Text

Auxiliary Power Sys Voltage Study.
	ML19312D230
Person / Time
Site:	Vermont Yankee
Issue date:	03/17/1980
From:	Johnson P, Urbanowski S; YANKEE ATOMIC ELECTRIC CO.
To:	;
Shared Package
ML19312D227	List: ML19312D226; ML19312D230;
References
	YAEC-1205, NUDOCS 8003210576
	Download: ML19312D230 (40)
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Yan<ee Atomic E ectric Company ,

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.E AUXILIARY POWER SYSTE!!

VOLTAGE STUDY FOR VERMONT YANKEE NUCLEAR POWER STATION By P. R. Johnson and S. F. Urbanowski l

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.. '; /g I Prepared By: .h.. !/ E[.:...h.- i

.P. R. Johnson, Electrical. Engineer Date Prepared'By: S//780 S . F, Urbanowski, Senior Engineer Date Reviewed By:N . t ' # 7 !M

.G. Senior Electrical Engineer- 'Dats I S p uderosD

. , I Approv'e'd By:- -

k . . btAi . .T 3l17 6 T/ j F. D..Baxter, Manager Date .!

Electrical Engineering Group-

.l Yankee Atomic Electric' Company l

-Nuclear-Services' Division -l 25 Research Drive

~Westboro,' Massachusetts 01581 ,

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DISCLAltfER'0F. RESPONSIBILITY

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.- This' document'was prepared':by Yankee; Atomic' Electric Company.on c behalf 'of Vermont l- Yankee N telear' Power Corporation.- This document is believed to"be completely. true',~nd accurate : to the best of our knowledge and'information.' ItJ.is. authorized forluse specifically.by Yankee Atomic l Electric Company,; Vermont . Yankee Nuclear Power' Corporation' and/or the appropriate subdivisions within the Nuclear; Regulatory Commission only.

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-With regard to.any unauthorized use whatsoever, Yankee Atomic-

. Electric Company, Vermont Yankee Nuclear- Power Corporation and their officers,idirectors,= agents and employees; assume no liability nor make any

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~ warranty or.' representation with respect to the contents of this document

, .or.to its accuracy or completeness.

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< ' ABSTRACT 4

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report; presents the results.ofsan exhaustive review of the auxiliary power system 'atythe Vermont Yankee Nuclear Power Station. This

review.wasl; initiated by:a direct'ive from the Nuclear Regulatory Commission.-

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$This.reportdemonstratesthattheVermontYankeeNuclearPowerStation

. auxiliary power system is of-sufficient capacity to automatically start

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.and operate' alifsafety I'oa'ds, assuming that all onsite power systems are

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ACKNOWLEDGEMENTS'.

t The' authors' wholeheartedly thank Jim DiLuca (Northeastern University

'Co-opstudent)forhiksignificanteroleinthepreparationof.thisreport.

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l Jim' assisted in ne'arly'every phase of the project. including data preparation,

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~-modeling'and performing th'e variousLload. flow studies on the. interactive computer.

-We also wish to thank'the' staff of the Rh' ode Island, Eastern Massachusetts, and Vermont Energy Control (REMVEC); especially Dave Hayward,

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Paul Earnett, and Russ Burke for their assistance and the use of their facilitiesi.-

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TABLE OF CONTENTS

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. ' DISCLAIMER 0F.R'ESPONSIBILITY.............................. ii

? ABSTRACT......................................'............ iii-ACKN0WLEDGEMENTS.......................................... iv TABLE OF CONTENTS......................................... v-LIST OF FIGURES........................................... vi ,

LIST OF TABLES............................................ vil 1.0 LINTR0 DUCTION..................'............................ I 2.0 -AUXILIARY POWER SYSTEM.................................... 2 2.1-Description........................................... 2 2.2 Power System Voltage Requirements..................... 2 2.2.1 ~ Offsite Power System Operating Voltage Range.................................. 8 Motors and Contactors.......................... 8

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2.2.2 2.2.3 Undervoltage Relay Setpoints................... 9 3.0 .

ANALYSIS.................................................. 11

< .. 3.1 Problem Statement.........'............................ 11 3.2 Method................................................ 12 3.3, Assumptions........................................... 13 3.3.1 Impedance Model................................ 13 l 3.3.2 Maximum Load Mode 1............................. 15 3.3.3 Minimum Load Mode 1............................. 19

4.0 CONCLUSION

S............................................... . 21 S.0 VERIFICATION.............................................. ~32 REFERENCES................................................ 34 O O O

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LIST OF FICURES-O; -Numb 5r . Title. Page

" . 2.1 - Main O'ne Line; Diagram'.

. Vermont--Yankee Nuclear Power. Station................... 3

, 2.'2 . Auxiliary One' Line Diagram -

. Vermont, Yankee i?- 1.ea r Powe r : S ta t ion. . . . . . . . . . . . . . . . . . . 4 2.3 ~ Balance of/ Plant Auxiliary One Line Diagram Vermont Yankee Nuclear Power Station................... 5 Emergency Bus Auxiliary One Line_ Diagram

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' Vermont Yankee Nuclear Power Station................... 6 2.5~ : 480 VL Auxiliary One Line Wiring Diagram

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Vermont Yankee--Nuclear. Power Station................... 7 3.1 Load Flow Model Ve rmont Yankee Nuclea r Powe r S ta t ion. . . . . . . . .'. . . . . . . . . . 14-

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-LIST OF' TABLES i

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"INumbir'- ' : Title- E Page

, J 2.1 -Transmission: System Voltages........................... .8 2.2- : Motor.and Contactor. Voltage Requirements............... 9

' 13.11 - Loading Ass'umptions -' Case-1........................... 16 3.2 Loading Assumptions - Case:2...........................- 17

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3'. 3 ') Loading' Assumptions - Case 3........................... 18 3.'41 Loading AIssumptions'- Case 4........................... 20 4.1 Bus 1and Equipment Term'inal Voltages. Case 1........... 24 4.2- Bus ' and Equipment Te rminal Voltages - Case 2. . . . . . . . . . . 25 4.3 Bus and Equipment Terminal Voltages - Case 3. . . . . . . . . . . 26

4.4- . Bus' and Equipment Terminal Voltages - Case 4. . . . . . . . . . . 27 ,

., 4.5- ;Bustand. Equipment Terminal Voltages 1 ' Case 1A.......... 28 4.6J l Bus and Equipment Terminal Voltages - Case 2A.......... 29 4.7 Bus and Equipment Terminal 1 Voltages - Case 3A..........-

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, '4.8' iBus and~ Equipment-Terminal Voltages'- Case 4A.......... . 31 J5.1 ~ JPredicted Voltage-Vs. Measured ~ Voltage................. 33 t

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1.0 'I TRODUCTION-

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, : Crit'erion 17 of 10CFR50 Appendix A, ~ " General Design Criteria for

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Nuclear Power Plants" states.In-part that:

"an onsite el'ectric power system and an offsite power system

.shall be provided to permit functioning of structures, systems, and components important to safety. The safety

- function of 'each system (assuming the other system is not

~ functioning)'.shall be.to provide sufficient capacity and.

capability to assure that~(1) specified acceptable fuel design limits and design conditions of the reactor-coolant pressure boundary are not exceeded as a result of anticipated

, operational occurrences f and (2)' the core is cooled and containment integrity and other. vital functions maintained in the' event of postulated accidents."

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An incident at Arkansas Nuclear One has brought into question the

- conformance of that station to Criterion 17 regarding the station electric distribution system design. Consequently the N?c has required all power reactors to review their electric power systems to determine if the offsitd

, power system and the onsite distribution systen are of sufficient capacity to' automatically start and operate all. safety loads, assuming that all onsite ac power sourcea are not available. (This directive to all power reactor licensees is included as Reference (a)).

This report presents the results of our review which demonstrates

' the adequacy of f the, station' electrical distribution system at Vermont Yankee.

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2.15_. Description J

1Th'e Vermont Yankee Auxiliary. P'ower System is shcwn in Figures 2.1 through 2.'5. During plant operation, power is supplied to,the station

auxiliary. power systemithrough both the unit auxiliary transformer (T-2) '

and through the start-up - transformer (T-3B). The unit auxiliary transformer

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supplies power'to 4160 volt bus 1 and 4160 volt bus 2 while the start-up

- . t'ransformer supplies power td 4160 volt buses SA and'5B. 4160 volt emergency

- bus '3'is. connected' to 4160 volt bus 1 by a normally closed tie breaker and .

'likewise,=4160 volt emergency' bus 4 is connected to bus 2.

Upon loss of the normal power source the stationfauxiliary buses

, are: aatomatically transferred to the start-up transformers. Bus 1 is

' automatically connected to' start-up transformer T-3A and bus 2 is *

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automatically ' connected to . start-up . transformer T-38. Buses 5A and 5B remain

< connected to start-up' transformer T-3B.'

There are six 480 volt buses fed from the 4160. volt buses by 4160/480

. volt'transfor'ers.= m Buses 8 and 9 are the 480 volt emergency buses. Buses 8 and '9 feed motor contro1 ~ centers which supply smaller 480 volt loads.'

