ML19309G757

Forwards Addl Info Re Adequacy of Station Electric Distribution Sys Voltages & Replacement Pages for 791207 Rept in Response to NRC 800229 Request

ML19309G757
Person / Time
Site:	Hatch
Issue date:	04/28/1980
From:	Widner W GEORGIA POWER CO.
To:	Office of Nuclear Reactor Regulation
References
TAC-10026, TAC-12831, TAC-12832, TAC-47044, NUDOCS 8005070508
Download: ML19309G757 (40)

Text

{{#Wiki_filter:. b Georgi 3 Pow:r Company 8005070 230 P;achtree Street Post oMica Box 4545 At'anta. Georgia 30302 Telephone 404 522-6063 m Fower Generation Department Georgia Power trv scomn e+.tra system April 28, 1980 U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington, D. C. 20555 NRC DOCKETS 50-321, 50-366 OPERATING LICENSES DPR-57, NPF-5 EDWIN I. KATCH NUCLEAR PLANT UNITS 1, 2 4 ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES Gentlemen: On December 7, 1979, Georgia Power Company submitted a system voltage study in response to a Commission request for information dated August 8, 1979. The Commission requested additional information regarding our December 7, 1979, response on February 29, 1980. Enclesure 1 responds to the specific items requested by your February 29, 1980, letter. Enclosure 2 provides change pages for the report sub-mitted by our December 7, 1979, le.tter. Very truly yours, -?>v y 3,, t. v/. .s. w-u a.',:, ~ W. A. Widner Vice President and General Manager Nuclear Generation RDB/mb Enclosure xc: Ruble A. Thomas George F. Trowbridge, Esquire R. F. Rogers, III ko/S~ s //

i ENCLOSURE 1 RESPONSE TO QUESTIONS i NRC QUESTION 1 1. Reference a does not define the minimum and maximum antihipated grid b allows three methods of determining the value of voltages. Guideline 6 the degraded grid voltage, whichever provides the worse case. GPC should describe how their grid voltage levels are determined (one method may produce the low voltage while another method may produce the high voltage) and state what these values are. GPC RESPONSE Station service for Plant Hatch is supplied from the 230 kV bus. The minimum steady-state voltage, based on experience as stated in 6a Ref. C, has never degraded below 99% on this bus. Item 6 of the guidelines for voltage drop calculations specifies that the " minimum expected value" of grid voltage be selected in order to calculate subsequent voltage drops. Based on station service load requirements and grid contingency studies at Plant Hatch, the 98% to 104% range has been determined to meet our systems' needs for safe starting and operarfon of all equipment on the emergency buses. As stated in our submittal of December /, 1979, we found two contingencies to be most limiting to our system in assuring adequate supply voltages to the station services at Hatch. These contingencies are as follows: 1. Loss of U1 and U2 simultaneously. 2. Loss of the 500-230 kV auto-transformer bank while U1 is down for maintenance. The second contingency presents the worst condition, although in both cases, the voltage dropped below the 98% limit. In order to keep all distribution load voltages for both the steady-state and transient conditions at our self-imposed operating level, corrective action has been proposed and will be implemented to always maintain the low limit of 98%. The contingencies were calculated for periods of peak demand and with Plant McManus off. This is somewhat unrealistic, due to the fact that Plant McManus is operated specifically during peak periods. In addition, a 400 kV tie is established between Georgia and Florida and this is assumed to remain connected during voltage fluctuations. Again, this is also misleading since relays have been installed on the Florida-Georgia border to cut-off this tie in case of degraded conditions. The under MRD/mb i 4/28/80

voltages relays are set at 85% on this line, and a voltage degradation that far from the plant would split the two systems before any appreciable degradation occurred at Plant Hatch. As discussed above, the approach used in determining worst case contingencies was extremely conservative. In every case, we assumed the worst conditions possible, even if they were somewhat unrealistic. The studies have shown that our method of operation will keep the voltage limits between 98% and 104% of nominal. One last word on the high voltage limit. In the case of high voltage, it is constantly regulated to 104% or below. In this case we have total control over the situation since it means that we are possibly generating more than the load requires and the generators' outputs are automatically regulated down to match the load. Finally, it should be emphasized that we supply power to industry which has stringent tolerances on voltage fluctuations. Many machines have voltage relays protecting them, and in order to continue to supply industry reliably, we must stay within specific voltage limits. This provides an additional constraint which will insure that system voltage remains within our self-imposed limit (98% to 104% of nominal). I i 1 l l l MRD/mb 4/28/80

NRC QUESTION 2. Supply the calculated voltages for all low voltage AC (less than 600V) class 1E buses for each analyzed case. Do these systems supply any instruments and control circuits as required by GDC 137 If so, is all equipment capable of sustaining the analyzed voltages (blowing fuses) overheating, etc.)? Is the connected equipment qualified by the manu-facturer to withstand the expected voltages without affecting their ability to perform the required function? GPC RESPONSE The calculated voltages for all low voltage buses is supplied for each analyzed case in revised Figures 1 through 14 in the attached report. The buses may supply instruments and control circuits as required by GDC 13. We do not know of any connected equipment which is not capable of sustaining the analyzed voltages. However, not all manufacturers' responses are yet available. If any equipment is dis-covered which does not meet the functional requirements in the expected conditions, it will be the subject of a report to the NRC. I RDB/mb 4/28/80 1 0

NRC QUESTION ~ 3. What are the voltages and duration on all class 1E buses when starting and running a 7000-HP reactor re-cire M-G set? Justify continued operation of the class 1E loads for this duration and describe how spurious trips of the class 1E buses and loads are prevented during this D time period. The intent of NRC guideline 3 was that during the worst case (LOCA) loading conditions consideration should be made for any possible start of a large non-safety load. The analysis would then show the resultant voltages for all safety-related loads (buses) during the transient (start) and the steady-state (running) stages. The voltage on the other buses should be provided for the transient and steady-state stages. c GPC RESPONSE An interlock scheme exists to prevent a 7000 HP reactor recirculation M-G set from being tied to an essential bus or fed from the same source as an essential bus during an accident condition (i.e., LOCA). Non-safety loads on buses A, B, C and D are prevented by the logic scheme from being connected to the safety transformers when the safety loads are in operation. In addition, it should be noted that in an accident situation such as a LOCA, once a trip signal is initiated, the recirculation pumps are physically separated (via opened breaker) from their power supplies. The time needed to restart a recirculation M-G set and pump is on the order of an hour. These pumps cannot immediately be restarted due to their startup logic scheme. The study has learly shown that all motors on the essential buses can be restarted without any adverse effect during periods of continuous degraded voltage. During starting, the voltage may collapse to a value which will still enable one to start all essential motors within a period of 12 seconds or less. Note that under the worst motor starting condition presented in this stu.ly, the acceleration time for a starting motor is at most 12 seconds. Additionally, all safety-related motors have a 75% motor voltage starting capability and a full load carrying capability at 70% nameplate voltage for at least 30 seconds. Finally, since the essential buses have undervoltage relays to detect a depressed voltage, these relays can tolerate the voltages shown on Figure 14 on the 4160V buses for at least 16 seconds, thus overriding any transient undervoltage i condition and therefore preventing any spurious trips. Oare we established a minimum for the grid which we will maintain, the study shows the resultant voltages for all safety-related loads (buses) during steady-state (running) and transient (start) stages. Figures 10, I 11, 12, and 13 show the steady-state conditions, while Figure 14 indicates the transient conditions. MRD/mb 4/28/80

