Text

NUREG-0847 Supplemental Safety Evaluation Report (Sser) Related to the Operation of Watts Bar Nuclear Plant, Unit 2, Appendix Hh Open Item 30 - Power System Degraded Voltage
	ML12160A350
Person / Time
Site:	Watts Bar
Issue date:	06/07/2012
From:	Hruby R; Tennessee Valley Authority
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	NUREG-0847
	Download: ML12160A350 (48)
	v • d • e

¶ Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 June 7, 2012 10 CFR 50.34(b)

U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Watts Bar Nuclear Plant Unit 2 Docket No. 50-391

Subject:

Watts Bar Nuclear Plant (WBN) Unit 2 - NUREG-0847 Supplemental Safety Evaluation Report (SSER) Related to the Operation of Watts Bar Nuclear Plant, Unit 2, Appendix HH Open Item 30 - Power System Degraded Voltage

References:

1. TVA letter to NRC dated August 12, 2011, "Watts Bar Nuclear Plant (WBN) Unit 2 - Safety Evaluation Report Supplement 22 (SSER22) -

Response to NRC Required Action Item"

2. NRC Regulatory Issue Summary (RIS) 2011-12, Revision 1, "Adequacy of Station Electrical Distribution System Voltages" The purpose of this letter is to update the information provided in Reference 1 related to the offsite and onsite power system degraded voltage studies for safety-related electrical equipment. The enclosed information provides a study that shows the impact of using a methodology that meets the intent of the guidance provided in Reference 2. The information provided in the enclosure and associated attachments demonstrates that the plant design conforms to the applicable regulatory requirements.

There are no new regulatory commitments contained in this letter. If you have any questions, please contact Gordon Arent at (423) 365-2004.

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4 U.S. Nuclear Regulatory Commission Page 2 June 7, 2012 I declare under penalty of perjury that the foregoing is true and correct. Executed on the 7th day of June, 2012.

Respectfully, Raymond A. Hruby, Jr.

General Manager, Technical Services Watts Bar Unit 2

Enclosure:

WBN Unit 2 Degraded Voltage Study cc (Enclosure):

U. S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Georgia 30303-1257 NRC Resident Inspector Unit 2 Watts Bar Nuclear Plant 1260 Nuclear Plant Road Spring City, Tennessee 37381

ENCLOSURE WBN Unit 2 Degraded Voltage Study SER Open Item 30 TVA should confirm that all safety-related equipment (in addition to the Class 1E motors) will have adequate starting and running voltage at the most limiting safety-related components (such as motor-operated valves (MOVs), contactors, solenoid valves or relays) at the DVR setpoint dropoutsetting. TVA should also confirm that (1) the motor-starting transientstudies are based on the dropout voltage value of DVR and time delay, (2) the steady-state voltage drop studies are carried out by maximizing running loads on the Class 1E distributionsystem (bounding combination of safety systems loads), with the voltage at 6.9-kV Class 1E buses (monitored by the DVRs) at orjust above the DVR dropoutsetting, and (3) the DVR settings do not credit any equipment operation (such as LTC transformers)upstream of the 6.9-kV Class IE buses. TVA should also confirm that the final technical specifications (TSs) are properly derived from these analytical values for the degraded voltage settings. This is Open Item 30.

TVA response:

TVA has performed an auxiliary power system study to update our response to this open item.

A copy of the study and two appendices and one attachment to the study are provided in below. This study was performed as a sensitivity analysis to determine ifthere is any impact on the Degraded Voltage Relay (DVR) setpoint and/or plant response if the current methodology is changed. This study did not credit any equipment operation (such as Load Tap Change [LTC] transformers) upstream of the 6.9 kV Class 1 E buses. The methodology used in this study was developed to meet the intent of Regulatory Issue Summary (RIS) 2011-12, "Adequacy of Station Electrical Distribution System Voltages". The RIS states that the protective function of the DVR setpoint is to ensure adequate starting voltage to all Class 1 E equipment for all operating and accident conditions. Additionally, the RIS states that the DVR setpoint must be based on the starting voltage requirement at the terminal of the most limiting component and must account for the effect of all components which could affect voltage; this includes offsite power circuits, the plant distribution system, as well as all Class 1 E and non-Class 1 E loads. However, the RIS does not prescribe a specific methodology to be used for the motor starting analysis, and there is no industry consensus as to how to best address DVR protection for motor starting scenarios. In actuality, the ability to start motors cannot be determined by monitoring voltage alone. The ability to start motors can only be determined by power system capacity, which is the ability to maintain voltage while providing the required starting current. Therefore, the premise of using a voltage relay to protect motor starting ability requires an assumption of the power source capacity, which seems inconsistent with the stated purpose of the DVR protective function.

Considering these constraints, TVA used an analytical approach to determine if the DVR setpoint provides the minimum required voltages at the terminals of the Class 1E loads during motor starting (automatic starting during a design basis event or individually) while still connected to the preferred offsite power source. The following Class 1 E motor starting scenarios were evaluated:

1. Dynamic Motor Starting - Safety Injection Signal Phase A (SIA)

2. Dynamic Motor Starting - Safety Injection Signal Phase B (SIB)

3. Static Motor Starting (starting individual motors). This analysis is performed with SIA since Safety Injection Signal Phase A provides the worst case voltages on the 480 V system. For this analysis, a motor starting study case is generated to individually start each Class 1 E motor.

E-1

ENCLOSURE WBN Unit 2 Degraded Voltage Study To perform the above analysis, the 6.9 kV shutdown boards were disconnected from all offsite power source(s) and a dedicated fixed voltage source was added to each 6.9 kV shutdown board (6.9 kV shutdown board was used as a swing bus).

The source voltage was set to the DVR analytical dropout limit of 6555 V.

This study concludes:

1. That adequate starting voltage is available to each Class 1 E load when the 6.9 kV Shutdown Boards are at the DVR dropout setpoint (analytical limit) for the following cases:

" During a design basis event (DBE): all Class 1 E loads that are automatically actuated for a safety injection signal (SI-Phase A or SI-Phase B).

When individually starting a motor (single motor start): all Class 1 E loads, even if not SI-actuated.

2. The study shows that for a sustained degraded voltage condition, overcurrent protective devices associated with Class 1 E loads will not trip during SI-actuated motor starting and subsequent start on the emergency diesel generator.

3. The bounding voltage recovery analysis demonstrates that any possible voltage transient caused by DBE motor starting, including drop to the loss of voltage (LOV) setpoint, will also result in successful recovery above DVR reset within 4 seconds.

With respect to the contactors, relays and solenoid valves, adequacy of pickup voltage for these control components was performed as part of the Control Circuit Voltage Drop (CCVD) analysis.

This analysis was performed considering a steady state minimum voltage of 432 V at the motor control center (MCC) bus. All the components were determined to have adequate pickup voltage upon implementation of issued design changes as identified in the CCVD calculation.

Implementation of these design changes is scheduled to be completed prior to Unit 2 fuel load.

The MCC transient bus voltage under degraded voltage conditions (at DVR dropout voltage of 6555 V) drops below 432 V due to starting of large motors on the 480 V switchgear. This voltage recovers to a value of >432 V within 4 seconds. Since the startup of the safety-related equipment may not have adequate starting voltage due to transient voltage conditions, Westinghouse evaluated the impact of an additional 5 second delay for the startup of the safety injection pumps and feedwater isolation valves with offsite power available, and-concluded the following: "This safety evaluation concludes that an additional five second delay for the startup of the safety injection pumps and an additional five second delay in the closure of the feedwater isolation valve does not impact the conclusions of the safety analysis that form the Watts Bar licensing basis (SECL-92-029; RIMS No. T33930330990)."

Based on the above, TVA considers that the analysis performed to verify adequacy of available voltage for the contactors, solenoid valves, and relays is adequate and no further analysis under the transient voltage conditions needs to be performed.

In conclusion, TVA confirms that safety-related equipment will have adequate starting and running voltage and that the Technical Specifications for degraded voltage settings are properly derived and appropriate.

E-2

ENCLOSURE WBN Unit 2 Degraded Voltage Study Attachment Excerpts from Sensitivity Study of Degraded Voltage Relay(DVR) Protection During Motor Starting STUDY-EEB-WBN-12-001, Rev. 1

1) Write up for Sensitivity Study

2) Appendix A for Evaluation of Class 1E Motor Starting Voltages

3) Appendix B for Degraded Voltage Relay LOV Voltage Recovery Analysis

4) Attachment 2 for Degraded Voltage Relay Settings E-3

CALCULATION SHEET CALC NUMBER: STUDY-EEB-WBN-12-001 REV. 001 SHEET 5 ORIGINATOR: D.S. Bhatia DATE: I CHECKER: A.C. Bangalore DATE:

1.0 Purpose The purpose of this study is to address the issues concerning degraded voltage relay (DVR) protection at WBN as documented in:

1. WBN NCV 05000390/2010005-003 "Failure to Use Worst Case 6900 VAC Bus Voltage in Design Calculations"

2. Watts Bar (WBN) Unit 2 NUREG-0847, Supplement 22, RAI Item 30

3. Recent regulatory developments in the industry with respect to DVR protection and analysis including NRC Regulatory Issue Summary (RIS) 2011-12, "Adequacy of Station Electrical Distribution System Voltages" These issues can be summarized as the need to determine ifthe DVR setpoint provides the minimum required voltages at the terminals of the Class 1E loads during motor starting (automatic starting during a design basis event or individually) while still connected to the preferred offsite power source.

Currently, the DVR analytical limit is determined by the Degraded Voltage Analysis calculation (Ref. 2.1), using methodology consistent with industry standard IEEE Std. 741-1997 and station licensing basis. The DVR setpoint methodology has not previously considered motor starting voltage as a basis of the relay setpoint. This study is being performed as a sensitivity study to see the impact to the setpoint and/or plant response ifthe current methodology is changed.

1.1 Scope This study determines if adequate starting voltage is available to each Class 1E load when the 6.9kV Shutdown Boards are at the DVR dropout setpoint (analytical limit) for the following cases:.

During a design basis event (DBE): all Class 1 E loads that are automatically actuated for a safety injection signal (SI-Phase A or SI-Phase B).

When individually starting a motor (single motor start): all Class 1E loads, even ifnot SI-actuated.

This study will also show that for a degraded voltage condition', overcurrent protective devices associated with Class 1E loads will not trip during SI-actuated motor starting and subsequent start on the emergency diesel generator.

This analysis is performed for both Unit I and Unit 2.

2.0 References 2.1 Calculation WBNEEBMSTI060029, Revision 33 "Degraded Voltage Analysis" 2.2 Calculation EDQ00099920070002, R22, "AC Auxiliary Power System Analysis (dual unit operation)"

2.3 Calculation WBNEEBEDQ1999010001, R75, "AC Auxiliary Power System Analysis" 2.4 NRC Regulatory Issue Summary (RIS) 2011-12, Revision 1, "Adequacy of Station Electrical Distribution System Voltages" 2.5 Watts Bar (WBN) Unit 1 NCV 05000390/2010005-03, "Failure to Use Worst Case 6900 VAC Bus Voltage in Design Calculations" 2.6 Watts Bar (WBN) Unit 2 NUREG-0847, Supplement 22, "Safety Evaluation Report Related to the operation of Watts Bar Nuclear Plant, Unit 2", RAI Item 30 2.7 Calculation WBNEEBMSTI06001 0, R76, "Auxiliary Power System Analysis on 1E Buses" (Historical Reference) 1 A degraded voltage condition is when the 6.9kV Shutdown Board voltage drops below the DVR setpoint, but not below the loss of voltage (LOV) setpoint, and does not recover.

CALCULATION SHEET CALCNUMBER: STUDY-EEB-WBN-12-001 REV. 001 I SHEET 6 ORIGINATOR: D.S. Bhatia DATE: I CHECKER: A.C. Bangalore DATE:

2.8 Calculation WBPE2119202001, R8, "6.9kV Shutdown Logic Boards Undervoltage Relays Requirements/Demonstrated Accuracy Calculation" 2.9 Limitorque Maintenance Update 92-2 (RIMS L33930113 803) - Extract from Design Guide DG-E2.4.6 2.10 TVA General Engineering Specification DS-E9.4.1, R1, Selection and Specifications of Motors 2.11 NEMA MG-1-1998, Motors and Generators 2.12 PER 298321 3.0 BaseslAssumptions 3.1 The DVR dropout analytical limit (6555V) as determined in the Degraded Voltage Analysis calculation (Ref. 2.1) will be used to determine the available starting voltage.

3.2 The ETAP model used to perform offsite power analysis for dual unit operation (Ref. 2.2) is used to perform the motor starting analysis.

3.3 All process controlled loads (random loads) are conservatively considered to start at zero seconds in a DBE.

3.4 The Phase A Start Sequence evaluates a Safety Injection Initiation without receipt of a Phase B Containment Isolation (High Containment Pressure). The Phase B Start Sequence evaluates a Safety Injection Initiation with receipt of a Phase B Containment Isolation.

The short term steady state loading at the 480V level is higher during a Phase A start sequence than during a Phase B and results in a lower voltage at the 480V busses. However, piping breaks associated with a Phase A Start Sequence are small and will result in ECCS equipment being removed from service within a short period after the event (less than an hour). This will result in a much lower overall long term loading for a Phase A event when compared to a Phase B.

This study uses short term Phase A loading for the single motor start analysis since it is the most conservative loading. If,however the starting voltage (480V) is not acceptable using the Phase A loading, then Phase B loading is used provided:

" The load is only required for a Phase B event, or

" The load is required to be manually started at a time that is at least 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months after the initiation of a Phase A event.

This assumption is conservative since the long term 480V loading for a Phase B event is higher than for a Phase A event.

3.5 The 89-10 MOVs for WBN2 utilize motor actuators which have 'hammer-blow' feature, which allows the motor to start turning prior to engaging the mechanical load of the operator (i.e. start unloaded). The actual motor current draw is typically 50% of the full locked-rotor current (Ref. 2.9). Initially all MOVs are evaluated using full locked-rotor current but if the available voltage does not meet the required voltage criteria, the available voltage is re-calculated taking credit for the 'hammer-blow' feature. These MOVs are identified in Appendix A.

CALCULATION SHEET CALCNUMBER: STUDY-EEB-WBN-12-001 REV. 001 SHEET 7 ORIGINATOR: D.S. Bhatia DATE: CHECKER: A.C. Bangalore DATE:

4.0 MethodologylApproach The methodology used in this study was developed to meet the intent of Regulatory Issue Summary (RIS) 2011-12, "Adequacy of Station Electrical Distribution System Voltages". The RIS states the protective function of the DVR setpoint is to ensure adequate starting voltage to all Class 1E equipment for all operating and accident conditions.

Additionally, the RIS states that the DVR setpoint must be based on the starting voltage requirement at the terminal of the most limiting component and must account for the effect of all components which could affect voltage, this includes offsite power circuits, the plant distribution system, as well as all Class 1E and non-Class 1E loads.

However, the RIS does not prescribe the specific methodology to be used for the motor startinpg analysis, and there is no industry consensus on how to best address DVR protection for motor starting scenarios. In actuality, the ability to start motors cannot be determined by monitoring voltage alone. The ability to start motors can only be determined by power system capacity, which is the ability to maintain voltage while providing the required starting current. Therefore, the very premise of using a voltage relay to protect motor starting ability requires an assumption of the power source capacity, which seems to violate the stated purpose of the DVR protective function.

An analytical approach is used in this study to determine the acceptability of the voltage during any Class 1E motor starting scenario that bounds any value of upstream capacity. This approach is based on the fact that for any Class 1E motor starting event (single motor or group of motors), the voltage at the DVR monitored bus can only respond in one of three ways:

1. The voltage decreases to the DVR setpoint, or above (i.e. DVR does not actuate)

2. The voltage decreases below the DVR setpoint and does not recover (i.e. DVR actuates and transfers loads to the DGs after the specified time)

3. The voltage decreases below the DVR setpoint and does recover (i.e. DVR actuates but does not initiate transfer since voltage remains above the LOV setpoint and recovers above the DVR reset value prior to timeout)

Analyses are performed for each of these situations as follows:

1. A starting voltage analysis is performed using a technique known as the "independent source" method. The voltage at the DVR monitored bus (i.e. 6.9kV Shutdown Board) is set at the DVR setpoint (dropout analytical limit) using an independent fixed voltage source. Since the initial DVR bus voltage prior to the event can be ignored, this simple technique produces correct voltages for downstream loads immediately after the initiation of the event. The analysis is performed for DBE motor starting (SI-actuated loads) as well as individual motor starts.

2. A protective device analysis is performed using a technique known as the "start-start" method. Since this is truly a degraded voltage situation, there is no need for a starting voltage analysis. However, an analysis should be performed to demonstrate that the Class 1E loads will be successfully transferred to the DG and started prior to their protective devices tripping. This "start-start" analysis was previously performed in the Degraded Voltage Analysis calculation (reference 2.1) and the results are reprinted in this study.