2.2 Power System'Vol'tage Requirements -

' The offsite power system ' a nd onsite power distribution system; at 9

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- -Vermont Yanke'e'are designed to provide adequate voltage tcr support the

- operation of,.requirediloads under any mode of operation.

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2.'2.ll Offsit'e Power System Operatinte Voltage Range o

Three 34'5'kV transmission lines'are connected to.the Vermont Yankee

'345 kV-switchyard and one 115 kV. transmission line is connected to the

= Vermont Yankee 115 kV switchyard. .The.345 kV switchyard and 115 kV

.switchyards are,'in turn,; connected through a 345 kV/115 kV autocransformer.

=The.~345 kV transmission' lines are extensively interconnected with.the 345 kV transmission l network in the New England area. The voltage limits of the o

345 kV'and 115 kV systems at Vermonti Yankee are provided in Table 2.1.

Table 2.1

-Transmission System Voltages Minimum. Maximum Expected Expected ,

Value Value

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345 kV' System 340 kV 362 kV 115 kV System- 110 kV 121 kV 2.2.2 -Motors and contactors Motors and contactors used in the auxiliary power system at Vermont'

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. Yankee' require operating voltage between 1,10% of, rated nameplate voltage. .

Thef basis for the 10% operating range are NEMA standards; however, the

> Core Spray Pumps and RHR Pumps.were specified to stiart at 80% ofLrated b nameplate' voltage. Th'e minimum and maximum. voltage limits for motors and

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contactors..are provided.in Table 2.2.- -

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< Motor 'and Contactor Voltage Requirements

-Minimum Maximum Minimum Required Operating Operating Starting

' Voltage . Voltage Voltage (volts) (volts) (volts) 4160 Volt System 4000 Volt' motors 4400 3600 3600

-(general)

RHR Pumps ~ 4400- 3600 3200

- Core Spray Pumps 4400 3600 3200 1480 Volt System 460 volt' motors 506 414 460 volt contactors 506- 414 370 (conta'ctor pickup) 322 (contactor dropout)

[" 2.2.3' Undervoltage Relay Setpoints

, Due to the critical nature and the requirements of the loads on the emergency buses 3 and 4,za loss of voltage sensed by undervoltage relays

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-will result in completeTi solation of that. bus from its normal source of

' supply'and starting of the associated emergency. diesel generators. The unde'rvoltage relays are set to operate in 1.25 seconds upon complete loss of ' power land' to operate in '6 seconds with 41% of rated -bus . voltage. The relays-will not1 f operate with voltage above 46% of rated bus voltage..

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LA'dditional undervoltage sensors have been installed on' emergency

, ' buses 3,J4,:8 and 9'to actuate at-a. voltage above the minimum required l operating voltage .of equipmentito protect the lsafety ' loads against

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'undervoltage1 caused by; degraded-grid' voltage. . These sensors will. provide-

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PA- The 10.second time delay _h'as been proviJed to eliminate spurious pickup ;

on short. duration. voltage transients on the' transmission grid or'on the s

Jauxiliary power l system. , The operator has been provided w'ith instructions.

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on; the : action required should the above degraded voltage ' alarm be received.

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s 3.0 ANALYSIS

~3.1 ' Problem Statement

- Reference (a) requi ed that analyses be performed to determine the voltage:at each safety load, assumIing the need for power is initiated.by

.an antii c pated transient ' (e.g. , unit trip) or an accident, whichever presents the largest load demand 'The analyses' must consider all actions the electric power system is designed to automatically initiate including automatic transfers ~of-bulk loads from one t ansformer :o another. Furthernore, the analyses shall be based on the -assumption that the grid voltage is at the

" minimum expected value".

-In' order to comply with these requirements, three cases were

- developed and evaluated:

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.. . Casejl simulates the voltage drop caused by transfer of auxiliary loads from the. unit auxiliary transformer to the start-up transformers with

simultaneous start of safeguards loads. At Vermont Yankee, an accident signal initiates a turbine trip which then initiates the transfer and start of safeguards loads. . The effect of transient inrush currents

- caused by transfer-are superimposed on the inrush currents caused by starting of'safeguardsLloads.

-Case 2. simulates the voltage drop' caused by the start of safeguards loadsLfrom the. start-up transformers with no transfer'(plant auxiliary load! powered;by the start-up transformers).

4 Case 3 simulates the steady state operation of the safeguards loads

andJother' auxiliary.: loads powered by the start-up transformer.

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- Reference. (a)L also. requires that analyses be performed to determine o

the. maximum voltage'at the terminals of each safety load. The analyses shall be' based on the grid voltage at the maximum expected value and the plant' load'at the minimum load level. In order to comply with this requirement,' Case 4 was developed and evaluated.

Case 4 simulates steady state operating voltages of auxiliary loads powered by the start-up transformers.

3.2 -Method A~ computer solution of a load flow calculation is needed to determine each' bus voltage in a power system because an iterative algorithm is required to solve numerous-simultaneous equaticos. Load flow computer programs

. require as input such parameters as the load at each bus expressed in watts and vars and the impedance between each bus in the system. A model of the system containing all-loads and impedance values must be developed to provide this information.

Yankee Atomic Electric Company has performed the required voltage fanalysis in cooperation with Rhode Island, Eastern Massachusetts and Vermont

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t- Energy. Control (REMVEC). REMVEC fs responsible for controlling generation f and bulk transmission for electric utilities located .in the above areas.

IREMVEC,1in order'to, perform its load dispatch functions,. performs. daily 6

load l flow studies of the New England grid using the Power Systems Simulation

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Package,' PSS/2, of Power Technologies Incorporated (PTI). This program

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package uses the Newton-Raphson.and the Causs-Seidel techniques which are tusei extensively for' load' flow solutions'by,the electric industry. The 1

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1PSS/2 program package can~ solve.both ateady state.and dynamic ~ power system e-- studies;sincluding standard load flow studies, load flow. switching studies, transient.stabilityfstudies and motor starting calculations.. The program t

. sof twareJpackage is the property of: PTl and is proprietory information.

3.3t ' Assumptions Figure 3.1is'a;representationofamodeluhedfortheVermontYankee load flow' studies. .This representation shows the plant connected to the

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sta.t-up transformers. Special node numbers have'been assigned for use in'the' load flow program; these are enclosed by-hexagons on' Figure 3.1.

A group of loads assumed to be' connected.to a particular bus is represented on Figure'3.1 by the word " load" enclosed in a rectangle.

3.3.1 ~ : Impedance Model-

. , a) The cable impedance.(resistance.and reactance) to the terminals of each safety load supplied from 4160.V switchgear buses 3 and 4 and

'480'V buses-8 an'd 9'was calculated.

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.b) The' cable impe'ance d of at.least one representative load was calculated

.for:each emergency motor control center. The representative load was

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selected as the load that.would~ experience the worus. voltage drop.

c)? ~l Cable; capacitance was neglected.

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Id); Transformer impedences were obtained from nameplates. )

e) f Tranuformer-(tap' settings were verified byLinspection.:

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. e G II ~ 0@ i LOAD FLOW MODEL VERMONT: YANKEE NUCLEAR POWER STA.

2 FIGURE 3.1

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.'3.3.2c Maximum' Load Model'

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The loading. assumptions for' Cases '1,- 2 ;and- 3 are presented in Tables rf. - m.

F- y 3.1,13.2 and 3.3.)respectively.-: The(fo11owing assumptions were used to

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[d,eveloptnesetables:

a)- The-maximum . load was determinedito exist when an accident occurs without

[losk of' of f aite : power.

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- b) Motor watts 'and .vars were conservatively calculated .by using nameplate

' horsepower instead of the actual horsepower required.

.c)- The;1oading for-the 4160.V system was determined fron' discussions with plant personnel, review of-~ plant procedures and review of schematic: diagrams.

'd) 'The 480. volt system-loading was determined by-a review of echematic L- diagrams and.by1 conservatively assig.ing load factors to intermittent loads.

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e For motar starting studies, all loads are converted to. constant real

, : current and constant. imaginary' reactance equivalents. -This conversion results in' conservatively low voltage' drops because all resistive loads care treated.as~ motors.-

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- , f)i 1No load' shedding occurs.

g) : The analysis:is based ;on an ~of fsite power ' system operating voltages' of-340.kV for the'3.45 kV. system and ofl110 kV for the.115 kV system s

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.Loadino Assumptions - Case 1 p"i ~ ! Conditions: Maximum Load -

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Transfer-to Startup Transformers p y s Start Safeguards. Loads-

. Steady State; : Loads Starting l Node- ..

Loading Before ' Simultaneously with--

j ' No . * . 1 Description Transfer Transfer ,

y; ~ .

