ML20138J087
| ML20138J087 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/05/1997 |
| From: | Rainsberry J SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9705080015 | |
| Download: ML20138J087 (31) | |
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E' M)VIHUIN CAllfDRhl4 C " ""*m EDISO.N luuuger, Pixa I..iwratng i
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,. c ll May 5, 1997 i 1
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'J. S. Nuclear Regulatory Comission '
L Attention: Document Control Desk i
" Washington, D. C. 20555_ !
i I Gentlemen: '
k
Subject:
- DocketNos.50-367and50-352 !
- Additional Information for Amendment Applications 167 and 153 !
- San Onofre Nuclear Generatirig Station, Units 2 and 3 !
a l Provided as an enclosure to this letter is additiolai information in support j of Amendments 167 and 153, which were submitted on April 15, 1997. This
- -inforraation responds to' the request from the NRC dated April 29, 1997. j i
If you have any questions on this information, Please let me know i l
Very Traly Yours,
.- I s
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% i Enclosure ' OC) ' f cci E. W..Merschoff, Regional Administrator, NRC Region IV-K, E. Perkins, Jr., Director, Walnut Creek Field Office, NRC Reginn IV J.,'A.'Sloan, NRC Senior Resident Inspector, Ssn Onofre Units 2 & 3
- M. B. Fields, NRC Project Manager,. San Onofre Units 2 and 'i ,
I 97 5080013 970505 D ADOCK0500g1 San Onbfre Nudear Generating Station .
P.O.Dosi28 * * * ' '**
San Oknwtee, CA 92674-0128 71446M 420 t )
_ . . _ _ _ _ . _ . - - . . ~ . _ . . _ _ . __ _ _ . _..... _...___-_ _ . _ _ . . _ . _ _ _ . _ _ . ~ _
L Question 1: 1Fhat is the surwillance frequency ofibe reseny arailimy tramprmers (RA Ts) and unit arciliary trcnsformers (UA Ts) and .
when were the last surveilkmcasperformed on these transformers? I Response I:
gXfmr Visual Inspection. Oil / Gas S.cnoling Cleaning /InsicVion Omhaul CB Inspection. Rel A Metering l Prot.Retsys PM i W a l ks m _
rreq ' Iest Freq. lest F eq im Freq Iast Fret; I Last Freq. !Last Fw , Last l Surv. Surv. Surv. Stre. Sury Sury. Surv. !
tj .I S2XVI IQ 9S6 6M 2/97 1R 2/97 4R IS7 3R 6S3 2R 365 1R 3S7 li 2XRI 1Q 9S6 6M 2/97 1R 12 S 6 4R 1/97 3R 6S3 2R 2/95 IR 387 2XR2 iQ 12 S 6 6M 2S7 1R 12/96 4R IS7 3R 683 2R 4SS 1R ! 3/97 j 3XUI I IQ 4S7 6M 11/96 1R 11/93 4R 2S7 3R 10/93 2R 9/95 IR 985 !
3XR1 IQ 4/97 6M i:S6 1R 10 S 3 4R 2/87 3R 10/93 2R 10/93 1R 9/95
. 3XR2 IQ 4/97 6M 11/96 IR 10 S 3 4R 247 _ - ,
3R 10S3 2R 10M3 : 1R 9/95
- 1. Visual Inspection "iQ" Quarterly ;
- 2. Oil / Gas Sample "6M" every 6 months
- 3. Clean / Inspect'on "lR" every refueling outage
- 4. Overhaul"4R" every 4th refueling outage ,
- 5. Circuit Breaker Inspection "3R" every 3rd refueling outage ,
- 6. Metering "2R" every 2nd refueling outage
- 7. Protectier Relay Walkdown "IR" every refu::!ing ouage i
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. Question 2: Provide the specificationsfor the JM Ts and UA Ts, inc/uding their impedanccx I
i Response 2: i a 1
- Reserve Auxiliary Tramformers (XM1 & XR2) !
!. I MVA @ 55C: H-winding 30/40 MVA, OA/FOA l X-winding 10/133 MVA, OA/FOA l
l Y-win. ding 20/26.7 MVA, OA/FOA l 4
1- Voltage: 230-436/4.36 kV f Impedance (Z) @ 30 MVA:
l l i Unit 2 (XRI) Unit 2(XR2) l
! Z H-X = 14.1% Z H-X = 14.1% !
