ML17326A422
| ML17326A422 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 12/17/1979 |
| From: | Dolan J INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| AEP:NRC:00268, AEP:NRC:268, NUDOCS 7912270431 | |
| Download: ML17326A422 (45) | |
Text
REGuLAI Y INFO~NATION OISTHIBUTION STE I (HIDS)
ACCESSION
'VBR:7912270431 OOC ~ 0ATE: 79/12/17
~orARIZEO:
NO DOC~ET
~
FACIL:5~0-Dona 1 o C
Cook Nuc 1 ear Power P
1 ant
~ vni t 1i Indi ana 8
05000315 AU 0
316 Ona 1 d C ~
Cook Nucl ear Power P) ant p Qni t 2g Indiana 8
05000316 AUTHOR AFF1LIAT ION DOLAN~ J
~ E ~
Indiana 8 Hichigan Electric Co ~
Hc,C IP. NAtaE RECIPIENT AFFILIATION OENTUNgH AH,'ffice of Nuclear Reactor Regulation
SUBJECT:
Forwards info re voltage level at safety ousesistartupi
'hutdown 6 accident loading sign II low voltage condition cases L transformers capacity in resoonse to 790808 ltro Simolified offsite power sources oversize drawing encl'rsrorsurrou coos:
Aorss cuorss oscsivso:crR s.ucc sus:
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. +0 TITLE.: Onsite Emergency Power Systems'"
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ENCI.
INOIANA L MlcHIGAN ELEcTRIc CQMPANY P. O. BOX IS BOWLING GREEN STATION NEW YORK, N. Y. I0004 December 17,1979 AEP:NRC:00268 Donald C.
Cook Nuclear Plant Unit Nos.
1 and 2
Docket Nos.
50-315 and 50-316 License Nos.
OPR-58 and OPR-74 Mr. Harold R. Oenton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Ittashington, D.C. 20555
Dear Mr. Oenton:
The attachments to this letter provide the information re-quested in Mr. M. Gammill's letter dated August 8, 1979.
By letter dated October 5, 1979, we requested an extension of the due-date for responding to Mr. Gammill's request until December 15, 1979.
By letter dated October 22, 1979, Mr. A. Schwencer granted us the extension as requested.
As the information transmitted herein is being submitted in direct response to a written request for information from the NRC
- Staff, IMECO. interprets 10 CFR 170.22 as requiring that no fee accompany this submittal.
JED:em cc:
R.
C. Callen G. Charnoff R.
S. Hunter R.
W. Jurgensen O. V. Shaller-Bridgman Very truly yours, John E. Dolan Vice President yo6
ATTACHMENT 1 TO AEP:NRC:00268 DONALD C.'OOK NUCLEAR PLANT UNITS 1
AND 2 DOCKET NOS.
50-315 AND 50-316 LICENSE NOS.DPR-58 AND DPR-74
Following the "Guidelines for Voltage Drop Calculations" listed in Enclosure 2 of t1r.
W.
Garrmill's letter of August 8, 1979 (Adequacy of Station Electric Distribution Systems Voltage) we have determined the voltage level at the safety buses for the following configurations:
a.
Safety buses fed from the normal auxiliary power source.
b.
Safety buses fed from the preferred offsite power source, and c.
Safety buses fed from the alternate offsite power source.
For each of the three power sources, a,
b, and c listed above, we have analysed the voltage level at the safety buses as a
result of the the transmission grid low and high voltage conditions as specified in paragraphs 6 and ll of enclosure 2 of your letter.
The minimum expected grid voltage value results from theoretical load flow studies where the following conditions are postulated:
D.
C.
Cook Nuclear Units l. and 2 are down, Palisades i'nuclear Unit 1
is down, the Dumont-Wilton Center kV line is out of service, and the system is transferring 1000 NW toward the '~lest (see Attachment 3 ).
The base case used to conduct this study contains a model of the 1979 summer interconnected transmission system with the AEP internal peak load modeled at 12,250 i~HJ.
This load level is about 750 t1W higher than the actual 1979 sum:er peak load and nearly equal to the pro-jected 1980. summer peak load.
The minimum expected value of grid voltage under these conditions is 1.006 per unit voltage (p.u.)
at the 345 kV level and
.973 p.u. at the 765 kV level.
The maximum expected grid voltage value results from the ollowing assumptions:
D.
C.