-3 i345 kV Switchyard'

, . N:: 4 115 kV Switchyard 8; c4.16 kV. Bus 58: ,

9000 kVA

~

11 ~ : 4.16 kV Bus 1 _

11,125 kvA

.12 ~ . 4.16 kV Bus 3

-f '13 ;4.16 kV &;s 2-- 13,725 kvA-

~

14f {4.16 kV Bus-4:

, A"

.17 Station Service Water PP P7-lD. 250 hp

,18~l" Core Spray PP P46-1B 700 hp c19.. Residual Heat' Removal Pump P10 ID 1000 hp-

. 20 ' Residual Heat Removal Pump P10-1B 1000 hp.

21.. Station Service Water PP P7-1B . 250 hp 25~. Station Service Water PP P7-1A 250 hp 271' Station Service Water PP P7-lC 250 hp 28 Core Spray PP P46-1A ~

700 hp 29 .' Residual Heat Removal Pump P10-1A 1000'hp-30 Residual Heat Removal Pump P10-lC 1000 hp-1 31 '480 Volt Bus 8 *

32. '460 Volt Bus 9 33- Control Rod Drive Water PP- 250 hp

35. . Reactor Building Water PP 125 hp

,37 MCC 8A 20 kVA

^ ? :38 : MCC 88 44 kVA 23 hp"

-39 MCC 8C. '

10 kVA

' 40 .' MCC 9A :

95 kVA 10 hp 1

Ali MCC 90.- -155 kVA 21~hp 4

' 42 < MCC 9C 25 kVA :-

, _ -43.1 Standby Gas Treatment Exhaust Fan REF-28 .

10 hp.

T441 Battery Charger.BC-1-1A.

16 kVA -

-48'fMCC 8E- - 25 kVA

.52 4 Core Spray.PP Discharge Valve V14-llB: 8 hp L53 Chiller Compressor SCH-1 . .74 kW. . . .

~

s

55 :! Reactor Recire Unit RRU 5 hp j m j

~ ' '.58 : ' Diesel Generator IB Auxiliaries ' . 20 kVA- .

i

.601 Diesel Generator. Room Exhaust Fan TEF-3' . ~20 hp '

61 ? Station and Instrument Air Compressor Cl-1A- q

75.hp i

& s J

'1

. ,;64:i Battery Charger BC-1-1Bi . . ., '16 kVA 68--'Cere Spray Pump Discharge Valve Vle-11A : -8 hp-69 -; Reactor Recirc Unit RRU-7 l c5 hp- <j

^. 7.70 : M:C 90 . .

. . ~ ' S kVA J 572i; Diesel Generatcr IA Auxiliaries l74 'Sta.;and Instrument Air Comprressor Cl-1B r 720 kVA 75.hp -

c y

]

M: . . . , - r. .. ~. , .l,. ..

W. ? .:-76.' Diesel Generator Room Exhaust Fan TEF-2.- 20.hp j

'y e: ,- . .! . ..

M..See Figure 3.1F '

i

p '

. w '~

< ~

.1 w :: _.

~

q .. p ;

a k '

f ., ,, ,

. 2,- , : \,ggy : '

a

W ,', . . . . .

r r ,,

p.-- , ,

, q y ,

F .L ' i, 2 %'

.,,; W . * .

~ ~

P' > ( ,

, Table 3.2-

' , j r- Loadino Assumptions - Case 2;

'M '

TConditions:! Maximum' Load 1 .

' ~

A- 7.Startup. Transformers Carrying Auxiliary Load

Startup Safeguards Loads

' Steady State : Loads Starting .

' Node. . . . . . . . Loading Before Simultaneously with.

-No.*: : Description, Transfer -Transfer

,*..s..

l3$ 345 kV S'witchyard:

4-- ;115 kV Switchyard -

,-8 :4.16 kV Bus 58 9000 kVA~

,. ' 11 ; 4.16 kV Bus 1-11,125.kVA

' m _

cl2 :4.16 kV Bus 3-4 *

-13; 4.16 kV Bus 2 13,725 kVA:

' ~

il4 - :4.16 kV Bus 4 -

'171 : Station Service Water PP P7-lD 250 he (18 Core Spray PP P46-18 700 hp

^

19_ , Residual Heat Removal. Pump P10-lO- 1000 hp

' 20 ~ . Residual Heat Removal Purp P10-1B 1000 hp

' 21 - . Station Service Water PP P7-18' 250 hp I

~

25 . Station Service Water PP P7-1A' 250 hp 27 Station Service Water PP P7-1C 250 hp, 128 : Core Spray PP P46-1A .700 hp-O*a : 29 -

LResidual Heat Removal Pump P10-1A 1000 hp - ,

30 - Residual Heat Removal Pung P10-1C.

1000 hp.

31 - :480 Volt Bus 8 .

2321 :490 Volt Bus 9 33; . Control Rod Drive Water PP. 250 hp' 35 .; Reactor Building Water PP. 125 hp (37- MCC BA ' 20 kVA

33 'MCC 8B:- '44 kVA 23 hp

.- 39- ~ MCC BC ' 10 kVA" I40' ' MCC 9A' 95 kVA ' 10 hp

.~ ~ : , _41 . ;MCC 99 155 kVA 21.hp.

. 42 MCC 9C' 25 kVA

.:43 iStandt>y Cas Treatment Exhaust Fan REF-28 10 hp -

44 Battery Charger BC-1-1A 16 kVA 148 : .MCC 8E 25 kVA.

e '52J, ' Core Spray PP 01scharge Valve V14-llB . 8 hp

, :- 53 Chiller Compressor SCH l' 74 kW X J 55 f , Reactor Recirc Unit RRU-8' 5 hp

_ .' _ 158 : Diesel Generator 18 Auxiliaries 20 kVA 60 J , Diesel Generator Room Exhaust Fan TEF-3 20 hp-

-611 Sta.-and Instrument: Air Compressor Cl-1A 75 hp1

64 ' '; Battery Charger BC-1-1Br '..- . .

. 16 kVA-

., 168 . > Core Soray Pump 01scherge Valve V14-11A< . 8 hp

,s .- ,

'69 Reactor Recirc Unit RRU-7? >

J : 5 hp '

' ~

F70:. s iMCC 90 L: .- .._., - 5 kVA

' 72. _ -Diesel Generator.lA Auxiliaries ~ :20 kVA-

74l , Sta.land Instrument Air Cor: pts?Ssor Cl-10: :75 hp' ,.

h1 _ 4

\ :!76) I Diesel Generator. Room Exhaust Fan.TEF-2J 20 hpJ e u

,~ ',

Q a*:/SeeFigure3.1;

'r- ,

u ,

i I ,e 1

.g

, - ., s ;s l., + ' , _. ,

} ..z.Y I'. ' .: , o-b) '

'u a- _

"I 7* , -)

g.'

-=

15, . 4 o '

, n .: _. _ ;

< a :n .. ,

l$ '

^

ny ,

qf '

, ~

h~

[ i. Table 3.3 I'

~

Leadino Assumptions -' Case 3 f

4 ~

~ Conditions: Maxinun Load ~

.Startup Transformers Carrying Auxiliary Load

~

- : Node V . Steady State'

- r - 2

-No.* JDescriptiond ~Loadino

3. ^345 kV Switchyard -

4 i , 1115 kV Switchyard -

$ i8 :4.16 kV Bus 58.' ~ . 9000 kVA .

51D -4.16 kV. Bus'1f ; 11',125 kVA' 112 . 4.16 kV Bus 3:

?13: -14.16kVBus21 '13,725 kVA 1

14 : -:4.16 kV Bus 4

n. .

, :177 : Station Service Water PP P7-10 250 hp_

18 : . Core Spray PP P46-10: '700 hp

' -2 -

as 19 -. Residual-Heat Removal Pug P10-lD-

'1000 hp 20 : ' Residual' Heat Removal Pump P10-18 '1000 hp 1 21- : Station Service Water PP.P7-1B . 250 hp.

-25 Station Service Water PP P7-1A- 250 hp y~ 1 27 - Station Service Water PP P7-lC 250 hp.

28 . Core Spray PP P46-1A- 700 hp.

',./

/ 29 :. . Residual Heat Removal' Pump P10-1A 1000 hp

p .

l30 -Residual Heat Removal Pump P10-lC- 1000 hp

480 volt Bus 8L

. 31 - *

~.. 32 400 Volt Bus 9-

? ~

?

. 33 :- Control Rod Drive Water PP 250 hp

/35

~

--Reactor Building Water PP' -125 hp

~

J372 MCC 8A 180 kVA

's . 2 1

. 38 -. ?MCC 88. 67 kVA.

39 K C-8C. 10 kVA

^

40 - MCC 9A- ~ 100 kVA - j

MCC 93 C 150 kVA6 - j 42' -MCC 9C -

25 kVA 1 43 Standby Cas Treatment Exhaust Fan REF-28 '

10 hp

'44 ; Battery Charger BC-1-1A: l 16 kVA 48 ;} ^MCC BE -

i 25 kVA

~$2 u-JCore Spray PP Discharge Valve.V14-llB <

.f- '

' 53 - 1 Chiller Compressor SCH-1 1 74 kW 55: Reactor Recirc Unit RRU 5 hp i

~

J58I .dieselGeneratorIBAuxiliaries -

20 kVA d

~

t 60 ~ _; Diesel Generator Room Exhaust Fan TEF-3 20 hp-

,61; qStation and Instrument Air Compressor Cl-1A .75 hp, 64$ Battery. Charger BC-1-!B .. .. 16 kVA _i

68 1 -Core Spray Pump Discharge Valve VIA-llA<

o ,

, T69 , (Reactor Recire Unit RRU +

5 hp c: ^ % +

~

. ;70 7- ;MCC 90. .. .

