ML19323D026

Adequacy of Station Electrical Distribution Sys Voltages

ML19323D026
Person / Time
Site:	La Crosse File:Dairyland Power Cooperative icon.png
Issue date:	04/01/1980
From:	SARGENT & LUNDY, INC.
To:
Shared Package
ML19323D021	List: ML19323D020 ML19323D026
References
NUDOCS 8005190548
Download: ML19323D026 (19)

Text

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SARGENTQ LUNDY ENO NEEns 8006190548 c

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1 I

LACBPR GENERATING UNIT ADEQUACY OF STATION ELECTRICAL DISTRIBUTION SYSTEMS VOLTAGES I

Project No. 6101-33 April 1, 1980 O

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SARGENT Q LUNDY ENGINEEDO CHIC A T,0 TABLE OF CONTENTS c

Page I.

, INTRODUCTION

'l II.

STATION ELECTRICAL DISTRIBUTION SYSTEM 1

III.

LOAD ANALYSIS 2

1 IV.

OFFSITE POWER SUPPLY 2

V.

CRITERIA OF ACCEPTABLE VOLTAGE 3

VI.

PERFORMANCE OF STATION ELECTRICAL DISTRIBUTION SYSTEM 3

1.

Existing RAT Tap Settings 3

2.

Proposed RAT Tap Settings 4

3.

Recommendation 5-VII.

UNDERVOLTAGE RELAYS 5

VIII. VERIFICATION OF ANALYSIS BY " TEST" 6

IX.

CONCLUSION 6

O 6

SARGENT O LUNDY E N GIN E E RS CHICAGO Project No. 6101-33 April 1, 1980 ADEQUACY OF STATION

.c ELECTRICAL DISTRIBUTION SYSTEMS VOLTAGES LACBWR GENERATING UNIT I.

INTRODUCTION The Nuclear Regulatory Commission (NRC) has required the licensees of all power reactors, in a letter dated August 8, 1979, to show that each plant's station electrical distribution system will provide an adequate supply of power to essential loads during the contingency which presents the largest load demand on the auxiliary system.

This request was a result of the incident at Arkansas Nuclear One Station described in detail in the NRC's IE Information Notico 79-04.

This report documents the results of the study conducted to determine the adequacy of the electrical distribution system at the LACBWR Generating Unit to provide a power source of sufficient capacity and capability to supply the engineered safety feature loads in the event of a contingency presenting the maximum load demand on the system.

The study has been made according to the guidelines outlined in Enclosure 2 of the NRC letter dated August 8, 1979.

II.

STATION ELECTRICAL DISTRIBUTION SYSTEM 1

The station electrical distribution system for LACBWR Generating Unit is shown on Attachment 1.

The auxiliaries for the unit are supplied from two, 2400V and four, 480V switchgear buses.

Of these six buses, two, 480V buses are designated as essential buses, namely, 480V ESS bus lA and 480V ESS bus 1B.

During normal operation the auxiliaries are supplied from unit auxiliary transformer #1 (UAT).

When the unit is not in operation as during start-up, shutdown, unit trip, or a loss of coolant accident (LOCA), the auxiliaries are trans-

)

ferred to reserve auxiliary transformer #1 (RAT). 'The transfer of load from UAT to RAT is automatic provided.

the main feed breaker from UAT at 2400V bus is tripped and its overcurrent relays have not operated.

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GARGENT QLUNDY E N GIN E C Rs April 1, 1980 CHICAG*

6101-33 Page 2 c

The offsite power to the safety related buses is available

'via RAT #1.

The LACBWR G'enerating Unit does not have a generator breaker or any other available connection to the of f site network.

Hence, the study has been conducted for RAT operation only.

This is in reference to item #1 or the NRC guidelines.

III.

LOADING ANALYSIS The case chosen for detailed voltage evaluation represents the loading of the auxiliary system which will result in the worst voltages at the auxiliary buses as required by the guideline (item #1).

The LACBWR station is a one unit boiling water reactor.

Hence, the multi-unit analysis required by the guideline (item #2) is not applicable in this case.

The worst loading condition for RAT operation exists when, the unit experiences a loss of coolant accident.

The unit was assumed to be generating rated output at the time of the event.