- Z H-Y = 11.25% Z H-Y = 11.25% l Z X-Y = 25.2% Z X-Y = 25.2% l 4
j' Unit 3 (XRL) Unit 3 G@2j Z H-X = 14.4% Z H-X = 13.8% ;
}- Z H-Y = 11.1% Z H-Y = 10.95% i 7 X-Y = 24.6% Z X-Y = 25.8% !
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Unit Auxil:ary Transformers (XUl.) ;
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- MVA @ SSC
- H-winding 30/40/50 MVA, O A/FOA/FOA X-winding 15/20/25 MVA, OA/FOA/FOA i Y-winding 15/20/25 MVA, OA/FOA/FOA l l
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! Voltage: 22-4.36/4.36 kV i
Impedance (Z) @ 30 MVA:
j Unit 2 (2XUI) !
j Z H-X = 12.2%
Z H-Y = 12.2%
Z X-Y = 24.0% ,
Unit 3 (3XU1)
Z H-X = 12.2%
Z H-Y = 12.2%
Z X-Y = 24.0%
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- Questions 3 and 6
l l Background for Questions 3 and 6: !
j' In modes I through 4, the normal preferred power source for each SONGS unit is the Reserve I
. Auxiliary Transformers (RAT) XRI and XR2 for the specific unit. XR1 feeds one 4.16 kV Class IE !
- bus (Train A) A04 and XR2 feeds the other 4.16 kV Class IE bus (Train B) A06 of the onsite i j Class IE AC distribution system for each unit. This source is classified as the immediate access
- preferred power source per General Design Criterion (GDC) 17. The alternate preferred power !
{ source is the other unit's RATS XR1 and XR2, or the other unit's Unit Auxiliary Transformer (UAT) J
- XUI via the train oriented 4.16 kV Class 1E bes crossties between the two units. This source is i i classified as the delayed access preferred power source per GDC 17. The 4.16 kV Class IE bus !
! alignment in the other unit determines which transformer (s) serves as the alternate preferred power j i
source. If the 4.16 kV Class 1E bus in the other unit is aligned to the RAT (XR1 or XR2), then that i j transformer is the required alternate preferred power source. Ifthe 4.16 kV Class 1E bus in the other !
j unit is aligned to the UAT (XUl), then that transformer is the required alternate prefened power )
i source. !
l In modes 5 and 6, when the main generator is not operating, each Class IE Switchgear can be I connected to a third preferred power source via the UAT by manually remcving the links in the isolated phase bus between the main generator and the main transfbrmer of the non-operating (modes ,
i 5 and 6) Unit and racking-in the 4.16 kV circuit breaker into the fully equipped cubicle connected to )
l the UAT of the same Unit. In this alignment, the UAT (XUl) serves as the normal preferred power
{
j source of the shutdown unit and the attemate preferred power source for the Class IE buses in the J l other unit. !
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Background for Questions 3 and 6: (continued) ;
I Refer to Attachments 4-1,4-2 and 4-3 for diagrams of the various alignments.
Attachment 4-1 shows the normal alignment for the Class lE buses in Unit 2. Unit 2 Class lE bus ;
2A04 is fed from the X winding of 2XRI. Unit 2 Class IE bus 2A06 is fed from the X-winding of- .
2XR2. ,
i Attachment 4-2 shows the alignment in which the Unit 2 Class IE buses are fed from the Unit 3 RATS via the 4.16 kV crosstie. Unit 2 Class 1E bus 2AO1 is fed from the X-winding of 3XRI. i
' Unit 2 Class 1E bus 2A06 is fed from the X-winding of 3XR2. l l
Attachment 4-3 shows the alignment in which the Unit 2 Class IE buses are fed from the Unit 3 UAT l' via the 4.16 kV crosstic. Unit '2 Class IE bus 2A04 is fed from the Y-winding of 3XUl. Unit 2
,. Class IE bus 2A06 is fed from the .X-winding of 3XUl. This alignment will only occur under the i following conditions: l
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- 1) Unit 3 is in an outage and the Unit 3 Class IE buses are fed from the Unit 3 UAT (referred to i as backfeeding); AND l l
{ 2a) Unit 2 experiences a loss ofvoltage or sustained degraded voltage (LOVS or SDVS) condition. .
