ML19326C643

Responds to NRC .Discusses NRC Positions Re Onsite Emergency Power Sys.Proposed Plant Mods Being Reviewed & Completion Schedule Will Be Submitted,Provided Proposed Mods Are Accepted by NRC

ML19326C643
Person / Time
Site:	Arkansas Nuclear
Issue date:	08/23/1978
From:	David Williams ARKANSAS POWER & LIGHT CO.
To:	Reid R Office of Nuclear Reactor Regulation
References
1-088-15, 1-88-15, NUDOCS 8004240581
Download: ML19326C643 (31)

Text

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f 04 REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

DISTR BUTION FOR INCOMING MATERIAL 50-313 REC: REID R W ORG: WILLIAMS D H DOCDATE: 08/23/78 NRC AR PWR & LIGHT DATE RCVD: 08/31/7(

DOCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED

SUBJECT:

LTR 1 ENCL 40 RESPONSE TO NRC REQUEST OF 06/03/78... FORWARDING INFO CONCERNING ONSITE EMERGENCY PWR SYSTEMS AT SUDJECT FACILITY W/ATT RELATING INFO.

PLANT NAME: ARKANSAS - UNIT 1 REVIEWER INITI AL:

XJM DISTRIBUTOR INITIAL:pq o**************** DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS ******************

ONSITE EMERGENCY POWER SYSTEMS.

(DISTRIDUTION CODE A015)

FOR ACTION:

BR CHIEF ORB #4 BC**W/7 ENCL hh"'REOFILE**ure"~

INTERNAL:

NRC PDR**W/ ENCL tauaxw/2 ENCL OELD**W/ ENCL MIPC**W/ ENCL HANAUER**W/ ENCL AUXILIARY SYS DR**W/ ENCL I & C SYSTEMS BR**W/ ENCL AD FOR SYS & PROJ**W/ ENCL ENGINEERING BR**W/ ENCL REACTOR SAFETY BR**W/ ENCL PLANT SYSTEMS BR**W/ ENCL EED5*W/ ENCL POWER SYS BR**W/ ENCL T.

WAMBACH**W/ ENCL D.

TONDI**W/ ENCL D.

MCDONALD **W/ ENCL J.

HANNON**W/ ENCL J.

MCGOUGH**W/ ENCL EXTERNAL:

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RUSSELLVILLE. AR**W/ ENCL ACRS CAT B**W/16 ENCL I

poca quAuTY PAGES DISTRIBUTION:

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THE END

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H EL PI N G BUILO ARKANSA9 ARK ANS AS POWER & LIGHT COMPANY

.O. sox sei u,,t. aOCK. A AK ANSAS 72203. (SOU 371 -4000 August 23, 1978 1-088-15 Director of Nuclear Reactor Regulation ATTN:

Mr. R. W. Reid, Chief Operating Reactor Branch #2 U. S. Nuclear Regulatory Commission Washington, D. C.

20555

Subject:

Arkansas Nuclear One - Unit 1 Docket No. 50-313 License No. DPR-51 Onsite Emergency Power Systems (File:

1510)

Gen tl emen.

In response to Mr. D.

K.

Davis' letter of June 3, 1977, and subsequent telephone cor.versations and meetings with members of your staff concerning the requested content of our reply, the attached enclosure is provided regarding onsite emer-gency power systems at Arkansas Nuclear One - Unit 1 (ANO-1).

The enclosure responds to the three staff positions of your June 3, 1977 letter, and discusses proposed plant modifica-tions.

Appendices I thru IV of the enclosure are provided as supplemental information to the staff positions ano ex-plain the analysis assumptions and results.

The proposed plant modifications are currently in the early stages of engineering review.

Before expending considerable efforts which may be affected by your review, we propose to submit a schedule for completion of those mutually acceptable modifications and appropriate technical specifications upon notification that our proposed modifications are acceptable.

Very truly yours, da~/x. &

Daniel H. Williams

-<e Manager, Licensing

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ARKANSAS NUCLEAR ONE - UNIT _1 Job 11406-101 RESPONSES TO NRC POSITIONS _ON MILLSTONE SYNDROME 1.

Position 1:

Second Level of Under-or-Over Voltage Protiction with a Time Delay We. require that a second level of voltage protection for the onsite power system be provided and that this second level of voltage protection shall satisfy the following criteria:

a.

The selection of voltage and time set points chall be determined f rom an anlysis of the voltage require-ments of the safety-related loads at all onsite sys-tem distribution levels; b.

The voltage protection shall include coincidence logic to preclude spurious trips of the of f site power source; c.

The time delay selected shall be based on the fol-lowing conditions:

1.

The allowable time delay, including margin, shall not exceed the maximum time delay that is assumed in the FSAR accident analyses; 11.

The time delay shall minimize the ef fect of short duration disturbances from reducing the availability of the of fsite power source (s);

and iii.

The allowable time duration of a degraded voltage condition at all distribution system levels shall not result in failure of safety systems or components.

d.

The voltago monitors shall automatically initiate the disconnection of offsite power sources whenever the voltage set point and time delay limits have been exceeded; The voltage monitors shall be designed to satisfy e.

the requirements of IEEE Std. 279-1971, " Criteria for Protection Systems for Nuclear Generating Sta-tions"; and f.

The Technical Specifications shall include limiting conditions for operation, surveillance requirements,

trip set points with minimum and maximum limits, and allowable values for the second-level voltage protec-tion monitors.

'3 Position 1:

Response

a.

Two levels of voltage protection for the onsite power system will be provided as follows:

1.

Two inverse-time under-voltage relays on each 4160 safety bus with a nominal voltage setting of 78% (of motor base voltage) and time dial setting of 1.0.

l Upon loss of power, these under-voltage relays will in approx imately 1.0 seconds initiate load shedding and starting of the associated diesel generator.

Isolation of the safety related busses will bt delayed approx imately 2.0 seconds to allow a fast transf er to of f site power.

The safety re-I lated bus will be isolated only if the fast trans-fer is unsuccessful.

ii.

Two instantaneous under-voltage relays on each safety related 480V load center bus with a nominal setting of 92% of 460V.

Upon voltage degradation to 92% of 460V and after a delay of 8 seconds, the relay will isolate the associated safety related 4160V bus from offsite power, start and connect the associated diesel generator.

To prevent spurious actuation, this circuit is blocked when large motors are being started.

b.

The loss of power (78%) relays described in a(i) will be connected in parallel so either relay will isolate the associated safety bus from the of f-site source.

The degraded voltage (92%) relays described in a(ii) will be connected in series to provide the required coincidence logic, c.