All loads operating for the unit's 100%

generation were transferred from UAT to the RAT.

In addition, the RAT was assumed to carry the LOCA load.

The largest motor among the auxiliaries has been started to determine the voltage dip during the motor starting condition.

No manual load shedding has been assumed in the analysis.

The above approach satisfies items 3, 4, and 5 of the NRC guidelines.

Bus loadings reflecting the above operating condition a.re shown on Attachment 2.

IV.

OFFSITE POWER SUPPLY The of fsite power at LACBWR Generating Unit is supplied from the 69 kV generator plant bus.

This bus can be connected either to the 69 kV main bus or to the 69 kV transfer bus

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CARGENT & LUNDY EN GIN E ERo April 1, 1980 C HIC ALO 6101--33 Page 3 at t e Genoa Substation.

The voltage at the 69 kV generator plant bus varies between 70,8 kV and 73.2 kV.

This voltage rango has been determined on the basis of minimum and maximum steady state voltages experienced at the connection to the offsite circuit of the station electrical distribution system.

The minimum voltage was used as a basis for determining the voltages at equipment terminals.

This complies with item #6 of the NRC guidelines for voltage drop calculation.

A minimum of 718 MVA three phase short circuit level has been determined to be available at the 69 kV generator bus.

V.

CRITERIA FOR ACCEPTABLE VOLTAGE The criteria for the acceptable voltage range at motors, contactors, and control circuits is based on equipment ratings as defined by the National Electric Manufacturers Association.

These standards require that the maximum voltage should be limited to 110% and the minimum voltage be limited to 90% of motor rated voltage.

Alternating current contactors should withstand 110% of the ra~ ed t

voltage continuously and should close successfully at 85% of their rated voltage.

In order to provide adequate torque for motor starting and to prevent contactors from dropping out at 480V motor

)

control centers, the starting voltage should be limited to'an acceptable level.

This level is 80% of motor rated voltage.

I

-VI.

PERFORMANCE OF ELECTRICAL DISTRIBUTION SYSTEM 1.

Existing RAT Tap Settings (72450-2460V)

The results of the study made for RAT #1 operation using the present tap settings of the RAT and the 480V. auxiliary transformers are shown on Attachment 3.

This attachment s

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SARGENT Q LUNDY EN GIN E ERs April 1, 1980 cmcao 6101-33 Page 4

' indicates the voltage at the input and output of each transformer and at each bus between the connection to the of fsite circuit and terminals of the safety related load and, therefore, complies with the requirement of item #7 of the NRC guidelines.

The attachment also shows the maximum postulated loads on the buses and the existing tap settings and the nameplate impedances of the transformers.

The attachment' further shows the cable and bus duct impedances between different buses and between different transformers and switch-gears used in the study.

, tabulates the maximum expected voltage, the minimum operating voltage, and the motor starting voltage at.the terminals of various safety loads for the case analyzed.

This attachment :omplies with the requirement of items #9 and #11 of cne NRC guidelines.

I Attachments 3 and 4 indicate that the maximum expected voltage at any motor terminal is within the criteria of acceptable voltages described in Section V of this report.

However, the running voltage at 480V buses,*

are below 85% of the bus rated voltage and the running voltage at some 440V motor terminals are below the minimum criteria of acceptable voltage.

2 Proposed RAT Tap Settings (70725-2400V)

In order to improve the voltages at the 480V system to an acceptable level, we evaluated the performance of the electrical distribution system by setting the HV

]

tap of the RAT at 70725V.

This was the only change made from the previous case evaluated in Section VI.l.

l l

The results of this change case study are tabulated in Attachments 5 and 6.

These results indicate that the l

maximum expected volte.ge, the minimum running voltage, i

and the motor starting voltage at the terminals of all safety or non-safety related loads are within the acceptable criteria.

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SARGENTOLUNDY E N GIN E rno April 1, 1980 cmcaos 6101-33 Page 5

' ecommendation 3.

R In order to increase the distribution system voltages to acceptable levels during a contingency when the RAT is carrying the normal auxiliary load (corresponding to 100% unit generation) plus the emergency load, we recommend that the high side tap of the RAT be changed from its present setting of 72450V to 70725V (the next 2.5% lower tap).