. .. . 5 kVA; e - 72 c ~ Diesel Generator IA' Auxiliaries .

20 kVA t.74 t iStation and Instrument. Air Compressor Cl-18 .75 hp- -t

.a. .

~

s76- Diesel' Generator Room Exhaust Fan TEF-2' '

.20hd -

51

?f2? , 0:d ' , k+[See. Figure 3.1; _

^

. + ,, s

,s .j i

gy~ '< &'

, .Si c , ,

, _ 3- .

m

{ ,.

-- f ."

o- l ,;x, s

~

?l . . ? ': -t

v ' . . , _

hh?

~

i=1W

w;, wy 'y,a*

li; j : 't

" Jij. , , , ' .-

s

'l

.\

,y.:: ~3.m s '

' g; , ,

tr7 ; f. . ,

y

- p . - - ,

j

. 4

-[I : 3 l3.3d[LMinimum:1.oad Modelt :

is , 4 s _ j

$g y .

-l h d:- $The--lhading assumptions for, Case 4 are presented in Table 3.4.

LThe!following Jassumpt' ions were'used to develop this table:

~

, ]

. . q -1

' ~

ya)- ;In' developing;the minimumiload model, the plant was assumed to be at b

Jcold; shutdown ~'with minimum operating' load'. .This.-load' consists'of three

~

.l

. - F.. .. .

- station Eservice: water - pumps, : one ; residual- heat removal' pump, fone . RHR.

' service water pump,' lighting' load, and various other 480 volt system .

^

iloads.

b) . <The analysis is based;on an offsi n power system operating voltage-

.'of 362 kV for. the' 345 kV' system and 121 kV for the 115 kV system as

~

provided-in Table.2.'1.

s

.-~ . , Q T

..']

.9.'

h _-' -'

s <

d

. p..

b .',[

a ~

~, '-

mh, )-

t s g . ~ k g h v

,_ l ,n-#

, ;+

+

.,,t- y * .

4

.f. * = -

-J.f -

< l- zw. ,

_

' i -?. M i 7, ,

?

f

. g.%

i- ' n e, a'-

_19 v j

$ * '; { j. .

m u

y, .

1.

g('

+ 7

- 2 at , .

if -

s q?.~ n

' ~~' -

QGW? {, ( '. , ,

(.

~

' ~

' Table 3.4

~

.N --[ .

+

- L'oadino Assunctions - Case 4

. , ;w >

,, . .i ,> ,

. Conditions: . Minimum Load. .

~

JStartup, Transformers Carrying Auxiliary Load

^

UNode '

i

= Steady State No.* Description ~ Loadino-

.3 - l345 kV Switchyard:

RJ 4 -1 115 kV Switchv.sd.

8 ?4.16 kV Bus 58 i '11? ' 4.'16 kV Bus 1 -1333 kVA 12 L4.16 kV Bus 3;-

p- - 13 .. 4.16 kV. Bus 2 : 1333 kVA

', 14' - 4.16 kV Bus 4- .350 hp 17 LStation Service Water PP P7-lO ;250 hp' 18 ' Core Spray PP P46-1B' 19L : Residual-Heat Removal Pump P10-lD.

'20 Residual ~ Heat' Removal Pump P10-18 1000 hp-21 Station Service Water PP P7-1B.

~25 .- Station Service' Water PP P7-1A 250 hp Station Service Water PP P7-1C.: 250 hp Core Spray PP P46-1A

'29 -Pesidual Heat Removal Pump P10-1A

. . 30 - : Residual Heat Removal Pump P10-lc '

E *) > 31- 480 Volt Bus 8 540 kVA ,

. 32 - 480 Volt Bus 9 540 kVA .

O. , 33 - -Control Rod Drive Water PP g

'.351 Reactor Building Water PP s N/ " 37 , FCC BA 38 : MCC 88

39. DCC 8C :

.,;.~~;

40 MCC 9A f~ c417 MCC 98' '

'42: : MCC 9C

v. .

E43 Standby Cas Treatment Exhaust Fan REF :44'.

" Battery Charger BC-1-1A

,f 48 6CC 8E i u' ~

52 i Core Spray PP Discharge Valve V14-llB' i 53 : -Chiller Compressor SCH-l -

. 55 .-Reactor Recite Unit RRU-8.

158 s ,

1 Diesh1 Generator' 18 Auxiliaries '.

.

60 - : Diesel Generator Room Exhaust Fan TEF 4 - <

614 ' Station and Instrunent Air Compressor Cl-1A

.; 64 Eattery Charger BC-1-1B .

, 68~ : Core Spray Pump Discharge Valve V14-11A

'69'

. Reactor Recirc Unit RRU-7 Y

.c ; 1 "

- L707 - FCC 90 .- .. .

m (72 ' (Diesel Generator lA Auxiliaries 4 (74; 1 Station and Instrument Air Compressor Cl-1BJ '

. ].4:;,e.)., ,

p<

e ' - -

9 ; ;

i yy .j '.'d. , ~ : . - - c - c, , .. - g a -4.0iCONCLUSIONS a: iThe results of t'.'.e'. voltage. study for Cases 1, 2,!3 and 4 are spresentedEin Tables 4.1, 4.2,'4.3 and 4.4 respectively. . These tables contain -operating or motor: starting. voltages (as applicable) and the allowable x , ~. voltage range.- ~ 'The Caseil and. Case 27 results provide the maximum voltage drops , whenisafeguards= motors are required to-start. These results show that . . voltages-in the 480 volt, system drop momentarily.to slightly lower than - acceptable values. Case 3' reveals that,'under worst case loading,-the voltage for some loads fed from 480 V Bus 9 is~below the minimum allowable voltage. This . ~ low voltage condition exists'when the startup transformer which feeds Bus - 9 also feeds the closed-cooling system loads;(Eus "3). Case 3 also reveals Lthat the' voltage for ' continuous operation of all other loads is within acceptable limits. Case l4- reveals that under~ extrene light load conditions in the plant, togethernwith extreme system-high voltage, the voltages for the station ~ , service water pump motors exceed by 1.4% the allowable high voltage'limi,t for 4000 volt motors.t , . The(low voltages calculated under worst case heavy loading and the 'high voltages calculated under extreme light loading were reported by . Reference!(b)'i LER 80-11/IP.; 'In order to alleviate' these ' potential high ~ --and. low voltages, a. proposed-transformer 1 tap change was investigated.. 'g '/: ~

O ; m e v

/ -21 E , 4 + s - [l _ [ }.! l 3: yp . E,.', (Cases 1: 1,y2,E3'and.4?wereirepeated'with~the taps'on start-up-m: itracsformers l3A' and j3B] changed to the .115 kV- tap and the taps on transformers- .i -8 and 9 changed to.the 4'056 volt tap. : These.new cases are called-1A, 2A, - , (3A and 4Al LThe results of these. cases'are provided in_ Tables 4.5, 4.6, ~ Jg.7and4.8,jrespectively.- , Tables 4.5, 4.6.and 4.7 demonstrate that under worst case loading ~ ' /thefvoltage is sufficient to start.and operate all loads. Table 4.6, Case l 2A,.l.results'show that. voltages'in the 480 volt system and voltages for some ~ ~ ~ q s operating 4160 volt system motors momentarily drop to slightly lower than -acceptable values.when~the-large' safeguards motors start. This is of no concernfbecause. sufficient voltage exists for acceleration of 4000 volt safeguards motors. As the large safeguards motors accelerate (typically one to two: seconds) voltage in the 4160 volt and 480 volt systems will ~ c . recover.sufficiently te ensure that'all loads will have acceptable voltage.

Table 4.8' demonstrates that under extreme light load condition, voltage

is within the maximum voltage limit for the operation of all-electrical i

equipment.