As stated in a( i), the maximum time between total loss of power and power restoration f rom an of f site source i

is approx imately 3.0 seconds.

The diesel generator is independently started during this interval and will start sequencing ES loads in 15 seconds.

i.

The above intervals are within the limits assumed in the FSAR accident analysis.

ii.

The 92%.under-voltage relays are delayed 8.0 seconds as stated in 1(a)(ii) above.

This delay is ade-quate to prevent spurious operation of the relay when motors start on the safety-related 4160V or 480V busses.

An interlock will be added to prevent operation of the timer when large non safety-related motors are being started.

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iii Under the amdL4sont identified by the system analysis, the safety related equipment will function satisfactorily.

d.

The voltage monitors will automatically initiate the disconnecting of the off-site power sources whenever the voltage and time set points have been exceeded.

e.

The voltage monitors and the associated circuitry are designed as Class 1E circuits in accordance with IEEE 279-1971.

f.

The Technical Specification will address these require-ments.

2.

Position 2 interaction of Onsite Power Sources with Load Shed Feature We require that the current system design automatically prevent load shedding of the emergency busses once the onsite sources are supplying power to all sequenced loads on the emergency busses.

The design shall also include the capability of the load shedding feature to be automa-tically reinstated if the onsite source supply breakers i

are tripped.

The automatic bypass and reinstatement fea-tures shall be verified during the periodic testing iden-tified in Position 3.

Position 2:

Response

The design will be modified to prevent load shedding from the emergency busses when a safety-signal is present and the diesel generators are supplying power.

3.

Position 3:

Onsite Power Source Testing We require t..at the Technical Specifications include a test requirement to demonstrate the full functional operability and independence of the onsite power sources at least once per 18 months during shutdown.

The Techni-cal Specifications shall include a requirement for tests:

(1) simulating loss of offsite power in conjunction with a safety injection actuation signal; and (2) simulating interruption and subsequent reconnection of onsite power 1

sources to their respective busses.

Proper operation shall be determined by:

Verifying that on loss of offsite power the emergency a.

busses have been de-energized and that the loads have been shed from the emergency busses in accordance with i

design requirements.

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b.

Verifying that on loss of of fsite power the diesel gen-erators start from ambient condition on the autostart signal, the emergency busses are energized with per-

' manently connected loads, the autoconnected emergency loads are energized through the load sequencer, and the system operates for five minutes while the gener-ators are loaded with the emergency loads.

c.

Verifying that on interruption of the onsite sources the loads are shed from the emergency busses in accord-ance with design requirements and that subsequent load-ing of the onsite sources is through the load sequencer.

l Position 3:

Response

i The Technical Specifications will address a requirement for tests, at least once per 18 months during shutdown, a.

Simulating loss of off-site power in conjunction with an ESAS, and b.

Simulating interruption and subsequent reconnnection

,of onsite power sources to their respective busses.

Attachments:

Appendix

.I Offsite Power Systems II Bus Voltage Level Study Summary Sheets III Steady State Voltages at Safety Rel' ted a

Busses IV Summary of Modifications l

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APPENDIX I ARKANSAS NUCLEAR ONE - UNIT 1 JOB 911406-101 OFFSITE POWER SYSTEMS ITEM 1:

Based on the results of a grid system stability analysis, the following discussion provides the nominal, maximum, and minimum values of voltage and frequency of the offsite power source that assures satisfactory operability of all electrical equipment of the station during all modes of plant operation.

Discussion:

In May of 1977, studies were performed to analyze the Arkansas Power & Light Company Transmission System in the Russellville area for voltage fluctuations under abnormal operating condi-tions.

These studies were made using the 2500 bus version of the Philadelphia Electric Company Load Flow Program in conjunction with the Southwest Power Pool 1977 Base Case Load Flows.

For purposes of the study, the following conditions were assumed:

1.

1978 Summer Peak Load Levels 2.

Unit 1 and 2 at ANO off line and receiving all auxiliary power from the AP&L transmission system.

These conditions were used as the most adverse since no voltage problems would exist in the area if either unit at ANO were on line.

Contingencies were then run to investigate the effect of the loss of area transmission and generation facilities upon the ANO 161 kV bus voltage.

The most severe condition investigated was the outage of the 500/161/22 kV autotransformer at the ANO Switchyard and a coin-cidental, but not simultaneous, outage of the hydro unit at the Dardanelle Dam.

For this case the voltage level was 150 kV or 934 at the ANO Switchyard 161 kV bus.

However, this condition is unlikely since it requires the outage of three generating units and the 500/161 kV autotransformer at the summer system peak.

For normal operating conditions with both units at ANO on line and no transmission line outage, the voltage level at the 161 kV bus would be 167 kV or 103.5%.

The normal operating ranges and abnormal levels of the off site spurces are:

' System Max.

Min.

Normal Abnogyal 161 kV 169 kV 166 kV 167 kV 150 kV

! 500 kV 525 kV 510 kV 518 kV 510 kV N]'01262-OlL2

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APPENDIX I (Continued)

The safety-related busses will be isolated f rom the off-site power cource before the voltage on the safety busses degrades to an unacceptable level by means of the 921 undervoltage relays described later in ITEM 4.

Hence the abnormal voltage condition I

of 150 KV will have no adverse effect on the performance of safety-related equipment.

The 3 possible modes of plant operation are listed later in

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ITEM 2.

The results of a second computer study of the in-plant distri-bution system shows that for acceptable voltage operating limits on the ESP buses (operating voltages above 90% and motor starting voltages above 804), the off-site system voltages must be between 1.0 P.U. and 1.05 P.U.

Additionally, this study showed that a 2000 MVA 500 kV system and 610 MVA 161 kV systera are adequate to support proper voltage 1svels for safe shutdown.

System dispatch-era have therefore been instructed to notify AN0 operators if any of these voltage and/or MVA limits are approached so proper action can be taken, including the starting of the diesel genera: ors on the ESF-buses.

Arkansas Power & Light Company has implemented an automatic load shedding program.

Approximately 30% of the grid system load is under supervision of underfrequency relays.

The load is shed in successive 10% increments at 59.3 Hertz, 59.0 Hertz, and 58.7 Hertz.

To date no load has been intentionally shed by this scheme.

Due to the sparse distribution of load on the AP&L system, it is difficult to envision a situation in which the ANO Plant Site would be isolated with load exceeding generation if either Unit 1 or 2 were on line.

