ML20054L611
| ML20054L611 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 07/01/1982 |
| From: | VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | |
| Shared Package | |
| ML20054L609 | List: |
| References | |
| 1-OP-26.8, NUDOCS 8207080295 | |
| Download: ML20054L611 (12) | |
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ATTACHMENT I
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VIRGINIA ELECTRIC AND POWER COMPANY l-0P-26.8 NORTH ANNA POWER STATION Page 1 of 9 UNITS 1&2 500 KV SWITCHYARD VOLTAGE
References:
- 1. North Anna Units 1 & 2 GDC 17 Analysis, Letter dated 2-26-82 S. N.
076 to H. R. Denton from R. H. Leasburg
- 2. Generator Capability Curves (1-SC-4.3, 2-SC-4.3)
- 3. Unit 1 Control Room Operators Surveillance Log (1-LOG-4), pages 26, 27
- 4. Unit 2 Control Room Operators Surveillance Log (2-LOG-4), pages 27, 28
- 5. North Anna 500 KV Bus Voltage Schedule
- 6. OP-15.2, Main Generator Operation
- 8. FE 21A, 21F 1.0 Purpose This procedure provides recommendations for corrective action to be teken in the event the 500 KV Bus Voltage schedule cannot be met. By adhering as closely as possible to the scheduled voltage, the basis for the GDC-17 analysis (505 KV-535 KV) will not be violated. By maintain-ing the voltage above 505 KV following a one or two unit trip, it has been demonstrated by analysis that the voltage on the station buses will be such to ensure the starting of all safety related equipment required under worst case conditions without transferring loads to the emergency diesels. By maintaining the voltage below 535 KV, it has been demon-strated by analysis that the voltage on the station buses will typically be such as not to exceed equipment ratings and hence not result in reduced equipment life. Overvoltage alarms will be used to alert the control room operator of overvoltage conditions requiring corrective action to ensure that equipment will not be operated for extended periods at high voltages.
2.0 Initial Conditions 2.1 The main generator (s) are in service as per OP-15.2 and OP-43.0.
2.2 The generator voltage regulator is operating in automatic. If the regulator is operating in manual, extra operator, attention may be required to maintain voltage schedule.
2.3 The control room operators are monitoring 500 KV Bus voltage in accordance with Attachment II. If the voltage is exhibiting instability or other evolutions are in progress which require the attention of the control room operator (s), enter computer alarm l points at plus and minus 2 KV of the scheduled voltage. These alarm points will have to be updated each hour that the voltage schedule changes until the operators can resume their normal l surveillance. 8207080295 820701 PDR ADOCK 05000338 P PDR
, ', 1-0P-26.8 Page 2 of 9 2.4 The actual 500 KV Bus voltage deviates by more than 2 KV from the scheduled voltage as noted on the Control Rm Operator's LOG-4.
3.0 Precautions and Limitations 3.1 Maintain H Pressure2 between 60 PSIG and 75 PSIG. Be prepared to increase generator pressure in order to attain full MVAR capability.
This is especially ' important when operating the generator in the overexcited mode since at 60 PSIG, MVARs out are limited to 340 MVAR. Gas pressure must be increased to 75 PSIG before increasing MVARs out to ultimate limit of 500 MVAR.
NOTE: MVAR limitations specified in this procedure are for operation at 100% power. At lower power levels, the limits are higher (Reference Attachment I).
3.2 Monitor the generator core monitor closely during periods when the generator is being operated at high MVA loadings.
3.3 Limit generator amps to 28,568 as per generator technical manual.
3.4 The loading limit for the Unit 1 Station Service Buses is 3000 Amperes at all times. The loading limit for the Unit 2 Station Service Buses 2A and 2C is 3000 Amperes at all times. For Bus 2B, the limitation is 2500 Amperes whenever Emergency Bus 1J is tied to Bus 2B. Otherwise, the limitation on 2B is 3000 Amperes.
3.5 If Emergency Bus 1J is crosstied to Station Service Bus 2B, Unit 2 generator output voltage shall be maintained between 21.7 KV and 23.1 KV. If Bus 1J is not crosstied, Unit 2 generator voltage shall be maintained between 20.9 KV and 23.1 KV. If Emergency Bus 1H is crosstied to Station Service Bus 1B, there are no additional restrictions on Unit 1 generator voltage other than 20.9 KV to 23.1 KV (machine rating).
3.6 The unit 1 and Unit 2 Station Service Buses shall be operated between 4.0 KV and 4.4 KV. The 4.0 KV limit is based on limiting the stator temperature of the High Pressure Heater Drain Pump motors and most likely will be the limiting factor when operating l a unit in the underexcited (MVARs in) mode.
