVA 3,454 11 4.16 kV Bus 1 1100 kVA 4,051 12 4.16 kV Bus 3 4,050 13 4.16 kV Bus 2 1100 kVA 4,051 14 4.16 kV Bus 4 4,050 17 Station Service Water PP P7-1D 250 hp 4,048 18 Core Spray PP P46-1B 700 hp 4,039 19 Residual Heat Removal Pump P10-1D 1000.hp 4,035 20 Residual Heat Removal Pump P10-1B 1000 hp 4,038 21 Station Service Water PP P7-1B 250 hp 4,048 25 Station Service Water PP P7-1A 250 hp 4,048 27 Station Service Water PP P7-1C 250 hp 4,048 28 Core Spray PP P46-1A 700 hp 4,045 29 Residual Heat Removal Pump P10-1A 1000 hp 4,043 30 Residual Heat Removal Pump P10-1C-1000 hp 4,040 31 480 Volt Bus 8 458 32-480 Volt Bus 9 457 33 Control Rod Drive Water PP 250 hp.

442 35 Reactor Building Water PP 125 hp 447 37 MCC 8A 180 kVA 458 38 MCC 8B 67 kVA 455 39 MCC 8C 10 kVA 454 40 MCC 9A 100 kVA 457 41 MCC 9B 150 kVA 455 42 MCC 9C 25 kVA 453' 43 Standby Gas Treat. Exhaust Fan REF-2B l'0 hp 458 44 Battery Charger BC-1-1A

'16 kVA -

455 48 MCC 8E 25 kVA

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s TABLE l-A (Continued)

I 4

Node Loading Bus Voltage i

No.

Description Assumptions' (Volts) 52 Core Spray PP Disch. Valve V14-llB 53 Chiller Compressor SCH. 1 74 kW 448 55 Reactor Recire. Unit RRU-8 5 hp 455 58 Diesel Generator 1B Auxiliaries 20 kVA 453 I

60 DG Room Exhaust Fan TEF-3 20 hp 454 l

61 Stat. and Instr. Air Compressor Cl-1A 75 hp 442 64 Battery Charger BC-1-1B 16'kVA 455 68 Core Spray Pump Disch. Viv. V14-11A 69 Reactor Recirc. Unit RRU-7 5 - hp' 455

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i 70 MCC 9D 5 kVA 455 1

72 Diesel Generator lA Auxiliaries' 20 kVA 453 74 Stat. and Instr. Air Compressor Cl-1B 75 hp 442 76 DG Room Exhaust Fan TEF-2 20 hp 453 t

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TABLE 1-B Unit Auxiliary Transformer Source Analysis Minimum Load Study Node-Loading Bus Voltage No.

Description Assumptions (Volts) 3 345 kV Switchyard 362,000 4

115 kV Switchyard 121,000 8

4.16 kV Bus 5B 11 4.16 kV Bus 1 1333 kVA 4,343 12 4.16 kV Bus 3 4,343 13 4.16 kV Bus 2 1333 kVA 4,348 14 4.16 kV Bus 4 350 hp 4,348 17 Station Service Water PP P7-1D 250 hp 4,341' 18 Core Spray PP P46-1B 19 Residual Heat' Removal Pump P10-1D 20 Residual Heat Removal' Pump P10-18.

1000 hp' 4,333 21 Station Service Water PP P7-1B -

25 Station Service Water PP P7-1A 250 hp 4,345' 27 Station Service Water PP P7-1C.

250 hp 4,345 28 Core Spray PP P46-1 A -

29 Residual Heat Removal Pump P10-1A 30 Residual Heat Removal Pump P10-1C '

31 480 Volt Bus 8

.540 kVA 491 32 480 Volt Bus 9 540 kVAL 492 33 Control Rod Drive Water PP 35 Reactor Building Water PP 37 MCC 8A 491-38 -

MCC 8B 491-39-MCC 8C 491 40 MCC 9A

.492 41-MCC 9B 492 42 MCC 9C 492 43 Standby Gas' Treat. Exhaust Fan REF-2B 44 Battery Charger BC-1-1A 48 MCC 8E

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E TABLE l-B (Continued)

Node Loading Bus Voltage No.