For the case that neither unit were on line, a strong EHV system interconnected with neighboring systems coup-led with a load shedding program would ensure a stable system except for catastrophic events. Therefore, there is no credible con-dition that would cause a need for the 92% undervoltage relays to function.

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APPENDIX I (Continued)

ITEM 2:

A comprehensive study has been performed on the design and instal-lation of the station electrical sysems to previde reasonable

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assurance that all equipment will function continuously at the j

maximum and minimum electrical characteristics during all modes of plant oporation identified in ITEM 1.

The review specifically j

includes the following:

A.

The nominal and the maximum / minimum voltage levels at the safety related buses corresponding to of fsite power system o

maximum / minimum voltage levels defined in ITEM 1.

B.

The capability of all safety related loads, control and instrumentation circuits to perform their sa.fety functions at the offsite power system voltage levela defined in ITEM 1.

C.

Specific design features incorporated in the plant electrical system, to assure that acceptable. voltage levels are main-tained at the safety related buces for all modes of plant opera tion.

For the purposes of analysis three modes of plant operation-were identified as follows:

Full house auxiliary load supplied by the unit auxiliary o

transformer (UAT) supplied by the main generator.

Case studies included were:

(i)

Voltages + at all busses during steady state load operation.

(ii)

Voltages + during starting and acceleration of a 9000 HP reactor coolant pump (6.9 kV),

3000 HP condensate pump (4.16 kV), and a 150 HP motor (480V).

• Throughout this report, including Attachments I and II, various busses and relay set points are expressed as percentages of the associated load voltage rating (e.g., motors, fans, valves, etc.),

i.e., as percentages of 6.6 KV, 4.0 KV and 460V.

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APPENDIX I (Con tin'aed )

.o Plant startup and shutdowr ".heough Startup Transformer #1 (STI).

Case studies included w' es (a)

ST1 supplied from the 500 kV system.

(1)

Voltages + at all busses from minimum to full house auxiliary load conditions.

(ii)

Voltages + during starting and acceleration of a 9000 HP reactor coolant pump (6.9 kV),

a 3000 HP condensate pump (4.16 kV), and a 150 HP motor (480V).

(iii)

Voltages + at all busses during f ast transfer with and without safety signal.

i (b)

ST1 supplied fro'm 161 kV system.

Case studies similar to 2 A(i), (ii) and (iii) above.

o Plant startup and shutdown through Startup Transformer #2 (ST2).

Case studies included were the same as in 2(a) and 2(b) above.

A comprehensive review, based on computer case studies covering the three modes of plant operation identified above was made to provide assurance that all safety-related equipment will function continuously at the maximum and minimum electrical characteris-tics of the grid.

The results of this computer study incicate that the generator operating voltage should be kept in tho range of 21.7 to 23,1 kV, and the system grid voltage (500 kV and 161 kV) should be kept in the range of 1.0 p.u. and 1.05 p.u.

Tap settings of the UAT, ST1, and ST2 were selected to assure that the maximum and minimum voltages at equipment terminals fall within the range of 90% to 110% of the equipment rating.

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APPENDIX I (Continued)

The capability of all safety-related loads, control and instru-mentation circuits to gerform their functions are as follows:

1 Percent of Voltage Rating Continuous Equipment Operation Starting Motors

• 90-110 80 MOV's N/A 80 4.16 kV Switchgear 90-115 N/A 480V Svitchgear 90-125 N/A 115V Contactors -- Size 1 90-110 80 Pickup 60 Dropout Size 2 90-110 80 60 Size 3 90-110 80 60 Size 4 90-110 80 60

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115V Relays -- Aux. Relay (HFA)90-110 80 40

-- Aux. Relay (HG A)90-110 80 55 120V Relays -- Timers ( AG ASTAT)90-110 80 50 The analysis of the computer studies and the investigation of required changes to the system design were sub-divided into power circuits and control circuits.

Power Circuits Case Studies that represent the system design prior to the Millstone Syndrome Studies, identified thats (1)

During simultaneous starting of all safety-related motors due to a fast transfer to off-site power source coincident with a safety signal, voltages at the safety-related 480V busses were below the minimum required.

(2)

During large motor starting, voltages at the 4160V ESF busses were marginal, and (3)

During slow transfer voltages were unacceptable.

• Safety-related motors were designed to provide full load torque during momentary dip to 75% of rated voltage when other motors accelerate on the system.

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APPENDIX I (Continued)

As a result, the following changes will be made to the system design:

(a)

The safety loads will be sequentially loaded to the off-site power source, the sequence being the same as applied to the diesel generator source.

Appendix II, cases 2 H through 2HS and 3 H through 3H10, shows the voltage condi-tions during the significant steps of the sequencing process.

The above changes will resolve problems (1) and (2) above.

To resolve problem (3), the slow transfer to of f-site power will be deleted.

Control Circuits The minimum acceptable voltage at the 480V busses was deter-mined to be 92% of 460V based on the equipment capability to operate continuously at 90% of 460V at the equipment terminals.

An investigation was performed to determine if the contactors will pick-up reliably at the pick-up values furnished by the manufacturer.

These are:

Size 1 80% of 115V (nominal rating)

Size 2 80%

Size 3 80%

Size 4 80%

Calculations were made to assure that control transformer imped-ance as well as control circuit lead lengths would provide the minimum pick-up voltages at the contactor terminals with 92%

voltage at the primary of the control transformer.

The results indicated that in certain instances, control transformer sizes will have to be increased and in others, auxiliary interposing relays will have to be added.

Discussion:

A.

The maximum and minimum values of voltage at the safety-related busses for corresponding off-site power system maximum and minimum voltage levels identified in ITEM 1 are shown fn Appendix IV.

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APPENDIX I (Continued)

B.

Under normal operating conditions, steady state voltage levels'are acceptable on all safety buses when the plant is connected to the UAT, ST1, or ST2.

During abnormal con-ditions, such as low grid voltage, or after a fast transfer from the UAT to ST1 or ST2, it has been calculated that the resulting 480V safety bus steady stato voltages could be below minimum acceptable levels. To cravent cperatirc with the safety busses at unacceptable levels, the above referenced ccq)reheruive review, based on comnuter enre studies, has resulted in the charces outlined in paragraph C be: low.

C.

During startup, administrative procedures will be used to switch over to the UAT before full house load is applied to ST2.

ST2 is adequate, however, to supply normal shutdown load of one unit (Unit 1 or Unit 2) and accident shutdown load of the other unit.

During a fast transfer to either ST1 or ST2, automatic load shedding will be initiated to assure safe starting and oper-ation of safety equipment.