3.7 When operating the generator at a leading power factor (i.e. taking MVARs in), the MVAR limit shall be governed by the " Safe Operating Limit" on the generator capability curve unless directed otherwise by the System Operator. The Safe Operating Limit is a conservative limit for underexcited operation. Below this limit, there is the MEL (minimum excitation limiter) characteristig and the KLF (loss of field relay) characteristic. The MEL is a protective feature internal to the voltage regulator which will limit exciter field current to a predetermined level only when the regulator is operated in automatic. If the regulator is operated in manual (Base Adjuster control), the MEL unit is not functional, and operation below the Safe Operating Limit could result in a KLF operation and unit trip without prior alarm. The control room operator has no means to know from the control room that the MEL unit has operated other than the fact that the regulator is not
r 1-OP-26.8 Page 3 of 9 responding to demand for lowering voltage. Operation of the MEL unit can be verified locally at the regulator panel. The KLF relay protects the unit against a loss of stability by tripping the exciter field breaker and the generator output breaker (s). The curves for MEL and KLF plotted on Attachment I are for a generator voltage of 22 KV. As the voltage varies from 22 KV, the curves shift upward for voltages less than 22 KV and downward for voltages greater than 22 KV.
3.8 When operating the generator at a lagging power factor (i.e.
putting MVARs out), the MVAR limit shall be governed by the generator capability curve. It will be necessary to increase generator hydrogen pressure to 75 PSIG in order to reach the limit of 500 MVARs out.
3.9 Although not shown on the generator capability curves, the regulator has internal to it certain alarm and protective circuits which protect the generator when operating in the overexcited mode.
These circuits do not perform their functions until the generator is operating outside the 75 PSIG capability curve, and therefore, their characteristics are not overlayed on Attachment I. These circuits operate as follows:
3.9.1. Forcing alam picks up via K4 relay. Forcing alarm senses the DC current from the regulator power amplifiers to the exciter through an isolation transducer. This is only an alarm (Ann. window K-26, " Exciter Field Forcing") and has no tripping function.
3.9.2 The OXP-2 circuit senses the same signal as the forcing alarm. It operates in the following manner:
3.9.2.1 K1 picks up on an initial overexcitation and starts an inverse time delay dependent on the level of overexcitation. K1 also runs the base adjuster to a predetermined position by use of can switches.
Note: While K1 is timing, the regulator is still in auto control and voltage adjustments may be attempted by using Voltage Adjuster control switch.
Since the base adjuster unit is automatically running to a preset position which upon reaching this position illuminates the white light above the Base Adjuster control switch, do not adjust the Base Adjuster control switch during this time.
3.9.2.2 Af ter time delay for K1 has timed out, K2 picks up and trips the regulator from auto to base control and alar =s Ann, window K-19 " Voltage Regulator Auto Trip".
3.9.2.3 After a fixed time delay in base control (approx. 3 sec.) if the overexcitation condition still exists, K3 picks up and trips the exciter field breaker (Mach. Trip).
1-OP-26.8 Page 4 of 9 3.9.2.4 If the unit did not trip, place the auto voltage regulator to 0FF and adjust voltage with the Base Adjuster. Notify the System Operator that the voltage on the machine is being controlled manually.
3.10 The loss of regulator sensing voltage supplied by the voltage regulator potential transformers (possibly caused by a blown fuse) will automatically trip the regulator from auto to base control accompanied by the 21 arming of Ann. Window K-10 " Exciter Pot.
Trans. Blown Fuse" and Ann. window K-19, " Voltage Regulator Auto Trip".
3.11 The lights above the Base Adjuster control switch provide the following information:
Green light - Base Adjuster output is at lower limit.
Red light - Base Adjuster output is at upper limit.
Amber light - Base Adjuster output is at no load pre-position level.
Any time the exciter field breaker is opened or the breaker is racked to the Disconnect or Test position, the Base Adjuster is run back to this predetermined position.
White light - Base Adjuster output is at full load pre-position level. When the Kl relay in the overexcitation protection circuit is energized, the Base Adjuster is run back to this predetermined position.
3.12 The lights above the Voltage Regulator control switch provide the following information:
Green light - Regulator output is at lower limit Red light - Regulator output is at upper limit Amber light - Regulator output at intermediate level as determined by adjustable cam switch setting.
3.13 The modes of operation of the voltage regulator are as follows:
3.13.1 0FF (Green light illuminated) - The only control of machine voltage is by the Base Adjuster control switch. There is no feedback of actual voltage via the regulator to the Trinistat Firing Circuit and the MEL unit is not operational. Before closing into the system, variations in turbine speed will change generator voltage.
3.13.2 TEST (Amber light illuminated) - The Base Adjuster control switch is the only means to control generator voltage. The output of the regulator logic drawer is not connected to the Trinistat Firing Circuit. The Voltage Adjuster control switch can be used to balance the regulator output meter since its operation will not change generator voltage.