' ' Transforne'r taps lfor start-up- transformers 3A and 3B and the 4160/480

^ volts station .~ service. transformers will be . changed before- the plant begins closed cycle cooling. . Because the' potentialolow voltage exists only when .the' plant is in;theiclosed cooling mode, this is not of immediate concern. The study of'the: auxiliary power system.at Vermont Yank'ee was made -usingF the. worst / case loading, minimum expected grid voltages and other conservative assumptions. Therefore,5we conclude:that following the . completion:of the proposed. corrective action to the transformer tap settings-- . o; K i e 4 T d 9 N TW & ,. : 7., - r- ^ g; .. g r.~>n - w s , , . - , . v, . ~ " "p~ n, - - - - , . . ~ >F :~' ' - ,. ( .z;3 + 'M r $;MM c ', ' L;p*T-- -:v ~ , "l'R[i. ' 3: r.yi'.c' ~ .s T. - - a %igy 9.!; "_ .% jm e' _> z g& q) g ye y< .gr , t , i ' u, y._ z y 's _. . .; <._ .y. , , . t -: , . , , u, . . , _ ,, m .m.. 4: T% n': i k ';

L ' *~ " -

.-'g.. , t . ,' 4,k k " I . 't f..' bi-. A $- ,r-. y

, .* . . - * <. , .. T. c. .. .. ,- , , . . . . . ,

+ i -'. . .;' t~ , 1 J d,. ?.4the? auxiliary / power lsy_ stem st Vermont; Yankee is' of- sufficient; capacity.(toi . ~- r, q... . - .a f y **.. %_, fautomaicallyistart"andoperate.allEsafety(loads,;:assumingthat;all.onsite t _ , - - - ~ o - , '1 ,g 5 .-- 1.- .ui t - g. : s , , , -, -., m . ., .. , 4 ~- - m A'.rs1.sW.-. "power.systemsrare:not-available.: . . -- 's Q- '".:.D. .1,

e. 7pd[ '__; .'.

~ ,. + . , , . m t: , .'t'.~ 1 4 ~l ' x .. .,J r-- - , b- ff[ 4 I =4e a -h, .,; G , % :" _ _ , . .'"'*I - 59. 1 i a" l 4 t3, -^.. - .w ,s d- =7 ,,,.

* { f 3

+ , , ,. -- s A L f. [j,'^-.--gy - I .[. . . s T 4 '~ . . ' { , , .^ ) (r. _ e % I z - , _ 4 .'.? ,n.- 7 y 1 ' ,.' -J% P ,, + - 4,,, , $' .,'g., , I ~ ^* N y y ; O h '-- '( L

At - < +

c t "-h'b. ' ' ^'. -- f _' .p',:' ) A Y 1 i b,'; ., . . 'm E y ' [ 'h

d- . ,' $

.z" .L "+ _.{ e l v- ~ * .e S- + e V > s= '- - t 4 ' _. iw e 'e . f I a iP ~.r. , A-*e.l. w E- - ,+ .g- +- 4' ' .a. d.O f ' 7 A.

i

.' "- , _- i , !

a L -c: ,$ E . % m: 1% .. < . ? . b 'T 9 ~,hf, /'h.

y s, . - -

.e.-_ ', 2

2 2 e :- - - ,- y

.'? $ , m = mf ,-' ? _a > + u, 9 7 .g , Y-r m_ [.- - v.__ , '., g

s ,

y g. . t s 4 r , i,I ' 4 ' --- ~ - .glA ^ . .-;L : > ,p + ,w ., ,h _',~ . -h. . > s 4 t -1+=_.- e - - Y r l' b $Q _ f, .g > . -x a %.;y((l Vf _ ls ,

, . .w - 1 * . ,

s. n., , .*

,M~' a + ^ y [J ' t - ' %'; ' y * - '"Q ' ~ \ g _. Y,_ mw 'f,Y x-9

n. q' wn b.( ,

7 ' < ^ e ' , ~ Q

; - c .v . 8 ,

. - .-_;g .. . " 3 n 7 . .m ,N y ~ > n:z ; ; ,ns. ;, - e.Y cr 4 ? .y:.,, 1 " N n; ,. y, , 'p ' u e :. ' , . . . . , < ~p _ c; . , p.a -4[ ,y d- ,-, } i_, . .m .s] c~ j ; s t .' .' 9'- 4 ,. _ s, .- , , .- [, - . . - Y. . -. 4. 1 3 _g I* y - ' k ,- s , _' c y. . 'f. h _ ~

f. - -s

* ..d,-

^~ h.h) ~'e'~.#y, ._,.. -. +, \,-

, , *m 7 < L.

g . . . - , - --, f. .s' t i t,-jy ',*.; ~ 9 I..' k' ._ R 4 ,&% .,. % ,. : m. f, , ,,' .. * .4 g b b r y r.sb .7 2r-s ., . , - .a4a- , ,.=r ', W 6- e w . - , . , e ,, , , n w [.', , y ,,.#.g ,,-.en.f- ,,,4,,,',,.,-hw-y , y %. .w.$,, .7 & .,;:g ; y + ' ~

' ng]

^ 7 _ _ n:3, , N.N , ' 3i .i s :~ . , ^

W .

p' ~ -[ - Table 4.1; y , ' Bus and Equipment Terminal Voltaces '-' Case 1 : .g - p . ~ -; ^ JCondiilons:'?MailmumLoad-

Transfer to Startup Transformer >

b ' iStart Safeguards' Loads ; s .x Allowable L -w Nodev ~ Voltage Range:(Volts) No.*: Description _ 'Voltace (Volts) (Sec. 2.2) 13 - 1345kVSwitchyard. -340,000' '4' (115 kV Switchyard- 110,000 , ;8l " J4.16 kV Bus 58~ ,3,744' '11; 3416 kV Bus 1 3,762- - 12 c : 4.16 kV' Bus 3-~ 3,756 - J13? 4.16~kV Bus.2< 3,738-14 l4.16 kV Bus 4 '3,732 - - 17; Station Service Water PP P7-10 3,756 4400-3600 l18' Core Spray PA P46-1Bl 3,711 - 4400-3200 19- ' Residual Heat Removal Pump P10-10 3,703 4400-3200' ^ ' 20 ' Residual Heat Removal Pump P10-19'. 3,714 4400-3200 21 ; Station Service WatJr PP P7-1B - 3,756 4400-3600 125 ' Station Service Water PP P7-1A' .3,732 4400-3600 27 cStation Service Water PP P7-lC_- ?.732 4400-3600 2,8 - Core Spray PP P46-1A ' 3, 116 4400-3200 29: Residual' Heat Removal Pump P10-1A 3,713 + 30 4400-3200' ' Residual Heat Removal Pump P10-1C -3,705 4400-3200 ' 31, . 480 Volt Bus'8 411 32 . -480 Volt Bus 9- . 414 . . - :33 . Control Rod Drive? Water PP. 410 506-414 J35 : Reactor Building Water PP 413-506-414 137 = MCC 8A ' 411 506-414 38 MCC 88 39 , t 410. 506-414 . MCC BC~ 401 506-414- , c 40 :- ..MCC 9A 414 506-414

. 41. MCC 98

~ 413 506-414

42 MCC 9C' All 506-414 143 : Standby Ces Treat. Exhaust Fan REF 408 506-414 44 . Battery Charger BC-1-1A.

x48 All 506-414 . MCC BE:- 410-306-414 152 ^ . Core Spray PP 01sch. Viv. V14-llB 409 506-414 c 53.- .Ch111er Compressor SCH-1 409-455; 506-414. L' Reactor Recire Unit: RRU 409 506-414 r ' 50 : -Diesel Generator 1B Auxliaries 401 506-414 ~^ E 60 - - iDG Room Exhaust Fan TEF-31 400 .506-414-l61 Sta. and Instr. Air Compressor Cl-1A- 398 . 506-414' ~ [64) Battery Charger BC-1-1B'i.-- ^ '*' ~,. ' 414- 506-414; 68 : Core Spray _ Pump Disch. V1v. V14-llA1 69: :413 '506-414 . Reactor Recirc Unit RRU-7s 412 506-414- - ,. m " 'r > t 70 ? 1MCC 90 1 . . 413L 506-414~ 72 , : Diesel Generator,IA Auxiliaries- 4111 3741 - Sta.'.and Inst.cAir Compressor Cl-101 410' '506-A141 506-414 - NK' ' f 576h DG[ Room Exhaust Fan TEF-2 -- ' 410 I .506-414-1 04 +: .,*6 See Figure 3.1 < ~ p,. , , , i r ~ , *i ~ , (+ a r - / E[ - ". 'J_ '.[ ' ~ - Th , , 1_ - N ' m :- _ ,r . tt '~ t -ky , ; , , t 5^ , ' Table 4.2 ~ 1 Bus and Equipment Terminal Voltsces - Case 2: ~ .' ~J Conditions: !Masimum Load - " Startup Transformers Carrying-Auxiliary Load ~ + Start Safeguards Loads - Allowable Node. . .. . .. .. - -Voltage Range (Volts)' 'No.*1 .Descr!ption: Voltage (Volts) (Sec. 2.2) !o" c 3-- -L345kVSwitchyard- 340,000 L. - - 4- 115 kV Switchyard 110,000

8 4.16 kV Bus 58 3,665 ill 4.16 kV Bus 1 .3,723.