Description Assumptions (Volts) 4 52 Core Spray PP Disch. Valve V14-11B 1

53 Chiller Compressor SCH. 1 55 Reactor Recirc. Unit RRU-8 58

-Diesel Generator 1B Auxiliaries 60 DG Room Exhaust Fan TEF-3 61 Stat. and Instr. Air Compressor Cl-1A 1

64 Battery Charger BC-1-1B 68 Core Spray Pump Disch. Viv. V14-llA 69 Reactor Recire. Unit RRU-7 70 MCC 9D 492 72 Diesel Generator lA Auxiliaries 74 Stat. and Instr. Air Compressor. Cl-1B j

76 DG Room Exhaust ' Fen TEF.

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TABLE.2-A Analysis For One Startup Transformer Condition: Maximum Load Transfer to Startup Transfo rmer-Start Safeguard Loads Node Bus Voltage No.

Description (Volts) 3 345 kV Switchyard 340,G00' 4

115 kV Switchyard 110,000 8

4.16 kV Bus SB-3,689 11 4.16 kV Bus 1 3,578' 12 4.16 kV Bus 3 3,573 13 4.16 kV Bus 2 3,683 14 4.16 kV Bus 4 3,677 17 Station Service Water PP P7-1D 3,573 18 Core Spray PP Pf.5-1B 3,530 19 Residual Heat Removal Pump P10-1D 3,522 20 Residual Heat Removal Pump P10-1B 3,533 21 Station Service Water PP P7-1B 3,573 25 Station Service Water PP P7-1 A 3,677

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27 Station Service Water PP P7-1C

'3,677 28 Core Spray PP P46-1A 3,663 29 Residual Heat Removal Pump P10-1A 3,653 30 Residual Heat Removal Pump P10-1C 3,650 31 480 Volt Bus 8 419 32 480 Volt Bus 9 431 33 Control Rod Drive Water PP' 4171 35 Reactor Building Water PP

.431 37 MCC 8A 417 4

38 MCC 8B 416 i_

39 MCC 8C 417 40 MCC 9A

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42 MCC 9C 428 t

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TABLE 2-A (Continued)

Node Bus Voltage

- No.

Description

'(Volts) 43 Standby Cas Treat. Exhaust Fan REF-2B 414 44 Battery Charger BC-1-1A-417 48 MCC 8E 416 52 Core Spray PP Disch. Valve V14-llB-416 53 Chiller Compressor SCH. 1 416 55 Reactor Recire. Unit RRU-8 416 58 Diese Generator 1B Auxiliaries 417 60.

DG Roum Exhaust Fan TEF-3 416 61 Stat. and Instr. Air Compressor Cl-1A 413 64

. Battery Charger BC-1-1B 431 68 Core Spray Pump Disch. Valve V14-llA 430 69 Reactor Recire. Unit RRU-7 430 i

i 70 MCC 9D 430 72

' Diesel Generator lA Auxiliaries 429 74 Stat. and Instr. Air Compressor Cl-1B

~427 76 DG Room Exhaust Fan TEF-2 427-i i

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I IABLE 2-B Analysis For One Startup Transfo rmer Condition: Maximum Load Startup Transformers Carrying Auxiliary Load Start Safeguard Loads Node Bus Voltage No.