3. For DBE motor starting events, a bounding analysis is performed to demonstrate that any possible voltage transient caused by DBE motor starting, including drop to the LOV setpoint, will also result in successful recovery above DVR reset within 5 seconds (without crediting automatic load tap changers). For individual motor starting events, this situation is bounded by the starting voltage analysis from item 1 since the analysis at DVR dropout is more conservative than analysis at the DVR reset value.

These analyses bound any possible voltage outcome at the DVR monitored bus when starting any Class 1E motor required for any scenario.

2 IEEE Power &Energy Society, Nuclear Power Engineering Committee (NPEC), Working Group 4.7 (Protection of Class 1E Power Systems and Equipment) meeting minutes of January 24, 2012, San Antonio, TX.

CALCULATION SHEET CALC NUMBER: STUDY-EEB-WBN-12-001 REV. 001 SHEET 8 ORIGINATOR: D.S. Bhatia DATE: CHECKER: A.C. Bangalore DATE:

5.0 Design Input Data 5.1 For individual minimum motor starting voltage requirements, see Appendix A.

5.2 The degraded voltage relay setpoints are as follows (Ref. 2.1, 2.8 &Aft. 2 of this study):

Dropout (V) Reset (V)

Nominal Setpoint 6600 6642 Allowable Value 6570 6672 Analytical Limit 6555 N/A Operational Limit N/A 6681

CALCULATION SHEET CALCNUMBER: STUDY-EEB-WBN-12-001 REV. 001 7TSHEET 9 ORIGINATOR: D.S. Bhatia DATE: CHECKER: A.C. Bangalore DATE:

6.0 Computations and Analysis The motor starting analysis is performed using ETAP V7.0.ON and the existing ETAP model used to perform offsite power system analysis for two unit operation (Ref. 2.2).

6.1 Starting Voltage Analysis The 6.9kV shutdown boards were disconnected from all offsite power source(s) and a dedicated fixed voltage source was added to each 6.9kV shutdown board. The source voltage was set to the DVR dropout setting of 6555V (Section 5.2).

Using the load configuration in the existing Unit 1&2 ETAP model, the following analyses were performed:

" Dynamic Motor Starting - Safety Injection Signal Phase A (SIA)

" Dynamic Motor Starting - Safety Injection Signal Phase B (SIB)

" Static Motor Starting (starting individual motor): This analysis is performed with SIA since this provides the worst case voltages on the 480V system. For this analysis, motor starting study case is generated to individually start each Class 1E motor. Resolutions to loads requiring additional review are annotated in Appendix A. Ifthe starting voltage using Phase A is not acceptable, analysis is performed using Phase B loading DBE Motor Starting:

Each study case is run for a total simulation time of 15 seconds. Since it is considered that by this time all motors have been accelerated and the APS system has come to a steady state condition. ETAP reports provide terminal voltage and current for every motor which starts at 0+ second up to 15 seconds in steps of 0.1 second.

The output reports are saved as Ul sdbds at DVDO-Complete (Study Case U1-DV-SIBms, Config. DV-LOCA-U1), U2 sdbds at DVDO-Complete (Study Case U2SIB-DV(N), Config. DV-LOCA-U2) and U12 sdbds at DVDO-Complete (Study Case UI/2SIA, Config. Deg Volt SU) in folder J:\wbnp\DVR Analysis (Static) WBN\ETAP Reports - Dynamic Motor Analysis.

Single Motor Starting:

Each study case is run using 'Study Case ID U1/2SIA and Config. Deg Volt SU'.

The output reports, in pdf format, are saved in folders J:\wbnp\DVR Analysis (Static) WBN\ETAP Reports -

Shutdown Boards 1A and 1B and J:\wbnp\DVR Analysis (Static) WBN\ETAP Reports Shutdown Boards 2A and 2B\New Reports. Due to the large number of output reports, the output report names are not listed.

These analyses did not credit any non-Class 1E equipment upstream of the 6.9-kV Class 1E buses (such as LTC transformers or administratively controlled grid capacity). The available starting voltage for each motor is then documented and compared to the required starting voltage.

6.2 Protective Device Analysis (Start-Start scenario):

The scenario evaluated for the short time delay is an SI concurrent with the degraded voltage condition such that a block start attempt is made. A determination is made of the time permitted to allow voltage to return above the degraded voltage relay setpoint reset limit under block start transient conditions and still assure a subsequent start on the diesel ifthe voltage fails to recover, thus, making this a start-start evaluation. To evaluate the effect of the starting currents during the start-start scenario, the effect on overcurrent protective devices are considered. The board voltages at the onset of the event are, considered normal (i.e. no preheat). The degraded voltage condition presumes that the voltage does not recover but remains below the degraded voltage relay setpoint subjecting the SI initiated motors to starting currents for the time delay selected and then sequence onto the emergency diesel generators.

The design calculated worst-case transient voltage dip during the accident loading sequence is used.

This is conservative, because a lower voltage would produce less starting current for the motors.

CALCULATION SHEET CALC NUMBER: STUDY-EEB-WBN-12-001 REV. 000 SHEET 10 ORIGINATOR: D.S. Bhatia DATE: CHECKER: A.C. Bangalore DATE:

The above evaluation is performed for the safety related loads required for Units 1 and 2 which would be actuated for an SI as follows:

Motor loads fed from 6.9kV and 480V Switchgear & MCCs, MOVs & Static loads fed from the MCCs are evaluated to determine the effect of the start-start heating of the overcurrent protective devices (breakers/TOLs), such that starting on the diesel without tripping can be assured.

" Protective devices are also evaluated for the 6.6kV and 460V safety-related motors that operate during non-accident conditions. The evaluation considers that the safety bus voltage is equivalent to operation at the lower boundary of the degraded voltage relay dropout The protective devices are evaluated to ensure that operation of the safety-related loads can be sustained indefinitely at this voltage without protective device trip.

" SI actuated medium voltage (6.6kV) motor loads are evaluated to ensure that their thermal damage limits are not exceeded during the start-start event.

120VAC control power transformer (CPT) fuse time characteristics are evaluated to determine ifthe fuse could blow when carrying rated inrush current of the starter and any other normally energized devices for the safety analysis time of 11.5 seconds (upper boundary of the degraded voltage relay time delay, Attachment 2) or 12 seconds in the start-start scenario.

MCC 120VAC distribution panel fuse time characteristics are evaluated to determine if the fuses melt during the start attempts. It is considered that circuit components required to pick-up during starting will be at inrush conditions.

6.3 Voltage Recovery Analysis:

See Appendix B for voltage recovery analysis for DBE for detailed purpose, approach, bases and assumptions and computations.

CALCULATION SHEET CALCNUMBER: STUDY-EEB-WBN-12-001 REV. 001 SHEET 11 ORIGINATOR: D.S. Bhatia DATE: CHECKER: A.C. Bangalore DATE:

7.0 Summary of Results 7.1 Starting Voltage Analysis See Appendix A for summary of the results. Based on a review of the results, all safety related loads have adequate starting voltage during DVR conditions and the existing setpoints for the degraded voltage relay are considered acceptable. -

Note: ERCW Screen Wash Pumps are not assured to have adequate voltage as analyzed. However per N3-67-4002 this load is not required to be manually placed into service until 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months into a design basis event.

This provides sufficient time to take corrective actions such as correcting the grid condition, adjusting the tap changers on the CSSTs or transferring the shutdown board(s) to the diesel generators.

Control Circuit Voltage Drop (CCVD) Analysis With respect to the contactors, relays and solenoid valves, adequacy of pickup voltage for these control components (contactors, solenoid valves, relays) were performed as part of the Control Circuit Voltage Drop (CCVD) analysis. This analysis was performed considering a steady state minimum voltage of 432V at the MCC bus. All the components were determined to have adequate pickup voltage upon implementation of the issued design changes as identified in the CCVD calculation prior to Unit 2 fuel load.

The MCC transient bus voltage under degraded voltage conditions (at DVR dropout voltage of 6555V) drops below 432V due to starting of large motors on the 480V switchgear. This voltage, however, recovers to a value of >432V within 4 seconds. Since the startup of the safety related equipment may not have adequate starting voltage due to transient voltage conditions, Westinghouse evaluated the impact of additional 5 second delay for the startup of the safety injection pumps and feedwater isolation valves with offsite power available, and concluded the following: "This safety evaluation concludes that an additional five second delay for the startup of the safety injection pumps and an additional five second delay in the closure of the feedwater isolation valve does not impact the conclusions of the safety analysis that form the Watts Bar licensing basis (SECL-92-029; RIMS No. T33930330990)".

Based on the above, the analysis performed to verify adequacy of available voltage for the contactors, solenoid valves, relays is considered to be adequate and, therefore, no further analysis under the transient voltage conditions has been performed.

7.2 Protective Device Analysis Motors Actuated by SI Signal:

As discussed in Attachment 7, there is no adverse effect of the start-start heating on the overcurrent devices on the safety related motors which would be actuated by safety injection signal and powered from safety related 6.9kV and 480V switchgears and 480V MCCs while operating at the lower boundary of the degraded voltage relay setting (6555V).

Non-Accident Safety Related Motors:

Based on the analysis, operation of safety-related loads with the 6.9kV Shutdown Board voltage operating at the lower boundary of the degraded voltage relay 6555V, will not cause tripping of protective devices. Static loads (constant impedance) are not considered, since operation at lower voltage results in less current. Therefore, operation at the lower boundary of the degraded voltage relay dropout setting would not trip the motors.

TOL Evaluation:

The generic evaluation of TOL's, in Attachment 7, showed that only motors having locked rotor current in excess of 850% are required to be evaluated further. A review of the WBN ETAP database, showed that four motors have a locked rotor current greater than 850% and start for an accident. An evaluation of those four loads shows that their TOL's are set at 115%. Therefore they would not be an issue, because it would increase their tolerance for tripping by an additional 15%.

CALCULATION SHEET CALC NUMBER: STUDY-EEB-WBN-12-001 IREV. 000 SHEET 12 ORIGINATOR: D.S. Bhatia DATE: CHECKER: A.C. Bangalore DATE:

8.0 Conclusions 8.1 This study determines that adequate starting voltage is available to each Class 1E load when the 6.9kV Shutdown Boards are at the DVR dropout setpoint (analytical limit) for the following cases:

" During a design basis event (DBE): all Class 1E loads that are automatically actuated for a safety injection signal (SI-Phase A or SI-Phase B).

" When individually starting a motor (single motor start): all Class 1E loads, even if not SI-actuated.

8.2 This study shows that for a degraded voltage condition, overcurrent protective devices associated with Class 1E loads will not trip during SI-actuated motor starting and subsequent start on the emergency diesel generator.

8.3 The bounding voltage recovery analysis demonstrates that any possible voltage transient caused by DBE motor starting, including drop to the LOV setpoint, will also result in successful recovery above DVR reset within 4 seconds.

Therefore, using motor starting voltage as a basis for the relay setpoint shows no impact to the DVR setpoint and/or the plant response.

CALCULATION SHEET CALCNUMBER: STUDY-EEB-WBN-12-001 7 REV. 001 SHEET 13 ORIGINATOR: D.S. Blhatia DATE: 7CHECKER: A.C. Bangalore DATE:

8.0 Conclusions 8.1 This study determines that adequate starting voltage is available to each Class 1E load when the 6.9kV Shutdown Boards are at the DVR dropout setpoint (analytical limit) for the following cases:

" During a design basis event (DBE): all Class 1 E loads that are automatically actuated for a safety injection signal (SI-Phase A or SI-Phase B).

" When individually starting a motor (single motor start): all Class 1E loads, even if not SI-actuated.

8.2 This study shows that for a degraded voltage condition, overcurrent protective devices associated with Class 1E loads will not trip during SI-actuated motor starting and subsequent start on the emergency diesel generator.

8.3 The bounding voltage recovery analysis demonstrates that any possible voltage transient caused by DBE motor starting, including drop to the LOV setpoint, will also result in successful recovery above DVR reset within 4 seconds.

Therefore, using motor starting voltage as a basis for the relay setpoint shows no impact to the DVR setpoint and/or the plant response.

This page added by R1

STUDY-EEB-WBN-12-001 APPENDIX A Page i Appendix A Introduction This appendix is a summary tabulation of the results for the various motor starting scenarios described in Section 6.0. The analyses in Appendix A were developed using the methodology and applicable inputs from References 2.2, and 2.3. Voltage values were obtained from the applicable ETAP files and output reports in this study. The key information and results are determined as follows:

A. Minimum Motor Starting Voltage Minimum motor starting voltages are based on Attachments 1, 3 and 6 of this study. The minimum motor starting voltages used are:

6600 Volt Motors - 5280 Volts (80%)***

460 Volt Motors - 391 Volts (85%)**

460 Volt Air Compressors - 368 Volts (80%)**

89-10 MOVs - Valve thrust and torque design margin calculations/evaluations based on motor terminal voltage as documented in Attachments 4 and 5 of this study.

Non 89-10 MOVs - 368 Volts (80%)**

- Percentages are based on 460 Volt rated motor voltage. For motors rated other than 480V, the same percentages are applicable. The minimum starting voltage may be different from the above voltage if it is based on manufacturer's data or test report as documented in Attachments 3 and 6 of this study.

- - 80% for all motors except for the ERCW Pump motor which requires 90% and the Auxiliary Feedwater Pump motor which requires 85%

B. Motor Starting Evaluation Results Individual motor starting evaluation results are tabulated for all class 1 E safety-related motors and motor operated valves. As summarized in Section 6.1 of this study the following steps were performed:

1. Motor terminal voltage with Phase A loading is compared against the minimum motor starting requirements above. If acceptable voltage is obtained, no further action is required.

2. Motor terminal voltage with Phase B loading is compared against the minimum motor starting requirements above. If acceptable voltage is obtained, no further action is required.

3. Single motor start terminal voltage with Phase A loading or with Phase B loading provided the Phase B criteria in section 3.4 of this study applies is compared against the minimum motor starting requirements above. If acceptable voltage is obtained, no further action is required.

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STUDY-EEB-WBN-12-001 APPENDIX A Page ii

4. Individual circuit operating evaluations are performed based on when the motor is in service such as the ERCW Screen Wash Pump.

5. For 89-10 MOVs, See Section C below.

C. 89-10 Motor Operated Valve Evaluation Results For Unit 1 and Unit 2 89-10 MOVs that did not meet the required valve motor starting voltage criteria, as a first step the calculated starting voltages for these MOVs were provided to Mechanical discipline (valve group) to evaluate if the revised voltages were acceptable.

Based on the new thrust and torque calculations and calculated new design margins by mechanical valve group, the new available starting voltage for some MOVs was determined to be acceptable. However, some of the MOVs still did not meet either the required voltage or the minimum design margin criteria. Available voltage for these MOVs were re-evaluated further using the hammer-blow (HB) feature (see Section 3.5) which resulted in improved starting voltage available at the motor terminals. The available voltage with HB feature was again evaluated by the mechanical valve group and determined to be acceptable.