..x t "' - , ' 12 - '4.16 kV Bus 3- -3,717 '_ : 13 ;- - 4.16 kV Bus'2~ 3,651 - ,i. 4.16 kV Bus 4. . .. 3,6511 17 Station Service Water PP P7-lO - 3,716 ,4400-3600 l18; Core Spray PP P46-1B 3,673 4400-3?00-19 Residual Heat Removal Pump P10-1D. 3,665- 4400-3200 20 -Residual Heat Removal Pum P10-1B .3,676 4400-3200 21 Station Service Water PP P7-1B' 3,716 4400-3600 25- Station Service Water PP P7-1A. 3,650 4400-3600 ' 27 Station Service Water PP P7-lC 3,651 14400-3600. ~ 28 : Core Spray PP P46-1A- 3,638 4400-3200' 29 ^ Residual Heat' Removal' Pump P10-1A . 3,633 4400-3200

30' . Residual Heat Removal Pump P10-1C 3,624 4400-3200

-. 31 480 Volt Bus 8 404. *

32 480 Volt Bus 9; . '401 33 Control Rod Drive Water PP, 401. 506-414-35 - Reactor Building Water PPl 399 506-414'-

~ L37i MCC 8A - 404 506-414 J38 'MCC 88'- 401- 506-414 39L MCC 8C- 394 506 414 40 ' :MCC 9A-- 401 506-414 141 MCC 98 400 506-414' -42 MCC 9C~ 397 506-414 ' -, 43 - . Standby Cas Treat. Exhaust Fan REF-28 401 506-414 441 : Battery Charger BC-1-1A 403 506-414 s 48: . MCC bE = 401' 506-a14 " ^ ' 52 ' 1 Core Spray PP 01scharge V1v. V14-llB 401 506-414 53 Chiller Compressor SCH-1 399. 506-414 55; 1 Reactor Recite Unit RRU-8 4011 506-414 58 ' . Diesel Generator 18 Aux 111 aries .393 506-414- ' 60 : ,DG Room Exhaust Fan TEF-3 . . . 393- 506-4141 s ?61s _ Stat.'and Instr.. Air Compressor.Cl-1A.. 391" '506-414 ,, ~ 64 7 Battery Charger BC-1-18.. 401 506-414 I < *. '66 Core Spray Pump Disch. V1v. V14-lla- 399~ 306-414- J s ~ 69 1 ;ReactorRecircUnitRRU-7p . 399 506-414'

70

. :MCC 90 .> .. 400. .506-414 - 72: < Diesel Generator'IA Auxiliaries . 396 506-414 , s L74 .Sta and Instr. Air Compressor Cl-181 ;394 # 506-414'. l eN ' 76 ; DG Room Exhaust Fan TEF-2l -395 j$06-414-- ~ .f, ' .*/SeeFigure3.1E - W , p ..' .N',' ; ()- - Li J<v -

. c

ww; 3 . m , ,. 3, x , f ;?..

3

~

.[;

> a. y ) ! m 1 ,* _l, % . _ > g I Table'4.3- $ n[ c ~ Bus and Equipment TerminalIVoltages - Case'3 . , .v Conditions:! Maximum Load' ' ~ , , , . Startup Transformers Carrying Auxiliary Loads-m.. Allowable'L i i Nodel . Voltage Range (Volts) i No.

h ' Description i Voltace (Volts) (Sec. 2.2) r^

- . .3) : 345 kV. Switchyard '340,000 - -4L =.115 kV Switchyard . 1;. .110,000

8': 4.16 kV Bus 581 3,781

$11 (4.16kV.Busl'. 3,922 , L 12 ' - 4.16 kV Bus 3. 3,921 -A.16 kV Bus 2 113.5 : 3,776 .4.16 kV Bus 4: .. . . : 3,775 '

17 - Station. Service Water PP P740 3,920 4400-3600 18 . Core Spray PP P46-1B- '3,910 4400-3600

~ 19 - 'Residu'al Heat Removal' Pump'P10-lO - 3,906 4400-3600 , 20 ~ Residual Heat' Removal Pump P10-1B 3,910 4400-3600 '21 Station Service Water PP P7-ID . 3,920 4400-3600

i c 6 25, Station' Service Water PP P7-1A 3,773 4400-3600 27 Station Service Water PP P7-lC- 3,773 4400-3600 28- Core Spray.PP.P46-1A ' 3,769 4400-3600 29 Residual. Heat Removal Pump P10-1A 3,767' 4400-3600-

30 - ' Residual Heat Removal Pump P10-1C~

3,764 4400-3600. - 480 volt Bus 8- ~ . . s s . 31 - . 427: " 32 480 Volt Bus 9' . . 414 33 ' Control Rod Drive Water PP^.. 421 506-414

35. . . Reactor Building Water PP 411 '506-414-

.37

KC 8A- 425 .506-414

, : 30 .. 'MCC 83. 423 506-414 s 39 _ .MCC 8C: 423= ~506-414 40- MCC 9A 414- 506-414 1' 41 MCC 98 413 '506-414 42 MCC 90 409- 506-414 '43 : Standby Cas Treat. Exhaust- Fan. REF-2B 421 '506-414 ' 44 . Battery Charger BC-1-1A. 425-' '506-414 1 48' MCC 8E' 423- 506-414 ' 52 i Core Spray PP Disch.-Valve V14-11B '423 506-414- . ' 53 , Chiller Compressor SCH. 1-' 421 506-414: 55 Reactor. Recite Unit RRU-B 420 506-414 - ' , 58. ' Diesel Generator 18 Auxiliaries :422 506-414' 3 , ,60 :DG Room Exhaust Fan TEF-3 < 422 506-414 2 61 ' - : Stat. and Instr. Air Compressor Cl-1A ' 419 506-414 ^ J64- 1 Battery Charger BC-1-1B , . . 413 .-506-414- /68 - : Core Spray Pump Disch..Viv. V14-llA ' '413 .506-414 ~ - 69 .: -Reactor.Recirc Unit RRU-7 408- : 506-414-c 701 ~MCC 9D U . , . ... ~413 :506-414 172v ! Diesel Generator IA Auxiliaries r *-

1408 506-414 4

74..: cSta. and Inst. Air Compressor Cl-18.- -- 408 - .506-414 . . . =. . - ; 76 ; eDG Room Exhaust Fan:TEF-2 ~408 506-414-

s . s .

e ..F-6 , e*:;See Figure.3.11 " . l, . k ,. , . s - 3, ~ ) m . .?l ~E- - vp . 7 , -

f!N$ ,

s % ;qq. r- > wy y _ r , h; [y 7 N 4 2 -a gg - - ' '

~ '

q, _ ;3. = . l , .g lpV a W/: ~ K . Table 4.4 Cf ', 'i~.7s ~ , i Bu's'and Equipment! Terminal' Voltages'- Case 4' y g.+ , s

.. ~

~ Conditions n Minimum Loadi. ~ f, 4 s Startup Transformers Carrying Auxiliary Loads! y ' ^ . .. . Allowable' N < l-dode - . ? Voltage Range (Volts) < : it,.* : -Description: ? Voltage (Volts)- (Sec. 2.2)- , 3' :345 kV Switchyardi : 362,000 s 14 115 kV Switchyard 121,000 81 14.16 kV Bus 58 4,458-

-11' "4.16 kV Bus 1- 4.462 5 12 ; .4.16 kV Bus 3 ,

4,461: 13 ' 4.16 kV Bus 7 4,457

14 :-

4.16 kV Bus 4: 4,456' ( 17 ' ~5tation Service Water PP P7-ID_ 4,460- 4400-3600-( 18: Core Spray PP P46-1A- ' 19 5 Residual Heat Removal Pump P10-lO . %: - , i 20.. ' Residual Heat Removal Pump P10-18, 4,450 4400-3600 , '21l Station Service Water PP P7-1B : k _ 25 (StationServiceWaterPPP7-1A- 4,455 4400 *600 "" ., Station Service Water Fo P7-lC - < 27 : 4,455 4400-3600 Core Spray PP P46-1A:-' [ - 29' ' Residual ~ Heat' Removal Pump'P10-1A 30- Residual ~ Heat Removal Pump P10-IC .

T 31' 1480 Volt. Bus 8

'492. ~*: 32 480 Volt' Bus 9 492 33 - Control Rod Drive Water PP 35- , Reactor Building Water PP _ '37 E C 8A' 492- c506-414 ~ 38 -- 1 HCC 88 - 492 506-414.

39 EC 8C.: 492- 506-414 4O L MCC 9A' 492 506-414

, :41' MCC 98 :492 506-414 -42 .MCC 9C' 492 506-414 - L43' ' Standby' Cas Treat.' Exh. Fan REF-2B

44 ' Battery Charger.BC-1-1A '

48 ~ MCC 8E 492 506-414 52 .- .' Core Spray PP Disch. Viv.~V14-llB-

Chiller Compressor SCH-1 --

55 Reactor.Rectre Unit RRU-8^

~' J ' ' 58 / . Diesel Generator 10 Auxiliaries r - 60 ' 101esel Gen.tRoom Exh. Fan TEF-3 ._ , (61 ,Sta.' and Instr. Air Compressor C1-1A. ~7Battery Charger 8C-1-1B:- ~ F64 : _ -- 68 " ' Core Spray Punp Disch. Viv. V14-11AI - l ' 69_ ' Reactor Recite Unit RRU-7' s- . e , i * ~ 70 ? 6MCC 90' ,. i , "492 : 506-414- ~ ~' 72 ' rDiesel Generator-1A Auxillaries'... l

~_ . .