The taps of 480V auxiliary transformers will remain at their present settings (2520-480V).

VII.

UNDERVOLTAGE RELAYS lists the existing voltage time settings of the undervoltage relays at different auxiliary buses.

Two sets of undervoltage relays at 480V ESS buses lA and 18 are required to transfer the load from the offsite power source to the onsite diesel generator if the offsite source is lost or degraded.

The first set, devices 427 ESA and 427 ESB, will transfer the load in case the offsite sourcq is lost and the new set of the undervoltage rclays (planned by Dairyland Power Cooperative) will cause the transfer when the offsite source voltage is degraded.

We have determined that the bus voltage at 480V ESS bus 1B can go as low as 359V during the starting of the 1500 hp Rx feed water pump at 2400V bus and to 361V during an assumed simultaneous startup of all motors connected to the 480V bus.

The present and planned settings of the first set of under-voltage relays on these buses will, for the voltage dips evaluated, give a time delay in excess of 9 seconds before closing their contacts.

The second set of undervoltage relays has a fixed time delay of 9 seconds.

This delay in the operation of the undervoltage relays is sufficient to prevent relay operation during the transient voltage dips caused by motor starting.

Further, these relays incorporate sufficient time delay (1.8 sec or more) for a zero voltage condition on the bus; hence, the short circuits would be cleared without undervoltage relay operation.

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SARGENTOLUNDY EN GIN E Eno April 1, 1980 cme" 6101-33 Pago 6 e

VIII. VERIFICATION OF ANALYSIS BY " TEST" Meter readings taken on February 2, 1980 at 21 hour2.430556e-4 days <br />0.00583 hours <br />3.472222e-5 weeks <br />7.9905e-6 months <br /> during hot shutdown of LACBUR Generating Unig while the auxiliary buses were fed f rom the RAT, were used to verify the validity of this analysis.

' shows the meter readings of the source voltage, bus voltage, the loads in amperen at the au::lliary buses, and the kilowatts flowing through the RAT.

The attachment also indicates the calculated values of the bus voltage for the loading of the auxiliary system at that time.

A comparison between the meter readings and the calculated values of the bus voltages indicate that the differences are well within the metering accuracy errors.

It is, therefore, concluded that the results of the analysis are valid as demonstrated by the close agreement between the measured and calculated values.

IX.

CONCLUSION The study has demonstrated that,with its high voltage tap setting changed from present value of 72450V to 70725V, the RAT and the onsite distribution system are af sufficient capacity and capability to start as well as operate all i

required safety related loads within their required voltage ratings during a contingency which presents the largest load demand on the auxiliary system.

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Prepared by H. Ashrafi, Electrical Analys t

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/os Approved by S.

Z. Haddad, Head Electrical Analytical Divisicn s

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f, ARGENT Ot. UNDY E N O f N E E R.a

' April 1, 1980 C WC AC

• 6101-33 ATTACliMENT 2 BUS LOADIllGS ASSUMED FOR 4

OFFSITE POUER SUPPLY AtlALfSIS 1

For Reserve Auxiliary Tcansformer #1 Operation Bus Load 2400V Bus lA 700 kVA 480V Bus lA 600 kVA 1

480V ESS Bus lA 40 kVA 480V Turb Bldg MCC 1A 103 kVA 2400V Bus 1B 2100 kVA 1

480V Bus 1B 800 AVA 480V ESS Bus 1B 149 kVA 480V Rx Bldg MCC 1A 80 kVA i

4560 kVA i

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LACSWR cthERATING UNIT RAT CARRYING N0pvL Atl4. LOA 3 (TOR 100s cImraATrON) + f _ME.tGDCY I,OAD frt RAT WITH PRESENT TAP SETTINGS (72450-2400V)

I Volt Volt Volt HP Vole Vott F3t=

rs 69 kV Cenerator Bas 32s Volt kV 73.2 70.8 70.8 3Js Volt. kV 73.2 10.8 70.8 6 of 69 kV 106.1 102.6 102.6 4 of 69 kV 106.1 102.6 102.6 H Peterve Aux.