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Calc. STUDY-EEB-WBN-12-O01 Appendix A Rev. 0 1A Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation ISI-A or SI-RI nnd Individual Mntnr Starts Results ... ....... . ..E ... ..... io .... o . .. .... .................. . tart SI Phase A SI Phase B Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage (N) Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage V(%)

ETAP Bus ID/ SI Phase A 6.6kv / 460V se B 6.6kV /460V Base 6.6kv/460V ComptNoLoad Description 6.6kV /460V Base Base Base 6.9KV Shutdown Board IA-A Aux Feedwater PMP 1A-A 12-10 AFW 1-MTR-3-118-A (600 HP) 99.09 Starts 99.09 Starts 99.07 85 CNTMT SPRAY PMP IA-A 12-13 CSP 1-MTR-72-27-A (700 HP) N/A Not Running 98.81 Start 98.80 80 RHR PUMP IA-A 12-14 RHR I-MTR-74-10-A (400 HP) 98.97 Starts 98.97 Starts 98.96 80 SAFETY INJ PMP 1A-A 12-15 SI 1-MTR-63-10-A (400 HP) 98.94 Starts 98.94 Starts 98.94 80

.NTFGL CHRG PMP 1A-A 12-18 CCP I-MTR-62-108-A (600 HP) 98.91 Starts 98.91 Starts 98.90 80 Starts (A-A Starts ( A-A or B-A start, or B-A start, but not both, but not both, ERCW PMP A-A other is not other Isnot 12-8 ERCW 0-MTR-67-28-A (800 HP) N/A running) N/A running) 96.45 90 Starts (A-A Starts ( A-A or B-A start, or B-A start, but not both, but not both, ERCW PMP B-A other Is not other Isnot 12-9 ERCW 0-MTR-67-32-A (800 HP) 93.2.5 running) 93.25 running) 93.12 90 480V Shutdown Board 1A1-A Comp Cooling Sys Pump IA-A 125-38 1-MTR-70.46-A (3SOhp) 83.59 Starts 84.18 Starts 83.61 70 Not Runn ng Iot Running Containment Air Rtn Fan IA-A Starts @ 9 Starts @ 9 126-10C 1-MTR-30-38-A(100hp) N/A Min) N/A Min) 80.82 (SIB) 80 Reac Lwr Compt Cir Fan 1A-A 126-7C 1-MTR-30-74-A (B0hp) N/A Running N/A Trips 82.32 80 Ele:c Bd Rm AHU A-A 126-9C 0-MTR-31-30B-A (SOhp) N/A Running N/A Running 84.46 80 Spent Fuel Pit Pump C-S 126-7A D-MTR-78-35-S (100hp) N/A Running N/A Running 82.06 (SIB) 80 480V Shutdown Board 1AZ-A Control Rm A/C A-A Compressor 127-2C o-MTR-31-80/2-A (250hp) N/A Running N/A Running 90.44 85 Page 1 of 27

Calc. STUDY-EEB-WBN-12-O01 Appendix A Rev. 0 1A Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation (SI-A or SI-B) and Individual Motor Starts SI Phase A SI Phase B Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage V(%)

ETAP Bus ID/ L 6.6kV/460V Compt No Load Description 6.6kV / 460V Base SI Phase A 6.6kV / 460V Base Si Phase B 6.6kV /460V Base Base Comp Cooling Sys Pump C-S 127-38 O-MTR-70-51-S (350hp) 81.68 Running 82.15 Running 81.05 70 Reac Lwr Compt ar Fan IC-A 128-7D 1-MTR-30-77-A (60hp) N/A Running N/A Trips 83.29 80 480V SD BdRm AHU A-A 128-9D 0-MTR-31-45-A (7Shp) N/A Running N/A Running 89.60 85 480M C&A Vent Board 1A1-A _

Ctat Bldg Emerg Press Fan A-A 203-128 O-MTR-31-6-A (lhp) 87.37 (25) Start 85.95 Start 88.21 85 ERCW Sun Wash Pump 1A-A 203-13D 1-MTR-67-431-A (40hp) N/A N/A N/A N/A 74.85 75 Cont Bldg Emerg Air CU Fan A-A 203-2A 0-MTR-31-8-A (10hp) 85.2 Start 86.44 Start 89.13 85 Cntmt Spray Pump 1A-A ar Fan 203-3C 1-MTR-30-177-A (7.Shp) N/A Running 82.61 Starts 83.17 80 Emerg Gas Trtmt Sys Fan A-A 203-40 0-MTR-65-23-A (20hp) 86.03 Start 87.3 Start 91.05 75 ERCW Str 1A-A 203-68 1-MTR-67-9-A (3hp) N/A Running N/A Running 76.71 75 Cntfg Chrg Pmp IA-A Rm CarFan, 203-IOA 1-MTR-30-183-A, (5 HP) 83.95 Start 85.18 Start 87.97 80 PEN RM EL713 CERFAN IA-A, 203-10B 1-MTR-30-196-A, (3HP) 85.48 Start 86.73 Start 90.91 80 Pipe Chase Or Fan IA-A, 203-I0C 1.MTR-30-201-A, (3 HP) 84.25 Start 85.48 Start 89.17 80 480V BD RM 18 PR SUP FAN 181-A 203-IIA 1-MTR-31-478-A, (3HP) N/A N/A N/A N/A 92.83 85 480V Bd Rm 1AA/C Ahu 1A-A 203-IIC 1-MTR-31-461-A (15 HP) N/A N/A N/A N/A 90.71 85 Cant Rm Ahu A-A 203-11D 0.MTR-31-12-A (60 HP) N/A N/A N/A N/A 88.84 85 125V Vti Bat Rm II ExFan 1B1-A 203-12A 1-MTR-31-285-A (0.33 HP) N/A N/A N/A N/A 91.80 85 480V Bd Rm 1A A/C Cond 1A-A 203-12C 1-MTR-31-290-A. (15 HP) N/A N/A N/A N/A 91.40 85 Page 2 of 27

Caic. STUDY-EEB-WBN-12-001 Appendix A Rev. 0 1A Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Limit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation (SI-A or SI-B) and Individual Motor Starts SI Phase A SI Phase B Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage V(%)

ETAP Bus ID/ Phase 6.6kV/460V ComptNo Load Dsription 6.6kV / 460V Base S A 6.6kV / 460V Base SI Phase B 6.6kV /460V Base Base Cntmt Purge Air Radn Exh Mon 203-12F1 1-RE-90-130-A, (0.75 HP) N/A N/A N/A N/A 93.37 85 PEN RM EL692 CLR FAN 1A-A 203-2C 1-MTR-30-186-A, (3HP) 84.94 Start 86.18 Start 90.37 80 Btr, Rm El 692 Exh Fan A-A 203-4A O.MTR-31-28-A (1.SHP) N/A N/A N/A N/A 88.45 85 5TH VITL BATT.RM.EX. FAN 1B1-A 203-48 0-MTR-31-493B-A (0.25 HP) N/A N/A N/A N/A 94.40 85 SFP Pmp A-A&TB BSt Pm SpCIrFan 203-5A 0-MTR-30-192-A (7.SHP) 87.48 (2S) Start 86.06 Start 89.85 85 CCS & AFW PMPS SP C.R FAN A-A 203-5E 1-MTR-30-190-A (20HP) 86.11 Start 87.36 Start 91.01 80 Shutdown 8d Rm A Press Fan A-A 203-6A 0-MTR-31-64-A (3HP) N/A N/A N/A N/A 93.03 85 Traveling Scm IA-A 203-6C 1-MTR-67-434-A (5HP) N/A N/A N/A N/A 80.66 80 Cn.tmt Bldg Lwr Compt Air Mon 203-6F1 1-RE-90-106-A (3HP) N/A N/A N/A N/A 93.46 85 125V Vti Bat Rm I ExhFan 1A1-A 203-78 1-MTR-31-287-A (0.33HP) N/A N/A N/A N/A 91.74 85 Safety InJPmp 1A-A Am COr Fan 203-8A 1-MTR-30-180-A (SHP) 82.19 Start 83.39 Start 85.53 80 Pen Rm El737 CIr Fan IA-A 203-SB 1-MTR-30-194-A (3HP) 86.83 Start 88.1 Start 92.69 80 480V Xfmr Rm 1A Exh Fan 1A2-A 203-SC 1-MTR-30-244G-A (3HP) N/A N/A N/A N/A 89.97 80 480V Xftnr Rm 1A Exh Fan 1A3-A 203-8O I-MTR-30-244H-A (3HP) N/A N/A N/A N/A 91.75 80 CONT RM A/C A-A CONTROL/O.PMP 203-8F1 0-MTR-31.-/3-A (3.11 HP) N/A N/A N/A N/A 93.28 85 RHR Prmp 1A-A Rm CJrFan 203-9A I-MTR-30-175-A (SHP) 82.27 Start 83.47 Start 85.63 80 Cant Rm A/C Circ Pmp A-A 203-98 0-MTR-31-80/1-A (15HP) N/A N/A N/A N/A 89.52 85 480V Bd Rm 1A Pr Sup Fan 1A1-A 203-9C 1-MTR-31-462-A (3HP) N/A N/A N/A N/A 93.45 85 480V Xfmr Rm 1A Exh Fan WA1-A 203-9D 1-MTR-30-244F-A (3HP) N/A N/A N/A N/A 90.00 85 Cant Rm Intake Mon 203-9F1 -t-RE-90-205-A (0.7SH P) N/A N/A N/A N/A 93.75 85 ERCW Str 1A-A Backwash VIv 203-4E 1-FCV-67-9A-A (0.33HP) N/A N/A N/A N/A 81.88 Pass ERCW Str IA-A Flush VIv 203-6E I-FCV-67-98-A (0.33HP) N/A N/A N/A N/A 82.56 Pass RHR PMP IA-A INLET FCV 203-7D 1-FCV-74-3-A (5.2HP) N/A N/A N/A N/A 91.16 Pass RWST TO SPRAY HDR 1A FCV 203-7E 1-FCV-72-22-A (3.2HP) N/A N/A N/A N/A 86.12 Pass Page 3 of 27

Calc. STUDY-EEB-WBN-12-O01 Appendix A Rev. 0 1A Boards I EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Limit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation (SI-A or Si-Bland Individual Motor Starts SI Phase A SI Phase B Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage I%) Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage V(%)

ETAP Bus ID/ J16.6kV/460V Compt No I Load Description 6.6kV / 460V Base SI Phase A 6.6kV / 460V Base SI Phase B 6.6kV /460V Base Base 480V C&A Vent Board 1AZ-A None I 480V Diesel Aux Board 1A1.A OG IA-A Rm Exh Fan 1-A 217-2B 1-MTR-30-447-A (1Shp) 90.72 Starts 91.33 Start 92.82 85 DG IA-A Day TIrFO XFR PMP 1 217-3D 1-MTR-18-55/1-A (lhp) 90.73 Random 91.34 Random 94.88 85 DG 1A-A AUX LUBEOIL CIRC PMP A 217-49 1-MTR-82-AOPA1A (0,75hp) 91.05 Random 91.66 Random 94.71 85 Og Rm IA-A Pni Vent Fan 217-4D 1-MTR-30-491-A (15HP) N/A N/A N/A N/A 92.27 85 Dg IA-A 480V Elec ad Rm Ex Fan 217-4E 1-MTR-30-459-A (2HP) 90.91 N/A 91.5 N/A 94.43 85 TM DG HXIA1 & 1A2 SPLY VLV 217-3A 1-FCV-67-66-A (0.13HP) 81.56 N/A 82.1 N/A 85.68 80 DG IA-A Muffler Rm Exh Fan 217-6A 1-MTR-30-463 (0.5hp) 90.83 Starts 91.44 Running 95.19 85 480V Diesel Aux Board 1A2-A DG 1A-A Rm Exh Fan 2-A IRunning/

218-2B 1-MTR-30-451-A (15hp) 92.41 Starts 92.88 Start 93.22 85 DG IA-A DAYTNK FO XFRPMP 2 218-3D 1-MTR-18-54/1-A (1hp) 91.64 Random 92.1 Random 94.22 85 DG IA-A AUX LUBEOIL CIRC PMP B 218-2A 1-MTR-82-AOPB1A (0.75HP) N/A N/A N/A N/A 93.80 85 Dg 1A-A Lube oil arc Prp 2 218-2D 1-MTR-82-A2-A (1HP) N/A N/A N/A N/A 93.75 85 Dg Bldg Co2 Refrigeration Unit 218-SFI 0-PKG-39-37 (2HP) N/A N/A N/A N/A 94.86 85 480V RMOV Board IA1-A Lower CNTMT 18 CtRS ISLNVLV 235-SC 1-FCV-67-97-A (0.13hp) N/A Not Running 80.6 Starts 85.01 Pass Seal Flow Ret Isin Viv Coses -on Ph Clos-eson Ph 235-7A 1-FCV-62-63-A (1.Shp) 77.96 A(Starts) 79.06 A (Starts) 83.32 Pass CHARGING FLOW ISLN VLV Closes on SI Closes on Sl 235-71 1-FCV-62-9O-A (1.Shp) 77.05 (Starts) 78.15 (Starts) 82.36 Pass Vol Cont Tank Outlet Isln Viv loses an 51 Closes -onSI 235-8B 1-LCV-62-132-A (L9hp) 79.54 (Starts) 80.68 (Starts) 85.02 Pass RWST To Charging Pmp Vlv Cant Opens on SI Opens on SI 235-9A 1-LCV-62-135-A (Lghp) 82.76 (Starts) 83.94 (Starts) 88.45 Pass RCP Oil Ur Cntmt Iso VIv Closes 235-9D 1-FCV-70-100 (0.13hp) N/A Not Running 80.49 fStarts) 84.90 Pass SIS Pmp Inlet to CVCS Chrg Pmp 235-IIA 1-FCV-63-7 (1.hp) N/A Not Running N/A. Not Running 88.210 Pass Page 4 of 27

Calc. STUDY-EEB-WBN-12-O01 Appendix A Rev. 0 1A Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation (SI-A or SI-B) and Individual Motor Starts SI Phase A SI Phase B Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage ETAP Bus ID/

Comet No I D

Load Description Terminal Voltage (%)

6.6kV / 460V Base 1 P Si Phase A Terminal Voltage (%)

6.6kV / 460V Base SI Phase B Terminal Voltage (%)

6.6kV /460V Base Terminal Voltage V(%)

6.6kV/460V Base SIS Boron Inj Tank Shutoff viv Opens on Si Opens on SI 235-11D 1-FCV-63-26 (1.9hp) 83.540 (Starts) 80.29 (Starts) 84.61 Pass uperaze upperate about 20 about 20 Cntmt Sump To RHR Pmp A-A minutes after minutes after 235-12B 1-FCV-63-72-A (13hp) 81.75 S1 82.9 Si 86.95 Pass Cntmt Spray Hdr 1A Isln Vlv Opens on Ph 235-13E 1-FCV-72-39-A (3.2hp) N/A Not Running 92.54* (5s) B (Starts) 91.80' Pass RHR Pmp IA-A Min Flow VIv 235-14D 1-FCV-74-12-A (0.13hp) 79.62 Random 80.74 Random 85.17 Pass LWR CNTMT 1D CLRS ISLNVLV .. oses 235-15D 1-FCV-67.89-A (0.13hp) N/A Not Running 80.71 (Starts) 85.13 Pass Cntmt Standpipe Isin Viv 235-178 1-FCV-26-240-A (0.67hp) 81.4 Close (Start) 82.55 Close (Start) 87.05 Pass RCP Spray Isla Viv 235-I8E 1-FCV-26-243-A (0.67hp) 82.65 Close (Start) 83.82 Close (Start) 88.39 Pass RWST To RHR Pmp Flow Cont VIv 235-2E1 I-FCV-63-1-A (S.2HP) N/A N/A N/A N/A 92.09* Pass RHR Sys Isln VIv 235-S8 1-FCV-74-1-A(2.6HPl N/A N/A N/A N/A 90.74* Pass RCS Press Relief FCV 235-6D 1-FCV-68-333-A (L9HP) N/A N/A N/A N/A 89.2* Pass SIS Pmp Recirc To RWST 235-IOB 1-FCV-63.3-A (0.7HP) N/A N/A N/A N/A 90.70* Pass Cont Spray Pmp 1A-A Recirc FCV 235-IOF I-FCV-72-34-A (0.13HP) N/A N/A N/A N/A 89.39* Pass RHR Hx A To CVCS Chrgr Pmp 235-118 1-FCV-63-8-A (L9HP) N/A N/A N/A N/A 87.48 Pass SIS Pmp 1A-A Inlet VIv 235-12A 1-FCV-6347-A (L9HP) N/A N/A N/A N/A 88.180 Pass SIS To RCS loops 2&3 FCV 235-120 1-FCV-63-93-A (1.6 HP) N/A N/A N/A N/A 90.65 Pass Page 5 of 27

Calc. STUDY-EEB-WBN-12-001 Appendix A Rev. 0 2A Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation (SI-A or SI-B) and Individual Motor Starts SI Phase A SI Phase B Minimum Required DBE Actuation OBE Actuation Individual Motor Start Voltage Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage J%) Terminal Voltage VN%

ETAP Bus ID/ 1_6.6kV/460V Compt No Load Description 6.6kV/460V Base SI Phase A 6.6kV /460V Base SI Phase B 6.6kV/460V Base Base SIS Pmp 1A-A Outlet FCV 235-12E 1-FCV-63-152-A (3-gHP) N/A N/A N/A N/A 8848* Pass SIS Pmp Out RCS Lp 1&3 Hot Leg 235-13A L-FCV-63-156-A (1.9HP) N/A N/A N/A N/A 89,28* Pass Cntmt Sump To Spray Hdr 1A FCV 235-13B 1-FCV-72-44-A (3.2HP) N/A N/A N/A N/A 90,330 Pass RHR Spray Hdr 1A Isin Viv 235-14A 1-FCV-72-40-A (3-9HP) N/A N/A N/A N/A 87.66 Pass RHR Hx 1A Bypass Vlv 235-14E 1-FCV-74-33-A (2HP) N/A N/A N/A N/A 85.27 Pass AFW Pmp A-A Lube Oil Pmp A-A 235-4E 1-MTR-3-1180-A (0.25HP) N/A Manual N/A Manual 89.72 85 480V RMOV Board IA2-A 480V ld Rm IA A/C Compressor 1A-1 236-17E 1-MTR-31-465-A ('0hp) N/A Running N/A Running 92.10 85 ERCW Hdr A Isin v 236-2A 1-FCV-3-116 (0.25hp) N/A Random N/A Random. 83.47 Pass ERCW Hdr A Isin Mv 236-3A 1-FCV-3-136 40.33hp) N/A Random N/A Random 84.05 Pass St Gen No 1 FW IsIn Viv Use 89-10 Use 89-10 236-3D 1-FCV-3-33-A (39.4hp). 81.91 start 82.72 start 83.23 Pass St Gen No 3 FW Isin Vlv Use 89-10 Use 89-10 236-4D 1-FCV-3-87 (39.4hp) 79.1 start 79.87 start 80.53 Pass Lwr Cntmt Cit 1A Disch Iso VCv loses 236-7D 1-FCV-67-87-A (0.13hp) N/A Not Running 84.68 (Starts) 86.96 Pass Upr Cntm Vt CIr 1A Sup IsoVIv Closes 236-7F 1-FCV-67-130-A (0.13hp) N/A Not Running 82.31 (Starts) 84.53 Pass Lwr Cntmt 1A CarSply IsIn VIv roses 236-88 1-FCV-67-107-A (0.33hp) N/A Not Running 85.33 (Starts) 87.62 Pass Lwr Cntmt 1C ar Disch [so Viv Closes 236-SD 1-FCV-67-95-A (O.13hp) N/A Not Running 84.43 (Starts) 86.71 Pass Upr Cntm Vt OIC Sup Iso VIv Closes 236-8F 1-FCV-67-133-A (0.13hp) N/A Not Running 81.23 (Starts) 83.44 Pass Lwr Cntmt 1C Ctr Sply sin Vlv rdoses 236-9A 1-FCV-67-99-A (0.33hp) N/A Not Running 85 (Starts) 87.30 Pass Lwr CNTMT 1B CLRDISCH ISO VLV os 236-98 1-FCV-67-104-A (0.33hp) N/A Not Running 85.36 (Starts) 87.65 Pass Up Cntmt VT ar 1A Disc Iso Viv loses 236-90 1-FCV-69-295 (0.l3hp) N/A Not Running 79.83 (Starts) 81.98 Pass Page 6 of 27