74 ' -

Sta, and Instr. Air Compressor Cl-10s -

~i q M g. ,;n , 176f }00RoomExhaustFanTEF-2i l i (,N -; > ?See Figure 3.1: ' j 9 , . . - k;^ " -r , :R , , + - 5 I ,A _ i g. . . , x. / - - .a f y 5 wm w ,, .- . .- m , p . . t s s . k : ;L ; q~; -. , "' ^ - Table 4.5'- L , JBus and Equ!!A.- Terminal Voltaces - Case 1A. ~ iConditions: MaNimum Load . + ,y ~ - Transfer to Startup Transformers ~ fStart Safeguards Loads r Allowable .

Node .

. Voltage Range (Volts) . No . ' - : Description _ . . . Voltage (Volts)- (Sec. 2.2) ' 3: 345 kV Switchyard 340,000- . .. ' 4 -115 kV Switchyard. '110,000 , '8- 4.16.kV Bus 5B 3,667 q11 ~4.16 kV Bus 1 3,690' - 12 ' 4.16 kV Bus 3 13,684 '13 :4.16 kV. Bus 2 3,661 ' 14 - :4.16 kV Bus 4 . 3,656 17 Station Service Water PP P7-lD 3,684 4400-3600

18. Core Spray PP P46-18 3,640 4400-3200

-19 -Residual Heat Removal Pump P10-lD__ - 3,633 4400-3200 20' ' Residual' Heat Removal Pump P10-1B 3,643: 4400-3200 , ' 21) . Station Service Water PP.P7-1B- 3,684 4400-3600 -25 Station Service Water PP P7-1A 3,656 -4400-3600 27' Station Service Water PP P7-lC 3,656 4400-3600 J 28_- Core Spray PP P46-1A.- 3,642 4400-3200 ~~

29. - Residual Heat Removal Pump P10-1A 3,637 4400-3200 .

.. , 30 -Residual Heat Removal Pump PlO-1C -3,629- 4400-3200 31 ~ 480 Volt Bus 8 426-32' 480 Volt Bus 9 429 33 Control Rod Drive Water PP- 426 506-414 35 -Reactor Building Water PP 429 506-414 37 KC 8A 427 506-414 ~38' - MCC 8B 426 506-414 39- : KC 8C 417 .506-414

40. ;MCC 9A 429 506-414 Alf MCC 98 428 506-414 42- MCC 9C 426 506-414 43 - Standby Cas' Treat. Exh. Fan REF-28 424 -506-414'

44 Battery Charger BC-1-1A ~427 506-414.

48 ' MCC BE -426 -506-414 , 52 Core Spray PP Discharge Viv. V14-11B' 425 506-414 . 53 - Chiller Compressor SCH-1~. 425 506-414 55 ' Reactor Recite Unit RRU-8 . 425. 506-414

58: Diesel Generator M Auxiliaries . 416 ~506-414

60. Diesel Generator A ;m Exh.' Fan TEF-3 -415 506-414

-Sta. and Instr. Air Compressor Cl-1A- ~ 61 . 413 506-414 64' Battery Charger BC-1-1B . . .429' 506-414 f 68 - ' Core Spray P m p Disch. Vlv. V14-llA -428 506-414 69 ; . Reactor Recirc Unit RRU-7' 428 506-414 % 70 -MCC 901 . . 1428 506-414-

,.. .72 ' < Diesel Generator IA Auxiliaries .

427- 506-414-

1 - , ;74- :Sta. and Instr. Air Compressor Cl-18 426 506-414 1' .

V t 76' : DG Room Exhaust Fan TEF-2:- 425: 506-414: , <*1 See Figure 3.1: - ' ' ~ v.- . . .. m 1-- .- [ . c. n L l c_ < w . - . ,3f , i 1 : a.?q -q t -Table 4.6 ~ Bos and Equipment Terminal Voltaoes - Case 2A .. J ! Conditions: 4: NaximumLoad t- ' ~ ., i Startup Transformers Carrying Auxiliary Loads

Start Safeguards Loads' '

%de Allowable No.* ~0escription' Voltage Range (Volts)

,Voltaae (Volts). (Sec.'2.2) 3 ~345 kV Switchy'ard. 340,000.- 4 115 kV Switchyard 110,000 8 '4.16 kV Bus - 3,584 ill- 4.16 kV Bus 1- '3,626 12 - J4.16 kV Bus 3" 3,620 13 4.16 kV Bus 2. 3,576 _ 114, 4.16 kV Bus 4 . 3,570 17 ~ Station Service Water PP P7-lD 3,620 4400-3600 18 ' Core Spray PP P46-1B 3,577 4400-3200 19 - Residual Heat Removal Pump P10-10' 3,569 4400-3200 - 20 -Residual Heat Removal Pung P10-1B ' 3,580 4400-3200 21 Station Service Water PP P7-1B 3,618 - 4400-3600 ' 25 Station Service Water PP P7-1A 3,568 27 4400-3600 . Station Service Water PPP7.1C' .3,510 4400-3600 s., '28 Core Spray PP.P46-1A' 3,556 4400-3200 29 - . Residual Heat Removal Pump P10-1A 3,551 4400-3200 . 30 . Residual Heat-Removal Pump P10-lc , . ~ 3,543 4400-3200 31 480 Volt Bus 8. 414 1 32 480 Volt Bus 9 ,. 416 . 33 - Control Rod Drive Water PP (35 Reactor Building Water PP-All 506-414 413 - 506-414 37 '- MCC 8A - 414 506-414 38 MCC 8B V 411- 506-414 39 MCC BC' . 404 506-414 40 MCC 9A' 415 506-414 , . 41. .MCC 99L 415 506-414

42- MCC 90 c

.13 506-414 43- Standby Gas Treat'. Exh. Fan REF-2B c 44' . All 506-414 . Battery Charger BC-1-1A 413 48 MCC 8E 506-414 All' 506-414- ' 52 . Core Spray PP. 01sch.- Valve 'V14-118 ' 53 Chiller Compressor SCH . All 506-414 409 506-414 55 . . Reactor Recirc Unit RRU-8 All~ $06-414 .1 ' 58 .. Diesel Generator 1B Aux'11eries- ' ' 1 403 506-414 ' 60 ' ;DG Room Exhauct Fan TEF-3' l 61: -403 "506-414 ,Sta.and Instr. Air Compressor Cl-1A ~ '400 506-414 ~ c ' 64 ' 1 Battery Charger BC-1-1B' :l ~ - 68 415- ' 506-414 1 ' Core Spray Pump Disch.-Viv.,V14-11A 413

69 - .-506-414'

, . . , , -Reactor Recirc Unit RRU-7 413- 506-414 u ?O - . EC 90 . 414~ ~ 72 -- 506-414'4 ' ' ' .01esel Generator IA' Aux 111eries - -413 506-4141 . % ;. . '74 1 'Sta. and Instr. Air Compressor.Cl-18:. e - , All 506-414 -c i 761 DG Room Exhaust Fan YEF-2 413 u ' e.c s : 7- 506-414- .~See Figure 3.1"; j r

r

4'_

g , , . ' F

L.- -

N $ ki ' s t - $s

e--. . ,

2" ' Table 4.7 - 33f 3 x Bus and Equipment Terminal Voltages - Case 3A - 6 i Conditions: : Maximum Load ._ Startup Transformers Carrying Auxiliary 1. cad - Allowable ~ > Node' . - . s Voltage Range (Volts) No.*< Oescription :Voltaoe (Volts)- (Sec. 2.2)

3. _.345 kV Switchyard 340,000 -

c 4 ;- '115 kV Snitchyard -110,000-8' :4.16 kV Bus.50 _ 3,668 9' ! 11 ' 4.16 kV Bus 1: E3,815 c12 ' :4.16 kV Bus'3 3,814 13'- '4.16 kV Bus 2- 3,662 -14 4.16 kV Bus 4 . 3,661 il7 Station Service Water PP P7-ID 3,812 4400-3600 18 - l Core Spray PP P46-1B 3,803 4400-3600 ~ 19 Residual Heat Removal Pump P10-lD 3,798 .4400-3600 20 - Residual Heat Removal Pump P10-1B 3,802 4400-3600 21 . Station Service Water PP P7-18. 3,812 4400-3600 25- Station Service. Water PP P7-1A? 3,659 4403-3600 . 27 - St6 tion Service Water PP P7-lC 3,66', 4400-3600 28 . Core Spray PP P46-1A' -3,655- 4400-3600 ~ .. 29 Residual Heat Removal Pump P10-1A 3,653 4400-3600 30' -Residual: Heat Remnval Pum.P10-1C~ 3,650 4400-3600 * .' 31 - 480 Volt Bus 8 437 , ^~ 32/ 483 Volt Bus 9 423 33 - Control Rod Drive Water PP -432 506-414 35 Reactor Building Water PP 429- 506-414 iU :37- MCC 8A 436 506-414 138:. MCC BB 434 506-414 ,39 MCC 8C 434 506-414 40 MCC 9A 422 506-414 - E - Al' . 'MCC 99 421 506-414