. LOVS or SDVS will transfer the Unit 2 Class IE buses to the Unit 3 UAT via the 4.16 kV I crossties; OR 1
2b) Manual operator action. This would cccur only if Unit 2 RATS are not available (i.e., Loss of M Offsite power condition in Unit 2), and the Unit 2 Class IE buses are connected to their
- respective EDGs If the Unit 3 offsite power supply is available, the Operator may transfer the
. Unit 2 Class 1E buses from their respective EDGs to the Unit 3 UAT via the 4.16 kV crosstie.
Note that since the 4.16 kV crosstic is a delayed access power source, the Unit 3 RATS and UAT are not credited for ESF load m;uencing (SI AS)in Unit 2. The Unit 2 buses do not automatically transfer to the ' Unit 3 UAT under SIAS-LOVS. Under SlAS-LOVS the Unit 2 Class lE buses
- i. transfer directly to their respective EDGs.
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} Question 3a: Is a UA Tcapable ofsupporting the LOCA loads ofone Unit and the safe shutdown
- loads of other Unit?
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, that the Unit 3 UAT is capable of supporting LOCA loads on Unit 2 Class lE buses and spurious LOCA loads (i.e. spurious SIAS) on the Unit 3 Class lE buses. (Note: for Unit 3 Class IE bus ;
loading, spurious SIAS loads exceed safe shutdown loads, and are therefore conservative.) Refer to i the response to Question 6 for a discussion of the adequacy of voltage in this alignment. l l I i Question 36: What tests u ere performed to demonstrate this capability? )
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, Response 3b: Analytical techniques and assumptions used in the electrical calculations have been j
] verified against actual test measurements. He results of the computer programs foi dynamic voltage simulations (PSS/E) and steady sine voltage simulations (BECAP) were compared to the i
- preoperational transformer tap venrication test data gathered in 1981. In both programs the l 4
switchyard voltage and bus loading were modeled to match the test conditions. The calculated
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voltages were compared to those measured during the preoperational tests. Both programs (dynamic voltage and steady state voltage) resulted in voltages that were conservative when compared to the l measured voltages and within the acceptance criteria provided in Branch Technical Position PSB-1, Section 4. The results of this comparison validate the analytical techniques and assumptions used in !
the electrical calculations.
Results of the software modeling verification were provided to the NRC by letter dated Januany 18, i 1995, Additional Information for Amendment Applications 136 and 120 Degraded Grid Voltage
] Protection, SONGS Units 2 and 3. This infomiation was provided in support of PCN 429. PCN 429 2
revised the SONGS Technical Specifications to reflect a modification of the Class lE bus undervoltage protection scheme. This modification provided an enhanced degraded voltage 3
protection scheme (second level of undervoltage protection). -
l Question 6: Discuss the adequacy ofwitage andfrequency at the load terminal when the UA T will \
be usedas the seconds <mrce ofoffsite powerfor the opposite Unit. j Response 6: When the Class 1E buses are aligned to the UAT of the opposite unit, adequate voltage ,
- at safety-related load tmninals is ensured by the degraded voltage protection scheme. The degraded j voltage setpoints were selected to ensure acceptable bus voltages are maintained at all voltage levels in the Class lE system during r.ll modes of plant operation and during accident conditions. The degraded voltage protection scheme will transfer the Class 1E buses to their respective EDGs when the switchyard voltage is at or below the design basis minimum of 218 kV and the Class 1 E buses are aligned to their immediate access preferred power source (i.e. the RATS of the same unit). The voltage analyses demonstrate that the degraded voltage setpoints will not actuate when the switchyard voltage is within the normal range of 230-232 kV, and the Class lE buses are aligned to
, their delayed access preferred power source (i.e. the RATS or UAT of the opposite unit).
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Response 6: (continued) )
i Since the U3 UAT is a delayed access preferred power source for the U2 Class 1E buses, it is not credited as a power supply to the Unit 2 Class IE buses under SIAS-LOVS conditions in Unit 2.
Under SIAS-LOVS conditions the Unit 2 Class 1E buscs will transfer to their respective EDGs. The 4.16 kV crosstie automatic transfer logic is blocked by SIAS. In the original plant design both offsite circuits for a given unit (that unit's RATS and the companion unit's RATS and UAT via the crosstip) l were credited as lininediate access circuits for LOCA mitigation per GDC-17. Implementation of )
the degraded voltage modification in 1995 converted the alternate preferred power supply from an l irnrnediate access circuit to a delayed access circuit.