Calc. STUDY-EEB-WBN-12-001 Appendix A Rev. 0 I

1A Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation (SI-A or SI-Bl and Individual Motor Starts SI Phase A SI Phase B Minimum Required DBE Actuation OBE Actuation Individual Motor Start Voltage Terminal Voltage 1%) Terminal Voltage (%) Terminal Voltage I(%) Terminal Voltage V(%)

6.6kV/460V

-ETAP Bus ID/

Compt No Load Description 6.6kV/460V Base SI Phase A 6.6kV / 460V Base SI Phase B 6.6kV /460V Base Base Upr Cntm Vt CIr 16 Sup Iso VIv Closes 236-9F 1-FCV-67-139-A (0.13hp) N/A Not Running 81.23 (Starts) 83.44 Pass Lwr Cntmt 10 Or Disch Iso VIv Closes 236-1OA 1-FCV-67-112-A (0.33hp) N/A Not Running 85.41 (Starts) 87.70 Pass UP CNTM VT CLRIC DISH ISO VLV es 236-10D I-FCV-67-296-A (0.13hp) N/A Not Running 81.28 (Starts) 83.47 Pass UP CNTM VT CLR1D DISH ISO VLV Closes 236-10F 1-FCV-67-142-A (0.13hp) N/A Not Running 82.31 (Starts) 84.53 Pass RCP Thrm Barr Rtn Cntm Iso VIv Closes 236-11D 1-FCV-70-90-A (O.7hp) N/A Not Running 85.99 (Starts) 88.28 Pass RCP Thrm Barr Cntmt Isln Vlv oses 236-IIE 1-FCV-70-133-A (0.13hp) N/A Not Running 83.79 (Starts) 86.06 Pass RCP Oil Clr Rin Cntmt Isin Viv Closes 236-12D 1-FCV-70-92-A (0.13hp) N/A Not Running 85.07 (Starts) 87.37 Pass Excs Itdn- Hx Cont Inlt Iso Viv Closes on Closes on 236-16D 1-FCV-70-143-A I0.33hp) 83.8 Phase A 84.63 Phase A 86.91 Pass ERCW Hdr A IsIn Viv 236-28 1-FCV-3-116B-A (0.25HP) N/A N/A N/A N/A 83.47 Pass AFWP Turb Stm Sup Fm Stm Gen 1 236-2D 1-FCV-1-15-A (1HP) N/A N/A N/A N/A 92.47* Pass St Flow To AFWP Turb Isin Viv 236-2E 1-FCV-1-17-A (1HP) N/A N/A N/A N/A 88.75 Pass ERCW Hdr A IsIn VIv 236-3B 1-FCV-3-136B-A (0.33HP) N/A N/A N/A N/A 84.05 Pass St Gen No 1 FW Isin Viv 236-3D 1-FCV-3-33-A (39.4HP) 81.91 82.72 83.23 Pass Sample Hx Isln Viv 236-SA 1-FCV-70-215-A (0.13HP) N/A N/A N/A N/A 86.04 Pass Cntmt Spray Hx 1A Sup Cant Viv 236-SE 1-FCV-67-125-A (0.33HP) N/A N/A N/A N/A 92.51* Pass Cntmt Spray Hx 1A Oisch VIv 236-SF 1-FCV-67-126-A (0.33HP) N/A N/A N/A N/A 92.19' Pass AFWP Turb St Sply Frm St gen 4 236-6A 1-FCV-1-16-A (1HP) N/A N/A N/A N/A 92.52' Pass Page 7 of 27

Calc. STUDY-EEB-WBN-12-001 Appendix A Rev. 0 1A Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation (SI-A or SI-B) and Individual Motor Starts SI Phase A SI Phase B Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage V(%)

ETAP Bus ID/ LodDsrpinS PaeAS hs 6.6kV/4-60V Compt No Lad Description 6.6kV / 460V Base Si Phase A 6.6kV / 460V Base SI Phase 6.6kV /460V Base Base RHR Sys Isin Bypass Viv 236-6D 1-FCV-74-8-A (1.6HP) N/A N/A N/A N/A 90.99* Pass Cmpnt Cig Hx ADlsch Cont Vlv 236-11A 1-FCV-67-146-A (0.3HP) N/A N/A N/A N/A 87.97 Pass SS&Con AlrCpsr Sup Hdr A Iso V 236-12B D-FCV-67-205-A (0.33HP) N/A N/A N/A N/A 87.76 Pass CCS HX AERCW BYPASS FCV 236-ISA 1-FCV-67-143-A (0.13HP) N/A N/A N/A N/A 84.52 Pass RHR Hx A-A Outlet Vlv 236-16E 1-FCV-70-156-A (0.33HP) N/A N/A N/A N/A 88.75 Pass Sample Hx Hdr Outlet Vrv 236-17A I1-FCV-70-183-A (0.13HP) N/A N/A N/A N/A 85.99 Pass SFPCS Hx Sply Hdr Isln Viv 236-17B O-FCV-70-197-A (0.3HP) N/A N/A N/A N/A 89.63 Pass 480V Reac Vent Board IA-A None II _II

This MOV terminal voltage is calculated taking credit for the hammer blow feature.

Page 8 of 27

Caic. STIJDY-EEB-WBN-12*001 Appendix A Rev. 0 1B Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DRE Actuation ISI-A or S1-8) and Individual Motor Starts SI Phase A SI Phase B Minimum Required DBEActuation DBE Actuation Individual Motor Start Voltage Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage V(%)

ETAP Bus ID/ 6.6kV / 460V Compt No Load Description 6.6kV / 460V Base Si PhaseA 6.6kV / 460V Base SI Phase B 6.6kV / 460V Base Base 5.9kV Shutdown Board 18-B Aux Feedwater PMP 1a-B 13-10 AfW 1-MTR-3-128-B (600 HP) 99.02 Starts 99.02 Starts 98.97 85 CNTMT SPRAY PMP 12-B 13-13 CSP 1-MTR-72-10-B (700 HP) N/A Not Running 98.7 Start 98.69 80 RHR PUMP 19-B 13-14 RHR 1-MTR-74-20-B (400 HP) 99.12 Starts 99.12 Starts 99.12 80 SAFETY INJPMP 11-B 13-15 SI 1-MTR-63-15-B (400 HP) 98.85 Starts 98.85 Starts 98.85 80 CNTFGL CHRG PMP 1-B 13-18 CCP 1-MTR-62-104-B (600 HP) 98.77 Starts 98.77 Starts 98.77 80 Starts ( F-B oe Starts F-B or E-Bstart, but E-Bstart, but not both, not both, ERCW PMP F-B other Is not other is not 13-8 ERCW 0-MTR-67-51-B (800 HP) N/A running) N/A running) 96.20 90 Starts ( E-8 o Starts I E-B or F-Bstart, but F-Bstart, but not both, not both, ERCW PMP E-B other Is not other Is not 13-9 ERCW 0-MTR-67-47-B (800 HP) 95.11 running) 95.11 running) 95.01 90 480V Shutdown Board 1B1-B Comp Cooling Sys Pump 19-B 129-3C 1-MTR-70-38-B (35Ohp) 80.88 Starts 81.52 starts 80.78 70 Elec Bd Rm AHU C-B 130-7A 0-MTR-31-31B-B (S0hp) N/A Running N/A Running 90.49 80 Reac Lwr Compt Cir Fan 19-B 130-70 1-MTR-30-7SoB (6Ohp) N/A Running N/A Trips 82.53 80 480V Shutdown Board 1B2-B Control Rm A/C B-BCompressor 131-28 G-MTR-31-96/2-B (250hp) N/A Running N/A Running 83.24 80 SHDN BD RM CHLR PKG 6-8 Compressor 131-3C 0-MTR-31-49/2-B (240hp) N/A Running N/A Running 87.99 85 Reac Lwr Compt CIr Fan 1D-B 132-70 1-MTR-30-78-B (60hp) N/A Running N/A Trips 83.00 80 Spent Fuel Pit Pmp B-B 132-9A 0-MTR-78-9-B i100hp) N/A Running N/A Running 84.80 go Not Running Not Running Cntmt Air Rtn Fan 19-B Starts @ 9 Starts @9 132-9C 1-MTR-30-39-B (100hp) N/A Min) N/A Mini 81.61 (SIB) 80 480V SD Bd Rm AHU C-B 132-9D 0-MTR-31-SS-B (7Shp) N/A Running N/A Running 88.01 85 480V C&A Vent Board 161-B I I Cent Bldg Emerg Press Fan 5-8, 205-11A 0-MTR-31-S-B (lhp) 87.9 Start 89.19 Start 92.26 85 Page 9 of 27

Calc. STUDY-EEB-WBN-12-001 Appendix A Rev. 0 1B Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for 0BE Actuation (SI-A or SI-B) and Individual Motor Starts SI Phase A SI Phase 8 Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage (%) Terminal Voltage 9% Terminal Voltage I(%) Terminal Voltage V(%)

ETAP Bus ID/ 6.6kV / 460V Compt No Load Description 6.6kV / 460V Base SI Phase A 6.6kV / 460V Base SI Phase B 6.6kV / 460V Base Base ERCW Scrn Wash Pump 1B-B 205-13D 1-MTR-67-440-8 (40hp) N/A N/A N/A N/A 73.64 (SIB) 75 Cont Bldg Em Air Clnup Fan B-B 205-2A 0-MTR-31-7-B (10hp) 86.62 Start 87.89 Start 89.94 85 Cntmt Spray Pump 18-B Rm CUrFan 205-3C I-MTR-30-178-B V7.5hp) N/A Random 88.51 Starts 89.81 80 Emerg Gas Tflmt SysFan B-B 205-4D 0-MTR-65-42-B (20hp) 85.41 Start 86.66 Start 89.23 80 ERCW Str 18-B 205-68 1-MTR-67-10-8 (3hp) N/A Running N/A Running 77.45 75 RWST to Spray Hdr 1A Viv Stopped (No Stopped (No 205-7E I-FCV-72-22 (3.2hp) N/A auto Start) N/A auto Start) 88.06 (SIB) Pass ERCW Str 1B-B Backwash Vlv 205-4E 1-FCV-67-1OA-B (0.33HP) N/A N/A N/A N/A 82.38 80 ERCW Str 18-B Flush VIv 205-6E 1-FCV-67-10B-B (0.33HP) N/A N/A N/A N/A 82.39 80 RHRPMP 12-B INLET FCV 205-7D I-FCV-74-21-B (5.2HP) N/A N/A N/A N/A 91.00 Pass Pen Rm El713 Clr Fan 1-B 205-2C 1-MTR-30-197-B (3HP) 86.49 Start 87.77 Start 91.08 80 Shdn Bd Rm Chir CW Cir Pmp B-B 205-3A O-MTR-31-49/1-B (Z5HP) N/A N/A N/A N/A 90.81 85 Pipe Chase Cir Fan 1B-B 205-38 1-MTR-30-202-B (3HP) 85.35 Start 86.6 Start 89.47 80 Cntmt Bldg Upper Compt Air Mon 205-3F1 1-RE-90-112-B (3HP) N/A N/A N/A N/A 90.10 85 Battery Rm El692 Exh Fan B-B 205-4A 0-MTR-31-29-8 (1.SHP) N/A N/A N/A N/A 88.13 85 CNTMT PURGE AiR EXHMON 205-4F1 1-RE-90-131-B (0.7SHP) N/A N/A N/A N/A 93.34 85 SFP PmpB-B&TB Bst Pmp SpCdrFan 205.5A O-MTR-30-193-B (7.SHP) 85.14 Start 86.39 Start 89.28 80 CCS & AFW Pumps Sp CIr Fan B-B 205-5E 1-MTR-30-191-B (20HP) 85.45 Start 86.71 Start 89.06 80 SHUTDOWN BDRM A PRESS FAN C-B 205-1A D-MTR-31-67-B (3HP) N/A N/A N/A N/A 92.26 85 Traveling Scm 18-B 205-6C 1-MTR-67-445-B (SHP) N/A N/A N/A N/A 80.73 (SIB) 80 125V VtI Bat Rm I Ex Fan 1A2-B 205-78 1-MTR-31-288-8 (0.33HP) N/A N/A N/A N/A 91.84 85 High Press Fire Prmp Str B-B 205-7C 0-MTR-26-14-B (0.75HP) N/A N/A N/A N/A 87.47 85 Safety InJProp 1B-B Rm Cir Fan 205-8A 1-MTR-30-179-B (5HP) N/A N/A N/A N/A 86.70 80 Page 10 of 27

Calc. STUDY-EEB-WBN-12-O01 Appendix A Rev. 0 1B Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage RpsuInt* Shnwn fnr fiPRAr-tiaitinn riI-A nr Si-Rl .and lnInhlid4mliMntnr %t:*rt; SI Phase A SI Phase B Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage V(%)

E'TAP Bus ID/ I6.6kV / 460V Compt No Load Description 6.6kV / 460V Base SI Phase A 6.6kV 460V Base SI Phase B 6.6kV / 460V Base Base

.... .. Pen PRmEl 692 Or* fan 18-8 205-BB 1-MT,-30-187-B (3HP) N/A N/A N/A N/A 90.19 80 Shtdn Xlmr Rm 18 Exh Fan 102--B 205-BC 1-MTR-30-248F-B (3HP) N/A N/A N/A N/A 90.62 go Shtdn Xfmr Rm 1B Exh Fan 1B3-205-8D 1-MTR-30-248G-B (3HP) N/A N/A N/A N/A 90.57 80 Cont Rmn A/C Cir Pmp B-B 205-SE 0-MTR-31-9611-B 1SHP) N/A N/A N/A N/A 86.05 85 CONT RM A/C B-B CONTROL/O.PMP 205-BF1 0-MTR-31-96/3-B (3HP) N/A N/A N/A N/A 92.45 85 RHR Prop 1B-B Rm Or Fan 205-9A 1-MTR-30-176-B (SHP) 82.05 Start 83.25 Start 84.16 80 5th Viii Bait Rm Exh Fan 182-B 205-9B O-MTR-31-495B-B (0.25HP) N/A N/A N/A N/A 94.51 85 480V Bd Rm 1A Pr Sup Fan 1A2-B 205-9C t-MTR-31-463-B (3HP) N/A N/A N/A N/A 93.17 85 Shtdn Xfmr Rm 18 Exh Fan 151-B 205-90 1-MTR-30-248E-B (3HP) N/A N/A N/A N/A 83.36 80 Pen PKiEi737 ar Fan LB-B 205-9E 1-MTR-30-195-B (3HP) 86.32 Start 87.58 Start 90.44 80 Cntfg Chrg Prop 18-B Rm Or Fan 205-IOA 1-MTR-30-182-B (SHP) 83.54 Start 84.77 Start 86.23 80 480V Bd Rm IN Pr Sup Fan 162-B 205-108 1-MTR-31-477-B (3HP) N/A N/A N/A N/A 93.09 85 225V VTLBATRM IIEXFAN 182-B 205-10C 1-MTR-31-286-B (0.33HP) N/A N/A N/A N/A 91.87 85 Cont Rm Intake Mon 205-IOFI 0-RE-9D-20B-B (0.75HP) N/A N/A N/A N/A 90.47 85 480V Bd Rm 18 A/C Ahu 1B-B 205-118 1-MTR-31-475-B 120HP) N/A N/A N/A N/A 90.26 85 480V Bdkm P 2B/AC Cond 18-B 205-11C 1-MTR-31-289-B (20HP) N/A N/A N/A N/A 92.28 85 Cont Rm Ahu &-B 205-11D 0-MTR-31-11-B (60HP) N/A N/A N/A N/A 88.49 85 480V C&A Vent Board 182-B None I 480/VDiesel Aux Board 181-B DG 18-6 RM EXHFAN 1-B 219-28 1-MTR-30-449-B (15hp) 89.74 Starts 90.34 Start 91.72 85 DG18-B DAYTNXFO XFR PMP 1 219-30 1-MTR-18-55/2-B (lhp) 89.78 Random 90.4 Random 94.00 85 DS1B-B Aux LubeOtl Circ Pmp A 219-4B 1-MTR-82-AOPA2B (0.75hp) 90.42 Start 91.03 Start 94.24 85 DG18-B Muffler Pm Exh Fan 219-6A I-MTR-30-465 (0.5hp) 90.2 Starts 90.81 Starts 94.71 85 Dg 1B-0 Lube OUi rcPmp I 219-20 1-MTR-82-BS-B (1HP) N/A N/A N/A N/A 94.04 85 DG18-B 480V ELECBDRM EXFAN 219-4E 1-MTR-30-461-, I2HP) N/A N/A N/A N/A 93.87 85 Page 11 of 27

Catc. STUDY-EEB-WBN-12-001 Appendix A Rev. 0 1B Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation (SI-A or SI-B) and Individual Motor Starts SI Phase A SI Phase B Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage % _ Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage V(%)

ETAP Bus ID/ 6.6kV I 460V Compt No Load Description 6.6kV / 460V Base APhase 5i A 6.6kV / 460V Base SI Phase B 6.6kV / 460V Base Base 480V Diesel Aux Board 1B2-B '

DG WO-B Rm Exh Fan 2-B 220-28 1-MVMTR-30-453-B (15hp) 91.34 Starts 91.81 Start 92.66 85 B-BWDAYTNKFOXFRPMP2.