6 Note in Figures 10 and 11, Case 2A-1, the analysis was done assuming. buses A and B were loaded on C transformer when in fact, during a trip condition, these buses are stripped. Again, this indicates additional conservatism added to the calculations. As shown on Figures 10 and 11, for Case 2A-1, all loads which come off the 1D/2D and IC/2C trans-fermers are included in the analysis whether they are safety-related or not. Finally, during normal operation, the permissible voltage variation for a motor is + 10% of its nameplate voltage rating. MRD/mb 4/28/80

NRC QUESTION 4. What are the bus undervoltage relay settings and time delays? Will spurious tripping of safety loads occur during analyzed conditions? b This is requested per guidelines 8, 10, and 12, GPC RESPONSE The undervoltage relays on all essential buses are set at Tap 93V and Time Dial 2 (T.D.-2). With these settings, the relays will trip at the minimum calculated voltages provided in the study for starting motors within 16 seconds. Under the worst motor starting condition presented in this study, the acceleration time for a starting motor is at the most 12 seconds. Since all motors in this depressed voltage condition will start within 12 seconds (motor acceleration time), no spurious tripping will occur for these transient cases. l MRD/mb 4/24/80

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NRC QUESTION 5. Is it possible that the units' unit auxiliary transformers would supply the class 1E load group? If nothing prohibits such a connection, this analysis should be performed as guideline Ib requires. CPC RESPONSE No, it is not possible for the units' auxiliary transformers to supply the class 1E group, since the source breakers feeding the station service buses from the reserve aur.111ary transformers and the units' auxiliary transformers are interlocked,. Although the interlock scheme could be defeated manually and both scurce br2akers may be closed at the same time to feed a particular bus, this will never be permitted except during synchronized transfer from one source to another to keep the bus hot. Hence, under no circumstances will the units' axuillary transformers be allowed to feed any of class 1E buses. The enclosed one line diagrams of Hatch Units 1 and 2 station service distribution buses (sheets 5-60 and 5-61) show the breakers' interlock scheme by broken lines. They also show that safety buses 1E, 1F, 1G, 2E, 2F, and 2G could only be supplied by the reserve auxiliary transformers or diesel generators. J i i MRD/mb 4/28/80

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.RC QUESTION 6.

Figures 15 and 16a compare the calculated voltages with the measured voltages for the 4160 V buses. They do not verify the accuracy of the calculations for the 600 V AC and lower voltage buses. GPC should provide test procedures and test results as required by reference b. CPC RESPONSE Appendices B, C and D of the study cantain measured values for the 600V and lower buses. This information was utilized in establishing the loads on the 41COV buses. The transformer tap settings are known between the 4160V and 600V buses and between 600V and lower buses. This information also is utilized in developing the model. When the 4160V buses are subjected to the various conditions studied by the model, the entire network of buses has been lumped into the 4160V buses. This has been accomplished by the assignment of loads to the 4160V buses which represent the loads from the low voltage buses. Thus, when the model accurately calculates and predicts the voltages for the 4160V buses, we have assurance that the lower voltage buses have been modeled correctly. Otherwise, the model would not so closely correspond with measured values. 1 MRD/mb 4/28/80

NRC QUESTION 7. Reference a establishes a possible scenario which could result in un-acceptable voltages. The attachments to reference a identify several possible corrective measures, yet reference a does not commit to cor-b rective action. Per guideline 9, GPC must inform the NRC of the immediate remedial action that has been taken. CPC RESPONSE The information submitted in response to question 1 covers this question adequately. To commit to a specific corrective course of action would foreclose many options which we have for operating our system. Our study demonstrated that adequate protection exists when the system voltage range is between 98 and 104%. We also indicated that our intent is to remain in this range inasmuch as it is required for the proper operation of Plant Hatch. Finally, we do not believe that any com-mitment for a specific corrective course of action is warranted. The conditions described which could lead to unacceptable voltage values are created, not by the equipment failures or operating conditions at Plant Hatch, but by operating the entire transmission system in specified manners. We have chosen, as we stated in our December 7, 1979, sub-mittal, not to operate our system in the way described by the contin-gencies producing unacceptable results, without physical modifications. If and when physical modifications such as installation of capacitor banks is accomplished, it will be to improve operational flexibility. However, should revised system operation in the future indicate the need for such modifications to protect the 98% to 104% range at Plant Hatch, the NRC will be promptly notified. MRD/mb 4/28/80 i

s e i NRC QUESTION 8. Figure 7 and 14a do not show what the resultant bus voltages are on the 600V buses (and lower voltage buses). Duration of this motor starting transient are not identified. GPC should verify that the other class lE buses and loads are not being subjected to undervoltage problems resulting from this transient condition, per guidleine 9b. GPC RESPONSE Revised Figures 7 and 14 show the resultant bus voltages on the 600V and lower buses. Under the worst motor starting conditions presented in the study, the acceleration time for a starting motor is at most 12 seconds. This is well within their capability to withstand the transient. We have concluded in the report that maintenance of the 230 kV bus at Plant Hatch within the range of 98 to 104% does not produce unacceptable results for all analyzed conditions. 4 8 e RDB/mb 4/28/80

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References:

Georgia Power Company (GPC) letter (R. J. Kelly) to NRC, " Adequacy a. of Station Electric Distribution System Voltages", dated December 7, 1979. b. NRC generic letter to all Power Reactor Licensees, " Adequacy of Sta-tion Electric Distribution System Voltages", dated August 8,1979. S 4 I i

ENCLOSURE 2 REVISION SHEET Revision No. Pages and Figures and Date Major Change Affected 1-11/26/79 Motor starting Cases 3 and 3A: Table of Contents simultaneous start of two core spray Pages 2, 8, 9 pumps, four RHR pumps and one conden-Figures 7 and 14-sate pump under LOCA Appendix D deleted 2-4/11/80 600 V loads expanded to show voltage Table of Contents icvels for 208 V loads Pages 2 through 10 Figures 1, 2, 10, 11, 12, 13, and 14 Added Appendix D i 0 4 i

- -= REVISION 2 7, - s J h Table of Contents Introduction 1 I Assumptions 2 Conclusions 4 Recommendations . 5 i Discussion of Results 6 i Appendix A Appendix B Appendix C i Appendix D Rev. 2 1 i i i .i i L I i i t, ' 9---r =y- -'- -.y y p + - ..,-y. -,.m. ycy-.m.e e+- +--.9.--t-W Tw&M P P F