(JJL AAsTr nsf. 81 fv7"*fvT72450-2400V l

X Z

• 7% d 5 MVA 5 HVA (OA) e-o, N>sn-Seg Bus Duct Isped = 0.000462 y 4. 6 M A

+I 0.004623 g

mas Volt 2425 2232 2162 350 liff.1 ras IIA 2400V Bas 13 Bas Volt 2425 2232 1966 1500 l

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.es t of 2400V 101.0 93.G E1.9 i of 2410V 101.0 93.0 40.1 4 of 2300V 105.4 97.0 14.0 Cable Imped 7

F cable Izred t of 2300V Ic5.4 97.0 65.5

=0.001354

,00 kVA 9 2.1 ftVA 9

=0.001083

+J0.0008593 0.86PP 0.66Pr

+JC.0006873 6

I 499V TRe1A 46CV TRelB g

2520-4 ROV 2520-480V 759/10C0 kVA 750/1000 kVA f

cy

,3s gj-s j rv' *<1 E = 5. 4 4 9 750 kVA ev--es2=5.46 3 750 I

i kVA Pus Volt 462 407 393 60 430V Du s IA (BOV Dun 1B aus Volt 442 40) 350 130 4 of 440V 105.0 92.5 89.5 Cable Imped 9

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.rs t of 4607 96.4 84.0 79.2 4 of 481V 96.2 84.9 81.9 Cable Imped n of 4407 1C 5.0 91.6 86.4

=0.003792 600 kVA BJO klA 9

=0.C01491

+J 0.00 217 70 0 0.89PF 0.9tP?

+J0.00 2 2183 l

Bus volt 462 405 378 122 480V ESS Bus 1A 41CV E 55 Bus la Bus Volt 462 4G1 351 228 4 of 480V 96.2 84.6 78.7 (com-g 1

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k of 480V 96.2 23.7 73.1 (com..

t of 440V 105.0 92.5 85.9 bined v

Cable Imped g of 440V 10 5.C 91.1 79.9 bir.ed '

ESS 40 kVA 9 149 k7A 9

=0.0122 g33

,,0.94PF 0.93PJ

+J0.00370 Motor

4c tor HP)

Cable Imped f

HP

=0.G051

+J0.00110 i

lus Volt 462 404 Tu r5nids Mcc 1A 8x BlJ 7 MCC 1A 3as volt 462 191 4 of 480V 96.2 84.2 6 of 460V 96 J 83.1

% of 440V 105.0 91.8 103 kVA 6 of 440V 105.(

90.7 9 0.9PF 80 kVA G 0.85PF

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ATTACHMENT 3 j

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SARGENTGLUNDY E N GIN E E R g April 1, 1980 c m e^5*

6101-33 ATTACHMENT 4 VOLTAGE AT THE TERMINAL OF SAFETY RELATED LOAD LACBWR GENERATING UNIT WITH EXISTING TAP SETTINGS 1.

Maximum Voltage Expected at the Motor Terminal (Acceptable Voltage is 110% of Motor Rated Voltage)

Maximum Acceptable Motors Connected Voltage @ the To Max. No-Load Voltage

• Motor Terminal 2400V Buses 2425V*

2530V 480V Buses 462V*

484V 2.

Motor Running Voltage for the Case Analyzed (Acceptable Voltage is 90% of Motor Rated Voltage (440V) 1.e.,3957; Voltage @

Worst Drop In Voltage ]

Bus the Bus the Motor Feeder Motor Motor Ten-i 480V ESS 405V SV Emergency 4007 Bus lA Core Cool Pump 1A Turb Eldg 404V 4V Any motor 4007 MCC 1A fed from turb bldg MCC 1A 480V ESS 40lv 6V Emergency 395V Bus 1B Core Cool Pump 1B Rx Bldg 399V SV Any motor 3947 MCC 1A fed from Rx bldg MCC 1A s

• The maximum expected voltage at the motor terminal will be lower th:r.

the maximum no-load voltage due to voltage drop in the transformer and the cable supplying the connected equipment.

1

CARGENT Q LUNDY anciNEEnc

• Pril 1, 1980 cmcuo 6101-33 - Page 2 3.