220-3D J1-MTR-18-54/2-B (1HP) 91.15 Start 91.62 Start 94.87 85 D) 1B-B Aui LubeO I Lrc Pmp B 220-2A I-MTR-82-AOP829 (O.75HP) N/A N/A N/A N/A 94.39 85 bg 9B-B Lube Oil Circ Pmp2 220-2D 1-MTR-82-B2-BI(1HP) N/A N/A N/A N/A 94.77 85 4MOV RMOV Board 1B1-B ISOACCUM TANK FLOW ISOL VLV Opens on SI Opens on SI 237-3F2 I-FCV-63-98-R (1.6hp) 90.26 (Starts) 91.57 (Starts) 95.10 Pass Seal Flow Ret Isln Vie Closes on Ph Closes on Ph 237-613 1-FCV-62-61-B (1.9hp) 80.78 A (Starts) 81.93 A (Starts) 85.36 Pass CiHRGFLOW ISLN VILV Closes on Si Closes on SO 237-7A E-FCV-62-91-B (1.9hp) 83.3 (Starts) 84.49 (Starts) 88.02 Pass Vol Cont Tank Outlet Isln Vi Closes on i Closes on SI 237-SA 1-LCV-62-133-B (1.ghp) 80.92 (Starts) 82.08 iStarts) 8S.50 Pass FIWST To Charging Pmp Viv Cont opens on Opens on SI 237-88 1-LCV-62-136-B (1.ghp) 78.63 (Starts) 79.76 (Starts) 83.09 Pass SIS 1A-A DSHTO RWST SHTFF VLV Not Running Not Running 237-IOA 1-FCV-634-B (O.7hp) N/A or Starting N/A or Starting 84.57 Pass RWST To SIS Pump Flow Cont Viv Not Running Not Running 237-108 1-FCV-63-5-B (1.ghp) N/A or Starting N/A or Starting 88.02* Pass SIS PMP INLTTO CVCSCHRG PMP Not Running Not Running 237-11A 1-FCV-63-6-BI(.9hp) N/A or Starting N/A or Starting 88.211 Pass SIS Boron Inj Tank Shutoff Viv Opens on SI Opens on SI 237-11E 1-FCV-63-25-B (1.ghp) 82.06 (Starts) 83.24 (Starts) 86.70 Pass SIS Pmp IB-B Inlet VIv Not Running Not Running 237-128 1-FCV-63-48-B (1.9hp) N/A or Starting N/A or Starting 90.230 Pass g1pe--s at 'upensat CNTMTSUMPTO RHR PMP B-B approx. 20 approx. 20 237-12D 1-FCV-63-73-B {13hp) min min 88.03 Pass Cntmt Spray Hdr 1 Isin Viv Closed, Not Opens, 237-14A 1-FCV-72-2-B (3.2hp) N/A Running 92.89* (5s) Starting. 92.86* Pass RHR Pmp 1B-B MIn Flow Viv 237-158 1-FCV-74-24-B (0.13hp) 78.73 Random 79.87 Random 83.27 Pass FW Prp B-Blube Oil Prp B-B 237-17D 11-MTR-3-128D-B (0.25HP) N/A N/A N/A N/A 89.84 85 Page 12 of 27

Catc. STUDY-EEB-WBN-12-001 Appendix A Rev. 0 1B Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for D8E Actuation (5I-A or SI-Ri and Individual Motor Start*

DBEt honfrDB Actuation cut Blan Actviuatinldvda Motor StartsVltg SI Phase A S Phase B Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage ETAP Bus ID/

Compt No Load Description Terminal Voltage (%)

6.6kV / 460V Base 1 _

SI Phase A Terminal Voltage (%)

6.6kV / 460V Base SI Phase B Terminal Voltage 1%)

6.6kV / 460V Base Terminal VoltaMe VN%

6.6kV /I460V Base RCSPress Relief Flow Cont Vlv 237-5E 1-FCV-68-332-6 (1.9HP) N/A N/A N/A N/A 88.06* Pass RHRTo RCS H.L 1&3 Flow Iso V 237-9B 1-FCV-63-172-B (2.6HP) N/A N/A N/A N/A 85.99 Pass Cont Spray Pmp 1-B Recirc FCV 237-9F1 -FCV-72-13-8 (0.13HP) N/A N/A N/A N/A 90.08" Pass RHR Hx B To SIS Pmp 237-118 I.FCV-63-11-B (2HP) N/A N/A N/A N/A 85.71 Pass SISTo RCS Loops 1&4 FCV 237-12E 1-FCV-63-94-B (1.6HP) N/A N/A N/A N/A 90.63 Pass SISProp 18-B Outlet FCV 237-13A I-FCV-63-153-B (1.9HP) N/A N/A N/A N/A 88.750 Pass SIS PMP OUT RCSLP 2&4 H.LEG 2374138 1-FCV-63-157-B (1.9HP) N/A N/A N/A N/A 91.36' Pass SIS 18-8 Dsh To RWSTShtff VIv 237-13D 1-FCV-63-175-B (0.7HP) N/A N/A N/A N/A 84.70 Pass RHR Spray Hdr 16 IsIn Vlv 237-140 1-FCV-72-41-B (1.9HP) N/A N/A N/A N/A 85.82 Pass Cntmt Sump To Spray Hdr 18 FCV 237-14E 1-FCV-72-45-B (3.2HP) N/A N/A N/A N/A 89.68' Pass RHRHx iB Bypass Viv 237-15D I-FCV-74-35-B (1.9HP) N/A N/A N/A N/A 83.01 Pass 480V RMOV Board 102.-13 ERCW Hdr B Isin VIv 238-2A I-FCV-3-126A-B (0.25hp) N/A Random N/A Random 82.91 Pass ERCW Hdr B Isln Viv 238-3A 1-FCV-3-179A-B (0.33hp) N/A Random N/A Random 83.46 Pass ST GEN NO 2 FW ISLNVLV 238-30 1-FCV-3-47-B (39.4hp) 80.6 start 81.37 start 82.84 Pass St Gen No 4 FW IsIn Vlv Use 89-10 Use 89-10 238-40 1-FCV-3-100-B (39.4hp) 80.6 start 81.38 start 82.84 Pass LWR CNTMT 1A CLRSISLN VLV Closes 238-SC I.FCV-67-113-B (0.13hp) N/A Not Running 81.98 (Starts) 85.37 Pass RCP Thrm Bar Rtn ntmt [so Vlv os 238"6D 1-FCV-70-87-8 (0.7hp) N/A Not Running 84.13 (Starts) 87.57 Pass Page 13 of 27

Caic. STUDY-EEB-WBN-12-O01 Appendix A Rev. 0 1B Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Limit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBF Actuation (SI-A or SI-RI and Individual Mntnr Stzsrft Results Shown.... .. ..... n.. * ....-. . _r __.........................

SI Phase A SI Phase 8 Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage V(%)

fTAP Bus I 6.6kV / 460V Compt No Load Description 6.6kV / 460V Base SI Phase A 6.6kV / 460V Base SI Phase 8 6.6kV / 460V Base Base RCP THRM BARCNTMT ISO VLV Closes 238-6E 1-FCV-70-134-8 (0.13hp) N/A Not Running 82.29 (Starts) 85.70 Pass Lwr Cntmt 113Cir Dish iso VW - Cwse 238-70 L-FCV-67-103-a aO.13hp) N/A Not Running 82.76 (Starts) 86.18 Pass Up CntI Vt lr LADish Iso Viv Uoses 238-7F I-FCV-67-131-E(0.13hp) N/A Not Running 80.6 (Starts) 83.94 Pass Lwr Cntmt 10 Cir Dish Iso VIv Uoses 238-80 J-FCV-67-111-B (O.13hp) N/A Not Running 83.07 (Starts) 86.50 Pass Up ntmvtCr lCDis o Vv Closes 238-8F 1-FCV-67-134-8 (0.13hp) N/A Not Running 80.56 (Starts) 83.90 Pass Lwr Cntmt 1A CIr Dish Iso Viv Cl 238-9A L-FCV-67-88-B (0.33hp) N/A Not Running 83.67 (Starts) 87.12 Pass Lwr Cntmt IC Cir Dish Iso Viv Cvoses 238-98 1-FCV-67-96-B (0.33hp) N/A Not Running 83.79 (Starts) 87.25 Pass Up Cntm Vt Cir18 Dish Iso Viv oses 238-9D 1-FCV-67-297-B (0.13hp) N/A Not Running 81.45 (Starts) 84.82 Pass up Coon Vt CIr 18 Sup Iso VIv Closes 238-9F 1-FCV-67-138-B (0.13hp) N/A Not Running 80.S (Starts) 83.84 Pass Lwr Cntmt 1 CUrSply IsIn VIv Closes 238-10A 1-FCV-67-91-B (0.33hp) N/A Not Running 83.71 (Starts) 87.16 Pass Lwr Cntmt 10 Cir Sply IsIn Viv Eloses 238-108 1-FCV-67-83-B (0.33hp) N/A Not Running 84.28 (Starts) 87.77 Pass UP CNTM VTCUR2D DIS ISO VLV closei 238-10D 1-FCV-67-298-B (0.13hp) N/A Not Running 80.09 (Starts) 83.41 Pass Up Cntm Vt CIr W)sup Iso VIv Closes 238-IOF 1-FCV-67-141-B (0.13hp) N/A Not Running 80.89 (Starts) 84.23 Pass

.WR-loses CNTMT 1C CIR5ISLN VLV 238-11D 1-FCV-67-105-B (0.13hp) N/A Not Running 81.73 (Starts) 85.11 Pass RCP OiCltr Rtn Cntnt Isln VIv 238-13D I-FCV-70-89-B (0.13hp) N/A Not Running 83.41 (Starts) 86.85 Pass RCP Oil Or Hdr Cntmt isin VIv Closes 238-13F 1-FCV-70-140-B (0.33hp) N/A Not Running 83.59 (Starts) 87.05 Pass 480V Bd Rm 16 AIC Cprsr 11-B 238-180 1-MTR-31-447-B (75HP) N/A N/A N/A N/A 89.25 85 ERCW Hdr B IsIn VIv 238-2B 1-FCV-3-1268-B(O.25HP) N/A N/A N/A N/A 88.81 . Pass St Flow To AFWP Turb Isin VIv 238-2E 1-FCV-1-18-B 1iNP) N/A N/A N/A N/A 92.50 Pass ERCW Hdr B Isin Viv 238-3B 1-FCV-3-1798-6 (0.33HP) N/A N/A N/A N/A 83.47 Pass Cntmt Spray HxIB Sup Cont Viv 238-SE 1-FCV-67-123-B (0.33H P) N/A N/A N/A N/A 92.08* Pass Page 14 of 27

Calc. STUDY-EEB-WBN-12-001 Appendix A Rev. 0 1B Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Limit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Recmit; _hnwn fnr flRF Art,,2tlnn (I.A nr ;I-Ri :ind Inrfhididm*l Mntnr *t~rtc S1Phase A SI Phase B Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage M%) Terminal Voltage ETAP Bus ID/ Terminal T%) Voltage (%) 7 60 V(%)

6.6kVVoltae Terminal Compt No Load Description 6.6kV 460V Base SI Phase A 6.6kV / 460V Base SI Phase B 6.6kV / 460V Base Base Cntmt Spray Hx18 Disch Vlv 238-SF l-FCV-67-124-B (n.33HP) N/A N/A N/A N/A 91.73* Pass STA S &C ACSUP HDR B ISO VLV 238-110 O-FCV-67-208-B (O.33HP) N/A N/A N/A N/A 91.28* Pass UCSHX BERCW BYPASS FCV 238-17D O-FCV-67-144-B (0.I3HP) N/A N/A N/A N/A 84.29 Pass igOV Reac Vent Board 1B-B None T

This MOV terminal voltage is calculated taking credit for the hammer blow feature.

Page 15 of 27

Calc. STUDY-EEB-WBN-12-001 Appendix A Rev. 0 2A Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation SI-A or Si-B) and individual Motor Starts 51Phase A 5i PhaseB Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage (%) Terminal Voltage 1%) Terminal Voltage (%) Teminal voltage V(%)

ETAP Bus ID/ 6.6kV /460V Compt No Load Description 6.6kV / 460V Base SI Phase A 6.6kV / 460V Base SI Phase B 6.6kV / 460V Base Base 6.9KV Shutdown Board 2A-A 14-10 AFW AUX FEEDrWTR PMP 2A-A 2-MTR-3-118-A (600hp) 98.97 Starts 98.97 Starts 98.96 85 14-13 CSP CNTMT SPRAY PMP 2A-A 2-MTR-72-27-A (700hp) N/A Not Running 98.62 Start 98.60 80 14-14 RHR RHR PMP 2A-A 2-MMTR-74-10-A (400hp) 99.08 Starts 99.08 Starts 98.84 80 14-15 SI SAFETY INJPMP 2A-A 2-MTR-63-20-A (400hp) 98.84 Starts 98.84 Starts 98.83 80 14-18 CCP CNTFGL CHRG PMP 2A-A 2-MTR-62-108-A (600hp) 98.67 Starts 98.67 Starts 98.80 80 14-8 ERCW Starts ( D-A Starts ( D-A or C-A start, or C-A start, but not both, but not both, ERCW PMP D-A other Isnot other Isnot O.MTR-67-40-A (800hp)

_ N/A running) N/A running) 96.59 90 14-9 ERCW Starts ( D-A Starts (D-A or C-A start, or C-A start, but not both, but not both, ERCW PMP C-A other Isnot other Is not 0-MTR-67-36-A (800hp) 96.67 running) 96.67 running) 96.61 90 480V Shutdown Board 2A1-A

- Cnpnt Cig Sys Pmp 2A-A 133-3B 2-MTR-70-S9-A (350hp) 81.46 Running 81.66 Running 81.05 70 WoTRun8ning iot Rtunning Cntmt Air Rtn Fan 2A-A Starts @ 9 Starts @ 9 134-10C 2-MTR-30-38-A (100hp) N/A Min) N/A MIn) 83.19 (SIB) 85 Reac Lwr Compt Or Fan 2A-A 134-7C 2-MTR-30-74-A (60hp) N/A Running N/A Trips 85.18 80 Elec Bd Rm AM4U B-A 134-9C 0-MTR-31-30D-A (50hp) N/A Running N/A Running 83.35 80 480V Shutdown Board 2A2-A Elec Bd Rm A/C A-A Cprsr 135-2C 0MTR-31-128/2-A (250hp) N/A Running N/A Running 86.41 85 SHDN BDRMCHLR PKG A.A CPRSR 135-3C 0-MTR-31-36/2-A {240hp) N/A Running N/A Running 92.01 85 REACLWR COMPT CLRFAN 2C-A 136-7D 2-MTR-30-77-A (60hp) N/A Running N/A Trips 82.60 80 480V SHUTDOWN BDRM AHU B-A 136-8D D-MTR-31-44-A (7Shp) N/A Running N/A Running 87.42 85 Spent Fuel Pit Pmp A-A 136-9D O-MTR-78-12-A 1100hp) N/A Running N/A Running 83.94 (SIB) 80 480V Reactor Vent Board 2A-A None I 480V C&A Vent Board 2A1-A I I I II Page 16 of 27

Calc. STUDY-EEB-WBN-12-001 Appendix A Rev. 0 ZA Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation (SI-A or SI-B) and Individual Motor Starts SI Phase A SI Phase B Minimum Required DBE Actuation DOBEActuation Individual Motor Start Voltage Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage V0%)