5 Introduction Objective: This study was conducted to determine the voltage limit require-ments of the 230 kV system at Plant Hatch. These voltage limits are required to provide adequate voltage regulation and motor starting capability in the operation of the station auxiliary system emergency busses for Hatch Units 1 and 2 from the offsite power source (230 kV system) under expected system conditions. This study did not consider the onsite power source (diesel generators). Scoce: To determine the minimum and maximum voltage limits for the offsite power source to enable adequate operation of Hatch Units 1 and 2 emergency busses under expected system conditions. Also to verify the analytical study by comparison with field. readings. l l t I l

a Assumptions The following assumptions are made for voltage study calculations. 1. The maximum station auxiliary bus voltage occurs when the offsite power scurce voltage is at its maximum expected level and the auxiliary bus loads are at their minimum expected level. 2. The minimum station auxiliary bus voltage occurs when the offsite power source voltage is at its minimum expected level and the auxiliary bus loads are at their maximum expected level. 3. The worst motor starting condition occurs under LOCA (loss of coolant accident) during automatic and simultaneous starting of the emergency R'ev. 1 loads. flotor starting is studied for the minimum system-voltage and. LOCA condition with the remaining unit being under normal shutdown condition. 4. The maximum expected normal running load is the same as that recorded on 9-14-79 ( Appendix A) when both units were under normal operation. 5. All 600 V bus loads remain the same under all study cases except under the motor startirig coiidition. 6. The maximum expected 208 V bus loads are the same as that recorded on ~ March 28, 1980 and April 3, 1980 (Appendix D) except for Hydrogen Recomb. system for Unit 2. The maximum expected load for this system is 75 kVA. Units 1 and 2 have identical loads for 208 Y systems except for the intake structures. 7. A power factor of 85% for the running load when power factor data is not Rev. 2 available. 8. The expected mininum and maximum system equivalent positive s wuence impedances are 0.042 + j0.937 and 0.12 + jl.49, respectively. These impedances are in percent on a 100 MVA, 230 kV base. The minimum impedance represents normal system with all units and lines in service. The maximum impedance represents Hatch Units 1 and 2 off-line system condition. 2

a 4 9. The minimum system impedence is used with the maximum system voltage condition and the maximum system impedance is used with the minimum system voltage condition.

10. The test report and/or nameplate impedance are used for all RAT's &

4160-600V auxiliary transformers. 11. Nameplate impedances are used for 600-208/120V transformers for Unit Rev. 2

1. 1. All impedences for the 600-208/120V transformers for Unit 2 are assumed to be the same as those for Unit il for the same kVA rating and application.

12. For Unit 2, a Z of 2% is used for the 15 kVA, 600-208/120V intake structure transformers.

13. All RAT's and 4160-600V transformers have tap settings of 1.0 p.u. in service.

14. X to R ratios used for the 4160-600V transformers are 8 for 1400 kVA and 3 for 225 kVA and smaller. 15. X to R ratios used for the 600-208/120V transformers are as follows: Three Phase Transformers Sinole Phase Transformers 112.5 kVA : X/R = 1.77 37.5 kVA : X/R = 1.53 45 kVA : X/R = 1.30 30 kVA : X/R =.92 15 kVA : X/R =.57

16. All safety related motors have the following nameplate voltage ratings:

Nominal 4160 V Bus Connection: 4000 V Nominal 600 V Bus Connection: 550 V Rev. 2 Nominal 480 V Bus Connection: 460 V Nominal 208 V Bus Connection: 208 V

17. All safety related motors have 75% motor voltage starting capability.

18. All safety related motors have full load carrying capability at 70%

nameplate voltage for at least 30 seconds. 19. During normal operation, permissible voltage variation for a motor is + 10% of its nameplate voltage rating. I 20. Under the worst motor starting condition presented in this study, the l acceleration time for a starting motor is at the most 12. seconds. l l 3

a .t Conclusions 1. Since present-day field readings are used to estimate the bus loads for the study cases without any supportivt past field readings, a 5% load margin should be assumed to account for load fluctuations'in the field readings. Case 2A, Figures 10-13, shc4 the voltage and load levels with this 5% margin. The 208V system 'oads are the same as those shown in Appendix D. 2. For present tap setting of 1.0 pu in all RAT's and minimum and maximum study loads with 5% load margin, the auxiliary system can sustain a maximum 230 kV bus voltage of 239.2 kV (104%) and a minimum 230 kV bus voltage of 225.40 kV (98%). 3. All 4160-600V transformers require 1.0 pu tap setting and all 600-208/120V and 600-480V transformers require 0.925 pu tap setting. 4. Feeders' to 3HP air compressor motors on 208V diesel building MCC-1 A and MCC-lc should be changed from the existing 1-4/C, #12 to 1-4/C, #6 to obtain acceptible voltage levels. Rev., 5. No new loads which would affect the study cases can be added to the existing busses. 6. The bus loads under maximum auxiliary load condition are within transformer's rated kVA capabilities. 7. Under the maximum and minimum system voltage conditions, the motor terminal voltages are acceptable for the respective minimum and maximum bus load conditions. 8. For the worst case motor starting, motor terminal voltages of the starting motors and other running motors are within their capabilities. i 6 4

4 = Recommendations 1. The voltage levels for the 230 kV bus should be maintained within a 5% band. 2. Tap settings in all RAT's and 4160-600V transformers should be 1.0 pu (the existing tap setting in the field). The transformers with lower than 600V rating should have 0.925 pu tap setting. This.may require changing the existing tap settings in some of these transformers. 3. Feeder cable to 3HP Air Compressor motors on 203V Diesel Building MCC's lA and 1C should be changed from 1-4/C, #12 to 1-4/C, !6. 4. Future load additions should be reviewed carefully to determine if Rev. 2 they affect the study results. 5. The auxiliary bus load should be recorded on a routine basis per the procedure outlined in Appendix A and tabulation given in Appendix D. 6. An attempt should be made to balance the icads on the X and Y windings of the three winding transformers. Thase transformers are: UAT's (Unit Auxiliary Transformers) 1A and 2A and RAT's ID and 20. t i 3

5 Discussion of Results Seven cases have been investigated to detennine the steady-state voltage regulation, motor starting and verification of calculated results versus field readings. Cases 1, 2, and 3 investigate the minimum and maximum auxiliary system voltages for transient and steady-state conditions using load dat' ;iven in Appendices A, B, C and D. Portions of this load data is obtained from field readings and no margin has been added to it. For these three cases the minimum allowable system voltage is 97% of 230 kV. Case 1A restudies the voltage regulation of Case 1 with the system voltage of 105% of 230 kV. Case 2A restudies the voltage regulation of Case 2 with loads 5% larger than that based on field readings. The minimum acceptable system voltage for Case 2A is 98% of 230 kV. The maximum, acceptable 230 kV bus voltage for Cases 1 and 1 A is 104% of 230 kV. Case 3A is the motor starting case for the system voltage of 98% of 230 kV and loads 5% larger than that based on field readings shown in Case 3. The details for the 208 V systems are shown for the cases related to the recomended system voltage range of 98-104%, only. Rev. 2 These cases are run using the existing tap settings in all RAT's and 4160-600 V transformers of 1.0 p.u. A tap setting change to 0.975 p.u. in the RAT's would yielc an allowable 230 kV bus voltage operating range of 101.4% to 95.4% for cases similar to Case 2A. These cases have the 5% increase in loads for margin. For other tap settings the allowable 230 kV bus voltage range would be different but still within a 6% band. It is important.to note that Case 1A,. Figure 9 gives the maximum 600 V bus voltage of 111.13% on 550 V motor base. This voltage although outside the +10% of the 550 V motor continuous rating is considered acceptable for a short duration for the following reasons. (a) The overvoltage exceeds the rated continuous voltage by only 1.13% at the 600 V bus. (b) The motor terminal voltage will be lower due to cable voltage Rev. 2 drop frem the 600 volt bus to the motor terminal. (c) These voltages of 111.13% are expected to occur only on rare occasions and for only short durations when the 230 kV system j voltage reaches a maximum of 241.5 kV. i 6

