Text

Voltage Study.
	ML18092B476
Person / Time
Site:	Salem
Issue date:	02/28/1987
From:	Hannett L; POWER TECHNOLOGIES, INC.
To:	;
Shared Package
ML18092B474	List: ML18092B473; ML18092B475; ML18092B476; ML18092B477; ML18092B478; ML18092B480; ML18092B481;
References
	R11-87, NUDOCS 8703310435
	Download: ML18092B476 (42)
	v • d • e

Salem Nuclear Plant Voltage Study PTI Report No. Rl 1-87 Prepared by:

Louis N. Hannett POWER TECHNOLOGIES, INC.

Schenectady, New York

--8703310435 870324

PDR ADOCK 05000272 S PDR

-~-~ -

February 1987

- Power Technologies, Inc.

Table of Contents

1.0 INTRODUCTION

2.0 VALIDATION OF SALEM PLANT MODEL 2 3.0 LOCA - PLANT SHUTDOWN STUDY 4 3.1 Load Flow Cases . . . . 4 3.1.1 LOCA on Unit 2 4 3.1.2 LOCA on Unit 1 5 3.2 Simulation Cases of Group Bus Transfers 5

Power Technologies. Inc.

1.0 INTRODUCTION

This report presents the load flow and simulation cases for the validation of the model for the Salem nuclear power plant owned by PSE&G. Field tests for the model validation were conducted by PSE&G and the comparison between simulation and test will be prepared by them.

This report also includes cases to evaluate the plant's voltage response to group bus transfers following a loss of coolant accident (LOCA). When a LOCA occurs on one unit a sequence is followed to start emergency pumps and to transfer the group buses of that unit to the station power transformer.

Added to that sequence is the shutdown of the second unit by the operators after the 4.16 kV voltages are restored by the LTCs after the first group bus transfer. The shutdown sequence includes bringing the unit to no load and switching off some of the pumps on the group buses. When the unit is tripped its group buses will be transferred to the station power transformer. These new cases show that the lowest steady state voltage on the vital buses after a group bus transfer is 92.9% .

/

Power Technologies, Inc.

2.0 VALIDATION OF SALEM PLANT MODEL 2

A field test was conducted on December 14, 1986, to validate the plant model used in this study. The simulation runs are presented in this Section for PSE&G to compare with the test recordings.

The plant load for the test is listed in Table 2.1. The 4.16 kV motor loads were set equal to their actual operating brake horsepower values. The loads on the 460 v and 230 v buses were adjusted to match the currents as measured on the 4.16 kV side of the step-down transformers immediately prior to the test.

The voltage range for the LTCs on the station power transformers was updated based on tests conducted on December 24, 1986. The actual range for each L TC was determined by stepping the voltage until the taps were changed.

The voltage ranges obtained from that test are listed in Table 2.2.

The control range of each L TC is approximately 0.016 pu. This range.

allows for two possible tap settings since tap increments are equal to 0.00625 pu. The actual tap in use at any instant depends upon the previous switchings of loads on the station power transformer. For example, during the plant startup switching on motor loads or increasing loads will lower the 4.16 kV voltage. The taps are raised if needed to bring the voltage above the minimum set point. Thus, the lower of the two possible settings is used in the computer model. On the other hand, after the group bus transfer to the auxiliary transformer, the 4.16 kV voltage on the station power transformers will rise above the control range. The L TCs will then begin stepping down until the voltage is again within the control range. In this case the higher of the two possible tap settings is used in the computer model. These examples are valid provided there is no large variation in the 500 kV grid voltage or a change in the loading of the main station power transformer due to changes in the other unit's auxiliary load. Since the plant loads were started on the station power transformer, the lower tap settings were selected for the load flows to model plant operating conditions prior to the test switchings ..

The first test had the Vital Bus 2B initially supplied from the station power transformer 21. The initial condition load flow for this case is shown in Figure 2.1 for Unit 1 and Figure 2.2 for Unit 2. The LTC tap settings and 4.16 kV voltages for the group buses and the low side' of the power transformers are listed in Table 2.3. The disturbance for this test was the transfer of Vital Bus 2B from station power transformer 21 to station power transformer 22. Unfortunately, the recording of the switching test was not successful and no simulation run was made for this test.

Power Technologies, Inc.