Motor Starting Voltage for the Case Analyzed JAcceptable Voltage is 80V of Motor Rated Voltage (440V)i.e., 352V)

Starting Voltage @

Bus Motor Started HP the Motor Terminal 480V ESS Simult. start 122 378V Bus lA of ESS motors 480V ESS Simult. start 228 351V Bus 1B of ESS motors 6

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LACBWR GENERATIt'G UNIT RAT CARRYING NOPMAL AUX. LOAD (FOR 1001 GENERAQOy),_t UtIRGEp.t"Y FAAD No ra11 'Mo tor so rull Motor i

toad I,oad Start RAT TAFS AT 70725-2400V I. cad Load Start F

Volt volt Volt HP Volt Volt Volt FP 69 kV Generator Dus aus Volt kV 73.2 70.8 73.8 aus Volt kV 73.2 70.8 70.8

% of 69 kV 106.1 102.6 102.6 4 of 69 kV 106.1 102.6 102.6 el Reserve Aux, h

w Transf. 81 (YY'W 707 25-2400V X

z = 75 e 5 MVA 5 HVA (OA) pp, Non-Seg Bus Duct Imped = 0.000462 7 4.56 MVA

+J 0.004623 8 0.98PF

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Bus volt 2484 2293 2220 350 2400V nus iA 2400v Bus 1B Sus Volt 2484 2293 2018 1300 1

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t of 243GV 103.5 95.6 84.1 4 of 2400V 103.5 95.6 92.5

-a 4 of 2300V 100.0 99.7 96.5 Cable Imped y

v Cable Imped t of 2300v 108.0 99.7 87.8

=0.001354 700 kVA 9 2.1 (UfA e

-0.001083

+J0.0008590 0.86PP 0.86Pr

+J0.0006870 480V TR81A 480V T381D 2520-480V 2520-480V 750/1300 kVA 750/13-JO kVA ww wg m m Z=5.4% @ 750 kVA m

m z=5.46 2 750 kVA

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Bus volt 473 419 405 60 480V Bu 9 1A 4e0V Bus ID aus Volt 473 415 391 100 j

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% of 480V 98.6 87.4 84.4

.m 4 of 480V 98.6 86.6 81.4 1 of 440V 107.5 95.2 92.2 Cable Impeo Cable Imped-

% of 440V 107.5 94.3 89.1

=0.003792 6,

kVA 800 k/A 8

=0.001491

+J0.0021770 9 0.89PF 0.94P?

+J0.0022183

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Bus volt 473 418 389 122 480V ESS Dus 1A 410V E 'S Bus ID aus Volt 473 414 361 228 i

t of 480V 98.6 87.1 81.0 (com-g 1

n of 480V 98.6-66.3 75.2 (com-

.m t of 440V 107.5 95.0 88.5 bined y

Cable Imped i of 440V 107.5 94.1 82.2 b1ned ESS 40 kVA 9 149 k'/A 9

=0.0122 gss Motor 0.94PF 0.93P1

+J0.00370 Motor HP)

[ableImped li?

=0.0051

+J0.00110 Bus Volt 473 416 Tu rh Blas Mf'f' _1 A PJE Bld4 MCC 1A Bus VCIC 47) 411 6 of 480V 98.6 86.7 t

t of 480V 58.6 85.6 4 of 440V 107.5 94.5 103 kVA 4 of 440V 107.5 93.4 0 0.9Pr 80 kVA 8 0.85PF 4

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ATTACHMENT 5 e

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SARGENT O LUNDY ENo Nreng April 1, 1980 c

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6101-33 ATTACHMENT 6 VOLTAGE AT THE TERMINAL OF SAFETY RELATED LOAD LACBWR GENERATING UNIT P

2 % VOLTAGE BUCK THROUGH RAT 1.

Maximum Voltace Expected at the Motor Terminal (Acceptable Voltage is 110% of Motor Rated Voltage)

Maximum Acceptable Motors Connected Voltage @,the To Max. No-Load Voltage

• Motor Terminal 2400V Buses 2484V*

2530V 480V Buses 473V*

484V 2.