(d) The consequences of high motor voltage is loss of motor insulation life. The short duration expected is not expected i to yield any measurable loss-of-life in the motor. (e) It is likely that the 230 kV bus voltage will be regulated below 241.5 kV in which case the 600 V bus voltages would never exceed 110% of the 550 volt motor voltage. Case 4 verifies the calculating techniques as documented below. Voltace Study Cases: The following are considered for bus voltage regulation and motor starting under worst case conditions. 4 1 Case 1 - Maximum system voltage and minimum load condition This condition occurs when one unit at the plant is under normal operation and the other unit at the plant is under re-fueling operation. l See Figures 1-2 for the detail voltage and load levels. The resultant voltages are within acceptable levels. The loads are considered as follows. 1. Unit under normal operation: Bus loads: Load for emeroency busses from Appendix B. The loads for Rev. 2 the 208V system is 5% of the 600-208/120V transformer kVA rating.. 2. Unit under re-fueling: 4 kV loads: Unit 1 Unit 2 i HP Full Load kVA HP Full Load kVA i 1 RHR @.9 pf. 1000 894 1000 894 2 Service Water Pumps @.897 pf .1400 1248 1400 1248 1 CRD Pump 0.875 pf 250 236 250 236 600 530 1 Chiller 0.85 pf TOTAL 2650 23789 3250 2908 9 l .896 pf .888 pf kVA Load 0 80% Demand Factor 1902 0.896 pf 2325 9 .888 'pf. 600 V Bus loads: Load for emergency. busses.from Appendix B. The loads for-the 208V system is 5% of the 609-208/120V transformer kVA rating. Rev. 2 7

Case 2 - Minimum system voltage and maximum load condition. 'This is the condition of simultaneous shutdown when one unit at the plant is under LOCA and the other unit at the plant is under normal shutdown. See figures 3-6 for the detail voltage and load levels. The resultant voltages are within acceptable levels. The following bus loads are considered: 1. Unit Under LOCA: 4 kV loads: Loads per Appendix A with a deduction for the two reactor recirc water numps on Busses A and B at their 803 full load kVA and.85 pf Rev. 1 and the addition of two core spray pumps and four RHR pumps. Two reactoi-recirc water pumps drop out autcmatically durinc LOCA condition. 600 V Bus loads: Loads per Appendix A Rev. 2 2. Unit Under Normal Shutdown: Bus loads: Loads per Appendix A plus two core spray pumps and four RHR pumps. Rev. 1 3. Loads on each reserve auxiliary transformer (RAT) for this case are as follows: LOAD ( MVA. of ) RAT - 1D or 20 Unit & Condition RAT-1C or 2C X - Winding Y - Winding Unit 1 a. LOCA 9.46, 0.850 9.39 0.865 14.78 0.868 b. Normal Shutdown 19.33, 0.850 9.39 0.865 14.78 0.868 Unit 2 a. LOCA 8.86, 0.850 12.94 0.868 10.76 0.862 b. Normal Shutdown 18.74, 0.850 12.94 0.868 10.76 0.862 NOTE: RAT's ratings are as follows: IC or 2C: 230-4.16 kV, 15/20/25/28 MVA, OA/FA/F0A/650C 0 10 or 20: 230-4.16-4.16 kV,18/24/30/33.6 MVA, 0A/FA/F0A/65 C Rev. 1 0 X-Winding - 9/12/15/16.8 MVA, 0A/FA/F0A/65 C 0 Y-Winding - 9/12/15/16.8 MVA, 0A/FA/F0A/65 C 8 k

Case 3 - Motor starting under minimum system voltage and maximum auxiliary bus loads. Simultaneous starting of two core spray pumps and four RHR pumps because of the automatic action due 'to LOCA condition and a condensate pump because of the dropout of one of the running condensate pumps is considered the worst Rev. 1 motor starting condition when Unit l~is under LOCA and Unit 2 is under normal shutdown condition. See Figure 7 for the detail voltage and load levels. The starting motors terminal voltages are within acceptable levels. The following loads are considered: 1. Unit 1 Under LOCA 4 kV loads: Same as Item 1 under Case 2 above minus the full load kVA of Rev. 1 two core spray pumps and four RHR pumps that are assumed to be started. 600 V Bus loads: Same as Item 1 under Case 2 above and the addition of 150 kVA MOV's load (intermitten load) to the 4.16 kV Bussas lE, 2E,1G, and 2G. This intermittent load is adopted from the FSAR's for Units 1 and 2. 2. Unit 2 Under Normal Shutdown Condition Bus loadt: Same as Item 2 under Case 2. Case 1 A - Maximum voltage and minimum load condition. This case is same as Case 1 except that the 230 kV bus voltage is raised to 105%. This. case is studied to determine the auxiliary sy. stem voltagbs. for the 230 kV system equipments maximum voltage rating. See Figures 8 and 9 for the detail voltage and load level. The bus loads considered are the same as those for Case 1. The 208V system is not shown in detail. Case 2A - Minimum system voltage and maximum load condition. This case is same as Case 2 except that the load based on the field readings on each bus is raised by 5% to determine the minimum acceptable system voltage including 208 V system shown in detail with loads 'same as shown in Appendix D. Rev. 2 Figures 10-13 show the voltage and load levels. The required system voltage is I 98% of 230 kV at the 230 kV bus. 9 L

l Case 3A - Motor starting under minimum system voltage and maximum auxiliary bus loads. This case is same as Case 3 except the system voltage is 9P%, the minimum required for the maximum load condition of Case 2A, and the 5% higher loads based on the field readings including the worst case 208V' bus shown in detail with the loads as per Appendix D. See Figure 14 for the detail Rev. 2 voltage and load levels. The starting motors terminal voltages are within acceptable levels. Test and Analysis Verification: To verify the adequacy of the analytical results for the afore-mentioned voltage studies, a test was performed at the plant. This test was perfomed on October 10, 1979 with the existing system and unit con-ditions at the plant. This test was intended to demonstrate our ability to calculate the voltage at various busses accurately and not to duplicate { the analytical cases studied. Field testing which duplicates these specific analytical cases is impractical. The test procedure and test readings are documented in Appendix C. The bus loads and source voltages (230 kV bus and Generator bus) are used to run the same load flow program as that used for the analytical studies to determine the voltage at various 4.16 kV busses. A tabulation on page C-15 of Appendix C shows the bus loads used for Case 4 which presents the verification of analytical study. Figures 15 and 16 show the results for this case. The calculated bus voltages are very close to the field readings. The maximum variation was found on the combined busses 1A and IB which was 0.58%. The field readings cannot be duplicated i exactly because of 1. Metering accuracy 2. Readings cannot be taken at the same instant'at all busses l ~3. Unbalance in the voltage and ampere readings. [ The variations found in the calculated values when compared to the field readings are well within an acceptable range for reasons mentioned above and therefore the calculating technique used in the analytical studies is con:idered acceptable. 10