Description (Volts) 3 345 kV Switchyard 340,000 4

115 kV Switchyard 110,000 I

8 4.16 kV Bus SB 3,515 11 4.16 kV Bus 1 3,465 12 4.16 kV Bus 3 3,462 l

13 4.16 kV Bus 2 3,507 14 4.16 kV Bus 4 3,501 17 Station Service Water PP P7-1D 3,462 18 Core Spray PP P46-1B 3,420 19 Residual Heat Removal Pump P10-1D 3,413 20 Residual Heat Removal Pump P10-1B 3,423 21 Station Service Water PP P7-1B 3,460 25 Station Service Water PP P7-1A 3,499 27 Station Service Water PP P7-1C 3,501 28 Core Spray PP P46-1A 3,488 29 Residual Heat Removal Pump P10-1A 3,483 30 Residual Heat Removal Pump P10-1C 3,475 31 480 Volt Bus 8 399 32 480 Volt Bus 9 396 33 Control Rod Drive Water PP 397 35 Reactor Building Water PP

~394 37 MCC 8A 399 36 MCC 8B 397 39 MCC 8C 390 40 MCC 9A 396 41 MCC 9B 392 42 MCC 9C 392 4

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Node Bus Voltage No.

Description (Volts)-

43 Standby Gas Treat. Exhaust Fan REF-2B 396 44 Battery Charger BC-1-1A 399 48 MCC 8E 397 52 Core Spray PP Disch. Valve V14-llB 396 53 Chiller Compressor SCH. 1 395 55 Reactor Recire. Unit RRU-8 396 i

58 Diesel Generator 1B Auxiliaries 388 60 DG Room Exhaust Fan TEF-3 387 61 Stat. and Instr. Air Compressor Cl-1A 386 64 Battery Charger BC-1-1B 395 68 Core Spray Pump Disch. Vlv. V14-11A 386 i

69 Reactor Recire. Unit RRU-7

'391-70 MCC 9D 392' 72 Diesel Generator lA Auxiliaries 392 2

74 Stat. and Instr. Air Compressor Cl-1B 390 76 DG Room Exhaust Fan TEF-2 391 l

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TABLE 2-C Analysis For One Startup Transformer Condition: Maximum Load Startup Transformer Carrying Auxillcry Load Node

_ Bus Voltage No.

Description (Volts) 3 345 kV Switchyard 340,000 4

115 kV Switchyard 110,000 8

4.16 kV Bus SB 3,748 11 4.16 kV Bus 1 3,629 12 4.16 kV Bus 3 3,728 13 4.16 kV Bus 2 3,642 14 4.16 kV Bus 4 3,641

'7 Station Service Water PP P7-1D 3,726 18 Core Spray PP P46-1B 3,717 19 Residual Heat Removal Pump P10-1D 3,712 20 Residual Heat. Removal Pump P10-1B

.3,715 21 Station Service Water PP P7-1B 3,726 25 Station Service Water PP P7-1A 3,639 27 Station Service Water PP P7-1C 3,639 28 Core Spray PP P46-1A 3,635 I

29 Residual Heat Removal Pump P10-1A 3,633 I

30 Residual Heat Removal Pump P10-1C 3,629 1

31 480 Volt Bus 8 426 1

32 480 Volt Bus 9 420 33 Control Rod Drive Water PP 421 35 Reactor Building Water PP 417 37 MCC 8A 425 38 MCC 8B 423-39 MCC 8C 423 i

40 MCC 9A 426 41-MCC.9B-418 42 MCC 9C 415

4 4

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TABLE 2-C (Continued)

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Node Bus Voltage l

No.

Description (Volts) 43 Standby Cas Treat. Exhaust Fan REF-2B 421 44 Battery Charger BC-1-1A 424 I

48-MCC 8E 422 52 Core Spray PP Disch. Valve V14-11B 423 53 Chiller Compressor SCH. 1 420 55

- Reactor Recire. Unit RRU-8 420 50 Diesel Generator 1B Auxiliaries 422 60 DG Room Exhaust Fan TEF-3 421 61 Stat. and Instr. Air Compressor Cl-1A 419 l

64 Battery Charger BC-1-1B 419 l

68 Core Spray Pump Disch. Vlv. V14-11A

. 418' 69 Reactor Recirc. Unit RRU-7 414 70 MCC 9D 418 72 Diesel Generator lA Auxiliaries 414 74-Stat. and Instr. Air Compressor Cl-1B 412 76 DG Room Exhaust Fan TEF-2 414.