The second test was the transfer of the Vital Bus 2B from station power transformer 22 to station power transformer 21. The load flow results for the plant operating conditions before the transfer are shown in Figures 2.3 and 3

2.4. The group bus voltages from the simulation of the Vital Bus 2B transfer from SPT22 to SPT21 are shown in Figure 2.5. The 460 v and 230 v vital bus voltages are shown in Figures 2.6-2.8. The voltages on the vital buses are summarized in Table 2.5 .

- - Unit 1 Table 2.l. Plant Load For Model Validation Group IE and IH Buses Supplied From SPTI I Group 1E Bus Load l 3A Circulator 12 Reactor Cooling Pump l 2A Circulator IE Aux Sub - 141 amps IE P Aux Sub - 47.8 amps No. Rad. Waste - 8 amps Group H Bus Load 11 Condensate Pump 11 Heater Drain Pump 11 Reactor Cooling Pump 11 A Circulator IH Lightning - 34.7 amps I H Turbine 460 V - 72.2 amps IH Turbine 230 V - 34.7 amps Group IF and IG Buses Supplied From SPT12 Group Bus IF Load 13 Condensate Pump 12 Heater Drain Pump 13 Reactor Cooling Pump l IB Circulator 12 Turbine Air Compressor

l Circulator Water - 57.7 amps 1F Turbine 460 V - 11.l amps IF Turbine 230 V - 28.2 amps IF Lightning - 20.6 amps I G Group Bus Load 12 Heater Drain Pump l 3B Circulator 14 Reactor Cooling Pump l 2B Circulator 13 Turbine Air Compressor IG Aux- 62.4 amps IGP Aux- 60.7 amps

- Unit 1 Table 2.1. Plant Load For Model Validation (cont.)

Vital IA Supplied From SPT12 Vital IA Load

11 Component Cooling Pump 16 Service Water Pump Vital 460 V - 29.5 amps with no fans Vital 230 V - 15.6 amps Vital lB Supplied From SPT12 Vital 1B Loads 12 Component Cooling Pump Vital 460 V - 80.43 amps with both fans on line Vital 230 V - 22. 7 amps Vital IC Supplied From SPT 11

Vital 1C Loads 11 Service Water Pump Vital 460 V - 49.7 amps with one fan on line Vital 230 V - 13.6 amps Unit 2 - Generator was out of service 2E and 2H Group Bus Supplied From STP21 Group 2E Loads 22 Condensate Pump 21 Turbine Air Compressor 2E Aux 460 V - 43.2 amps 2EP Aux - 4.4 amps Group 2H Loads 21 A Circulator 2H Lighting - 24.3 amps 2H Switchyard - 5.2 amps 2H Turbine 460 V - 45.6 amps

2H Turbine 230 V - 13.5 amps

Table 2.1. Plant Load for Model Validation (cont.)

2F and 2G Group Buses Supplied From STP22 Group 2F Loads 23 Reactor Cooling Pump 2 Circulating Water - 57 amps 2F Turbine 460 V 33.7 amps 2F Turbine 230 V 30.l amps 2F Lighting 25.5 amps Group 2G Loads 2 Turbine Air Compressor 24 Reactor Cooling Pump 22 Circulator 2G Aux - 16.4 amps 2GP Aux - 62.3 amps Vital 2A Supplied From STP21 Vital 2A Load 21 Residual Heat Removal Pump Vital 2A 460 V - 47.5 amps with one fan

Vital 2A 230 V - 11.3 amps Vital 2B Supplied From STP22 Vital 2B Loads 22 Component Cooling Pump 23 Service Water Pump 22 Heater Removal Pump 24 Service Water Pump Vital 2B 460 V - 38.9 amps with one fan Vital 2B 230 V - 19.6 amps Vital 2C Supplied From STP 22 Vital 2C Loads 23 Component Cooling Pump 22 Charging Pump Vital 2C 460 V - 66.6 amps with one fan Vital 2C 230 V - 10.1 amps

Table 2.2. L TC Range Settings for Station Power Transformers Transformer Low Setting High Setting kV ID! kV Q.Y.