Figure 1 - Hatch Units 1 & 2 / Station Auxiliary System - Offsite Source 'la'd "',jUay'iZ "d *@ s tinit I under normal operation

• ='

Unit 2 under re. fueling 53s V

• 104, 0.042 + j0.937 1 230 kV Plant Bus V = 103.9C aAT IC RA' 2C vf1_

j._ij 15/20/25 MVA 15/20/25 MVA LAAA h I8P

• 1.0 fw m

Tap = 1.0 ry, y,. i v n RAT 10 RAT 2D 4160 V Busses 1A & 18 t ._,1 j 4160 V Busses 2A & 28 'Y No Load "9 y = 108.12 (1) Top = 1.0 (I) ~ (T) Tap = 1.0 (1) 4160 V Bus IE V = 107.55 4160 V Bus 2C 41(0 V Bus 2E V = 106. 95 6 V = 106.95 4160/600 V O - ?;.l.';"- O O = 4160/600 V: '" - w .w 1.21 MVA M.0 .64 MVA 1.25 HVA a.89pf $.85pf 600 V Bus 1C V = 109.36 0.85pf 600 V Bus 2C 600-208/120V V = 109.43 Tf. 30KVA 600-208/120V WW I f. 45KVA /YYm Tap =.925 LA A W h8p h0p 4160 V_8us IF V = 107.31 4160 V Bus 1G V = 107.31 208V V= 108.28 208V V= 108.24 Reactor 81dg. Intake Str. MCC. 2C hM MCC - I A 4160/600 V LAA w 5.5. Trans. m m m ID 2.3KVA 4160 V Bus 2G _ 4160 V Bus 2F 41JO V

• us R B -

1.5 KVA Tap =1.0 ,,j 0.85 of 9.85pf 1.16 MVA V= 07.36 y.,107.36 y=107.36! m p.85pf 600 V Bus 10 V = 109.00 w a_A./4160/600 V m vm ff 600-208/120V w h "I Tap =1.0

• 4 H

.69 HVA .2$6 hVA N0_TfL mm

1. System voltage is in percent on 230 kV base.

.59 MVA Tap =.925 600 V 8us 2D 9.89pf 9.85pf 0.85pf V V= 09.53

2. Bus voltages are la percent on 4000 V and 550 V 208V V = 107.83 15 kVA base for the 4160 V and 600 V bus motors. respectively.

-fg,g'el81dg. Tap.'.925W'p W m 3. Taps are in per unit. HCC-1C V= 107.73 208V V =1108.42

4. Bus voltages are la percent on 200 V base

.52 HVA Intake Str. for 208 V bus motors. HCC - 28 8 '88PI

• 3, Data Tile: H101011 pg Sev. 2 Cate: 4/11/fl0

Figure 2 - ifatch Units 1 & 2 Station Auxiliary System - Offsite Source Case 1 2-- Vaalau:n syste m voltage and e' int v st. tion au.ma,, ioa co.aitio. Unit 1 under rc.fueI6ng un er n n'al m ation 23'h V V = 104 $p 0.042

• j0.937 3 230 kV Plant Bus V=

103.96 wJ. 4.w 15/20/25 MVA RAT 2C Tap = 1.0 Ur* t Wn 15/20/25 MVA w.t .A 1.a_f I M 4160 V Busses 14 6 Ig RAI ID R4T 20 9/1 /15 MVA 'M V = 108.12 9/12/15 MVA 9/12/15 MVA 9/12/15 MVA I "* I'8d Tap = 1.0 (Y) (y) m Tap = 1.0 4160 V Bus IC 4160 V Bus 11 4160 V 8us 2r y= 107.43 V = 106.75 V = 106.75

O' jg*f'885*

WW LAJ A.v 5 ns. m m g,m Tap = 1.0 1.17 MVA Tap = 1.0 3.60 21VA .90 ftVA 9.85pf 9.85pf 600 V Bus 1C D.90pf 600 V Bus 2C V = !!0.01 y = 108.50 M W 6 E 208/120V Tf. 3KVA g 20av .31 600-208/120V Intale str. 1.5 kVA T f. 45KVA u.( w .59 MVA 9 NCC - IA 9.85 pf Tap =.925 m m g8 46 .85pf 208V V* 108.85 .4160 V Bus 10 4160 V Bus If 4160 V Bus 1G Reactor 81dg. 4160 V Bus 2G V = 107.79 4160 V Sus 2F V = 107.79 MCC - 2C V = 107.30 V = 107.30 V = 107.30 w w 4160/600 y 2.3KVA 4160/600 V ww 9.85pf 5 5. Trans. .311 HVA 1.0 MVA

• m m h5. Trans.

9.85pf 9.89pf

• 25 MVA Q

600 V Bus ID 600 V Sus 20 V = 109.88 9.85pf 6QM V = 108.99 600-208/I20V T 15KVA w N0Tts: Tap = 925 208V V= 108.77

1. System voltage is in percent on 230 kV base.

208V V= 107.82 Intake Str. $9 gy, I 9*

2. Sus voltages are in percent on 4000 V and 550 V

$.85pf MCC - 28 .52 M A base for the 4160 V and 600 V bus motors, respectively. '1CC-1C 0.85pf 3. Taps are in per unit. .i KVA Data file: M2D20?2

4. Bus voltages are in percent on 20H V base Rev. 2 Date: 4/11/C0 for 200 V bus notors.

0-g R. ga e e a h. 5 E' A* >J d Eo

r. t 2f

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C

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• • GEE 48;

= "$,.22" r E Ur + " 5 5 = J6 3 3 I4(9 E s ~g ;;;* gj ~

• I 3

m m = > 60 7 2 +1 I21 *,l,% / e o 2* J ' x y E sk E. s = y y --3. ),h

• o s

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• g3 8 c, s u m. ue..

os- ~ lc:- s se c g

• EA

/ 9R.8 E. O 2 e -55m '\\ s ' ' -

• 4 u

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• w =

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1. 7 J C2n gi e

f C L s e e.g-s; J z.

• 75=

(

>e.