Cook Units 1
and 2 out, Palisades Unit 1 out, the Dumont station snychronous condenser out, all of the above during a period of the lightest expected system load conditions.
The maximum expected value of voltage under light load conditions at the 345 kV level is 1.07 p.u.
For the 765 kV system the maximum expected voltage value under light load conditions is 1.04 p.u.
For the 69 kV subtransmission system the lower value of voltage occurs when the 345/138 kV Benton Harbor substation transformer is out of service.
For this contingency, the 69 kV vol tage level at the 69/4 kV substat-;on at Cook Plant attains a low of 0.94 p.u.
The 69 kV high voltage value is 1.05 p.u.
and is based on historic data accumulated over the last year.
In considering which cases to analyze in responding to the NRC concerns expressed in the guidelines of enclosure 2 we have taken account of the fact that for 0.
C.
Cook Units 1 and 2:
- 1) the startup,
- shutdown, and emergency (accident) loads are essentially identical; and 2) the onsite electrical distribution systems are also identical.
We have, in every instance, considered the most adverse conditions that are cr dible for the system under study.
We have addressed below the 13 items listed in enclosure 2 "guidelines":
l.
Separate analysis have been performed assuming the power source to the safety buses are:
a.
The unit auxili'ary transformer (normal auxiliary power source) cases Al, A2, A3, b.
The startup transformer (Preferred Offsite Power Source) cases Bl through 86, and c.
The Alternate Offsite Power Source cases Cl, C2, C3.
The need for electric power is assumed to be. initiated by a shutdown in one unit plus shutdown and an accident in the other unit when the low voltage condition is investi'gated since this assumption presents the largest load demand situation.
- However, when a high voltage condition is investigated (following the demands of guideline i'lo. 11) load demand from one unit only is assumed.
This assumption presents the smallest load demand situation and hence the worst condition from a high voltage situation standpoint.
2.
To comply with the recommendations of guideline Ho.2 we have made the following assumptions:
a.
Plant auxiliaries are fed from transformer bank No. 5.
Transformer bank Ho.
5 nas nearly twice the impedance of transformer bank halo. 'nd therefore presents a worst case situation when low voltage condi tions are being investigated, and b.
Largest load demand for both 0.
C.Cook Units is assumed, i.e.,
shutdown load for one unit plus shutdown and accident load for the other unit (see cases 83, 84, B5, 86 in reference to this guideline).
( *) A detailed description of the cases analyzed is given in.
3, All actions the electric power system is designed to automatically initiate have been assumed to occur as de-signed.
For instance for the low voltage condition cases, when the auxiliaries are fed from the Preferred Offsite Power Source the safety loads have been assumed to start in bulk.
See Cases 84 and 85.
On the other hand, when the Alternate Offsite Power Source is used, sequential loading was assumed, as would be the case in a real life situation.
(see cases C2 and C3).
4.
No manual load shedding has been assumed.
5.
For each event analyzed, the maximum load necessitated by the event and the mode of operation of the plant at the time of the event has been assumed.
This applies princi-pally to the accident loads where redundant loads from the two safety trains have been accounted for, even though, clearly, they are not strictly needed for any particular event.
6.
Guideline Ho.
6 has already been addressed above and the "minimum expected grid voltage" value has been defined.
In the event voltages below the minimum expected value assumed in this study are experienced at the connection'o the offsite circuit, the modifications outlined in Attachment No.
7 will protect the safety loads from trying to operate from a degraded power source.
No Technical Specifications or additional Limiting Conditions for Operation are being oroposed since none can be deduced from the results of this study.
7.
The requirements of guideline No.
7 are covered case by case in Attachment No.
5.
8.
Undervoltage relay setpoints at D.
C.
Cook Units 1 and 2 are as follovs:
a.
4 kV safety buses blackout setting is at 0.60 pu.
Under blackout conditions, all non-safety load is auto-matically shed and the onsite emergency diesel generators are started.
After the diesel generators have attained rated speed and voltage the 4
k~l safety buses are se-quentially loaded.
8.
b.
34.5 kV bus degraded grid voltage setting is at 0.939 pu.
When the 4
kY safety buses are being fed from the Pre-ferred Offsite Power Source (during startup or shutdown),
should the voltage level at the 34.5 kV bus reach the given setpoint, the 4 kV safety buses are separated from the non -safety buses (and hence from the Preferr d Off-site Power Source);
load on the 4 kV safety buses is shed and emergency diesel generators started.