SPTll 4.305 1.0349 4.376 1.0519 SPT12 4.333 1.0416 4.399 1.0575 SPT21 4.320 1.0385 4.390 1.055 SPT22 4.346 1.0449 4.416 1.0615 Table 2.3. Initial Operating Conditions for Test 1 (Vital Bus 2B on SPT21)

Station Power SPT Group Bus Transformer Tap Position 4.16 kV Voltage Voltage Group Bus 11 4R 4.327 kV 4.319 kV lE&lH

12 21 22 6R N

4R 4.338 kV 4.318 kV 4.352 kV 4.329 kV

4.313 kV 4.345 kV

_ IF&IG 2E&2H 2F&2G Table 2.4. Initial Operating Conditions for Test 2 *

(Vital Bus 2B on SPT22)

Station Power SPT Group Bus Transformer Tap Position 4.16 kV Voltage Voltage Group Bus 11 4R 4.343 kV 4.334 kV lE&lH

. 12 7R 4.350 kV 4.342 kV lF&lG 21 IL 4.331 kV 4.327 kV 2E&2H 22 7R 4.394 kV 4.386 kV 2F&2G

Powe.chnologies, Inc.*

Table 2.5. Vital Bus Voltages From Computer Model INITIAL VOLTAGES TEST VOLTAGES TEST 1 TEST 2 TEST*2

TEST 2 MIN FINAL pu volts pu volts pu volts pu volts Vital lA 1. 04 04 4328 1. 04 3 2 4340 460v .l .*0784 1.0469 4355 496 1. 0813 497 1.0853 230v 1.0776 499 247.8 l:.0805 248.5 1.0844 249.4 Vital lB 1.0404 4328 1. 043 2 4340 460v 1.0640 l. 04 6 9 4355 489 l. 0671 491 230v 1.0739 l. 0710 493 247.0 l. 076 9 247.7 l. 0808 248.6 I

Vital lC 1.0379 4318 1. 0416 4333 l. 01 79 4234 l. 0383 4319 460v l. 06 93 492 l. 0731 494 l.0487 482 l. 0697 492 230v l. 0760 247.5 l.0798 248.4 1.0552 242.7 l. 0764 247.6 Vital 2A l.0363 4311 l. 04 00 4326 .9610 3998 1.0299 4284 460v 1.0691 492 l.0730 494 .9906 456 l. 0625 489 230v 1.0755 247.0 l. 0793 248.2 .9956 229.;0 1.0688 245.8 Vital 2B 1.0363 4311 1.0537 4383 .9610 3998 l. 02 99 4284 460v l.0706 492 1.0890 501 .9433 434 1.0636 489 230v 1.0713 246 l. 08 96 250.6 .9919 228.1 1.0649 244.9 Vital 2C 1.0443 4344 l. 053 7 4383 l.0652 4431 460V I 1. 0796 497 1.0895 501 230v l. 1014 507 1.0844 249.0 l. 0943 251. 7 1.10 62 254.4

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Power Technologies, Inc.

3.0 LOCA - PLANT SHUTDOWN STUDY Load flow and dynamic simulation cases for limiting operating condition 4

were prepared for a LOCA on one unit followed by a shutdown of the other unit. The bus voltages were first obtained from load flow to scan cases for acceptable steady state voltages after switching. Then simulation runs were made to obtain the transient voltage dip and more accurately determine the post group bus transfer steady state voltages.

The operating conditions for the plant prior to the LOCA include the following assumptions:

I. The SOO kV grid voltage is SOS kV.

2. The L TCs on the station power transformer were modeled to hold 4300 volts on their low side.

3. Six circulators in the plant are supplied from another source.

The initial condition load flows for the plant are shown in Figures 3.1 and 3.2 .

3.1 Load Flow Cases Load flow cases were prepared for each stage of the LOCA and the shutdown of the other unit to obtain an estimate of the steady state voltages.

3.1.1 LOCA on Unit 2 This set of load flow cases was prepared for a LOCA occurring on Unit

2. The station power transformer taps were held constant with the values as shown in Figures 3.1 and 3.2. With these taps a load flow case was prepared for the steady state conditions after the group bus transfer. The load flow for Unit 2 is shown in Figure 3.3. The voltages on the Vital Buses 2A and 2B are 93% and the voltage on Vital Bus 2C is 9S.2%. The load flow for Unit 1 is shown in Figure 3.4. The vital bus voltages of that unit are above 100%.

Load flow cases were then prepared for the shutdown of Unit 1.

Sufficient time was assumed to elapse since Unit 2's group bus transfer to

altow the L TCs to complete adjustments. The load flow for the operating conditions just prior to the shut down of Unit 1 is shown in Figures 3.S and 3.6. The LTCs on Unit 2 had reached their upper limits .

Power Technologies, Inc. 5 During the Unit I shutdown, the heater drain pumps and two of the condensate pumps will be taken off line. The third condensate pump will be running at a reduced load of 2700 horsepower. The load flow case after the Unit I group bus transfer* is shown in Figures 3.7 and 3.8. The lowest 4.16 kV voltage in the i>lant is 94.2% on the Vital Buses lB and IC.