Safety related busses will be automatically isolated when of f-site system voltage as measured at safety related busses falls below permissible levels.

j Safety related instrumentation circuits are supplied from inverters that assure regulated 120VAC output, even under degraded input ac voltage conditions.

Startup Transformers ST1 and ST2 and the Unit Auxiliary

'.'ransformer (UAT) are provided with of f-load tap-changers.

See Item 4 below for further details.

• TE1 4:

The following describes the specific design provisions included in the plant Class 1E power systems to assure continued operabil-ity of safety equipment in case the off-site power system charac-teristics exceed the limits identified in ITEM 1, and includes the following:

A.

The design basis and criteria for identifying the off-site power system degradation and isolation of the plant electri-cal power systems from the off-site power system.

B.

The design basis and criteria of systems used by the control room operator.to identify the condition of all safety-related busses and other safety-related equipment during an of f-site power system degradation.

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APPENDIX I (Continued) o C.

A list. identifying those monitors used by the control room operator in (B) above.

This should also specifically include meters, indicator types, alarm setpoints, and recorders.

Discussion:

To insure continued operability of safety equipment should the off-site power system characteristics exceed the limits identi-fled in the first item, due to abnormal conditions, the design features described below will be incorporated:

(A)(i)

Frequency Degradation:

If system frequency degradation occurs, automatic system load shedding under-frequency relays will shed loads in three 10% steps at 59.3 Hz, 59.0 Hz and 58.7 Hz.

The operating procedures will insure that the safety-related system is isolated from the off-site system and supplied by the diesel generator, by syn-chronizing the diesel units (one at a time) and trip-ping the incoming 4160V breaker to the safety-related busses, when the system frequency falls to 59.9 Hz.

(A)(ii)

Voltage Degradation:

One undervoltage inverse time relay has been provided on each 4160V safety bus.

Another will be added.

The i

contacts of these relsys will be connected in parallel and the relays will be set to actuate at 78% of 4000V.

The function of these relays is to isolate the safety busses in approximately 3.0 seconds, upon total loss of voltage at the 4160V safety busses.

Additional under-voltage relays will be provided at the 460 ESF busses to isolate the safety-related system at the 4160V level upon degraded off-site system voltage, with a setting of 92% of 460V and a time delay of 8 seconds.

A possibility of unwarranted isolation exists when a reactor coolant pump or condensate pump is started.

Under these conditions, the 480V safety bus voltage could dip to below 924 of 460V for longer than 8.0 sec-onds.

To prevent this, an interlock will be added to block the operation of the 92% relay while starting the above motors.

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APPENDIX I (Continued)

The diesel generators are started independently by a safety signal.

Hence the time taken by either of the above undervoltage relays will be less than the 15 sec-onds required by the diesel generator to assume the safety-related loads.

Due to the automatic prote: tion described above, oper-ator action,is not require,3 to isolate the safety busses upon degraded voltage conditions.

However, the alarms described in Item 4(C) below would enable the operator to manually isolate the safety busses if degradation is slow, thur, preventing a unit trip.

(D)

Various voltages and currents described under 4(C) below are indicated in the control room to enable the operator to monitor the condition of.the voltages of the 4160V safety busses, the 480V safety load center currents, and the' frequencies, voltages, and currents on the diesel generators.

In addition, currents on each 4160V motor are indicated on the switchgear and the voltages on the 480V load centers are indicated on the load center switchge'a'r.

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APPENDIX I (Continued)

(C)

The monitors used by the control room operator are as

'follows:

Meters (Control Room)

Equipment Monitor Type 4160V Safety Related Switchgear Voltmeter GC-AB40 4160/480V Safety Related Load Center Ammeter 4160V Diesel Generator Vol tme ter 4160V Diesel Generator Frequency 22 kV Main Generator Ammeter 22 kV Main Generator Voltmeter 22 kV Main Generator Frequency 22 kV Startup Transformer #1 Voltmeter 22 kV Startup Transformer il Ammeter 161 kV Startup Transformer #2 Voltmeter Meters (Local) 4160V Safety Related Motors Amme ter G E-AB4 0 480V S&fety Related Load Center Voltmeter Recorders (Control Room) 22 kV Main Generator Frequency Set Points Alarms High-Low 22 kV Main Generator Voltage 23.1 kV 21.7 kV 500 kV Bus il Voltage 525 kV 510 kV 500 kV Bus #2 Voltage 525 kV 510 kV 161 kV Bus Voltage 169 kV 165 kV I

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ITEM 5:

Provide a description of the testing program employed to verify the adequacy of the plant protective systems.

Discussion:

An on-going testing, calibration and operation program is con-ducted at Arkansas Nuclear One Unit 1.

The purpose of this program is to assure that the equipment and systems perform in accordance with design criteria.

The testing program procedures comprises (1) Objectives, (2) Ref-erences, (3) Test boundary limits, (4) Precautions, (5) Prerequi-sites, (6) Special test apparatus, (7) System test, (8) Data required, and (9) Acceptance criteria.

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This program may be nummarized as follows:

A.,The program begins as installation of individual components and systems are completed.

B.

Components and systems are tested in accordance with test 1

startup procedures.

C.

Test program verifies system and/or component operation under normal operating conditions.

D.

Test results are analyzed to verify the adequacy of the sys-tems and components.

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APPE!! DIX IV i

I ANRANSAS NUCLEAR ONE - UNIT 1 JOB #11406-101

SUMMARY

OF MTURICNE MODIFICATIO?E Circuit Changes 1.

Fast transfer to off-site source with a safety signal:

a) Shed selected non-ESF loads.

b) Sequence idle ESF loads.

c) Delay selected ESF 480V ESF loads.

d) Block load shedding feature on the 4160V safety busses when the diesel generators are supplying these busses, provided a safety signal is present.

2.

Off-site scurce available but fast-transfer fails:

a) Shed selected ncn-ESF and ESF loads.

b) Sequence ESF loads to r4'f-site source.

c) Delay selected ESF 480V ESF loach.

3 Delete slow transfer.

4.

Add 92% undervoltage relays on 480V ES busses B5 and B6.

Add coincidence logic to the 925 undervoltage trip circuit.

5.

Block the operation of the 92% UV relay during start of reactor coolant pumps or condensate pumps.

i Hardware Changes i

1.

Increase size of control transformers as required.

2.

Add anvilim7 interposing relays in starters as required.

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APPDDIX IV (CCITTINUED)

Admi.dstrative Procedures 1.

If system frequency falls to 59.9 Hz, manually isolate the safety busses.' (Synchronize the diesel generator and the off-site source breaker.)