The safety buses are then sequentially loaded as previously described above.
c.
4 kV buses undervoltage alarm is set at 0.90 pu.
When this voltage level is reached an alarm sounds in the control room to alert the operator of an impending 4
kV safety bus low vol-tage condition.
d.
600 volt buses undervoltage alarm is set at 0.90 pu.
Again the purpose of this alarm is to alert the control room operator of an impending 600 volt safety bus low voltage condition.
9.
The voltage profile tables of Attachment Ho.
5 list the voltage levels at the safety buses when the plant auxiliaries are fed from different offsite power sources as described in Attachment !lo.4.
Study of these tables reveals that when feeding from the normal or the preferred power sources, under steady state conditions, no safety bus voltage is outside the 0.90 to 1.10 pu voltage range.
'uring motor starting conditions no 4 kV bus is found to dip below 0.85 pu.
When all the safety load motors are starting in block, voltages below the 0.85 ou are found at.he 575 volt buses ll 8 ard ll C.
However this poses no problems since successful start of the 4-kV motors will improve the voltage conditions to allow re-establishing the 575 volt bus level to more than 905.
When feeding from the 69-kV alternate offsite power sources, some high voltage conditions (above 110~) are encountered that will be corrected as per the modifications proposed in Attachment ho.7.
10.
Even though the safety buses voltage range for normal operation and starting of the safety loads have been found adequate, the dipping of the 34.5 kY bus voltage to 0.924 pu during bulk accident
'loading
,starts is below the, 34.5 kV degraded grid voltage set-point of 0.939 pu with a 2 second time delay.
These sett',ngs will cause spurious tripping of the safety buses under bu1I; starting of the safety loads.
This will violate the recommendations of guideline iso.
12.
Attachment i'lo.
7 includes the proposed, new, undervol:age orotection scheme that will allow the system to accommodate short voltage dios due to motor starting thus avoiding spurious separation of the safety buses from a perfectly adequate offsite power source.
ll.
The requirements of guideline Ho. llhave been met by choosing the transfer with the lowest impedance, whenever there was a choice, while analyzing the safety buses high voltage con-dition (cases Al, Bl, 82).
For instance, in cases Bl and B2 transformer Ho.
4 was chosen over transformer No.
5 as a source for the Preferred Offsite Power system.
Likewise the smallest load demand situation (startup and Accident load, one unit only) was chosen when analyzing the high voltage condition as was already pointed out when discussing the requirements of guideline Ho. 1.
Safety bus high voltage conditions have been found during the analysis of the 69 kV Alternate Offsite Power source.
Proposed recommendations to remedy this situation are listed in Attachment No. 7.
12.
The requirements of guideline No.
12 were already discussed to-gether with the requirements of guideline No. 10.
I 13.
Assumptions made in the analysis have already been presented These assumptions are also listed case by case in Attachment No. 4.
The results presented in this study will be validated by comparison with actual measured data taken at the Oonald C.
Cook Nuclear Plant on the safety buses.
A startup folioving a Unit outage, is required to do this validation.
Presently, Unit 1 is at full power operation and Unit 2 is undergoing refueling, its auxiliaries being fed through the Preferred Offsite Power Source.
However, the refueling load is very small as compared with the capacity of the Reserve Power transformers and therefore cannot be used to validate the results obtained by analysis with a much greater load.
Unit 2 refueling outage will be completed before the end of the year, at which time the Unit 2 startup load using the Preferred Offsite Power Source will be used to measure the voltages at the 345 kV, 34.5 kV, 4 kV and 600 kV volt buses as per tir. Gaa'-ill's letter.
The measured results will be compared with calculai d results using the measured 345 kV voltage and startup load.
The evaluated results will be transmitted to the HRC for inclusion into this report.
ATTACHMENT 2 TO AEP:NRC'00268 DONALD C.
COOK iNUCLEAR PLAtlT UNITS 152 DOCKET t<OS.
50-315 8 50-316 LICENSE NOS.
OPR-58 5 DPR-74
The cases selected for study as a result of the Enclosure 2
guidelines are:
A.
Safety Buses fed from the Normal Auxiliary Power Source Hi h volta e condition Case Al The most adverse case for this condition is to use the lighest load within the constraints of this study, the highest available voltage, and the lowest available trans-former impedance.