The voltage analyses (Change Notice C-7 to Calculation E4C-082 Revision 1; Change Notice C-7 j to Calculation E4C-090 Revision 1; Change Notice C-1 to Calculation E4C-098 Revision 0) that provide the basis for the degraded voltage setpoints were provided to the NRC by letter dated January 18,1995, AdditionalInformation for Amendment Applications 136 and 120 Degraded Grid Voltage Protection, SONGS Units 2 and 3. This information was provided in support of PCN 429. I PCN 429 revised the SONGS Technical Specifications to reflect a modificaion of the Class IE bus i undervoltage protection scheme. This mod 3 cation provided an enhanced degraded voltage protection scheme (second level of undervoltage protection) per Branch Technical Position PSB-1.
The NRC's review of the proposed modification, the new degraded vohage setpoints, and the ;
conversion of the alternate preferred power supply from an irnmediate access circuit to a delayed I access circuit are documented in the Safety Evaluation Report (SER) for PCN 429. This SER was transmitted to SCE by letter dated March 17,1995, Issuance of Amendment for San Onofre Nuclear Generating Station, Unit No. 2 (TAC No. M87830) and Unit No. 3 (TAC No. M87831).
The frequency at the load terminals is the same as the ofTsite power system frequency. The nominal system frequency is 60 Hz.
Question 4: Provide drweings showing the connection to the opposite unit 's RA Tand UA T Response 4: See Attachments 4-1,4-2, and 4-3. In the attachments, each of the three preferred power source alignments are shown foi Unit 2. For Unit 3 the alignments are similar.
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Question 5: Describe the protection arul ordinatimiprocess uhen the UA Twill be used as the .
secondsource ofoffsite powerfor the opposite unit.
L Ilesponse 5: Adequate protection for bus incoming breakers frem UAT and . RAT and bus tie !
breakers is provided. Protective relays and relay settings for bus incoming breakers are selected to i protect UAT and RAT from phase overcurrent and ground overcurrent. Protective relays and relay settings for bus tie breakers are selected to coordinate with upstream bus incoming breakers and l downstream load feeder breakers. ' Under a fault condition on the con.panion unit's Class 1E bus, the tie breaker will isolate the faulted bus from the system.
l See Figures 8.12.10,11,12,13, & 14 (Attachments 5 1, 5 2, 5-3, 5-4, and 5-5) for coordination j curves The figures show relay coordination when Unit 2 UAT or Unit 2 RAT is the second source i of offsite power for Unit 3 Class IE buses. There relay coordination curves are also applicable to i Unit 3 when the Unit 3 UAT or Unit 3 RAT is the second source ofoffcite power for ' Unit 2 Class 1E
- buses.
i Relay settings are provided on the following page. l 3
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Response 5: (continued) l Protective relays and relay settings for bus incoming breakers and bus tie breakers are as follows (from calculation E4C-098, Revision 1):
Bus incomine breakers 2(3)A0419 & 2(3)A0616 from UAT 2(3)XUl:
Phase O/C protection - Westinghouse CO-8 relay (Attachments 5-1 & 5-3) 7 A tap (4200 A primary), TD # 3.7 Set at approximate 200% of 2(3)XUl-X winding (or Y winding)
OA rating (15 MVA).
Ground O/C protection - Wer,tinghouse CO-11 relay (Attachment 5-5) 0.3 A tap (180 A primary), TD # 5.9 Set at i8% of the maximum available ground overcurrent (0/C) of 1000 A.
Bus incomine breakers 2(3)A0418 from RAT 2(3)XR1 and 2(3)A0618 from RAT 2(3)XR2:
Phase O/C protection - Westinghouse CO-8 relay (Attachments 5-1 & 5-2) 7 A tap (4200 A primary), TD # 3.3 Set at 317% of 2(3)XRl-X winding or 2(3)XR2-X winding OA rating (10 MV A).
Ground O/C protection - Westinghouse CO-11 relay l (Attachment 5 4) 0.3 A tap (180 A primary), TD # 5.9 Set at 18% of the maximum available ground O/C of 1000 A.
pus lie breakers 2A0417,2A0619,3 A0416, & 3.A0603:
Phase O/C protection - Westinghouse CO 8 relay 4
(Attachments 5-1,5-2, & 5-3) 10 A tap (2400 A primary), TD # 2 2 Set at 130% of 2(3)XUl-X winding (or Y winding) OA iating (15 MVA).
Ground O/C protection - ' Westinghouse CO-11 relay i (Attachments 5-4 & 5-5) 0.5 A tap (120 A primary), TD # 7 Set at 12% of the max. available ground O/C of 1000 A.