ETAP Bus ID/ 6.6kV / 460V Compt No Load Description 6.6kV / 460V Base SI Phase A 6.6kV / 460V Base SI Phase B 6.6kv / 460V Base Base Cntfg Chrg Pmp 2A-A Rm COrFan 207-IOA 2-MTR-30-183-A (SHP) 83.11 Starts on Si 80.62 Starts on S5 83.43 80 Pen Hm El713 COrFan 2A-A 207-10B 2-MTR-30-196-A (3HP) 86.84 Starts on Si 84.23 Starts on SI 90.72 80 Pipe Chase Cir Fan 2A-A 207-IOC 2-MTU-30-201-A (3HP) 84.53 Starts on SI 82 Starts on S 87.16 80 ABGTS HUM HTR A-A Starts on ABI Starts on ABI 207-10D O-HTR-30-147-A (SO.008kW) N/A (from SI) N/A (from Si) N/A Static Load 480V 8d Rm 26 Pr Sup Fa21-A 207-IIA 2-MTR-31-478-A (3HP) N/A Running N/A Running 92.42 85 480V 5d Rm 2A A/C Ahu 2A-A 207-1IC 2-MTR-31-461-A (10HP) N/A Running N/A Running 88.58 85 125V Vital Bat Rm IIIEx Fan 251-A 207-12A 2-MTR-31-285-A (O.33HP) N/A Running N/A Running 91.5 85 480V ld Rm 2A A/C Cond 2A-A 207-12C 2-MTR-31-290-A (15HP) N/A Running N/A Running 91.03 85 Cntmt Purge Air Radn FAxh Mon 207-12F1 2-RE-90-130-A (0.75HP) N/A Running N/A Running 94.19 85 ERCW SCREEN WASH PUMP 2A-A 207-13D 2-MTR-67-437-A (40HP) N/A Running N/A Running 77.36 (SIB) 75 AUX CONTROL AIR COMPRESSOR A-A 207-2A 0-MTR-32-60-A (20hp) N/A Not Running N/A Not Running 84.00 80 Pen Rm El692 COrFan 2A-A 207-2C 2-MTR-30-1W-A (3HP) 84.03 Starts an SI 81.51 Starts on SI 86.41 80 Shdn Bd Rm ChIr CW Or Pmp A-A 207-3A 0-MTR-31-36/1-A (25HP) N/A Running N/A Running 86.13 85 Cntm Spray Pmp 2A-A Rm Or Fan Starts on 207-3C 2-MTR-30-177-A (7.SHP) N/A Running 80.79 Phase B 86.61 80 Aux BIDG Gas Trtmt Sys Fan A-A starts On ABI 207-3D 2-MTR-30-146-A 150hp) 83.58 Ifrom SO) 81.08 Starts OnABI 89.01 80 EGTrtmt Sys A-A Rm COrFan starts on AlI Starts on ABI 207-4A 2-MTR-30-200-A (3HP) 85.94 (from S) 83.35 (from SI) 90.81 80 ERCW Stf 2A-A backwash Vlv 207-4E 2-FCV-67-9A-A (0.33HP) N/A N/A N/A N/A 83.30 80 AFW & BAXFRSPACE CLRFAN A-A Starts on ABI Starts on ABI 207-SE 2-MTR-3D-1B4-A (15HP) 86.9 (from SI) 84.29 (from Si) 90.70 80 ERCW Str 2A-A 207-68 2-MTR-67-9-A (3HP) N/A Running N/A Running 82.30 75 Traveling Scm 2A-A 207-6C 2-MTR-67-439-A (SliP) N/A N/A N/A N/A 81.27 80 12SV VITBAT RM IV EXFANZAI-A 207-78 2-MTR-31-287-A (0.33HP) N/A Running N/A Running 91.86 85 Safety InJProp 2A-A Rm CIr Fan Starts on Starts on 207-8A 2-MTR-30-180-A (SHP) 85.07 (2s) Pump Start 82.96(2s) Pump Start 82.09 80 Pen Rm El737 Or Fan 2A-A Starts on ABI Starts on ABI 207-8B 2-MTR-30-194-A (3HP) 87.49 (from SI) 84.86 (from SI) 92.26 80 Page 17 of 27

Calc. STUDY-EEB-WBN-12-001 Appendix A Rev. 0 t

ZA Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytcal Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage 1;. U I d SIPhase A SIPhase B Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage V(%)

ETAP Bus ID/ 6.6kV / 460V Compt No Load Description 6.6kV I 460V Base SI Phase A 6.6kV / 460V Base SI Phase B 6.6kV / 460V Base Base 480V Xfmr Rm 2A Exh Fan 2A2-A 207-8C 2-MTR-30-250F-A (3HP) N/A Running N/A Running 91.75 80 4oV XfRNr Rm 2A Esh Fan 2A3-A 207-80 2-MTR-30-250G-A (3HP) N/A Running N/A Running 91.75 80 EL go RM A[C A-A CONTROLIOPMP 207-8F1 D-MTR-31-128/3-A (3.11HP) N/A Running N/A Running 90.94 85 RHR Pmp 2A-A Rm Or Fan 207-9A 2-MTR-30-175-A (5HP) 85.43 (2s) Starts on Si 82.57 (2s) Starts on Si 81.91 80 E6BIG Ee BdRe m AC CIr Pmp A-A 207-98 0-MTR.31.128/1-A (20HP) N/A Running N/A Running 87.98 85 480V Bd Rm 2A Pr Sup Fan 2A1-A 207-9C 2-MTR-31-462-A (3HP) N/A Running N/A Running 92.21 85 480V Xfmr Rm 2A Exh Fan 2A1-A 207-90) 2-MTR-30-250E-A (3HP) N/A Running N/A Running 91.39 85 Cont Rm Intake Mon 207-9F1 O-RE-90-125-A 10.75HP) N/A Running N/A Running 93.10 85 480V C&A Vent Board 2A2-A None I 480V Diesel Aux Board 2A1-A DG2A-A RM EX- FAN 1-A 221-25 2-MTR-30-448-A (15hp) 92.24 Starts 91.12 Start 93.75 85 DG2A-A Lube Oil Circ Pmp 1 221-2D 2-MTR-82-A1-A (lhp) N/A Running N/A Running 94.57 8s EM D0 ENG HX2A1 &2A2 SUP VLV 221-3A 2-FCV-67-66-A (0.13hp) 82.51 Starts 81.51 Starts 8S.79 Pass DG 2A-A DAYTNKFO XFR PMP 1 221-3D 2-MTR-18-S5/3-A (lhp) 91.5 Random 90.39 Random 94.63 85 DG2A-A Aux LubeOli lrc Pmp A 221-48 2-MTR-82-AOPAIA (0.7Shp) N/A Running N/A Running 94.82 85 rtars on Starts on DG2A-A Muffler Rm Exh Fan Diesel Start Diesel Start 221-6A 2-MTR-30464 (0.Shp) 91.94 from S1 90.81 from 51 94.77 85 OG Rm 2A-A Pni Vent Fan 221-4D 2-MTR-30-492-A (15HP) N/A N/A N/A N/A 92.14 85 2A-A 480V ELEC BDRM EXFAN 221-4E 2-MTR-30-460-A (2HP) N/A N/A N/A N/A 95.01 8S 480V Diesel Aux Board 2A2-A DG2A-A Aux LubeOil Circ Pmp a 222-2A 2-MTR-82-AOPBIA (0.7Shp) N/A Running N/A Running 94.86 85 DG lA-A RM EXHFAN 2-A 222-28 2-MTR-30-452-A (15hp) 92.65 Starts 92.94 Start 93.57 85 DG 2A-A Lube Oil irc Pmp 2 222-20 2-MTR-82-A2-A (lhp) N/A Running N/A Running 95.28 85 DG2A-A DAYTNKFO XFR PMP 2 222-3D 2-MTR-18-54/3-A (lhpI 92.22 Random 92.5 Random 95.28 85 480V RMOV Board ZAI-A u.lses Cntm Spray Pmp .A-A Recirc FCV shortly after 239-IOF j2-FCV-72-34-A (0.13hp) N/A Not Running 81.21 Phase B 83.80 Pass Page 18 of 27

Calc. STUDY-EEB-WBN-12-0O01 Appendix A Rev. 0 2A Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation (SI-A or SI-B) and Individual Motor Starts SI Phase A SI Phase B Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage V(%)

ETAP Bus ID/ 6.6kV / 460V Compt No Load Description 6.6kV / 460V Base Si Phase A 6.6kV] 460V Base SI Phase B 6.6kV / 460V Base Base sIS Boron Inj Tank Shutoff Viv Opens on SI Opens on SI 239-110 2-FCV-63-26-A (1.9hp) 84.83 (Starts) 82.23 (Starts) 84.04 Pass Operate upputrap about 20 about 20 Cntmt Sump To RHR Pmp A-A minutes after minutes after 239-128 2-FCV-63-72-A (13hp) N/A Si N/A SI 90.19 Pass Cntmt Spray Hdr 2A Isin Vlv Opens on Ph 239-13E 2-FCV-72-39-A (3.2hp) N/A Not Running 79.41 B(Starts) 85.41 Pass RHR Pmp 2A-A Min Flow VIv 239-14D 2-FCV-74-12-A (0.13hp) 84.39 Random 81.8 Random 84.61 Pass LWR CNTMT 2A CLRS SUP ISLNVLV Closes 239-15D 2-FCV-67-89-A (0.33hp) N/A Not Running 84.22 (Starts) 88.86 Pass Cntmt Standpipe Isin Viv 239-17B 2-FCV-26-240-A (0.67hp) 81.97 Close (Start) 79.45 Close (Start) 87.19 Pass RCP Spray Isin Viv 239-18E 2-FCV-26-243-A (0.67hp) 81.05 Close (Start) 78.55 Close (Start) 86.47 Pass Seal Flow Ret Isln VIv Closes on Ph Closes on Ph 239-7A 2-FCV-62-63-A (1.ghp) 77.73 A(Starts) 75.34 A (Starts) 81.71 Pass CHRG FLOW ISLNVLV 239-7B 2-FCV-62-90-A (L9hp) 85.01 Closes on SI 82.4 Closes on SI 88.88 Pass Vol Cont Tank Outlet Isin Vlv 239-8B 2-LCV-62-132-A (1.9hp) 79.79 Closes on Si 77.34 Closes on Si 84.75 Pass LWR CNTMT 2C CURS SUP ISLNVLV Closes 239-5C 2-FCV-67-97-A (0.33hp) N/A Not Running 84.01 (Starts) 88.15 Pass RWST TO CHARGING PMPS CONT Opens on SI Opens on SI 239-9A 2-LCV-62-135-A (1.ghp) 83.78 (Starts) 81.2 (Starts) 88.57 Pass 239-9D 2-FCV-70-100A (0.33hp) N/A Not Running 83.69 Phase B 94.38 Pass 5IS PMPS RECIRC TO RWST 239-108 2-FCV-63-3-A (0.7HP) N/A N/A N/A N/A 86.31 Pass Boric Acid Transfer Pmp ZA-A 239-2B 2-MTR-62-230-A (1SHP) N/A N/A N/A N/A 89.58 80 SIS Pmp Inlet To CVCS Chrg Pmp 239-IIA 2-FCV-63-7-A (1.9HP) N/A N/A N/A N/A 80.28 Pass RHR Hx 2A Bypass VIv 239-14E 2-FCV-74-33-A (1.9HP) N/A N/A N/A N/A 82.97 Pass HERM BAR5YS BSTR PMP 2A-A 239-2C 2-MTR-70-131-A (10HP) N/A N/A N/A N/A 85.11 80 RHR Hx ATo CVCS ChN//P71p 239-11B 2-FCV-63-8..A (1.griP) N/A N/A N/A N/A 87.15 Pass RWS1ITo RHR Pmp Flow Cont VIv 239-2E1 2-FCV-63-1-A (5.2HP) N/A N/A N/A N/A 90.81 Pass RWST To Spray Hdr 2A FCV 239-9F 2-FCV-72-22-A (3.2HP) N/A N/A N/A N/A 88.02 (SIB) Pass 2n39-TRAg Pmp 2A-A AOP 239-3E 12-MTR-62-AOP-A (2HP) I N/A N/A N/A N/A 85.37 85 Page 19 of 27

Caic. STUDY-EEB-WBN-12-O01 Appendix A Rev. 0 2A Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Limit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation (SI-A or SI-B1 and Individual Motor Starts Sl Phase A SI Phase 8 Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage (%) Terminal Voltage Terminal Voltage (%) Terminal Voltae V(%'

ETAP Bus ID/ 6.6kV 460V ComptNo Load Description 6.6kV / 460V Base SI Phase A 6.6kV / 460V Base SI Phase B 6.6kV / 460V Base Base SISProp 2A-A Inlet Viv 239-12A-- 2-FCV-63-47-A (1.9rP) N/A N/A N/A N/A 78.09 Pass MFW Pmp A-A Lube Oil Pmp A-A 239-4E 2-MTR-3-118D-A (0.25HP) N/A N/A N/A N/A 89.61 85 SISTo RCSLoops 2&3 FCV 239-120 2-FCV-63-93-A (1.61-P) N/A N/A N/A N/A 91.22 Pass SISPmp 2A-A Outlet FCV 239-12E 2-FCV-63-152-A (1.9HP) N/A N/A N/A N/A 8949* Pass 515Prop Out RCSLp1&3 Hot Leg 239-13A 2-FCV-63-156-A (1.9HP) N/A N/A N/A N/A 83.86 Pass RCS Press Relief FCV 239-60 2-FCV-68-333-A (1.9HP) N/A N/A N/A N/A 89.95 Pass Cntmt Sump To Spray Hdr 2A FCV 239-13B 2-FCV-72-44-A (3.2HP) N/A N/A N/A N/A 82.00 Pass RHRSpray Hdr 2A isln Viv 239-14A 2-FCV-72-40-A (1.9HP) N/A N/A N/A N/A 86.50 Pass 480V RMOV Board 2AZ-A Lwr Cntm 2D Cir Dish ISOVlv Closes 240-10A 2-FCV-67-112-A (0.33hp) N/A Not Running 85.97 (Starts) 88.00 Pass Up Cntm Vt CIr2C Dish [so Vlv Closes 240-10D 2-FCV-67-296-A (0.13hp) N/A Not Running 75.07 (Starts) 86.16 Pass Up Cntm Vt Cdr20 Dish Iso VIv Clses 240-10 2-FCV-67-142-A (0.13hp) N/A Not Running 76.26 (Starts) 86.51 Pass RCP Thrm Barr Rtn Cntm iso Viv Moe 240-11D 2-FCV-70-90-A (0.71p) N/A Not Running 86.96 (starts) 88.28 Pass RCPThrm Barr Cntmt lsin Vlv Closes 240-11E 2-FCV-70-133-A (0.13hp) N/A Not Running 75.18 (Starts) 88.94 Pass RCPOtiCir Rtn Cntmt Isin ,v UOao 240-12D 2-FCV-70-92-A (0.13hp) N/A Not Running 85.07 (Starts) 90.95 Pass iaoses Excs Ltdn Hx Cont Init iso Vlv Closes on 240-16D 2-FCV-70-143-A (0.33hp) 85.07 Phase A 85.53 Phase A 87.61 Pass St Gen No 1 FW [sin Viv Use 89-10 Use 89-10 240-3D 2-FCV-3-33-A (39.4hp) 86.38 start 86.85 start 86.86 Pass St Gen No 3 FW IsIn Viv Use 89-10 Use 89-10 240-41 2-FCV-3-87-A 139Ahp) 87.15 start 87.63 start 87.77 Pass Lwr Cntm 2A CIr Dish Iso Viv Uoases 240-70 2-FCV.67-87-A (0.13hp) N/A Not Running 81.03 (starts) 87.34 Pass Up Cntm Vt ir 2A Sup Iso Viv Uose1 240-7F 2-FCV-67-130-A (0.13hp) N/A Not Running 76.04 (Starts) 86.47 Pass Lwr Cntmt 2A CIr Sply -sln Viv ses 240-83 2-FCV-67-107-A (0.33hp) N/A Not Running 85.95 (Starts) 88.27 Pass Lwr Cntm 2C Or Dish iso Viv ,s 240-3D 2-FCV-67-95-A (0.13hp) N/A Not Running 80.8 (Starts) 87.16 Pass Page 20 of 27

Calc. STUDY-EEB-WBN-12-O01 Appendix A Rev. 0 2A Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage R~esuts Shown for DRE Adtuation (S;I-A or SI-Bl and Individual Motor Starts SI Phase A SI Phase B Minimum Required DBE Actuation DBE Actuation Individual Motor Start Voltage Terminal Voltage (%) Terminal Voltage % Terminal Voltage (%) Terminal Voltage V(%)