Case Al meets all of the above re-requirements and therefore presents the worst case for the high voltage condition when the normal auxiliary power source is used.
Attachment 84 includes a summary of all the cases run in this study.
The parameters used for each case are also listed.
Low Volta e Condition Cases A2 and A3 The most adverse case for this condition is to use the largest load demand, the lowest imput voltage, and the highest trans-former impedance.
Case A2 meets all of the above requirements and therefore presents the worst case for the steady state low voltage condition when the normal auxiliary power source is used.
Case A3 uses same load and configuration as Case A2 except that voltage is calculated during bulk starting of the safety load motors.
B.
Safety Buses fed from the Preferred Offsite Power Source Hi h Volta e Condition Cases Bl and 82)
The most adverse case for this condition is to use the lower impedance transformer (Transformer
.-".4) as a source and to use the lightest possible loading conditions: startup plus accident loading condition (steady state),
one unit only.
Any other cases such as shutdown plus accident (see Case
- 82) or using Transformer i5 as a source wil,l increase the voltage drop in the power distribution sys em and therefore will alleviate the high voltage condition at the safety buses.
Low Volta e Condition Cases 83, 84, 85 and 86 These cases represent the most severe cases for the low voltage-condition; they use the higher impedance Transformer
- -".5 as a
source and the largest possible loading conditions, i.e., Unit 1
shutdown load pIus Unit 2 shutdown accident loading.
For comparison
- purposes, Case B6 uses the startup plus accident load in one unit and the shutdown load in the other unit.
Case B3 considers the steady state safety buses voltage level after all the accident loading has already started.
Case B4 considers the safety buses voltage while the accident loading is starting in block.
Case B5 considers the same loading conditions as B3 and 84 except that the safety load is started sequentially.
Voltage profile is calculated during starting of the last and largest motor.
C.
Safety Buses fed from the Alternate Offsite Power Source Hi h Volta e Condition Case Cl Since there is only one transformer to serve as a.power source in this case, the most adverse conditions result from using the lighest load demand being considered by this study and the highest imput voltage available at this location.
Low Volta e Condition Cases C2 and C3 These cases cover the most adverse conditions at the safety buses should they need to rely for power on the Alternate Offsite Power Source when there is a degraded grid voltage condition on the 69 kV subtransmission system.
Case C2 presents the steady state voltage profile at the safety buses after all the safety loads are operating.
Case C3 presents the voltage profile at its worst during the start of the largest and last motor in the accident load starting sequence.
Operation of the 69 kY Alternate Offsite Power Source is strictly manual.
As such, the'system is loaded sequentially and only one safety train per unit is energized.
The load considered is therefore the Unit 1 shutdown load (one safety train only) plus the Unit 2 shutdown and accident loads (one train only).
ATTACHMENT 3 TO AEP:NRC:00268 DONALD C.
COOK NUCLEAR PLANT UNITS 1
AND 2 DOCKET NOS.
50-315 AND 50-316 LICENSE NOS. DPR-58 AND OPR-74 DONALD C.
COOK NUCLEAR PLANT SI[~1PLIF IED OFFSITE PO'jlER SOURCES ONE-LINE ESK - 103079
ATTACHflENT 4
TO AEP:NRC:00268 l.
Oefinition of Startup,
- Shutdown, and Accident Loading.
2.
Summary of High.and Lofti Voltage Condition Cases Run In This Study.
Load demand during Star'tup conditions include, but are not limited to, the following components (per unit):
Four Reactor Coolant Pumps Two Circulating Hater Pumps One Hotwell Pump One Condensate Booster Pump One Auxiliary Feedwater Pump One Centrifugal Charging Pump One Essential Service Mater Pump One Component Cooling Water Pump One Non-Essential Service Hater Pump Load demand during Shutdown conditions include, but are not limited to, the following components (per unit):
Four Reactor Coolant Pumps Two Circulating Mater Pumps One Hotwell Pump One Condensate Booster Pump One Turning Gear tlotor One Auxiliary Feedwater Pump One Centrifugal Charging Pump One Essential Service Hater Pump One Component Cooling Hater Pump One Non-Essential Service Water Pump Accident load includes, but is not limited to, the following components (per unit):
Two Centrifugal Charging Pumps Two Safety Injection Pumps Two Residual Heat Removal Pumps Two Component Coolirg Water Pumps Two Auxiliary Feedwater Pumps (a total of two for both units)
Two Containment Spray Pumps Two Non-Essential Service Hater Pumps Shutdown load (per unit)
= (27.515 +j 21.095) mva
= 34.67 mva Startup load (per unit)
= (29.919 +j 16.526) mva
= 34. 18 mva Accident load (per unit)
=
( 3.716 +j 2.542). mva
=
4.5 mva Some safety load is already running during startup and/or shutdown and therefore this load is not included in the accident load (4.5 mva).