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W Question 7: Discuss the ccxitrolpower amilabilityfor the required breakers when the UA Twill be used as the second source ofofpite powerfor the opposite unit.
1 i Response 7: The breakers which are credited as being operable in each train (for the Unit 3 UAT ;
supplying the Unit 2 Class IE buses) are the Unit 3 UAT breaker, the Unit 3 crosstie breaker, and the Unit 2 crosstie breaker. The DC control power for operation of these breakers is supplied from their respective DC sources. No DC power crossties are provided between the units.
j In order to declare the AC sources operable, the DC control power to the associated breakers must
. be operable. For an operating unit, the requirements of LCO 3.8.9 must be met for the DC sources.
For a non-operating unit, the requirements of LCO 3.8.10 must be met for the DC sources _
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Question 8: Provide the details of the overlapping tests referred to in the amendment application j submittal.
Response 8:
SR 3.8.1.8 is revised to allow overlap testing of the transfer capability from the normal preferred power source to each of the two alterr. ate preferred power sources.
i The bus transfer test for a given unit is performed when that unit is in modes 5 or 6. Each Class lE l bus in the shutdown unit will be transferred from its normal preferred (offsite) power source to its )
alternate preferred (offsite) power source via the 4.16 kV crosstie. Since there au two possible sources of power in the opposite unit (the RATS or the UAT), transfer capability to both sources needs to be tested. Complete verification of the capability to transfer to both alternate sources may ;
be achieved by performir.g a manual transfer and automatic transfer to one of the alternate sources ;
via the crosstie. A functional test may be performed on the control circuit devices that allow a l transfer to the other alternate source. This overlap testing provides complete verification of the transfer capability to both alternate sources.
The overall test performed for one Class IE bus in Unit 2 is described below:
A. Test Condition: Unit 2 in an outage (modes 5 or 6) and Unit 3 in any mode.
l A manual and automatic transfer of the Unit 2 Class lE bus to the Unit 3 Class IE bus via the ;
crosstie is performed. This transfer test verifies that the crosstie is operable for both manual and I automatic transfers to one of the Unit 3 alternate sources.
During the transfer the two tie breakers (one at each end of the 4.16 kV crosstie) close in sequence. The tie breaker at the Class IE bus supplying power (Unit 3) is closed first and the tie breaker at the Class lE bus receiving power (Unit 2) is closed second.
The manual transfer test is performed by placing the crosstie transfer logic in manual mode, synchronizing the Unit 2 and 3 buses, closing the Unit 3 crosstie breaker, closing the Unit 2 l crosstie breaker, then tripping the Unit 2 normal source breaker. The last two steps are j performed in rapid succession to minimize the time that the Unit 2 and Unit 3 transformers are !
paralleled. After the manual transfer test is complete the Unit 2 bus is transferred back to the Unit 2 transformer to restore the pre-test alignment..
An automatic tnaisfer of the same bus is performed next. The crosstie transfer logic is placed in the automatic mode and the Emergency Diesel Generator is placed in maintenance lockout (to avoid a fast start of the EDG). The breaker supplying power to the Unit 2 bus is manually tripped. This creates a loss of voltage (LOVS) condition and causes an automatic transfer of the Unit 2 bus to the Unit 3 transformer via the 4.16 kV crosstic.
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, 1 Response 8: (continued)
B. Test Conditions: Unit 3 in an outage (modes 5 or 6) and Unit 2 in any mode.
A circuit test is performed on that portion of the circuit which permits the Unit 3 crosstie breaker to close with its Class IE bus aligned to the second (untested) alternate power source. For this portion of the surveillance, only the pennissive contact (152a) from the second alternate source's trcnsformer feeder breaker needs to be tested. This test is performed as follows (refer to the circuit sketch in Attachment 8-1)-
l The second alternate power source breaker in Unit 3 is racked in and closed, the breaker from )
the previously tested source is opened, and wire #C71 is tested for positive voltage at the tenninal block in the Unit 3 crosstie breaker compartment.
l Thus, the capability to transfer to the two alternate sources is tested by performing A and B above.
The testing methods apply to both trains of Units 2. The same method and conditions are duplicated l for Unit 3. I l
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Question 9: Discuss the impact ofshort circuit current on circuit breakers when the UA Tis the second source of offsite powerfor the opposite im!!