2.. To prevent unwarranted plant trips, operator action should be initiated as follows:

(1). If 500 KV or 161 KV bus undervoltage alarm is received, or if the system operating conditions would approach a 500 KV or 161 KV system fault load of 2000 MVA, isolate the safety busses (one at a time), by synchronizing the diesel generator and tripping the incoming feeder breaker (152-A309/152-A409).

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ARKANSAS NUCLEAR ONE - UNIT 1 2

JCQ #11406-101 Summary of BUS Voltage Level Analysis CASE GROUP ll - UNIT AUXILIARY TFANSFORMER, t

BUS VOLTAGE IN P.U. OF MOTOR VOLTAGE BASE I

CASE E9KV 4.16KV 480V 780V 480V 480V NO.

DESCRIPTION LOADING

SUMMARY

BUS BUS NON-ES CP3 ES-B5 ES-B6 COMMENTS

j. Je

,'.-1A Minimum Ioad 2 Cold RCP's plus 60%

1.1387 1.1234 1.1272 At Unit Aux. Trans. Tap Vsys=1.05 P.U.

of Station Equivalent 0/975 P.U. of 21.5KV Trans. Tap at.975 4.16KV Aux. Inad.

Voltage is too hight P.U. of 21.5KV.

Motors would be over-excited.

V-1A1 Minimum load Same Loading as in 1.1095 1.0941 1.0977 Voltage Level is Accept-Vgys=1.05 P.U.

Case V-1A able with New Tap Settirg Trans. Tap at 1.00 P.U. of 21.iKV.

V-1B Maximum Ioad 4 Hot RCP's and Full 1.0159 1.0187 0.9587 Voltage is Acceptable.

Vgyg=1.00 P.U.

Statiers Operating Aux.

Trans. Tap at 1.00 Loads P.U. of 21.5KV.

I

-1B1 Maximum Load Same Loading as in 1.1007 1.0743 1.0184 voltage Level is Accept-Vgjg=1.05 P.U.

Case V-1B.

able.

l Trans. Tap at 1.00 P.U. of 21. 5KV.

e V-lc Start of Last RCP The Running Loads Are 0.9086 1.0728 1.0167 Momentary Voltage During l

Vgy3=1.00 P.U.

Operating Station Aux.

The Starting of 9000 IIP l

Trans. Tap at 1.00 Loads Motor is Acceptable.

P.U. of 21.5KV.

Less One (1) RCP. Start 1 Cold RCP.

1 4

G k

or.

~.., - - -. *, -

I O

,CAhE dROUP ll - UNIT AUXILIARY TRANSFORMER (Continued)

Pcg2 2 BUS VOLTAGE IN P.U. OF MOTOR VOLTAGE BASE CASE 6.9KV 4.16 KV 480V 400V 480V 480V NO.

DESCRIPTION LOADING

SUMMARY

BUS BUS NON-ES CRD ES-B5 ES-B6 COMMENTS V-lD Start of Last Cond.

The Running Loads Are 1.0646 0.9522

• 0.8870 Momentary Voltage Dip Is

, Pump. Vsys=1.00 P.U.

Full Operating Station Acceptable.

Trans. Tap at 1.00 Aux. Loads P.U. of 21.5KV.

Less One (1) Cond.

Pump.

Start 1 Cond. PP.

~ lD1 Start of Last Cond.

All Running & Starting 1.0654 0.9494 0.8839 Momentary Voltage Dip Is Acceptable.

Pump (Test Model)

Loads Are Same As In V ys=1.00 P.U.

Case V-lD Except That S

Trans. Tap at 1.00 All Load Centers Were P.U. of 21.5KV.

Calculated Separately.

V-lE Start of 150HP Motor The Running Loads Ares 1.0469 1.0150 0.8924 Momentary Voltage Dip Is On 480V. BUS Full Station Operating Acceptable.

Vsys=1.00 P.U.

Aux. Loads Less One (1)

Trans. Tap at 1.00 Typical 150HP Induction P.U. of 21.5KV.

Motor.

Starting Load Is One (1) Typ. 150HP Induction Motor.

t z'

1 1

0 4

9 S

I e

q

. CASE CROUP 82 - STARTUP TRANSFORMER 91 IC9' 3 BUS VOLTAGE IN P.U. OF MOTOR VOLTAGE BASE CASE 6.9KV 4.16KV 4SOV 480V 41IOV 4B 6V NO.

DESCRIPTION LOADING

SUMMARY

BUS BUS NON-ES CRD ES-B5 ES-B6 COMMENTS V-2A Minimum Load -

Minimum Load Necessary 1.1238 1.1111 el.lQ15 1.0877 Voltage Level on Station (Refueling)

During Refueling Aux. DUSES Is Acceptable V ys=1.05 P.U.

3 Trans. Tap at 1.00 P.U. of 21.5KV.

'2Al hinimum Ioad -

Minimum load When Unit 1.1233 1.1161 1.1199 1.0631 CRD Transformer Tapped

'i

'(Con tinuou s )

Is Shutdown (CRD Trans-At 1.025 P.U. : Voltage v ys=1.05 P.U.

former Energized Only; Acceptable.

s Trans. Tap At 1.00 Tapped at 1.025 P.U.)

P.U. o f 21. 5KV.

V-2A2 No Load This is a " Manual" 1.1232 1.1174 1.1211 1.0938 voltage Accettable.

v ys=1.05 P.U.

Calculation of Voltage s

Trans. Tap at 1.00 Levels on Station Aux.

i P.U. of 21.5KV.

BUSES at No-Ioad Con-ditions.

V-2B Maximum Load Maximum Station Oper-1.0295 0.9965 0.9370 0.9428 Voltage Acceptable.

(500KV System) ating Auxiliary Load V3ys=1.00 P.U.

Trans. Tap at 1.00 P.U. of 21.5KV.

i V-2B1 Maximum Load Same Loading As In 0.9895 0.9574 0.8923 0.9008 Station Aux. System Fed (161KV System)

Case V-2B).

From 161KV system Vsys=1.00 P.U.

Through 500/161KV Syst.

Trans. Tap at 1.00 Tie Auto-Transformer. At P.U. of 21.5KV.

Syst. Voltage Vsys=1.00 P.U. Voltages at Station Aux. BUSES Would De Un-Acceptable.

O.

O

o CASE bROUP 52 - STARTUP TRANSFORMER fl (Continued)

Pc92 4 BUS VOLTAGE IN P.U. OF MOTOR VOLTACE BASE CASE 6.9KV 4.16KV 400V 480V 480V 480V NO.