6 o h1 8: -; e,! = 3S= -u t-. C *t a g .c s i' % u 2 g.- g, o 2% n a l 4. L m~"* ..E ( E'S u'. St M c ~. g* *. j

• e i

2 '( .a4 mo m. 8 D N Wl'D h, ' '\\ ww w ,e

Figure 10 - Hatch Units 1 & 2 Station Auxiliary System - Offsite Source Ca,e 2,.i Mi,i.,,,,,,,,,,,, a ge e d.a, e station auntilary load condition. Unit I under LOCA tmit 2 under normal shutdown Unit I syste, shown in detall Loads based es the field rea' lags are d 55 h1 her than Case 2-1. 9 600V Bus IC V=96.33 600V Bus 10 V= 93.69 600W Bes If1 va 93.49 600-208/120V m m 45 kVA Ess. Tf.18 w w 8W M LA.A w 600-208/120V Tap =.925 - /120 V Tap *.925 mm mm 112.5 kVA gss, yg it rap. 925 w w 600-208/120V 45kVA Tap =.925 V= 95.27 600-208/120V Va 92.39 ~ 8P =.925 Va 94.22 Reactor 81dg. 5kyA V= 92.08 Reactor 81dg. MCC - IC MCC-18 ~ ) 600-208/120V 10 600-208/120V D 5'1 Bld9-600-208/120V *

• MM 600-208/120Vm m m

m 30 kVA 30kVA 19.3 KVA 456VA Tap =.925 5.3 KVA 45 kVA tap = *925 ,1*fgf,j 9.85pf Tap =.925 9.85pf Tap =.925 32.5 KVA 9.85pf V= 93.70 V. 94.68 V* 91.42 V=91.45 ( 10.5 KVA 8 85pf Diesel 81d9. Intake Str. Diesel Bldg. Intake Str. r MCC - IA MCC - 1A MCC - IC MCC - 18 II.5 KVA I 4 "IA 9.85 pf V. 90.26

v. 93.50 11.0 KVA

\\ V. 90.32 V= 90.23 O O ~ 4.3 KVA 9.85pf \\ j 8 84Pf O O Diesel Mtr. Plant Serv. Diesel Mtr. Plant Serv. Air Conp. Wtr. Stratner gir Co,p. Wtr. Stratner 3.0 KVA 3.0 KVA 3.0 KdA 3.0 KVA 9.85pf 9.85pf 9.85pf 9.85pf Data file: ItlCD5RR0 8ev. 2 Date: 4/11/80

• O N045' Sheet 2 of 2 1.

Sus and motor voltages are in percent on 550V and 208V l>ase for the 600V and 2007 bus loads, respectively.. 655D 5@ t===> c===, F

5 ' ii2 =a ~ ,0* r, ~~ 3 4 no i: 2

• t *
• O

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== g": 4 } .c. o, g gE

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• 4 a. g U 38.i..ai t.. N E

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• • sEs g

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• ]

r= = o O 2 a p 8' R~1 1 o w-4, a. .t t <a KR g a s 3e g o -t. k, g ca s 2 ee-O 2 .e a, =- c + * . = ~

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t a

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• i n e.

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• o m q

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• I E

g (a 3 3 ea (a o o. s ,,. o 1 s 2 *.o T C. . gI a a s : g *. P . m e+ j q 1.. s Sh O m ~ 3 n .~% mt - ~ " D' >t g- .-l mit m ( k kh2 S gg,,, e -} a me 1 J

Fiqure 11 - Hatch Units 1 & 2 Station Auxiliary System - Offsite Source Case 2A-1 Minimum system voltage and mealsua station avalitary load condition Unit 1 under LOCA Imit 2 under normal shutdom Imit 2 system stem la detall Lo'ds based on the field readings are a 51 higher than Case 2-1. 600 V Bus 2C V = 97.78 600 V Bus 20 V = 94.66 l Ess. If 28 E00-208/120 V 112.5 kb A W AA> W A.A> W AA> ww y Tap *.925m m ryy m .yy m 112'5kVAm m 600-480 V Ess. If. 2C Tap = *925 Tf. 112.5 kVA 600-208/120 V Tap * .925 112.5 kvA Tap =.925 V= 92.M V= 96.14 V= 92.5 Hyd. Recomb. V= 95.63 600-208/120 V if. 15 kv4 Hyd Recomb. 28 Bid. 2A 600-2M/120 V 600- m.=a w 9 if. 45 kV4 W W WW Tf.15 kVA W AA> LA.A w Ltg. & Misc. Tf w w 600-208/120 V mm Tap =.925 m m m m 600-208/120 V m mif. 45 kVA O' lap =.925 syv m Tap =.925 Tap =.925 v r;L4.f600-208/120 V 45 kVA 75 gyg 32.5 KVA 9.85pf f,*g5p 5 A Y= 95.47 V= V= 93.49 y= 92.25 V= 93.34 a

• 925 96.Q Diese) 81d9.

Intake Str. 75 KV4 Intake Str. Olesel Bldg. Reactor 81dg. MCC - 28 MCC - 2C MCC's MCC - 2A MCC - 2A V= 96.72 9.85pf Reactor Bldg. [T 0

• 0EI O

= 12.9 svA MCC's (/ V 94.07 V= 94.30 V* 93.02 V= 90.55 12.9 KVA V

• 93. M 3.6 KVA V=

95.41 0.85pf 9.85pf O O O O n Drain Wtr. Travel Wtr. U Dilution Serv. Wtr. Dry Chiller Pump Screen Dry Chiller Wtr. MOV MOV 2 KVA 1.6 WVA 1.6 EVA 9.85pf 1.6 kVA 3.8 FVA 2.0 EVA 9.87pf 9.87pf 9.87pr 9.85pf 9.85pf c3 mu Cata file: H2C6RRC 1. Bus anJ notor voltaws are in percent on 5507.4607 and Rev. 2 Date: 4/11/80 2G3V Lase for Lt.e m)V. 480V, and 20BV bus loads, respectively. 5 2M2 basy c= > 2EED r=== figure 12 - Itatch Units 1 & 2 Station Auxiliary System - Offsite Source cas,ra.2 a ul u system voita9e an4 m l. station aralllary load condition., thtt 2 under LOCA SII I*N tailt I under norwal shutdown Ihlt 1 system shoun in detall 0.12 + jl.491 . loads based on the field readings are 55 klgher than Case 2-2. 210 kV Plant Bus V"9I I6 RAI IC RAT 10 UJJw1JJJ tY s i "( s A15/20/25 W A 9/12/15 MVA 9/12/15 MVA thtt 2 load Tap = 1.0 O* m er m (I) T AP = 1.0 (V) tEert0CA 4160 Y Busses IA & IB 33.91 f!VA 20.2 5 0.85pf Be) GE% 4160 V pus IC V= %.08 C"::33 4160 V Bus 10 V = 92.75 Cll : 3 p ) 6.27 HVA 41(>0 V Bus 1[. { ~~

• V = 92. 75 f

8.85pf T 4 / Y 4160 V Bus IE V = 96.08 Y= 92.24 y= W JO V= 92.35 UJus 4160/600 V I 10

5. Trans.

Tap = 1.0 600Yl) Bus 10 U J A.A> V =,95.78 V= 95.59 V= 95.53 V= 95.59 Core Spray RatR Pit. Serv. Pump P..a p kt r. Pump -V = 93.69

• V=

%.08 err es3 - -( 1250 HP IM HP 7b0 HP .m, Tap = 1.0 Off ( I,, .9 MVA 4t3 HV4 = g,90 pr ,. gj t en A a,gj;pr ,9a pg 5 fire CRD Plt. Serv. RilR Core Spray 4160 V Bus IF V