Response 9: Calculation E4C-092, Revision > ? 'monstrates that maximum interrupting ar.d ;
momentary short circuit currents when the UAT is the second source of offsite power for the ,
{ opposite unit are within the rated interrupting and momentary ratings of the circuit breakers. The i short circuit studies conservatively consider maximum motor loads running on the Class lE buses, i
and a maximum switchyard voltage of 238 kV. (Refer to Attachments 9-1 and 9-2.) -
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. Maximum available short circuit current at Class 1E buses:
i Interrupting Current E4C-092 i
1E Bus Calculated Breaker Ratine Case No.
1 l 2A04: 34461 A 45741 A C8AT5 l
- 2A06
- 34273 A 45542 A C7AT5 3A04: 34461 A 45741 A C8AT5 l 3A06: 34273 A 45542 A C7AT5 1
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! Momentary Current E4C-092 1E Bus Calculated Breaker Ratine Case No.
2A04: 62594 A 80000 A C8AT5 2
2A06: 61916 A 80000 A C7AT5 3A04: 62594 A 80000 A C8AT5
} 3A06: 61916 A 80000 A C7ATS ,
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3 Question 10: Venfy that the UA Tfor 4160V bus A06 is XUI.
- Response 10
- Yes; both Class IE buses A04 and A% may be fed from XUI as shown in the
Figure 3.2-17 in the IPE submittal contains a typographical error. The alternate supplies to 4.16 kV Bus A06 from the opposite unit should be XR2 and XUl, instead of XR2 and XU2 (Attachment
] 10-2).
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- Question 11
- Discuss the possibility of connecting the X-winding ofXRI and Y-winding ofXUI f to 4160 Vbus A04.
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, Response II: Class IE bus A04 may be connected to only the X-winding of XR1 or the Y-winding j of XUl. Similarly, Class IE bus A06 may be connected to only the X-winding of XR2 or the j X-winding of XUI (see attachment 10-1). During bus transfers the windings of two transformers j may be momentarily connected (paralleled).
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1 REFERENCES
- 1. Calculation E4C-082 Revision 1, System Dynamic Voltages During Design Basis Accident
- 2. Calculation E4C-090 Revision 1, Auxiliary System Voltage Regulation
- 3. Calculation E4C-092 Revision 1, Short Circuit Studies 1
- 5. Drawing 32216, Elementary Diagram Elec. Aux. 4.16 kV Bus 3A04 Tie Breaker (2A04), l Attachment 8-2.
- 6. UFSAR Revision 12, Figure 8.3-1, One Line Diagram - Main Auxiliary Power System i
- 7. Change Notice C-7 to Calculation E4C-082 Revision 1, System Dynarnic Voltages During Design Basis Accident i
I
- 8. Change Notice C-7 to Calculation E4C-090 Revision 1, Auxiliary System Voltage Regulation
- 9. Change Notice C-1 to Calculation E4C-098 Revision 0,4.16 kV Switchgear Protective Relay Setting Calculation I
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b ATTACHMENT 4-1 UNIT 2 ESF BUS 2A04 FED FROM NORMAL SOURCE (UNIT 2 RES AUX XFMR 2XR1) ,
UNIT 2 ESF BUS 2A06 FED FROM NORMAL SOURCE (Ui41T 2 RES AUX XFMR 2XR2) e TO SWYD TO SWYD TO SWYD 10SWYD MAN XFMR
_- MAN XFMR UN:T AUX XFMR RES AUX XFMR RES AUX XFMR RES AUX XFMR RES AUX XFMR UNIT AUX XFMR 2XU1 2XR1 2XR2 3XR2 3XR1 WM NM WM MM 3XU1 XM M Y XAA MAW MN '
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ATTACHMENT 4-2 UNIT 2 ESF BUS 2A04 FED FROM ALTERNATE SOURCE (UNIT 3 RES AUX XFMR 3XR1) .
UNIT 2 ESF BUS 2A06 FED FROM ALTERNATE SOURCE (UNIT 3 RES AUX XFMR 3XR2)
TO SWYD TO SWYD TO SWYD TO SWYD MAIN XFMR MAIN XFMH M- M-UNIT AUXXFMR RES AUX XFMR RES AUX XFMR 2XU1 RES AUX XTMR RES AUX XFMR UNIT AUX XTMR 2XR1 2XR2 3XR2 3XR1 3XUt WM M MM M W/
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UNIT 2 ESF BUS 2A06 FED FROM ALTERNATE SOURCE (UNIT 3 UNIT AUX XFMR 3XU1)
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