3.1.2 LOCA on Unit 1 The second set of load flow cases were prepared for a LOCA on Unit 1 and the shutdown of Unit 2. The load flow for the steady state condition following the group bus transfer on Unit 1 is shown in Figures 3.9 and 3.10.

The lowest 4.16 kV voltage is 93.5% on Vital Buses lB and IC. The load flow for the operating condition prior to Unit 2 shutdown is shown in Figures 3.11 and 3.12. The load flow for the steady state conditions after the transfer of Unit 2's group buses is shown in Figures 3.13 and 3.14. The lowest 4.16 kV voltage is 94.3% on Vital Buses 2A and 2B.

3.2 Simulation Cases of Group Bus Transfers Simulation cases for the group bus transfers were run for the LOCA on one unit and the shutdown of the other unit. The 4.16 kV vital bus voltage

responses are summarized in Table 3.1. The values listed in this table include the initial voltage, the voltage dip, and the final voltage. The initial and final voltages for the 480 and 230 volt vital buses are shown in Table 3.2.

The first case is for a LOCA on Unit 2. The plots of the 4.16 kV voltages during Unit 2 group bus transfer are shown in Figures 3.15 and 3.16.

The plots of the Unit l group bus transfer for the shutdown are shown in Figures 3.17 and 3.18. The lowest steady state vital bus voltage from these two cases is 92.9% following transfer of Unit 2 group buses.

The second* case is for a LOCA on Unit I. The 4.16 kV voltages during Unit l group bus transfer are shown in Figures 3.19 and 3.20. The lowest steady state vital bus voltage from this transfer is 93.4%. The 4.16 kV voltages during the group bus transfer as part of the procedure to shutdown Unit l are shown in Figures 3.21 and 3.22 .

Power Technologies, Inc .

Table 3.1. 4.16 kV Vital Bus Voltage s from Simulation Runs of Group Bus Transfer LOCA LOCA on Shutdown on Shutdown Unit 2 Unit 1 Unit 1 Unit 2 Vital lA Initial 1.038 1.034 1.034 1.030 Dip .977 .923 .881 .991 Final 1.004 .964 .951 .994 Vital lB Initial 1.034 1.038 1.029 1.023 Dip .976 .882 .872 .972 Final .996 .937 .934 .976

Vital lC Vital 2A Initial Dip Final 1.034.

.976

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.882

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.872

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.972

.976 Initial . 1.025 L017 1.035 1.038 Dip .875 .965 .975 .887 Final .929 .970 .996 .938 Vital 2B Initial 1.025 1.017 1.035 1.038 Dip .875 .965 .975 .887 Final .929 .970 .996 .938 Vital 2C Initial 1.031 1.033 1.032 1.034 Dip .874 .995 .972 .921 Final .948 .998 .998 .962

Values are in per unit

Power Technologies, Inc.

Table 3.2. 480 V and 230 V Vital Bus Voltages from Simulation Runs of Group Bus Transfer LOCA LOCA on Shutdown on Shutdown Unit 2 Unit I Unit I Unit 2 Vital IA 480 Initial 1.066 1.061 1.059 1.055 Final 1.031 .988 .973 1.018 230 Initial 1.066 1.061 1.061 1.057 Final 1.031 .989 .976 1.020 Vital lB 480 Initial 1.059 1.063 1.041 1.036 Final 1.019 .958 .941 .986 230 Initial 1.062 1.065 1.056 1.050 Final 1.022 .962 .958 1.001 Vital IC 480 Initial 1.055 1.059 1.043 1.037 Final 1.014 .958 .942 .987 230 Initial 1.062 1.065 1.056 1.050 Final 1.022 .962 .958 1.001 Vital 2A 480 Initial 1.050 1.042 1.063 1.067 Final .949 .992 1.023 .962 230 Initial 1.052 1.043 1.062 1.066 Final .953 .994 1.022 .963 Vital 2B 480 Initial 1.037 1.029 1.063 1.067 Final .936 .979 1.023 .962 Initial 1.052 1.043 1.062 1.066 Final .953 .994 1.022 .963 Vital 2C 480 Initial 1.058 1.061 1.062 1.064 Final .971 1.024 1.026 .989 230 Initial 1.058 1.060 1.059 1.061 Final .973 1.024 1.024 .987

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1.0 INTRODUCTION

1.0 INTRODUCTION

==

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