3.13.3 ON (Red light illuminated) - The Voltage Adjuster control switch is used to adjust the desired setpoint for generator voltage. The feedback intelligence circuit will compare actual voltage with desired voltage and generate the
, l-0P-26.8 Page 5 of 9 appropriate buck or boost signal to the Trinistat Firing l Circuit to vary exciter field current. The Base Adjuster ,
control switch can be used to balance the regulator output I meter since its operation will not change generator voltage.
3.14 The voltage regulator " balance volts" should be maintained at 0 using the appropriate control switch. When operating with the voltage regulator control switch in "0N", balancing should be done by using the Base Adjuster control switch. With the voltage regulator switch in "0FF" , the switch must be placed in " TEST" before balancing using the Voltage Adjuster control switch. These operations will not cause generator voltage to change. They ensure that the voltage regulator output signal will not be overranged and will permit full regulator action under transient conditions.
3.15 Reference OP-15.2 for temperature limits for the generator and exciter.
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I' '. 1-OP-26.8 Page 6 of 9 Initials 4.0 Procedure 4.1 Corrective actions to be taken in the event 500 KV voltage is saggieg below scheduled voltage (Attachment II).
4.1.1 Initial conditions are noted and satisfied.
4.1.2 Precautions and Limitations are noted.
4.1.3 Verify generator core monitor is energized.
NOTE: The following steps assume the regulator is in automatic. If the regulator is operating in manual, the Base Adjuster control switch must be used to raise generator voltage.
4.1.4 Use Voltage Adjuster control switch in the raise direction to attempt to increase 500 KV voltage to schedule value. This will tend to increase the outward flow of VARS from the generator.
CAUTION: Reference Attachment I and Precaution and Limitation 3.1.
4.1.5 If the 500 KV Bus voltage falls more than 4 KV below scheduled, start taking hourly readings of the 500 KV Bus voltage and record data on Attachment III.
Continue to adjust the Voltage Adjuster control
! switch in the raise direction as required in an attempt to meet the scheduled voltage.
4.1.6 If the 500 KV Bus voltage falls to 518 KV, verify that the 34.5 KV reactor banks are out of service.
If they are in service, notify the System Operator before removing them from service.
4.1.7 Review Precautions and Limitations 3.5, 3.6, 3.8, and 3.9. At any time these limitations prevent increasing MVAR output of generator, notify the System Operator and document the reason on Attachment l III.
4.1.8 If 500 KV Bus voltage falls to 515 KV. increase generator hydrogen pressure to 75 PSIG if not already done. .
4.1.9 If the 500 KV Bus voltage falls to 512 KV, make sure the generator is being operated at the limit of 500 MVARs out unless other restrictions prohibit such operation.
NOTE: At 510 KV on the North Anna 500 KV Bus, the System Operator will receive a computer data acquisition
- l-OP-26.8 Page 7 of 9 alarm. He will refer to Page 11.01(2) of the System Operators' Procedures Manual and initiate system level actions as specified in his procedure.
4.1.10 If voltage continues to drop below 512 KV and all actions above have been taken, immediately notify the System Operator.
4.1.11 Continue to log the information as started in Step 4.1.5 on Attachment III on an hourly basis until the 500 KV Bus voltage returns to scheduled voltage 22 KV.
I l
Ccepleted By:
I Date:
- 1-OP-26.8 Page 8 of 9 Initials 4.2 Corrective actions to be taken in the event 500 KV voltage is rising above scheduled voltage (Attachment II).
4.2.1 Initial conditions are noted and satisfied.
i 4.2.2 Precautions and Limitations are noted.
4.2.3 Verify generator core monitor is energized.
NOTE: The following steps assume the regulator is in automatic. If the regulator is operating in manual, the Base Adjuster control switch must be used to lower generator voltage.
4.2.4 Use Voltage Adjuster control switch in the lower direction to attempt to decrease 500 KV voltage to scheduled value. This will tend to increase the inward flow of MVARs from the system.
CAUTION: Reference Attachment I. Operation of the regulator in Base Adjuster control beyond the Safe Operating Limit requires prior System Operator approval (See Step 4.2.10).
4.2.5 If the 500 KV Bus voltage increases to more than 4 KV above scheduled, start taking hourly readings of 500 KV Bus voltage and record data on Attachment III.
Continue to adjust the Voltage Adjuster control switch i. the lwer direction as required in an attempt to meet the scheduled voltage.
4.2.6 If the 500 KV Bus voltage increases to 520 KV, verify that the 34.5 KV reactor banks are in service. If they are out of service, notify the System Operator before placing them in service.