ETAP Bus ID/ J 6.6kV7/460V Compt No Load Description 6.6kV / 460V Base SI Phase A 6.6kV / 460V Base SI Phase B 6.6kV / 460V Base Base Up Cntm vt Cit ZCSup Iso Viv doses 240-SF 2-FCV-67-133-A (0.13hp) N/A Not Running 76.32 (Starts) 86.47 Pass Lwr Cntmt 2C CIr Sply Isle Vlv Closes 240-9A 2-FCV-67-99-A (O.33hp) N/A Not Running 85.67 (Starts) 88.00 Pass Lwr Cntm 29 COrDish Iso Viv Coeses 240-9B 2-FCV-67-104-A (0.33hp) N/A Not Running 86.87 (Starts) 89.38 Pass Up Cntm Vt Cir 2A Dish Iso Viv loeses 240-9D 2-FCV-67-29S-A (0.13hp) N/A Not Running 74.94 (Starts) 85.86 Pass Up Cntm Vt Or 2B Dish Iso VIv Coses 240-9F 2-FCV-67-139-A (0.13hp) N/A Not Running 76.38 (Starts) 86.47 Pass Cmpnt COg Hx A Disch Cont VIv 240-11A 2-FCV-67-146-A (0.3HP) N/A N/A N/A N/A 89.16 80 CCS HXB ERCW BYPASS FCV 240-15A 2-FCV-67-143-A {0.13HP) N/A N/A N/A N/A 78.67 Pass RHR Hx A-A Outlet VIv 240-16E 2-FCV-70-156-A (0.33HP) N/A N/A N/A N/A 89.51 Pass Sample Hx Hdr Outlet Viv 240-17A 2-FCV-70-183-A (0.13HP) N/A N/A N/A N/A 86.06 Pass 480V BD RM 2A A/c CPRSR 2A-A 240-17E 2-MTR-31-465-A (50HP) N/A N/A N/A N/A 91.61 85 ERCW Hdr Alain VIv 240-2A 2-FCV-3-116A-A (0.25HP) N/A N/A N/A N/A 83.72 Pass ERCW Hdr AIsln Viv 240-2B 2-FCV-3-116B-A (0.25HP) N/A N/A N/A N/A 83.68 Pass AFWP Turb Stm Sup Fm Stm Gen I 240-2D 2-FCV-1-15-A (1HP) N/A N/A N/A N/A 91.15' Pass ERCW Hdr AIsln Viv 240-3A 2-FCV-3-136A-A (0.33HP) N/A N/A N/A N/A 83.49 Pass ERCW Hdr A Isln VIv 240-38 2-FCV-3-136B-A (0.33HP) N/A N/A N/A N/A 83.50 Pass Sample Hx Isin Vli 240-SA 2-FCV-70-215-A (0.13HP) N/A N/A N/A N/A 86.16 Pass Cntmt Spray Hx 2A Sup Cont VIv 240-SE 2-FCV-67-125-A (0.33HP). N/A N/A N/A N/A 89.40 Pass Cntmt Spray Hx 2A Dlsch Viv 240-SF 2-FCV-67-126-A (0.33HP) N/A N/A N/A N/A 88.91 Pass AFWP Turb Sim Sup Fm Sim Gen 4 240-6A 2-FCV-1-16-A (1HP) N/A N/A N/A N/A 9114' Pass

This MOV terminal voltage Is calculated taking credit for the hammer blow feature.

Page 21 of 27

Caic. STUDY-EEB-WBN-12-0O1 Appendix A Rev. 0 2B Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umlt)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for OBE Actuation (SI-A or SI-B and Individual Motor Starts 51Phase A SI Phase 8 DBEActuation DBEActuation Individual Motor Start Minimum Required Voltage ETAP Bus ID/ Terminal Voltage (%) Terminal Voltage N%) Terminal Voltage (%) Terminal 6.6kV- 4 WV(%

Volta!a Ve%)

Compt No Load Description 6.6t / 460V Base 51Phase A 6.6W / 460V Base SI Phase B 6.6kV / 460V Base Base 79gW Shutdown Board 20.-

AuxFeedwater PMP 26-a 15-10AFW 2-MTR-3-128-B (600 HP) 99.11 Starts 99.11 Starts 99.09 85 CNITMT SPRAY PMP 28-8 15-13 CSP 2'MTR-72-10-6 (700 HPi N/A Not Running 98.93 Start 98.93 go RHRPUMP 2B-8 15-14 RHR 2-MTR-74-20-8 (400 HP) 99.04 Starts 99.04 Starts 99.06 80 SAFEY INJPMP 2B-B 15-15 SI 2-MTR-63-15.B 1400HP) 99.06 Starts 99.06 Starts 99.06 80 CNTFGLCHRG PMP 28-B 15-8 CCP 2-MTR-62-104-8 (600 HPI 98.99 Starts 96,99 Starts 98.99 go Starts (H-So Starts(H-BorG. G-Bstart, but 6 start, but not not both, ERCWPMP H-B both, other Is other Is not 15-8 ERCW O-MTR-67-S9-B (8O0 HP) N/A not runrina) N/A running) 96.05 90 Starts (NH-o Starts(H-BorG. G-Bstart, but Bstart, but not not both.

ERCWPMPG-B both, other Is other Is not 15-9 ERCW O-MTR-67-55-6 (800 HPI 96.72 not running) 96.72 running) 96.66 90 480V Shutdown Board 201-B CmnpntCISSys Prop 2B-8 137-3C 2-MTR-70-33B (3SOhp) 81.41 starts 81.82 Starts 81.O5 70

.Eloc, BRm AUA-M 138-7A 0-MTt-31-31D-6 (SOhp) N/A Running N/A Running 88.7 80 Spent Fuel Pit Prop C-SALTFOR 138-7B 0MTS-78-35-S (100 hp) N/A Running N/A Running 85.43 g0 Reac LwrCompt Ot Fan 20-8 138-71 2-MtR-3S-75-B (80 hp) N/A Running N/A Trips 82.99 80 480V Shutdown Board 282-A et Bdrmn A/CB-B Cprsr 139-2B 0-MTR-31.129/2-B (250 hp) N/A Running N/A Running 86.94 85 nCmtPtas Sys Prop C-S 139-20 0-MM-70-51-S (350 hp) N/A Running N/A Running 70.08 (SIB) 70 RemcLwrCompt Cir Fan 2D-8 140-70 2-MTR-30-78-8 (60 hp) N/A Running N/A Trips 86.09 80 Not Running Cotrt AItRtn Fan 2B-8 Nut Running Starts @ 9 140-9C 2-MTR-30-39-86(100 hp) N/A Starts @ 9 Min 84.59 Min 86.54 80 1480V Shutdown ad Rm AHUD-8 140-90 0.MtR-31-61-B (75hp) N/A Running N/A Running 89.3 85 480V CA Vent Board 281-8 Aux Cont Air Cprsr B-13 209-2A 0-MTR-32-84B(20 hp) N/A Not Running N/A Not Running 84.06 s0 Pon Rm Er713CbrFan 213-13 209-2C 2-MTR-30-197-B (3 hp) 85.22 Startson AM 86.03 StartsonABI 91.23 80 hr Pipe Chase C Fan 2S-B 209-38 12-MTR-30-202-B (3 hp) 84.86 iStartsaon ABI 185.66 starts on AsI 89.65 1180 Page 22 of 27

Caic. STUDY-EEB-WBN-12-001 Appendix A Rev. 0 28 Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytcal Umlt)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation ISI-A or SI-B) and Individual Motor Starts SI Phase A SI Phase B DBE Actuation DBE Actuation IndlMdual Motor Start Minimum Required Voltage Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage (%) Terminal VoltaSe V{%)

ETAP BusID/ 6.6 460V Compt No Load Description 6.6kV / 460V Base SI Phase A 6.6kV / 460V Base SI Phase B 6.6kV / 460V Base Base Cntm Spray Pmp 2B-8Rm Cr Fan Starts on 209-3C 2-MTR-30-178-B (7.5 hp) 81.68 Random 82.46 PumpStart 85.59 80 AumBSlg Gas Trtmt Sys Fan 8-8 209-3D 2-MTR.30-157-6 (So hp) 81.1 Starts on AeI 81.87 Starts on ABI 88.34 80 iA'ERY RM EL692 EXHFANC-4 209-4A O-MTR-31-27-B (2 hip) N/A Running N/A Running 89.74 85 AFWP&SA XFRPMP SP CiAFANB.

209-SE 2-MT-30-185-8 (IS hp) 85.35 StartsaonAB 86.16 Starts on A8I 88.71 80 ERCW Str 28-6 209-6B 2-MlR-67-10-B (3 hp) N/A Running N/A Running 77.35 75 Traveling Sc-m2B-8 209-6C 2-MTR-67-E0-6 (S hp)

.125VVit Bat Rm IVEFdFn N/A Running N/A Running 81.59 80 2A2-B 209-78 2-MTR-31-288.6 (0.33 hp) N/A Running N/A Running 92 85 Safety InJPrp 28-8 Rm Cir Fan Starts on Pump Starts on 209-8A 2-MTR-30-179-B (S hp) 83.21 Start 84 Pump Start 87.86 80 Pen Rm El692 Or Fan 21-1 209-8B 2-MTR-30-187.6(3 hp) 84.87 Starts on ABI 85.67 Starts on ABI 89.67 80 5htdn Xhnr Rm 20 ExhFan 202-8 209-8C 2-M'tt-30-246G-8 (3 hp) N/A Running N/A Running 91.81 80 Shtdn Xfmr Rm 20 ExhFan 283-8 209-8D 2-MTR.30-246H.B (3 hpi N/A Running N/A Running 85.86 80 BldgEle BdRm ACCir Prop 8 209-8E 0-MTR-31-129/1-8 20 hp) N/A Running N/A Running 88.41 85 ELBOR AC BoBCONTROL/0.PMP 209-BFI G-MTR.31.129/3-8 (5hp) N/A Running N/A Running 92.24 85 RHRPmp 28-8 Rm CIrFan Starts on Pump Starts on 209-9A 2-MTR-30-176-. (S hpl 84.05 (2s) start 84.98 (2s) Pump Start 82.62 80 48V Bd Rm ZAPr SupFan 2A2-B 209-9C 2-MTR-31-463.6 (3 hp) N/A Running N/A Running 92.91 85 ihtdn Xfrm Rm 26 ExhFan 281-6 209-9D 2-MTR-30-246F-. 13hp) N/A Running N/A Running 92.51 80 en Rm El 737CIr Fan 28-209-9E 2-MTR-30-195.B(13 hp) 85.73 Starts on ABI 86.55 Starts on ABI 91.79 80 Cntfg Chrg Prop 28-BRm Cit Fan Starts on Pump Startson 209-I0A 2-MTR-3D-182-B (Shp) 84.1 Start 84.9 Pump Start 89.11 80 480V ad are 20 Pr Sup Fan 282-B 209-10B 2-MTR-31-477-B (3 hp) N/A Running N/A Running 93.3 85 12SVVit BatRm IIIEn 2a2-I 209-IOC 2.M'R-31-268.B (0.33 hp) N/A Running N/A Running 92.03 85 Cont Rm Intake Mon 209-IOFI 0-M9O0-126-8 (0.75 hp) N/A Running N/A Running 93.29 85 480V BbRm 20 ANCAhu 284 209-118 2-MTR-31-475- (20 hp) N/A Running N/A Running 90.95 85 480V ad Rim20 AVC cond23.

209-11C 2-MTR-31-289-BI(20hp) N/A Running N/A Running 90.38 85 EGTrtmt Sys "- Rm ir Fan 209-128 2.MTR-30-207-B(S3 hp) 85.5 Starts onA9I 86.32 Starts on A8I 91.86 80 ERCWScm Wash Pmp 2B-B 209-130 2-MTR-67-447.6 (40 hp) N/A N/A N/A N/A 76.04 (SIB) 75 RWSTTo Spray Hdr2B FCV 209-7E 2-FCV-72-21-8 (3.3 hp) N/A Not Running N/A tint Running 89.23 Pass Page 23 of 27

Calc. STUDY-EEB-WIIN-12-OO1 Appendix A Rev. 0 2B Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umlt)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuaton (5SI-A or SI-B and Individual Motor Starts SI Phase A SI Phase B OBEActuation DeEActuation individual Motor Start Minimum Required Voltage Terminal Voltage (%) Terminal Voltage (%) Terminal Voltage (N) Terminal Volta'e V,%)

ETAP BusID/ 6.6rV/ 460V Compt No Load Description 6.6kV / 460V Base SI Phase A 6.6kV / 460V Base SI Phase B 6.6kV / 460V Base Base IERCW Str 2"-B Flush VIv 209-6E 2-FCV-67-108-B (0.33HP) N/A N/A N/A N/A 82.73 so ERKW Str 25- Bckwash VIV 209-4E 2-FCV-67-IOA-B (O.33HP) N/A N/A N/A N/A 82.99 80 1

48 V CA Vent Board 282-B None 480V Diesel Aux Board 281-8 DG2B-8 AM EXHFAN19 223-20 2-MTR-30-45-B (15 hp) 91.73 Starts 92.13 Start 93.06 85 DG28-8 Lbe Oil Clnm Prop 1 223-2D 2-MTR-82-81-6 11hp) N/A Running N/A Running 95.01 85 rM0%ENGSUPVLVFROM HORto Open on Dieeml Openon 223-3A 2-FCV-67-67-8 (0.13hp} 82.62 start 82.98 iesel Start 86.11 Pass DG28- DAYTNKFO XFRPMP I 223-3D 2-MTR-18-5S/4-8 (I hpl 91.57 Random 91.96 Random 94.93 85 DG6R 2" PotVent Fan 223-4D 2-MTR.30.494-8 (1S hpi) N/A Running N/A Running 92.41 85 W 2B 480V E BdRm nec Ex Fan 223-4E 2-MTR-30-462-B 12hp) N/A Running N/A Running 94.53 85 S28-8 Muffler Rm Isth Fan 223-6A 2-MTR-30-466 (0.510P) 91.97 Starts 92.37 Starts 95.49 85 480V Diesel Aux Board 2B2-B DG211-8Aux LupeOUrimProp B 224-ZA -2MTR-82-AOPB2B (0.75 hpi N/A Running N/A Running 94.78 85 Dr 28- RMEXHFAN2-B 224-28 2-MTR-30-454-8 (15 hp) 93.44 starts 92.08 Start 93.5 85 IG2-Lube Oilcir, Pmp 2 224-20 2-MTR-82-B2-6 (1 hp) N/A Running N/A Running 95.21 85 G28-8 DAYTNhFOXFRPMP 2 224-3D 2-MTR-18-54/4-8 (I hp) 93.21 Random 91.85 Random 95.21 85 480V RMOV Board 291-B AFWPmp "-BLube0i Pimp B-P 241-17D 2-MTR-3-128D-B (0.25 hp) N/A Running N/A Running 89.82 85 SISAccum Tank Flow Isol Viv 241-3F2 2-FCV-63-98-B (19.5 hpi 80.71 Not Running 81.43 Not Running 84.24 Pass HJJFPSys Low Level Intake Viv 241-5A 0-FCV-268-1B (0.13 hp) N/A Running N/A Running 80.39 80 RCSPress Relief FCV 241-SE 2-FCV-68-332-8 (2 hp) N/A Not Running N/A Not Running 88 .80* Pass Seal Flow Rot lslnViv (oses on Ph A 241-6D 2-FCV-62-61-B(1.g hp) 79.93 iStarts) 80.64 Not Running 86.3 Pass CHRGFLOW ISLNVLV 241-7A 2.FCV-82-91-B (1.9 hp) 83.04 Close$ on SI 83.77 aoses on SI 83.99 Pass Vol Cant Tank Outlet Isin VIv 241-&A 2-.CV-62-133-8 (1.e hp) 78.75 Closes on SI 79A5 cloes onSI 84.9 Pass RWITO CHRGFMP VALVE CONT 241-8B 2-LCV-62-13-8 (1.9 hp) 77.7 Opens on SI 78.39 0pens on Sl 83.76 Pass RHRTo RCSH.L.1&3Flow Iso V 241-95 2-FCV-63-172-B (2.6 hp) N/A Nott Running 80.11 Pass Page 24 of 27

Caic. STUDY-EEB-WBN-12-001 Appendix A Rev. 0 2B Boards EVALUATION at CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation (SI-A or SI-B)and Individual Motor Starts SI Phase A SI Phase B DBEActuation DBEActuation Individual Motor Start Minimum Required Voltage Terminal Voltage 1%) Terminal Voltage N%) Terminal Voltage 1%) Terminal Volta e V %)