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1 TABLE 2-D Analysis For One Startup Transformer Condition: Maaimum Load Startup Transformer Carrying Auxiliary Load 4

Node Bus Voltage No.

Description (Volts) 3 345 kV Switchyard 365,000 4

115 kV Switchyard 121,000 I

8 4.16 kV Bus SB 4,425 11 4.16 kV Bus 1 4,435 12 4.16 kV Bus 3 4,435 13 4.16 kV Bus 2 4,423 14 4.16 kV Bus 4 4,423 17 Station Service Water PP P7-1D 4,433 18 Core Spray PP P46-1B 19 Residual Heat Removal Pump P10-1D 20 Residual Heat Removal Pump P10-1B 4,424 21 Station Service Water PP P7-1B 25 Station Service Water PP P7-1A 4,421 27 Station Service Water PP P7-1C 4,421 28 Core Spray PP P46-1A 29 Residual Heat Removal Pump P10-1A 30 Residual Heat Removal Pump P10-1C 31 480 Volt Bus 8 516 32 480 Volt Bus 9 515 33 Control Rod Drive Water PP 35 Reactor Building Water PP 37 MCC 8A 516 38 MCC 8B 516 39 MCC 8C 516 40 MCC 9A 515 41 MCC 9B' 515 42 MCC 9C 515 f

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I Node Bus Voltage No.

Description (Volts) 43 Standby Gas Treat. Exhaust Fan REF-2B j

44 Battery Charger BC-1-1A l

48 MCC 8E

516 i

52 Core Spray PP Disch. Valve V14-11B 53 Chiller Compressor SCH. 1 55 Reactor Recire. Unit RRU-8 58 Diesel Generator IB Auxiliaries 60 DG Room Exhaust Fan TEF-3 l

61 Stat. and Instr. Air Compressor Cl-1A 64 Battery Charger BC-1-1B 68 Core Spray-Pump Disch. Vlv. V14-llA 69 Reactor Recire. Unit RRU-7 70 MCC 9D

.515.

72 Diesel Generator lA Auxilf aries 74 Stat. and Instr. Air Compressor Cl-1B 76 DG Room Exhaust Fan TEF-2 i

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TABLE 3-A Start of Largest Non-Safety Class Electrical Load Loading Assumptions Node Steady State Starting No.

Description Loading Load 3

345 kV Switchyard 4

115 kV Switchyard 8

4.16 kV Bus SB 11 4.16 kV Bus 1 1333 kVA 12 4.16 kV Bus 3 650 kVA*

13 4.16 kV Bus 2 2600 kVA 5500 hp 14 4.16 kV Bus 4 17 Station Service Water PP P7-ID 650 kVA*

250 hp 18 Core Spray PP P46-1B 700 hp 19 Residual Heat Removal Pump P10-1D 1000 hp 20 Kesidual Heat Removal Pump P10-1B.

1000 hp 21 Station Service Water PP P7-1B 250 hp 25 Station Service Water. PP P7-1 A 250 hp 27 Station Service Water PP P7-1C 250 hp 28 Core Spray PP P46-1A 700 hp 29 Residual Heat Ramoval Pump P10-1A 1000 hp 30 Residual Heat Removal Pump P10-1C 1000 hp 31 480 Volt Bus 8 32 480 Volt Bus 9 33 Control Rod Drive Water PP 250 hp 35 Reactor Building Water PP 125 hp 37 MCC 8A 180 kVA 38 MCC 8B 67 kVA 39 MCC 8C 10 kVA 40 MCC 9A 100 kVA' 41 MCC 9B 150 kVA 42 MCC 9C 25 kVA-

2 TABLE 3-A (Continued)

Loading Assumptions Node Steady State Starting No.