4.2.7 Review Precautions and Limitations 3.5, 3.6, and 3.7. At any time these limitations (especially the 4 KV limit on Station Service Buses) prevent increasing MVAR intake of the generator, notify the System Operator and document the reason on Attachment III.
See Step 4.2.13 for further action.
4.2.8 If the 500 KV Bus voltage increases to 525 KV, increase generator hydrogen pressure up to 75 PSIG (Max.) as required. Note that higher pressures will not be required unless the generator is to be operated beyond the Safe Operating Limit (Reference
! Attachment I) or generator te=peratures dictate the higher pressure.
4.2.9 If the 500 KV Bus voltage increases to 528 KV, make sure the generator is being operated at the Safe Operating Limit of 220 MVARs in provided the regulator is operating in automatic, i
- 1-OP-26.8 Page 9 of 9 If generator output voltage drops sufficiently, the MEL unit may operate before reaching 220 MVAR in as explained in Precaution and Limitation 3.7.
NOTE: At 530 KV on the North Anna 500 KV Bus, the System Operator will receive a computer data acquisition alarm. At this point, he will refer to Page 11.01(5) of the System Operators' Procedures Manual and initiate system level actions as specified in his procedure.
4.2.10 If the 500 KV Bus voltage increases above 528 KV, notify the notify the System Operator that the generator is operating at the Safe Operating Limit of 220 MVARs in or is limited by the MEL unit as the case may be. If the regulator is operating in automatic and the MEL has not already limited MVARs in, the station will be authorized to operate beyond the Safe Operating Limit with concurrence of the Shift Supervisor. If the regulator is operating in manual (ie. Base Adjuster control), the System Operator will be responsible for authorizing operation beyond the Safe Operating Limit. Note authorized higher limit: .
CAUTION: If regulator is being operated in manual, the MEL unit is not functional (Reference Precaution and Limitation 3.7).
4.2.11 When operating beyond the Safe Operating limit, increase the MVAR loading in 5 MVAR increments being careful to zero the " Regulator Balance Volts" meter af ter each increase using the Baso Adjuster control switch. Use Voltage Adjuster if in manual regulator operation . If during this process of increasing the MVARs in, the MEL unit operates, the regulator will not respond to a demand signal for lowering voltage, and the generator will not take in any additicnal MVARs. Confirm that the MEL unit has operated by checking at the local regulator panel.
l 4.2.12 Notify the System Operator that the MVAR loading on the generator is limited by the regulator MEL unit.
Record the MVAR limit on Attachment III.
4.2.13 Continue logging the information as started in Step
, 4.2.5 on Attachment III on an hourly basis until the l 500 KV Bus voltage returns to scheduled voltage 22 KV.
Completed By:
Date:
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. 1-OP-26.8
- ' ATTACHMENT II VIRGINIA ELECTRIC AND POWER CGiPANY VOLTAGE SCHEDULE STATION North Anna VOLTAGE 500 kV Monday - Friday Saturday - Sunday - Holiday Time Schedule On/Off Scheduled On/Off Time Voltage (KV) Peak Voltage (KV) Peak 1:00 A 515 off 515 off 1:0,0 A 2:00 A 515 off 515 off 2:00 A 3:00 A 515 off 515 off 3:00 A 4:00 A 515 off 515 off 4:00 A 5:00 A 515 off 515 off 5:00 A 6:00 A 515 off 515 nff 6:00 A 7:00 A 520 on s1s nf< 7:00 A 8:00 A 524 on 515 off 8:00 A 9:00 A 524 on 515 off 9:00 A 10:00 A 524 on 515 off 10:00 A 11:00 A 524 on 515 off 11:00 A 12:00 N 524 on 515 off 12:00 N 1:00 P 524 on 515 off 1:00 P 2:00 P 524 on 515 off 2:00 P 524 on 515 off 3:00 P 3:00 P 4:00 P 524 on 515 off 4:00 P 5:00 P 524 on 515 off 5:00 P
! 6:00 P 524 on 515 off 6:00 P l 7:00 P 524 on 515 off 7:00 P on 515 off 8:00 P 8:00 P 524 9:00 P 524 on 515 off 9:00 P 10:00 P 520 on 515 nff 10:00 P 11:00 P 515 off 515 off 11:00 P 12:00 M 515 off 515 off 12:00 M Authorized by' h Manager-Power Supply Dept.
Date Effectivel S/2//d2- Supersedes Schedule Dated 9-1-77 Notes: 1) All voltage changes should be made in the 10 cnnute period prior to the hour.
- 2) Only the following days will be considered as holidays:
New Years Day, Memorial Day, Fourth of July, Labor Day, Thanksgiving Day, Christmas Day
- 3) In addition to days specified in (2) the system operator may designate holiday schedule for any other appropriate day.
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