DESCRIPTION LOADING

SUMMARY

BUS BUS NON-ES CRD ES-B5 ES-B6 COMMENTS V-2B2 Maximum Load Same Loading As In Case 1.0486 1.0181' O.9583 0.9627 At Same Power Supply (161KV System)

V-28.

Arrangement As In Case Vsys=1.05 P.U.

V-2B1 With Syst. Volt-Trans. Tap At 1.00 age Vgys=1.05 P.U.

P.U. Of 21.5KV.

Voltage Level At Station Aux. BUSES Would Be Acceptable.

V-2B3 Test Load "A"-3RCP's Same Loading As In Case 1.0091 0.9614 0.8966 0.9049 At Same Power Supply (161 KV System)

V-2B Except Less One Arrangement As In Case l

Vsys=1.00 P.U.

(1) RCP.

V-2B1 And Syst. Voltage i

V 1.00 P.U.

Even With Trann. Tap At 1.00 3 kh=P's Running Voltages P.U. OF 21.5KV.

On Station Aux. BUSES l

Would Be Unacceptable.

V-2B4

' Test Load "B"-50%

Same Loading As In Case 0.9920 0.9765 0.9485 0.9202 At Same Power Supply Of LC Loading V-2B Except That Loadings Arrangement As In Case (161KV System)

On Sta. 480V. Aux. BUSES V-2B1 And Syst. Voltage 6

v ys=1.00 But Loading Vsys=1.00 P.U.

Are Reduced By 50%.

s Trans. Tap At 1.00 At 480 V. BUSES Reduced P.U. OF 21. 5 KV.

By 50% The Voltages on Sta. Aux. BUSES Are Still Unacceptable.

V-2C

. Start Of Last RCP The Running Loads Are:

0.8732 1.0271 0.9676 0.9717 At Power Supply From 500 (500 KV System) 3 Cold RCP's And Full KV System Voltage Dip On v ys=1.00 P.U.

Operating Loads On Station Aux. BUSES Is s

Trans. Tap At 1.00 Station 4.16KV And 480 Acceptable.

i P.U. Of 21.5KV.

V.

BUSES.

Starting Load Is 1 Cold RCP.

I t

I CASE GROUP 82 - FARTUP TRANSFORMER 41 (Continued)

BUS VOLTAGE IN P.U. OF MOTOR VOLTAGE BASE CASE 6.9KV 4.16KV 4BOV 480V 480V 480V NO.

DESCRIPTION IDADING

SUMMARY

BUS BUS NON-ES C P.D ES-D5 ES-B6 COMMENTS V-2C1 Start Of Last RCP Same Loading As In Case 0.7963 0.9332 0.8659 0.8761 At Power Supply From (161 KV System)

V-2C.

161 KV System voltage.

Vgyg=1.00 P.U.

Dip On Station Aux.

Trans. Tap At 1.00 BUSES Is Unacceptable.

P.U. Of 21.5 KV.

"l V-2D Start Of Last Cond.

The Running Load In:

1.0395 0.9240 0.8565 0.8668 Temporary voltage Dip Pump (500KV Jystem)

Full Load Of Station During Starting Is Vgys=1.00 P.U.

Aux. Syst. At Normal Acceptable.

Trans. Tap At 1.00 Operation Less One (1)

P.U. Of 21.5 KV.

Cond. Pump On 4.16KV BUS.

V-2D1 Start Of Last Cond.

Same Loeding As In Case 0.9814 0.8G93 0.7953 0.8104 Momentary volatage Dip Pump (161KV System)

V-2D.

During Starting Of 3rd V yg=1.00 P.U.

Condensate Pump Would Be j

3 Trans. Tap At 1.00 Acceptable, Ikr.ever, j

P.U. of 21.5 KV.

Continuous Operation g

with Power Supply From f

}.

161 KV Syst. Is Unac-ceptable (See Case i

I V-2BL).

f

.-2E Start of 150 HP The Running Load Ist 1.0301 0.9943 0.8720 0.9385 Momentary voltage Dip on Motor On 480V. BUS Pull 14ad Of Station Aux.

Station Aux. Syst. BUSES (500 KV. System)

Syst. At Normal Opera-Would Be Acceptable.

Vgys=1.00 P.U.

tion less One (1) 150 HP Trans. Tap At 1.00 Motor On 480 Volt. BUS.

4 P.U. Of 21.5 KV.

l

)

i 1

.1 i

ht I

'l 3

L d

'n CASE CROUP 82 - STARTUP TRN3SFORftER 81 (Continued)

PUS VOLTAGE IN P.U. OF HOTOR VOLTACE BASE CASE 6.9KV

4. l tiKV 460V 4HV 480V 460V NO.

DESCRIPTION LOADING

SUMMARY

BUS DUS NON-ES CRD ES-85 ES-B6 CCMMENTS

\\

V-2ff Start of 13 Inads at

'Ite Ibnnirg load is: (4) 1.0298 9A3 9350 9412 9159 9404 rim.tary Voltace Tim T=0 (>00W Syst.)

Heactor Coolant Ptrps at Dip en Staticn Aux.

Vayst.=1.00 P.U.

7510tF, Full Station Aux.

Buses is Acceptable Trunsf. 'Ibp at 1.00 Systaa at IJorml Operation P.U. of 21 5 KV whem ESP 480V.L.C. 's am toaded 679 7 KVA ard 607.75 b..

KVA #.62PF each. Arzt one CHD load. '1he Starting loads am: 6 Flisc.ibtors 'Ibtal 29 f

ifP 60 (Fby) Total d7.13 lip.

V-2111 Start of ES loads at All loads Described in V2ff 1.0328 0.9732 9099 9171

.8745 9168 Fkrentary Voltace l

Time T=> (500K'T Syst. )

are 11unning where ESF 480V Dip on Station Aux.

V System.=1.00 P.U.

L.C.'s art loaded 656 74 KVA M es is Acceptable.