GSU SOURCES CASE Al:
Normal Auxilary Power Source (Unit No.
1)
High Voltage:
369 kv Startup plus Accident Load in one unit only = 33.635 +j 19.057 mva
= 38.66 mva total TR1 (345 kv UAT Source),
lower impedance
=
11.55 on 1300 mva base Steady state analysis (after safety motor s have started)
CASE A2:
Normal Auxiliary Power Source (Unit No. 2)
Low Voltage:
744.35 kv Shutdown plus Accident Load in one unit only = 31.231 +j 23.637 mva
= 39.17 mva total TR2 (765 kv UAT Source),
higher impedance
=
16.5/ on 1300 mva base Steady state analysis (after safety motors have started)
CASE A3:
Normal Auxiliary Power Source (Unit No. 2)
Low Voltage:
744.35 kv Shutdown plus Accident Load in one unit only = 31.231 +j 23.637 mva
= 39. 17 mva TR2 (765 kv UAT Source),
higher impedance
=
16.5'n 1300 mva base Transient (during starting of all safety motors)
RESERVE SOURCES CASE Bl:
Preferred Offsite Power Source High Voltage:
369 kv Startup plus Accident in one unit only = 33.635 +j 19.057 mva = 33.66 mva total TR4 (lower impedance)
= 17.25~
345 mva base Steady state (after sfaety motors have started)
CASE 82:
Preferred Offsite Power Source High Voltage:
369 kv Shutdown plus'ccident in one unit only = 31.231 +j 23.637 mva
= 39.17 mva total TR4 (lower impedance)
= 17.25% 345 mva base Steady state (after safety motors have started)
CASE 83:
Preferred Offsite Power Source Low Voltage:
347 kv Shutdown and Accident in one unit, shutdown in other unit = 58.746 +j 44.732
= 73.
84 mva total TR5 (l.arger impedance)
= 16.2'.! 150 mva base Steady state (after safety motors have started)
CASE 84:
Preferred Offsite Power Source Low Voltage:
347 kv Shutdown and Accident in one unit, shutdown in other unit = load measured during start of the safety motors in block TR5 (larger impedance)
= 16.2',l 150 mva base Transient (during starting of all safety motors)
CASE 85:
Preferred Offsite Power Source Low Voltage:
347 kv Shutdown and Accident in one unit, shutdown in other unit = load measured during the start of the last and biggest of the safety motors.
TR5 (larger impedance)
= 16.2i. 150 mva base Transient (during starting of last and largest safety motor)
CASE 86:
Preferred Offsite Power Source Low Voltage:
347 kv Startup and Accident in one unit, shutdown in other unit = 61. 15 +j 40. 152
= 73. 15 mva total TR5 (larger impedance)
= 16.2".. mva base Steady state (after all safety motors have started) 69 kv:
ALTERNATE OFFSITE PO'HER SOURCE CASE Cl:
High Voltage: 72.45 kV Shutdown and Accident in one unit, shutdown in other unit
= 5.672 +j 3.286
= 6.56 mva TR12 EP (picks up one train in each unit )
= 75 7500 Kva base Steady state (after all safety motors have started)
CASE C2:
Low Votage:
64.86 kV Shutdown and Accident in one unit, shutdown in other unit
= 5.672 +j 3.286
= 6.56 mva TR12 EP (picks up one train in each unit)
= 7X 7500 Kva base Steady state (after all safety motors have started)
CASE C3:
Low Voltage:
64.86 kV Shutdown and Accident in one unit, shutdown in other unit
= Load measured during the start of last and biggest safety motor.
TR12 EP (picks up one train in each unit)
Transient (during starting of last and biggest motor)
ATTACHMENT NO.
5 TABULATIONS ON SAFETY BUS YOLTAGE PROFILES FOR EACH CASE RUN IN THIS STUDY
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ATTACHMENT NO.