42 - MCC 9C 4?2~ 506-414 43 - . Standby Gas Treat. Exh. Fan REF-28 431 506-414 44- . Battery Charger BC-1-1A 435 506-414 48 . MCC 8E 433 '506-414-s ~ 52 - Core Spray PP 01scharge V1v. V14-11B 434 =506-414-53: Chiller Compressor SCH-1 , 431. 506-414

'55 Reactor Recirc Unit'RRU-B - 431 506-414: -Diesel Generator IB Auxiliaries 432 506-414 - 60 . ' DG Room Exhaust Fan TEF-3. ,. 432. 506-414

61. )Sta. and Instr. Air Compressor Cl-1A. '430- 506-414 64 Battery Charger BC-1-1B- . 422 506-414-

68. Core Spray. Pump Disch.:Viv.' V14-llA -

, -421 506-414 i69 . Reactor Recire Unit RRU-7.~ -417. 506-414-m

70 -

~

MCC 90

.. . .. . 421 506-414 72 2 Diesel Generator IA Auxiliaries.. . 417 506-414 , , 741 .Sta.'.and Instr. Air _ Compressor Cl-1B 415:. 506-414-- . , . ' l76. - DG Room Exhaust Fan TEF-2 y 417 506-414 ,.c- ~ + ~ ~ j L ee'.Figur_e S 3.1M i: m- , l . ,e. . ;; . , / y + g y- -: . . :t , n I $ ?;g. ' ,~' 3, . .4; .-3Q-' ' ^ ^ r.; -- "R l .4 _ .n 4 - '~ ' 5 g ,s ,, k e ~ - m,;c4 , x. , ._ j . J , a

7. %-

LW /.x - Table 4.8 ~ Bus snd Equipment Terminal Voltages - Case 'A-. 4 xi; -y p- . * - _s .- ~> ?." ~ Conditions:- Minimum Load . C'5 Startup Transformers Carrying Auxiliary Load' - c -r - Allowable - Node: ~ -Voltage Range (Volts). f No.* : :Descr1Dtioni _ Voltaae (Volts) (Sec. 2.2) - ~ {- 3 [ 1345 kV' Switchyard 362,000-M 14: :115 kV Switchyard 121,000 - - 8 :4.16 kV Bus'58' .4,346 s "11 4.16 W Bus 1: 4,349 , l12 .4.16 kV Bus 3: _4,348 . 13 - - 4.16 kV Bus 2 : -4,345' 14 1 4.'16 kV Bus 4' . . 4,344 5 ' 17 - Station Service Water PP P7-lO 4400-3600 . ;181 Core Spray PP P46-1B 19 . Residual Heat Removal Pump P10-lD! 20 . Residual Heat Removal Pump P10-1B' 4,337

. 77 -213 Station Service Water PP P7-1B

'2 25 -Station Service Water PP P7-1A 4,342 4400-3600 ~E . 27 Station Service Water PP P7-lC. 4,342. 28 . Core Spray PP P46-1A- . - 29 c Residual Heat Removal' Pump P10-1A - p 1 30 Residual Heat Removal Pump P10-1C L31 '480 Volt Bus 8 505 32 480 volt Bus 9 . 505 33 Control Rod Drive Water PP 35s . Reactor Building Water PP ' ~ l37' -505 ~ 506-414 ~ 1 MCC 8A - 1' 38 :. MCC 88 505 506-414 - 39 K C 8C- 505 506-414 40 MCC 9A: 505 506-414 41 ' KC 98 505' 506-414 E 42 .: MCC 9C. :505 506 ,3 43 Standby Gas Treat. Exh." Fan REF-2B -

44, . Battery Charger BC-1-1A, i48 - ' MCC 8E 505' 506-414 f 52 - Core Spray PP Disch.'. Valve V14-llB '

y 53 Chiller Compressor SCH.' l. Reactor Recire Unit RRU-8

u. . . .

-58L -Diesel Generator 18 Auxiliaries; ' 60 :- 'DG Room Exhaust Fan TEF-3 ' . . - ?611 LStat._and Instr. Air Compressor Cl-1A: 1 64 i Battery Charger BC-1-181.. . .. . . , w: : 68 : ~ Core Spray Pump Discharge Vly. V14-llA - 69 ? Reactor Recire Unit RRU-7-- 4 L , . . 3; ~ ~ ... - 70 ( ' .MCC 901 ,. ., . . , 1505'- 506-414 3; -- ':(,- , t 72 - ' Diesel Generator lA Auxiliaries. "g, 2 . 74' [Sta and: Instr. Air. Compressor Cl-1B -- r- <% 3 dy c hieselGenerstorRoomExhaustFanTEF .. - y.4 , ' - ._ ^: ~ .s ~ .* "See Figure 3.l'- (V y, > ^ c - - a'- . s s i k'_ .p q, 3 ' y ; g::?j[ , , qas ., . - . t :e - < c m?;. r- ^ + a , -i .~ , j.g 4:1' f5.0hVERIFICATION: _ s -.. .. . 9 .s / -

. Reference (a) required:-that the adequacy of the onsite and offsite J w , ,

" Lpower.fdistributidn systems / be verified by test to assure'that the analysis . L: -

resultslareLvalid. . In cliea of: actual; tests,:;the computer load flow, program .

- and model of the auxiliary; power system was used to predict' bus ~ voltages 3 -- . , n , .for actual' plant: conditions.: . Two. verifications were made.- The'.results Comparison of' bus of'theiverification studies are providedLin Table'5.1. voltages. predicted by~the computer program'to actual bus voltages demonstrat'es that-,the computer model is valid.. w A . h' .g.

l ;;

o w ^' S.- ,nY ) { m A 4 '~y;; 'v n 'l ,. t 4 'W* , _:l. . -~ w 1 s ' b , 7 e b % , p. 'l t I . * ~ . '? 4 - r <- J{ L g n w , u ,. 1 - 4 l ' "~ - -3 2 .. ^ c- .' - A m . . v7 , , 2 e' , . . 's , 1 1, a .,1- % qy I ,l . . , - . ? Table 5.1-

.g - _- .

Predicted Voltage Vs2 Measured Voltage s: . 3 Verification #1;.- December.8,-1979 - 0745 hours0.00862 days <br />0.207 hours <br />0.00123 weeks <br />2.834725e-4 months <br /> . Predicted Voltage Measured Voltage Percent Deviation Bus- .(Volts) (Volts) ~(Percent)

4160l volt ~bue 1 4170 4100 - .+1. 71 04160.~volti bus :21 4143' 4140 +0.7 54160 volt ! bus'3 4170- 4120 +1.21

~4160 volt < bus 4 4143- 4180- .89 ^ 1 4h0 volt bus 8 i ~ 461 458 +.66 1480 volt bus 9- 462 457 +1.09 .[ Verification #2~-; December.14,' 1979 - 1540 Hours Predicted Voltage. Measured Volgage .Perc.ent Deviation ' Bus' '(Volts)- (Volta) (Percent)_ o '4160 voltibus:1~ -4170 4080 +2.21

n.

, 4160 volt bus 2' 4144 4050' +2.32 4160' volt bus-3 4170. 4200 .71 ' 2.95 '.4160 volt bus /4 4144: 4270 - ~ 3 480. volt.b'us'8 1459.- 462 .65 48b;yoitbus.~9' , 454 .462. -1.73: i v-l$ ..O , l .Y L ';-

, A

.:-s. . Y

e 3 .

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'N, ,'

i. - ,

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w N

n :- .0:, , ~ y p , ' " n -; REFERENCES ~ x, - , . , ~ , - ., ........c,,_ .. . . . . . . m ~ i(a)-F Letter!from: United States 5 Nuclear Regulatory / Commission to All Power e + ~ ' ] Reactor Licensees, Adequacy of Station Electric Distribution ' System : 7 Voltages, :( Augus t . 8 y 1979). - - ' (' 2 - f ~ ~ ~ ~ i 2.. A(b)'0VYNPC' Letter to'USNRC, Licensee Event Report 80-l1/IP-(March:13, 1980). 1;;p - i e '4 .:- .,f," k- ,:w ,. 5 _m=*

l. 4 e

N; . . M iP f. e d' f'.. 's

4 w

e I e I b' [ eg_

n;s,

, N .[ ] ., , yT ,s.'r 1 m m + g -' , '- ' ( 4 ~~._.t . ,, ,i),, l' - 4 ' 3 I _ G .i 1W - ,;, 3 , g ,, ' em - > [' : $'

J l., -

y!._~ s

1 x r , ,

.2 5 .. # 3,;* . J ,

t Y

,, [

4.,,;_

k 1 9: w._. ' . - ^ *'.. ,- c - __. + ;'_., % i. 1 q - g e ,g',-- i '.34-.

9 ; yu ,

y - ~ , , , ,

f's , ' - *

^ ' .A $ $!l&; , - & N:*. + in s m .,w_e. . - -> _ _ _

ML19312D230

Text

4.0 CONCLUSION

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