Transf. 'Ibp at 1.00 ard 646.64 KVA at.82 PF each l

P.U. of 21.5KV.

and Startirs (1) Pri. Ihke up l

Puip 700 IIH (7) obtors 'Ibtal

[

84 5 I!P an1 (2) Valve d 26.4

,l d

iP.

q V-2112 Start, of ES loads at All loads Described in V2fil 1.0327 9742 9110 9181 9138 9202 Firentary Voltace Tim T=10 (500KV Syst.)

are Runnirs wtere ESF430V.L.C. 's Dip en Station Aux. ( Vsyst. = 1.00 P.U. are Ioaded 660.14 KVA and Buses is Acceptable. Trunf. Tap at 1.00 6co.74 KVA at.62 PF each j P.U. of 21 5KV. plus one prinary nokeup punp. l Startirs (2) Decay lleat Puers each 350 HP aral 4 motors total 3 i 26 ffP and 4 bby's 'Ibtal.7d ifP } l V-2113 Start of M loads at All loads Described in V2112 1.0320 9790 9161 9229 9231 93 % Firentary Voltace Tim 'l*20 (500KV Syst.) are finnire wtere ICF 480V Dip on Station Aux. Vsyst. =1.00 P.U. L.C. 's are loaded 573 53 INA Ibses is Acceptable. 'nnnsf. 'Ibp at 1.00 ani 694.13 KVA at.82PF each P.U. of 21.3 KV. plus two deca > beat purps. i Starting (2) R.B. Spray Ptanpo l q each 250!!P ard 6 lby's total 0 b.52 HP. s h .---...n...n.

CASE GROUP 8 2 - STARTUr TRANSFORMER 83. (Continued) FE93 7 BUS VOLTACE IN P.U. OF MOTOR VOLTAGE BASE ?.9xv 4.16KV 4tl0V 400v 480V 4T6v CASE NO. DESCRIPTION IDADING

SUMMARY

BUS BUS NON-ES CRD ES-85 ES-86 cmMENTS V21i4 SteMy State ES Loads All loads Dmribed in V?ll3 1.0300 9943 9232 .9382 9385 .9555 Voltage Accertable. at Time T=60 + (500t V wtere fry 480V L.C.'s am Syst.) Vsyst. = 1.00 P.U. loaded 910.75 KVA ard Wansf. Tap at 1.00 P.U. 663.19 KVA @.82 FP each of 21.5KV. plus tw> reacter B111 ding rpray purps are mmirg Except Mov Icad is Ibsoved Since Valves lhd Cormleted f' 'neir Travel. v-20 Slow Tmnsfer Tranfermd With Followirg 1.1107 0.7367 0.5330 0.6735 0.5792 0 5792 Voltage Drop On Station Aux. BUSES Is Far Below (500 KV System.) Ioads: Permissible Limits and Vsys=1.00 P.U. Two (2) Cond. Purps Unacceptable. Trans. Tap At 1.00 'Ibo (2) Serv. Water Purps P.U. of 21.5 KV. Four (4) Cire. Water Ptrps Five (5) L.C.'s with 0.5 MVA Ioad Each Two (2) L.C.'s with 0.5 K/A load Each CFD with 0.5 R/A. [ - - - - +.... - O

CASE CROUP 8 3 - STARTUP TRANSFORMER 82 Pcge 8 BUS VOLTAGE IN P.U. OF MOTOR VOLTACE BASE CASE 6.9KV 4.16KJ 480V 480V 480V 4I6V NO. DESCRIPTION LOADING

SUMMARY

BUS BUS NON-ES CFD ES-B5 ES-86 COMMENTS V-3A Minimum Load Estimated Minimum Load 1.1232 1.1110'l.1014 BUS Voltage At System

• (Pefueling)

When Unit Is In Shutdown Volt. Vsys=1.05 P.U. Is v ys=1.05 P.U. State Acceptable. s Trans. Tap At 1.00 P.U. Of 157 KV. l -3B Maximum Load 4 Hot RCP's Plus Maximum 0.9654 0.9286 0.8610 At Syst. Volt. v ys=1.00 s Vsys=1.00 P.U. Aux. Load When Unit Is P.U. Volt. Level At Sta-Trans. Tap At 1.00 Operating At Full Load tion 480V. Aux. BUSES is P.U. Of 157 KV. Unacceptable. V-3B1 Maximum Losd Same ".oading As In Cawe 1.0266 0.9918 3.9297 At Syst. Volt. Vsys=1.05 Vgy3=1.05 P.U. V03B PU Sta. Aux. Syst. Volt. Trans. Tap At 1.00 Would Be Acceptable. P.U. Of 157 KV. V-3C

• Start Last RCP.

The Running Loads Are: 0.7635 0.8456 0.7685 The Voltage Level On I Vgy3=1.00 P.U. 3 Cold RCP's And Full Station Aux. BUSES Is l Trans. Tap At 1.00 Operating Aux. Loads On Unacceptable. P.U. Of 157 KV. Station 4.16KV And 480V BUSES ( '-3 D Start Of Last Cond. The Running toads Are: 0.9373 0.8316 0.7525 Unacceptable. Pump. 4 HDT RCP's And Full V ys=1.00 P.U. Station Operating Aux. i 3 Trans. Tap At 1.00 Loading Less One (1) j .c P.U. Of 157 KV. Condensate Pump. Start 150 HP Motor Loading Similar As In 0.9638 0.9231 0.7999 Unacceptable. l V-3E On 480V. BUS Case V-3D Except Less Vgy3=1.00 P.U. One (1) 150 HP Typical j Trans. Tap At 1.00 Induction Motor On 480V j P.U. Of 157 KV. BUS. l i -~ ~ v,..-m

mue +2 - s a nwa u t. s aw.dr unrit.n ed u.on t a.nueo s e.ve z BUS VOLTACE IN P.U. OF MOTOR VOLTAGE BASE t . CASE 63 KV 4.16KV 480V 480V 480V 48CV NO. DESC31PTION IAADING

SUMMARY

BUS BUS NON-E3 CRD ES-C5 ES-D6 COMMENTS V-3H4 Steady State E3 totis 'ITe Pumirv; load is Pull .9628 .9208 .6525 .8575 .8784 Voltam te.el on at Tirw T=60 = (161KVsyst) Ctation Aux Systm at 430 Volt Ibses Trarcr. 73p at 1.00 P.U. florral 4 -mtion wtvre threeptable, or 157rt. 4&N ITE L.C.'s are loadei 910.75 r/A and 663.19 r/A at.82FF each and (1) Pri. Make up prp at t 700tT; (~' I (2) Decay tient Punos at 350te each; (2) Reactor Ebildirg Toray 4' Punps at 250HP each. v-3H5 start or E3 lasta at Tim.i Pull Ioad Station Aux. 1.0433 9619 .8976 .8632 .9051 Re m tarj t< w l Trarar. Tap rat. 1.00 P.U. ' System are Runnirg, stere on 480 Volt Euses is T=5 (161EV Oyrt.) EEF 480v L.C.'s are loadej acceptable. or 1$7KV.