• 92.75 600 V l Bus IC Pump Pump Wtr. Pump Pump Pump V =96.36 250 HP 250 HP 700 HP 1000 HP 1250 HP

,31 Hg4 .23 HVA.60 tVA .894 HVA.9 HVA 4160/601 V 4160/600 V 4160/t,60 V 9.85 pf 4.85pf 3.097pf 9.90 pf 9.90 pf 5.5. Irans. 5.5. Trans 5.5. Trans. ICD 11 2 Air wU> we uJ y; jjj fa,g, n q,n g,5,, V= 92.20 V= 92.32 V= 92.32 er,,3 n y)m sn Tap = 1.0 Tap = 1.0 . l?'atv A Tap = 1.0 g ) 4.85pf l V = [ 97.29 V = } 91.49 + V * {J (' / 97.29 RBCC Pump Of f Off .125 hp RHR Plt. Serv. Pit. Serv. .125 MVA 9.85 pf Pump ktr. Pump Wtr. Pump H FM HP 700 HP hoff5** .094 MVP. .51 HVA .51 #1VA 1. System valta9e is la percent on 210 kV tease. 0.90 pf a.897pf e.897pf 97 2U ,17 nya 2.. Bus an.1 motor volteres are in penent on 44f 4 V anil .V *" 2 550 V t.ese for ti e 4160 V av.J 600 V teus maters, respectively. 9.87pf Data file: HlffRPA 3. Taps are in per unit. 1000 ho Rev. 2 Date: 4/11/a0 + See steet 2 for 20av laajs Sheet I of ' .894 MVA

1 Figure 12 - Ilatch Units 1 & 2 Statioii AtTxiliary System - Offsite Source me24-2 ntni sfstem alta;e and mis.u. station auntitary IcaJ conattlom laitt 2 knJer LOCA tailt i under norwal shutJ0we thilt I system sho<1 la detall h ads based on the field readings are 51 higher tham Case 2-2. 600V Bus IC V= % 36 t.00V Bus ID V= 0.69 600f Lus lil V 93.49 W W w e.00-20a/120V Ess. If.18 tu w Mm tu w m m 45UA 600-208/120V Tap =.X 5 0-2 /120 V 112.5 6VA n ym I'P * *826 mm Tap =.925 Ess. Tf 1C isp *.925 w u,,600-208/120V V. 95,30 600-208/120V v. 92.39 45kVA mm V=i 94.24 Reactor Bldg. V. 92.08 Reactor Bldg. ~ MCC - IC MCC-18 9* MISC w..w WW jp " ' ' W A.A> w<w 600-200/120V 060b-208/120V mM MM ~ 600-208/120VMM m'm 30 kVA S,l 8Id9* j y 45 knA 45tVA Tap =.925 T'" Tap =.925 1.9 KVA Tap =.925 32.5 KV4 5.3 KVA e,aspr ,,g5pg 9.85pf V= 93.23 V. 94.70 Diesel 8149 Intake Str. h"IA V= 91.43 V = 91.45 g Diesel 81dg. Intake Str. MCC. IA HCC - 1A HCC

• IC MCC - 18 10.5 LVA 9.85pf V. 90.29 V* 93.53 V=

90.33 v= 90.23 11.5 KVA 4.3 KVA 11.0 KVA / 2.4 KV4 r 8.85 pf 9.85pf 9.85pf ( 0.85pf Diesel Mtr. Plant Serv. Diesel Mtr. Plant Serv. Air Ccep. Wtr. Strainer Air Comp. litr. Strainer 3.0 MVA 3.0 KVA 3.0 KV4 3.0 KV4 9.85pf 9.85pf 9.85pf 9.85pf h0TES: 1. Sus and motor voltages are in percent on 550V and h 208V base for the 600V and 208V bus loads, respectively. Data File: HIC 6RRA Rev. 2 Date: 4/11/80 M '5heet 2 of 2 @ED

w. e).

2Bo ti=== -ngure 13 - Ilatch Units i A 2 Station Auxiliary System - Offsite Source rase 23 2 3,tnlm.,sien.aita2e au si-a stitian ausillary lead condilloa p $ys V.90 Ontt 2 under LCCA tatt I under s.ory.sl shutdawn thjt 2 system she in detall 30.12ajl.49t I toads based on the f eeld reaJings are 55 higher than Case 2-2. 210 6 V Plant Bus V = 97.15 RAI 2C AAf 2D WaA s VA.J 15/20/25 11VA ., gg.g w unwA m_v 9/12/15 MIA Unit I load Under (s" 'O PFirsal Shutdown 4160 V Susses 2A 4 28 V

• 98.37 8P 5.3 4

9.31 MWA 9.85 pf 's OQ V = 95.13 4860 V Bus 2C 4160 V Bus 20 V

• 94.51 B e) 7.82 ftVA 4160 V Bus 2G V = 94.57 0.85 p f 8.

M C:::ll3 4160 V Sus 2E l V = 91.73 4 ' V= 94.57 V= 91.11 Y= 93.81 Y* 94.41 AAj 5 T n. 5 Tr n. wA .V* 95.17 V* 95.73 V* 95.30 Y* 95.0 5 V* 95.28 Drywell Core Spray RiiR Plt. Serv. Chiller Punp P.mp htr. Pus, -600 V-Bus 20 V a 94.65

• N8' 8~ O 600 HP 10(o tiP 1(.xl ti?

700 ItP Iap = 1.0 Off 9.90 pf 9.90 pf e.897 pf 34 UYA 600Y1) Bus 2C* [ V* 94.04 Orywell CRD Plt. Serv. RHR Core Spray 4160 V Bus 2F Va 98.57 Chiller Pump Wtr. Pump Pua.p Pump y, 97,7 7 600 HP 250 HP 700 HP 1000 HP 1000 HP f 4360/600V 4 360/f.CJV .35 MVA f .56 trdA .66 NVA .898 MVA .98WA 5.5. Trans. 5.5. Irans. 9.C6 pf ~~ 9.85 pf 9.897 pf 9 90 pf 9.90 pf V= 97.); 200 2f2 u).s>> UAav 98CC 11 MdA V= 93.87 V* 94.34 Va 94.42 (Y e t's i V* 94.34 .ss s Pu'9 0.83 pf - Tap

• 1.0 Tu
• 1.0l[v T 1]gg V * [)99.20 V = l)97.65 RSCC 9.85 pf Pug 150 lip

.15 f:'tA .894 ttVA RiiR Pit. Serv. (ItD Off Pit. Serv. 9.85 pf 9.90 pf Pump Wtr. Pump Pump kf r. Pump 1000llP 100 HP 250 HP 700 Hi* ,\\ f h_03 5 y. .34 tr/A 321 tivA . 3 4 ft.' A 1. System volta 9e is in percent on 230 kV base. 93 3 9.891 pf 9.615 pf 9.891 pf o 2. 8 ss aral motor voltages are in percent on 4000 V armt j 5 550 V I,ase for the 4160 V 4:ws 600 V tus m, tars, resrectively. L Taps are in per unit. RHit Data file: H2f W 2