ETAP Bus ID6 / e460V 6.6kP Compt No Load Description 6.6kV 460V Base SI Phase A 6.6kV / 460V Base SI Phase B 6.6kV / 460V Base Base C*otmspray Prop 28-0 RecircFCV Starts slightly 241-9F 2-FCV-72-13-4(0.1 hpI N/A Not Running 79.89* alter Phase B 85.26 Pass SIS2B-BOshTo RWSTShtff VIv 241-10A 2-FCV-63-4-B (0.66 hp) N/A Not Running N/A Not Running 84.47 Pass RWSTTo SISPump FCV 241-108 2-FCV-63-5-B (2 hpI N/A Not Running N/A Not Running 81.8 Pass RWSTTo Spray Hdr 28 FCV 241-10F 2.FCV-72-21-B(3.2 hp) N/A Not Running N/A Not Running 85.62 Pass SISPmp Inlet To CVCSChrg Pop 241-1IA 2-FCV.63-&-B (2 hp) N/A Not Running N/A Not Running 80.24 Pass RHR axBto SISPmp 241-118 2-FCV-63-11-8 (2 hp) N/A Not Running N/A Not Running 86.86 Pass SISBoron InhTank Shutoff VIv 241-11E 2-FCV-63-25-B (1.9 hp) 82.51 Closes on Sl 83.24 Closes on Sl 87.8 Pass S15Pow 2B-BInlet ViV 241-12B 2-FCV-634"8- (2 hp) N/A Not Running N/A Not Running 82.55 Pass Cntmt Sump To RHRPmp B-B Openat20Min Openat20 241-12D 2-FCV-63-73-8(13.2 hp) N/A after S1 N/A MinafterSI 90.37 Pass SISTo RCSLoops l& 4 FCV 241-12E 2-FCV-63-94-B (1.6 hpl N/A Not Running N/A Not Running 91.33 Pass IS Pmp 20-B Outlet FCV 241-13A 2-FCV-63-153-8 (2 hp) N/A Not Running N/A Not Running 89.61* Pass SISpmp Out RCSLp 2&4.HOt Leg 241-138 2-FCV-63-157-8 (2 hp) N/A Not Running N/A Not Running 86.64 Pass SIS2"-8 Dsh to RWSTShtff VIl 241-130 2-FCV-63-175-8 (0.66 hp) N/A Not Running N/A Not Running 84.87 Pass Cntmt Spray Hdr 28 Isln VIv Open on 241-14A 2-FCV-72-2-0 (3.2 hp) N/A Not Running 83.75 Phase B 85.35 Acceptable Margin RHRSPRAYHOR26 ISOLVLV 241-140 2-FCV-72-41-B (2 hp) N/A Not Running N/A Not Running 90.92' Pass Cntm Sump To Spray Hdr 20 FCV 241-14E 2-FCV-72-40-8 (3.3 hp) N/A Not Running N/A Not Running 89.25' Pass RHRProp 2I8 Inlet ICV 241-15A** 2-FCV-74-21-B (5.2 hp)

Relocated to Bus210-70 N/A Not Running N/A Not Running 94.27 Pass St-ar-tonWI R --

RHRPop 28-8 Min Flow Vh, Start on RHR pump start 241-15B 2-FCV-74-24-5 (0.1hp) 71.67 pump start on Sl 72.3 an S 83.49 Pass RHRHa 28 Bypass Viv 241-1S 2-F'V.74-35-8 (2 hp) N/A Not Running N/A Not Running 78.21 Pass 480V RMOV Board 282.-

480V Bd Rm 28 A/C Cprsr 20.8 242-180 2-MTR-31-447-8 (75 hp) N/A Running N/A Running 91.1 85 ERtCWHdrB kIn VIv 242-ZA 2--CV-3-126A-B (0.67 hp) N/A Not Running N/A Not Running 83.07 Pass ERCWHdr8IsInVtv 242-2B 2-PCV-3-1268-B (0.67 hp) N/A Not Runnirng N/A INot Running 83.06 Pass Page 25 of 27

Caic, STUDY-EEB-WBN-12-OO1 Appendix A Rev. 0 2B Boards .4 EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DBE Actuation (SI-A or SI-B) and Individual Motor Starts SIPhase A SIPhase B DBE Actuation DREActuation Indviddual Motor Start Minimum Required Voltage Terminal Voltage (%e__Terminal Voltage 1%)

TerminalVoltaie____ Terminal Voltage V V(%)

ETAP Bus ID/ 1 6.6kV746V Compt No Load Description 6.6kV I 460V Base SI Phase A 6.6kV / 460V Base SI Phase B 6.6kV / 460V Base Base St Flow To AFWPTurb IsInViv 242-2E 2--CV-1-18-B (1 hp) N/A Running N/A Running 90.84* Pass ERCWHdr R Isin VIv 242-3A 2-FCV-3-179A-8 (0.33 hp) N/A Random N/A Random 83.66 Pass ERCWHdrB sin Vlv 242-30 2.-FCV-3-1798-B 10.33 hp) N/A Random N/A Random 83.67 Pass St Ge No2FW lislnViv Use 89-10 242-3D 2-FCV-3.47-B (39.4 hp) 86.1 Use 89-10 start 82.89 start 86.23 Pass St Gan No 4 FW sln Vtv Use M9-10 242-4D 2-FCV-3-s00-B (39.4 hp) 87.12 Us89-t0start 83.86 start 87.41 Pass LWRCNTMY2WRS SUPISLNVLV Mrs -

242-5C 2-FCV-67-113B (0.3 hp) N/A Not Running 82.26 iStarts) 88.28 Pass Cntmt Spray Hx28 Sup Cost VIv 242-SE 2-FCV-67-123-6 (0.33 hp) N/A Not Running N/A Not Running 89.15 Pass Cntmt Spray Hx28 Sup Disch Viv 242-5F 2-FCV-67-124-B (0.33 hp) N/A Not Running N/A Not Running 88.5 Pass RCPThim BIa" KinCoIrmIso Vi Ems 242-6D 2-FCV-70-87-6 (0.7 hp) N/A Not Running 84.57 IStarts) 90.2 Pass RCPThrm Barr Cntnmt lin Viv zses 242-6E 2-JCV-70-134-B (0.1 hp) N/A Not Running 72.05 (Starts) 85.83 Pass Lwr Cntrmt 28 r Dish Isin Viv loseis 242-70 2-FCV-67-103-8 (0.1 hp) N/A Not Running 76.56 (Starts) 86.35 Pass Up dntm Vt Cdr2ADish Iso Vfi Closes 242-7F 2-FCV-67-131-B (0.1 hp) N/A Not Running 71.76 (Starts) 85.63 Pass Lwr Cotm 20 COrDish Ise Vlv zGoses 242-8D 2-FCV.G7-111-0 (0.1 hp) N/A Not Running 76.9 IStarts) 86.73 Pass Up Cntm Vt Cdr2Cdish Iso VIv lse 242-SF 2-FCV-67-134-B (0.1 hp) N/A Not Running 71.76 iStarts) 85.63 Pass Lwr Cntm 2Aar DIsh iso VIv oses 242-9A 2-FCV-67488 (0.3 hp) N/A Not Running 81.57 (Starts) 86.35 Pass Lwr Cntm 2C( r Dish Io Vlv loses 242-98 2-FCV-67-96-8 (0.3 hp) N/A Not Running 81.06 (Starts) 86.45 Pass UpCntm VtOCr28 Dish Iso Vfi Closes 242-90 2-FCV-67-297-8 (0.1 hp) N/A Not Running 71.38 (Starts) 85.46 Pass UpCntm Vt dIr 28 Sup [ainVtv z.ases 242-9F 2-FCV-67-138-8 (0.1 hp) N/A Not Running 71.76 (starts) 85.63 Pass Lwr Cntmt 26 ar SpiyIsln Viv Z073-s 242-I0A 2-FCV-67-91-B (0.3 hip) N/A Not Running 81.06 (Starts) 86.74 Pass Lwr Cntmt 2DOh"Sply Isn Viv aoses; 242-108 2-FCV-67-es-8(0.3 hp) N/A Not Running 81.57 IStarts) 87.34 Pass UpConm Vt Clr 2D Dish oso Clas 242-10D 2-FCV-67-298-8 (0.1 hp) N/A Not Running 71.85 IStarts) 85.7 Pass Up tntm Vt Oir20 Sup lain Viv 242-IOF 2-FCV-67-141-8 (0.1 hp) N/A Not Running 71.76 (Starts) 85.69 Pass LWRCNTMT 25 CLRSSUPISLNVLV oIM 242-110 2-FCV-67-109.B 10.3hip) N/A Not Running 81.82 (Starts) 87.89 Pass

'CS Hx C Disch ViW To Hdr 8 242-12B D-FCV-67-1.52-8 (0.7 hp) N/A Running N/A Running 89.96 Pass F0P OiL Ci RTNCMT ISLNVLV Closes 242-130 2-FCV-70-89-B (0.3 hp) N/A Not Running 72.25 (starts) 91.79 Pass FCP OilOr Hdr Cntmt lainViv 242-13F 2-FCV-70-140-4 (0.3 hp) N/A Not Running 80.79 (Starts) 86.42 Pass Page 26 of 27

Calc. STUDY-EEB-WBN-12-001 Appendix A Rev. 0 2B Boards EVALUATION of CLASS 1E MOTOR STARTING VOLTAGES at DVR DROPOUT (Analytical Umit)

Comparison of Minimum Available Starting Voltage v/s Required Starting Voltage Results Shown for DOEActuation (SI-A or Sl-B and Individual Motor Starts SI Phase A SIPhase B OBEActuation OBE Actuation Individual Motor Start Minimum Required Voltage Terminal Voltage (%) Terminal Voltage J%) Terminal Voltage (%) Terminal Voltage V(%)

E-rAP Bus ID/ I6-6kV/460V Compt No Load Desaiption 6.6kV / 460V Base SI Phase A 6.6kV / 460V Base SI Phase B 6.6kV / 460V Base Base 242-17A SFPCS HxSply Hdr isInViv 0-FCV-70-194B (0.33 hp) N/A Not Running 1 N/A Not Running 92.18 Pass 480V Reactor Vent Board 28-B None I

This MOV terminal voltage is calculated taking credit for the hammer blow feature.

Page 27 of 27

Calc STUDY-EEB-WBN-1 2-001 Appendix B Page 1 of 4 Voltage Recovery Analysis for DBE Purpose The purpose of the attachment Isto demonstrate that any possible voltage transient caused by motor starting during a DBE (SI with Phase A or Phase B Isolation), including drop to the LOV setpoint, will also result in successful recovery above DVR reset within 5 seconds.

Approach This transient voltage dip and recovery analysis is similar to that analyzed by the offsite power analysis (reference 2.2) which shows that the voltage recovers above the DVR reset within 5 seconds. However, the offsite power analysis credits the use of automatic load tap changers (LTC) for voltage recovery and also assumes minimum operable grid capacity. The offsite power analysis accounts for minimum operable grid capacity by using an extremely conservative technique of forcing the switchyard voltage to the minimum allowable post-event voltage. This technique ignores the voltage recovery that would occur once the larger motors accelerate.

In this analysis, the offsite power source has been modeled using a classical Thevenin equivalent impedance technique (fixed voltage source behind impedance). The impedance chosen is equivalent to that grid capacity that would result in the voltage at the 6.9kV Shutdown Boards dropping all the way to the loss of voltage (LOV) relay setpoint during initial DBE motor starting (block-start of ECCS loads).

Bases/Assumptions

The offsite power LTCs (CSST C & D) are not allowed to correct the voltage during the motor starting event. However, they are allowed to adjust the voltage prior to the event. This is conservative because it will result in the worst-case voltage transient with no voltage recovery from the LTCs.

" The auxiliary power system is assumed to be in normal alignment prior to the event (Unit Boards and RCP Boards on USSTs, Common Boards on CSSTs NB, Shutdown Boards on CSSTs C/D). This is conservative, because it puts the least amount of load on the offsite power source prior to the event and thereby results in a "stiffer" offsite power source impedance (i.e. less recovery).

" The 161kV Switchyard voltage is assumed to be at the minimum operable voltage prior to the event. This is conservative, because it will also result in a "stiffer" offsite power source impedance (i.e. less recovery).

Computations Using the existing ETAP model used to perform offsite power analysis for two unit operation (Ref.

2.2), a dynamic motor starting analysis was performed for both SI-Phase A and SI-Phase B events on each unit. Using a trial and error technique, the switchyard source capacity (MVASC) was adjusted until the applicable 6.9kV Shutdown Board voltages just equaled the LOV setpoint (80%

nominal) at t=0+ in the event being studied.

Each dynamic motor starting study case (SIA and SIB) was run for at least 5 seconds. The associated ETAP reports provide the voltage during the event in 0.1 second intervals for each 6.9kV Shutdown Board.

Results A plot of the worst-case voltage recovery is shown for both Ul SIB and U2 SIB. The results show that in all cases the 6.9kV Shutdown Board voltage recovers above the DVR reset value (operational limit of 6681V) within 4 seconds.

Conclusions This bounding analysis demonstrates that any possible voltage transient caused by DBE motor starting, including drop to the LOV setpolnt, will also result in successful recovery above DVR reset within 5 seconds.

Appendix B Caic. STUDY-EEB-WBN-12-001 Page 2 of 4 ETAP Project: Watts Bar Nuclear Plant 7.0.ON Date: 03-21-2012 Location: //chachaapp5/etaps/wbnp/ SN: 90TVA12DC2 Contract: Revision: Unit 142 Engineer: Study Case: U1 SIB-U2 Config.:, N 4 CSST-U2 WEN-EEB-MS-TI06-0029 Unit 1 SI Phase B. Plant in nonmal alignment (4CSSTs) at lowest operable grid (161kV). No LTC during the event.

Project File: J:\wbnp\RO EDQ00099920120004 (DVR An.alysis)\DVR Analysis WBN\DVRL4V Recovery Analysis\WBNOATA Output Report: UlSIB-152MVA MOTOR STARTING ANALYSIS Bus Voltage

-12M MA.A 13 M:

. 1,*1 . d, DVR Reset 6681V (96.8%)

Reset Time < 4s C1 n-.fsarJ

ýt 4 Appendix B Caic. STUDY-EEB-WBN-12-001 Page 3 of 4 ETAP Project: watts Bar Nuclear Plant 7.0.ON Date: 03-21-2012 Location: //chachaapp5/etaps/wbnp/ SN: 90TVA12DC2 Contract: Revision: Unit 1&2 Engineer: Study Case: Ul12 SIA Config.: N 4 CSST-U2 WBN-EEB-MS-T106-0029 Unit 1/2 SI Phase A. Plant in normal alignment (4CSSTs) at lowest operable grid (161kv). No LTC during the event.

Project File: J:\wbnp\RO EDQ00099920120004 (DVR Analysis)\DVR Analysis WBN\DVRLOV Recovery Analysis\WBNDATA Output Report: U12-SIA MOTOR STARTING ANALYSIS Bus Votage 12AM MAA Hi 'iD to-Ia 14AM 2fA 21;

-,a' DVR Reset 6681V (96.8%)

Reset Time < 4s n-s r-.)

Appendix B Catc. STUDY-EEB-WBN-12-001 Page 4 of 4 ETAP Project: Watts Bar Nuclear Plant 7.0.0N Date: 03-21-2012 Location: //chachaapp5/etaps/wbnp/ SN: 90TVA12DC2 Contract: Revision: Unit 142 Engineer: Study Case: U2 SIB-U2 Config.: N 4 CSST-U2 KBN-EEB-HS-TI06-0029 Unit 2 SI Phase B. Plant in normal alignment (4CSSTs) at lowest operable grid 1161kV). No LTC during the event.

Project File: J:\ubnp\RO EDQ00099920120004 (DVR Analysis)\DVA Analysis WBN\DVRLOV Recovery Analysis\WBNDATA Output Report: U2SrB-152MVA MOTOR STARTING ANALYSIS Bus Voltage 14AW2.A DVR Reset 6681V (96.8%)

Reset Time < 4s I

I

'B nre .)

Calc. STUDY-EEB-WBN-12-001 WON-EEB-EDQ000-999-2007-002, REV. 20 Degraded Voltage Relay Settings ATTACHMENT 11.6 Page 1 of 1 Page 2 of 2 Figure 8.3

- Grid at 153WV Post Event

........... 6081.1v" 6672 V" (ckUP)

I 6642V 084 O

Degraded Votage Relay I

- m- mU 0 I .J~ I~.

I I I 12 FSAR See 8

8.5 11.5 jj omw0 V Moes~o v"*propoA) 66555V ...........

SI Moetr Start Voltage Dip (8060 V per Ref. 2.2) I

-Grid Security Boundary 141kV 6560V (I.e. 1 faffure away from co-,apse)

I

.----------. 6072 V 600 V- (PCkp) LV-I. LV-2 Timers Nomtil Reset

-Losw of Voltage Relay i ! I

- p - .~ - .1 I M U I i"

I *

....... Nomi 6000 V I 1 I

0.4 1.14 V- (Dropout)

.......... 934V, volae at motor Stal Point (560oV)

-Grid 113kV Collapse at Calc. No. WBN-EEB-MS-TI06-0029 Rev. 31 This Sheet revised by Revision 31.

I Figure 8.3 - Degraded Voltage and Loss-of-Voltage Relay Setpoint

Analcal Umk (Ref. 2.20)

Operational ULn (Ret. 2.20)

Alowable Value (Excludes PT accuracy- Ref. 2.16) .

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ML12160A350

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