TABLE I:
TRANSFORMERS'APACITY AND IMPEDANCE YAL'IES.
TABLE II:
TRANSFORMERS'APACITY AND LOAD DEMAND FOR EACH OFFSITE POllER SOURCE.
TABLE I UNIT TRANSFORMER UANTITY IMPEDANCE 1 and 2
1 and 2
1 and 2
1 and 2
1300 mva, 345/26-kv Unit 1 step-up transformer TR-1 18/24/30 mva, 26/4-kv Transformers 1
AB and 1
CD 18/24/30 mva, 34.5/4-kv Transformers 101 AB and 101 CD 1300 mva, 765/26-kv (3-433 mva)
Unit 2 step-'p transformer TR-2 18/24/30 mva, 26/4-kv Transformers 2 AB and 2
CD 18/24/30 mva, 34.5/4-kv Transformers 201 AB and 201 CD 345 mva testiary, 765/345/34.5-kv Transformer No.
4 150 mva, 345/34.5-kv Transformer No.
5 7.5 mva, 69/4-kv Transformers 12 EP-1, 12 EP-2 1.5 mva 4 kv/600-volt Transformers TR11A, TRllB,
- TR11C, TR11D, TR21A, TR21B, TR21C, TR21D 11.5%
1300 mva base 9.6%
18 mva base 6.48%
18 mva base 16.5%
1300 mva base 9.6%
18 mva base 6.48%
18 mva base LV-testiary + reactor-l7.5" 345 mya base 16,2%
t 150 mva base 7%
7500 kva base 8%
1500 kva base
TABLE 1
CONTINUED UNIT TRANSFORt1ER QUANTITY IMPEDANCE 1
and 2
1 mva, 4-kv/600-v Transformers TR11BHC, TRllCt1C, TR21BflC, TR21CHC 5.83K 1000 kva base 1 and 2
1 mva, 4-kv/480-volt Transformers TRllPIIA, TRllPHC, TR21PHA, TR21PHC 8.83K 1000 kva base
TABLE Il urflT SOURCE TRAHSFORNER CAPACITY SHUTDOkkN STARTUP
~LOAO llVA LOAD llVA 1*
Normal Aux Power Preferred Offsite Power 1 and 2
Preferred Offsite Power 1 arid 2 Alternate Offsite Power 30 NVA, TR1AB 30 NVA, TRlCD 30 NVA, TR101AB 30 NVA, TR101CD 345 NVA, TR 4 150 NVA, TR 5 7.5 NVA, TR 12EP 15.066
+ j 11.357=18.9 16.165
+ j 12.28 =20.3 15.066
+ j 11.357=18.9 16.165
+ j 11.28 =20.3 58.746
+ j 44.732=73.8 58.746 + j 44.732=73.8 5.672 + j 3.286= 6.56 61.15 61.15
+ j 40.152=73.2**
+ j 40.152=73.2A*
19.524
+ j 10.956=22.4 14.111
+ j 8.101=16.3 19.524
+ j 10.956=22.4 14.111
+ j 8.101=16.3 Auxiliary Power Distri-bution Trf's Auxiliary Power Distribution Trf's Pressurizer Heaters Trf's 1.5 NVA, TRllA TRllB, TR11C, TR11D 1.0 NVA TRllBNC, TR11CNC 1.0 NVA TRllPHA, TRllPHC
.854 + j
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.676
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.485= 0.832
.513 + j
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.679 + j
.006= 0.679
.362 + j
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- Startup
& Accident in one Unit, Shutdown in other Unit
ATTACHMENT NO.
7 TO AEP:NRC:00268 STATION ELECTRIC DISTRIBUTION SYSTEM UNDER VOLTAGE PROTECTION MODIFICATIONS
PROPOSEO MOOIFICATIONS l.
Install 4
kV safety bus under voltage protection at buses A and 0 Units 1 and 2.
Voltage setting
=
89.9~
Time setting
=
2 min.
2.
Modify existing under voltage relay blackout setting (at the 4
kV buses) as follows:
Voltage setting
=
79.9~
Time setting 2 sec.
3.
Institute administrative controls to prevent feeding both buses of one safety train from two different offsite power sources.
4.
Change tap settings on the 69/4 kV alternate power source transformer from 67 kY to 68.8 kV to reduce probability of over voltage conditions at the safety buses due to high voltage conditions on the 69 kV subtransmission system.
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