• 5ee sheet 2 for 208V loads pn. 2 4/ H/M hp p

Figure 13 - Hatch Units 1 & 2 ~ Station Auxiliary System - Offsite Source Case 2A-2 Mintsus systen voltage and maalma statten availlary load candition Lhlt 2 under LOCA unit l'under normal shutdown indt 2 system shown in detall Loads based on the field readings are 65 bigher thea Case 2-2. '600 V Bus 2C V = 97.77 600 V Bus 20 V = 94.65 Ess. If 600-208/120 V h $0 V" ^"^# 112.5 kh4 W AA> W A.A> w AA> Top e.925/vY m mm mrm m gm m Ess.if.2ClV Tap = *925 600-480 V 600-208/120 Tf. 112.5 kvA Tap = .925 112.5 kVA isp =.925 V= 92.88 V. 96.13 V= 12.49 Myd. Recomb. V= 95.62 600-208/120 V U. 15 kVA .R = 600-208/120 V 600-208/120 V Tf. 45 kVA W A.A> WW if.15 kVA W AA> W 'A > Lt9. 4 Misc. Tf w Aas 600-208/120 V mm isp =.925 m m m m 600-208/120 V mmif. 45 kVA O isp =.925 m m Tap =.925 w ra,j 600-208/120 V 45 kVA isp =.925 y5 A if. 45kVA 32.5 KVA Tap =.925 mm g* Py ,32"5 KVA Intake str. Olesel 81dg. Reactor 81dg. V= 95.47 V= 96.18 Tap =.925 9.85pf V= 93.48 y= 92.24 V. 93.33 gg g p Diesel Bldg. Intake Str. MCC - 2A MCC - 2A V= 96.72 75 KVA MCC - 28 MCC - 2C MCC's o ut-d9 o om 12.9 KV4 V= 94.06 V= 94.29 V= 93.01 V= 90.54 17,9 g..g V= 91.97 0.85pf V= 95.41 0.85pf O O O O O n Drain Wtr. Travel Wtr. U Dilution Serv. Wtr. Dry Chiller pump Screen Dry Chiller Wtr. NOV MOV 2 KVA 1.6 KVA 1.6 KVA 0.85pf 1.6 KVA 3.8 KVA 2.0 KVA 9.87pf 9.85pf 9.87pf 9.85H 9.85pf h0Tts: R aftle: 05 h 9 1. Bus and motor voltages are in percent on 550V.460V and g*, / Il 208V base for the 600V, 48:7t. and 208V bus loads, respectively. g Sheet 2 of 2 q=3

E?e)

Eso b

Figure 14 - Hatch Units 1 & 2 Station Auxiliary System - Offsite Source Cas, 3A Ntor 5tiretag enter strin.3 syste. oitasi.nd maqn.n le condition 230kV Unit I under LOCA SV5 IV *98 Unit 2 under normal shutdo.s tintt I system shown in detall'for stealtaneous starting of two core spray pumps. four BMR puw95. and . 0.12 + J1.49 3 one condensate pump on RAI 10. Loads based on the field reedtags are 230 it.flatL.5!J5 V = 96.56 51 higher than Case 3. RAT-lC 15/20/25 MVA N' M iAP=1.0 Unit 2 toad UhJer t4orma1 Shutdown 44.27 MVA 9.86pf 110 V BU55F51 A & 18 V = 97.5 RAT ID 9/l?/15MVA v_ ^ ^ ^> vm 9/12/15 MVA yy ym (x) TAP = 1.0 III ' 9.93 f tVA 0.85 pf 4160V Busses IC & IE V = 89.06 4160V Busses ID IF &. IG V = 77.12 4160-600V u.a w Tf.ID ry v ml400 kVA Tap = 1.0 7.43 MVA 11.05 MVA 9.86pf V= 87.29 V= 87.45 0.8 pf V* 75.71 V= 75.71 ~ ~ -76.37 V= V= 75.71 V= 75.58 600V SUS ID V = 75.19 f ( 600-208V l Core Spray Pump RHR Pump Condensate Core Spray Pump m m 4$ gya u A Wif. IF 1250 hp 1000hp 3 - RilR Pumps pune 1250 hp M Tap =.925 Each 1000 hp 1500 hp m 150 XVA 470.43 rVA 9.85 pf 9.44 pf (MOV Loads) 20BV V=72.64 M Diesei Bldg. MCC-IC ta0TES: P l. System voltage is in percent on 230 kV base. 11.63 EVA 2. Sus voltages are in percent of 4000 V and 550 V e.85 pf base for the 4160 V and 600 V bus motors. respectively. ag,ca p, 2.93 KVA 3. Taps are in per unit.

4. Sus voltages are f a percent en 200 t base.

,,,,,g g,, nicpg for 200 V tus meters. Dates 11/16179 Rev. 2 4/11/60

Appendix D Field Readings Recorded on I March 28, 1980 and April 3, 1980 at Plant Hatch Units 1 & 2 Rev. 2

Hatch Units 1 & 2 Station Auxiliary Load Readinas 208 V Systems y"j.). g l ' ate: 3-2_8-80 us or Feeder flame Amperes Volts I I I I Y Y Y l 2 3 ti 1-2 2-3 3-1 ,+4.e structure /ACC IA 24.6 20.7 /4,4 All 213 2 11 iesel Glch. /ML lA 47,6 56,5 S65 /9,4 /92 002 /98 O v for l?l<l. MCe Ic 1.b //. 2 3.4 9.D 200 o'7Q3 20/ 3 orttrol Blc]c, Mr.s s to 36 1,9 4l3 2c0 202 '900 v ':ed BIk, 1/cc 16 35,7 23,4 .28.I 20,2 Dc6 209 206 ssenticJ xfan os sq qq.s 93.s Dig' 2 19 118 ~ b NC &r.rdure'IKLI(b D9. 4 42,I 21,2. 23,]

oI 202

.20 0 r deici EMa. MCL le 52,1 49,9 21,0 24,3 A2 20) fc79 ssenkI XFMR IC 423 39.4 43,4 24.S 22O 221 .22 i

• cefor Etele AICC ib' 22.2

/2,4 10 L., 9, 2. Dot 203 2x v-mbvI Olde. 111CC IC 2.59 /,66 D.55- .2.75 203 A02 .202 L+te<y CF3'he,, en (#2 V Bas t 3 25 A bt 151 203 199 DoD h 5

.,.. e. Hatch Units 1 & 2 Station Auxiliary Load Readings i , ate: 4 '5-80 us or Feeder flame Amperes Vol ts I I I I Y Y Y l 2 3 N l-2 2-3 3-1 1A MV h -Nden houb O. I 1.7 1.2 0.1 +73 476 472.5 16 'ov Ss - 4 dro hb o.os I.92. IAI o.or 479 432. 430 f 33 V #ce 1A LLt Gu.) 1.1

11. 0 BD

.40'1 209 406 M Mce28 %+.sd 49 o.1 g.2 4.1 209 Soe 207 G e e

• e e

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