Description Loading Load 43 Standby Gas Treat. Exhaust Fan REF-2B 10 hp 44 Battery Charger BC-1-1A 16 kVA 48 MCC 8E 25 kVA 52 Core Spray PP Disch. Valve V14-llB 53 Chiller Compressor SCH. 1 74 kW 55 Reactor Recire. Unit RRU-8 5 hp 58 Diesel Generator 1B Auxiliaries 20 kVA 60 DG Room Exhaust Fan TEF-3 20 hp 61 Stat. and Instr. Air Compressor Cl-1A 75 hp 64 Battery Charger BC-1-1B 16 kVA 68 Core Spray Pump Disch. Vlv. V14-llA 69 Reactor Recire. Unit RRU-7 5 hp 70 MCC 9D 5 kVA 72 Diesel Generator lA Auxiliaries 20 kVA 74 Stat. and Instr. Air Compressor Cl-1B 75 hp 76 DG Room Exhaust Fan TEF-2 20.hp

• Represents RHR Service Water Pump Load I

1

I TABLE 3-B Start of Largest Non-Safety Class Electrical Load Case 1:

Load Fed by Two Startup Transformers Case 2:

Load Fed by Unit Auxiliary Transformer Case 3:

Load Fed by One Startup Transformer Bus Voltage (Volts)

During Start of Largest Non-Safety Class Electrical Loads Node No.

Description Case 1 Case 2 Case 3 3

345 kV Switchyard 340,000 340,000 340,000 4

115 kV Switchyard 110,000 110,000 110,000 8

4.16 kV Bus SB 3,359 4,037 3,477 11 4.16 kV Bus 1 3,922 4,010 3,463 12 4.16 kV Bus 3 3,920 4,009 3,4621 13 4.16 kV Bus 2 3,350 3,636 3,468 14 4.16 kV Bus 4 3,348 3,638 3,467 17 Station Service Water PP P7-lD 3,919' 4,007 3,460 18 Core Spray PP P46-1B 3,910 3,999 3,452 19 Residual Heat Removal Pump P10-1D 3,905 3,994 3,447 20 Residual Heat Removal Pump P10-1B 3,909, 3,998 3,451 21 Station Service Water PP P7-1B 3,919 4,007 3,460 25 Station Service Water PP P7-1A 3,347.

3,636 3,465 27 Station Service Water PP P7-1C 3,347 3,636 3,465-28 Core Spray PP P46-1 A 3,343 3,633 3,461 29 Residual Heat Removal Pump P10-1A.

3,341 1,631 3,459 30 Residual Heat Removal Pump P10-1C 3,338:

3,628 3,454 31 480 Volt Bus 8 450 454 398 32 480 Volt Bus 9 387 419-402 33 Control Rod Drive Water PP 445 439 393 35 Reactor Building Water PP 384 412 399 37 MCC 8A 449 454 397 38 MCC 8B 447 451

395 39 MCC 8C 447 450 395

,,m, m.

m.

y

2 s

IABLE 3-B (Continued)

Bus Voltage (Volts)

During Start of Largest Non-Safety Class Electrical Loads Node No.

Description Case 1 Case 2

' Case 3 40 MCC 9A 387 418 401 41 MCC 9B 386 418 401 42 MCC 9C 383 417 398 43 Standby Gas Treat. Exhaust Fan REF-2B 445 454 392 44 Battery Charger BC-1-1A 448 451 396 48 MCC 8E 446 450 394 52 Core Spray PP Disch. Valve V14-11B 447 451 395 1

53 Chiller Compressor SCH.1 444 444 392 j

55 Reactor Recire. Unit RRU-8 444 451 392 58 Diesel Generator IB Auxiliaries 446 449 393 60 DG Room Exhaust Fan TEF-3 445 450 393 61 Stat. and Instr. Air Compressor Cl-1A -

'443 438 391 64 Battery Charger EC-1-1B 386 417 401 68 Core Spray Pump Disch. V1v. V14-11A 386 418

'401 69 Reactor Recire. Unit RRU-7 382 418 397 70 MCC 9D 386 418 400' 72 Diesel Generator 1A Auxiliaries 382 417 397 1

74 Stat. and Instr. Air Compressor Cl-1B 380 408 395 76 DG Room Exhaust Fan TEF-2 382 417 396 i

r

)

4

- -,.,