756.74 r/A arx3 646.84 KVA at.82 PY each, less t

(4) R.C. Purps at 7510HP each; (2) Ioad Centers at 1 K/A each; (2) Cormiencate Ptrps at 3000HP each; (2) lleater Erain Punpa at 780HP each. 2' Etartirg as in Case V2H1. ' v-3175 start or ES toads at j 'Ibe runnire load is full station 1.0435 9531 .8991 9021 9146 Phrntarj Voltage h T=10 (161r/ Syst) f Aux. ' System at ?brml Operation wherY Dip on Station Aux. Trant. Tap at 1.00 P.U. EEF430VL.C.'s are loaded 860.14 r/A Buses is Acceptable, of 157KV. l and 680.64 r/A at.82PP each. Iecs g Irad as sixmn in V3H5 and includirg 4 ) one additiorn1 Prirnry rnke up puro. Startirg loads areas in V2H2. + I. I l l 5 l l j l l I s L_ ..,..n.. O

CASE GROUP 9 3 - STARTUP TPR'SFORMER 82 (Continued) PF97 10 d BUS VOLTAGE IN P.U. OF MOTOl VOLTAGE BASE CASE 'o.9KV 4.16KV 480V 480V 480V d5V r30. DESCRIPTION IDADItC

SUMMARY

BUS BUS NON-ES CRD ES-B5 ES-86 COMMENTS V-3rt7 St. art of 23 Iouds at All hnire loads lescribed 1.0%0 9093 9057 912e 9254 FLumtary voltage Tirm 920 (161KV Syst.) in Vjne wrem ESP ho0V.L.C.'s Dip on Statiott Aux. Transf. W p at 1.00 P.U. are loadel o73 53 KVA art! Luses is Acceptable of l>7KV. b94.13KVA at.d2PF each arti includirs (2) Decay heat Purps at 330 iip each; Startirt loads as shown in Vat 3 V-shd Steady State All mnnirn loads Described in 1.050) 9900 9281 9342 .9513 Voltage Acceptable ( T=oO + (ItlKVsyst) V31rl where EGF 4dOV.L.C. 's am Tmicf. np at 1.00 P.U. Ioaded 910.75 KVA ani 663.19 of 157 W. KVA at.62FF each aru! includirs (2) ficactor BuildirE Spray Ptanps at 250lfP each. f V-jl19 Start of r3 Imis at ftunnirg load is full station Aux.1.0032 9321 .ed74 .8536 .8952 Mxrntary voltage Time T=> (161 K1 syst.) Syst. wrere 4 DOL.C. 's are loaded Dip on ES lus B3 Transf. Tap at 1.^') P.U. 736.74KVA art! 646.d4WA at.d2PF is Unacceptable. 197W. eacri Irss (2) mactor coolant Ptsips l l (4) Circulatirg coolant parto (2) Feed water heater drain nurps arti startirg loads am I as snown in Vall. (" 3tt10 Start of c3 loads at All loads 1)escribed in 1.0071 90 % 9003 .6658 907d tbaentary Voltate a Time T=> (lolKV Syst.) V3if9 Less. (1) Coniensate Dip on Station Aux. Transf. Tap at 1.00 P.U. Ptscp at 3000ffP. Startirs tuses is Acceptable. of Id7KV. Ioad as in case Vall. sye

p , CADE G7tOUP 93 - STARTUP TRA!1SFORMER 82 (Continued) P193 11 BUS VOLTAGE IN P.U. OF MOTOR VOLTAGE BASE CASE 6.9KV 4.16KV 480V 480V 480V 480V NO. DESCRIPTION 10ADING SLR4 MARY BUS BUS NON-ES CRD ES-B5 ES-B6 COMMENTS V-30 Slow Transfer Transfermi With Fol-V3YS. =1.00 P.U. Iowirg Imis-' I Tram. Tap at 1.00 Two (2) Cond. Iirps pg[y P.U. of 157 KV. Tw) (2) Serv. Water D missible Limits Ani Four (4) Cirt. Water Purps Themfore Umecept-Five (5) L.C.'s 0.7 MVA Each able' T o (2) L.C.'s 0.5 MVA Each 0.9651 0.6621 0.4781 0.5206 0.5206 8 s., 2 i '+*-v=mm .~,.e W G

APPENDIX III ' ~... j ARKANSAS NUCLEAR ONE - UNIT 1 JOB 11406-101 9 STEADY STATE VOLTAGES AT SAFETY-RELATED BUSES L I BUS VOLTAGES IN P.U. OF MOTOR VOLTAGE BASE r INIM M HOUSE MAD MAXIM W HOUSE N POWER SOURCE VOLTAGE CASE 4.16kV 480V CASE 4.16kV 480V f NO. BWES A3 & A4 BWIS B5 & B6 NO. DWIS A3 & A4 DWIS 5 & B6 1.. UNIT AtlXILIARY TRANSFORMER A. Normal minimura

21. 5kV (0.977 P.U.)

tVA N/A 0.9935 0.9316 B. Nominal and normal

• 2 2. 0kV (1.000 P.U.)

N/A N/A V-1B 1.0187 0.9587 C. Normal maximum (2) 2 3.1kV (1.05 P.U.) V-1A1 1.0941 1.0977 V-1B1 1.0743 1.0184*

2. STARTUP TRANSFORMER NO. 1 A.

Nordinal 500kV (1.00 P.U.) N/A N/A V-2 D 0.9985 0.9370 D. Normal minimum (abnormal) ggy 510kV (1.02 P.U.) N/A N/A 1.0185 0.9557 l C. Normal operating

• 518kV (1.036 P.U.)

N/A N/A 1.0344 0.9707 D. Normal maximum (2) 525kV (1.05 P.U.) V-2A 1.1111 1.1015 1.0484 0.9839 l .r '. STARTUP TRANSFORMER NO. 2 l III A. Abnormal 150kV (0.93 P.U.) N/A N/A 0.8417 0.7665 B. Nominal 161kV (1.00 P.U.) N/A N/A V-3 B 0.9286 0.8610 C. Normal minimum 166kV (1.03 P.U.) N/A N/A 0.9681 0.9039 I D. Normal operating (2) 167kV(1.0 37 P.U. ) N/A N/A 0.9760 0.9125 i E. Normal maximum 169kV (1.05 P.U.) V-3A 1.1110 1.1014 V-3D1 0.9918 0.9297 j s t Indicates normal expected operating voltage levels Footnotes:

• N/A Not applicable (1) Protective relays are provided to protect system against abnormal conditions
• )

(2) The rnximum voltages shown are based on the minirnum loads as shown on Dwg. 11406-101-SKE-001, Page V-77 i l I L - - -. ~ _}}