Motor Running Voltage for the Case Analyzed (Acceptable Voltage is 90% of Motor Rated Voltage (440V).I.e.,396J, Voltage @

Worst Drop In Voltage 3:

Bus the Bus the Motor Feeder Motor Motor Terr 480V ESS 418V 5V Emergency 413'I Bus lA Core Cool Dump 1A Turb Bldg 416V 4V Any motor 4127 MCC 1A fed from j

turb bldg MCC 1A 480V ESS 414V 6V Dnergency 408V Bus 1B Core Cool Pump 1B Rx Bldg 411V SV Any motor 406V MCC 1 A fed from Rx bldg MCC 1A

• The maximum expected voltage at the motor terminal will be lower than the maximum no-load. voltage due to voltage drop in the trans-former and the cable supplying the connected equipment.

SARGENTO LUNDY E N GIN E E Ro April 1, 1980 cmcaso 6101-33 - Page 2 II MotobStartingVoltagefortheCaseAnalyzed 3.

(Acceptable Voltage is 80V of Motor Rated Voltage (440V)i.e., 352V)

Starting Voltage @

Bus Motor Started HP the Motor Terminal 480V ESS Simult. start 122 389V Bus lA of ESS motors i

480V ESS Simult. start 228 361V Bus 1B of ESS motors

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ATTACl! MENT 7 EXISTING UNDERVOLTAGE RELAY SETTINGS Device Voltage

% Of Time Dial Undervoltage Relay At No.

Setting Bus Voltage Setting Function Trips all Eod scram

.2400V Bus lA 227 1A 1860V 77.5 2 Sec ekt #1, partial scram,-

CWP, Rx FCP, Alarm and~

seal in 2400V Bus 1B 227 1B 1860V 77.5 2 Sec As above 480V Bus lA 427 1A 220V-45.8 1 Sec Trips main breaker at 480V swgr, Alarm and seal in 480V Bus 1B 427 1B 220V 45.8 1 Sec As above

- 480V ESS Bus lA 427 ESA 328/372*

68.3/77.5*

2. 5/2* Sec Starts diesel gen, trips DG test load bkr, trips feed from 480V bus 480V ESS Bus 1B 427 ESB 328/372*

68.3/77.5*

2. 5/2* Sec As above

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e Existing Undervoltage Relay Settings Page 2 Device Voltage

% Of Time Dial Undervoltage Relay At No.

Setting Bus Voltage Setting Function 480V ESS Eus lA Second level

• 400V*

83.3*

9 Sec*

As above of UV pro-tection for safety related loads

- 480V ESS Bus 1B Second level

• 400*

83.3*

9 Seca As above of UV pro-tection for safety related loads 480V Turb. Bldg. MCC 1A 427T 328V 68.3 1.5 Sec Trips all rod scram ekt #1 and ekt #2 Alarm and seal in 480V.Rx Bldg. MCC 1A 427R 220V 45.8 1.5 Sec As above

• indicates planned action by Dairyland Power Cooperativd.

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m 2CD'.ic GL.CM:.. G:.li RAT cnRytNr: HOT St1UTTGIN LCAD Me tsr Calcu<

Meter Celcu-Acad-lated Ans tifi-Pead-lated Ju tty 2.

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ing Value Error catices ang Valt;e Errcr cetAm 69 kV Cererator Dus Sus Voit kV 72 72 Jus Volt kV 72 72 H Peserve Aux.

i ULL w Transf. el W

W 72450-2400v X

g. y g g $ gyA 5*NA (OAl er, Non-Seq Dus Duct 370A,? 1250 kW*

Imped = 0.000462 9

3 gy

+J 0.004622 9 0.94PF

_ Bus Volt

'2310V 2348 1.6%

tterin 240'V Bas 2400V Bus IB Sas Volt

• 2300 2348 26 tuter-5tsuxas-r T

e racy Cable Imped T

y Cable Imped Irwru-

=0.001354 400 kVA 464 kVA

=0.001095 racy

+J0.00085M

+J0.000647::

I 75A* i 480V TpetA 79A* j 460V TRele 2520-480V.

2520-480V t

750/1000 kVA

%,750/1900 kVA wu m

m 2=5.44 4 750 kVA ev-m z=5.4% @ 750 kVA aus Volt

• 440V 440 0%

480V Du s IA 4POV Bar 1B Bas Volt 43d 439 0.2t 300 kVA 316 k7A

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• indicates the meter reading.

4 ATTACHMENT 8 O

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