HNP-17-003, License Amendment Request for Emergency Diesel Generator Surveillance Requirements Regarding Voltage and Frequency Limits and the Voltage Limit for Emergency Diesel Generator Load Rejection

License Amendment Request for Emergency Diesel Generator Surveillance Requirements Regarding Voltage and Frequency Limits and the Voltage Limit for Emergency Diesel Generator Load Rejection

ML17156A216
Person / Time
Site:	Harris
Issue date:	06/05/2017
From:	Hamilton T Duke Energy Progress
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
HNP-17-003
Download: ML17156A216 (46)

Text

Tanya M. Hamilton Vice President Harris Nuclear Plant 5413 Shearon Harris Rd New Hill, NC 27562-9300 919-362-2502 10 CFR 50.90 June 5, 2017 Serial: HNP-17-003 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 Shearon Harris Nuclear Power Plant, Unit 1 Docket No. 50-400 Renewed License No. NPF-63

Subject:

License Amendment Request for Emergency Diesel Generator Surveillance Requirements Regarding Voltage and Frequency Limits and the Voltage Limit for Emergency Diesel Generator Load Rejection Ladies and Gentlemen :

In accordance with the provisions of 10 CFR 50.90, Duke Energy Progress, LLC (Duke Energy),

hereby requests a revision to Shearon Harris Nuclear Power Plant, Unit 1 (HNP), Technical Specifications (TS) Surveillance Requirements (SRs) established for the Emergency Diesel Generators (EDGs). The proposed changes to SR 4.8.1.1.2.a.4, SR 4.8.1.1.2.e, SR 4.8.1.1.2.f.2, SR 4.8.1.1.2.f.4.b, SR 4.8.1.1.2.f.6.b, and SR 4.8.1.1.2.f.14 will restrict the steady-state voltage and frequency limits for EDG operation to ensure that accident mitigation equipment can perform as designed. These changes modify the existing non-conservative voltage and frequency limits present in HNP TS. Duke Energy also requests a revision to HNP TS SR 4.8.1.1.2.f.11 to increase the voltage limit for the EDG full load rejection test.This change provides additional operating margin to test acceptance critieria. Attachment 1 of this license amendment request provides Duke Energys evaluation of the proposed changes. Attachment 2 provides a copy of the proposed TS changes (mark-up). Attachment 3 provides excerpts from calculations that are referenced within Attachment 1. The retyped TS pages will be provided to the NRC immediately prior to issuance of the approved amendment.

Duke Energy requests NRC review and approval of this license amendment request within one year of acceptance. The amendment shall be implemented within 60 days following approval.

In accordance with 10 CFR 50.91, a copy of this application, with attachments, is being provided to the designated North Carolina State Official.

This letter does not contain any regulatory commitments.

Should you have any questions regarding this submittal, please contact Jeff Robertson, Manager - Regulatory Affairs, at (919) 362-3137.

U.S. Nuclear Regulatory Commission Serial: HNP-17-003 Page 2 of 2 I declare under penalty of perjury that the foregoing is true and correct. Executed on J v n e S, 2017.

Sincerely, Tanya M. Hamilton Attachments:

1. Evaluation of the Proposed Change

2. Proposed Technical Specification Changes (Mark-Up)

3. Calculation E-6003, Tables A 1, A2, Steady-State Voltage Criteria - Trains A and B Calculation E-6003, Tables AS, A6, Maximum Voltage Criteria - Trains A and B Calculation E-6000, Tables A6-1, A6-2, Degraded Grid Voltage Relay Dropout Setpoint Evaluation - Trains A and 8 Calculation ES-0001, Table 81, AC Valve Actuator Motor Minimum and Maximum Torque cc:

Mr. J. Zeiler, NRG Sr. Resident Inspector, HNP Mr. W. L. Cox, Ill, Section Chief, N.C. OHSA Ms. M. Barillas, NRG Project Manager, HNP NRG Regional Administrator, Region II

U.S. Nuclear Regulatory Commission Page 2 of 2 Serial: HNP-17-003 I declare under penalty of perjury that the foregoing is true and correct. Executed on

, 2017.

Sincerely, Tanya M. Hamilton Attachments:

1. Evaluation of the Proposed Change

2. Proposed Technical Specification Changes (Mark-Up)

3. Calculation E-6003, Tables A1, A2, Steady-State Voltage Criteria - Trains A and B Calculation E-6003, Tables A5, A6, Maximum Voltage Criteria - Trains A and B Calculation E-6000, Tables A6-1, A6-2, Degraded Grid Voltage Relay Dropout Setpoint Evaluation - Trains A and B Calculation E5-0001, Table B1, AC Valve Actuator Motor Minimum and Maximum Torque cc:

Mr. J. Zeiler, NRC Sr. Resident Inspector, HNP Mr. W. L. Cox, III, Section Chief, N.C. DHSR Ms. M. Barillas, NRC Project Manager, HNP NRC Regional Administrator, Region II

U.S. Nuclear Regulatory Commission Serial: HNP-17-003 SERIAL HNP-17-003 ATTACHMENT 1 EVALUATION OF THE PROPOSED CHANGE SHEARON HARRIS NUCLEAR POWER PLANT, UNIT 1 DOCKET NO. 50-400 RENEWED LICENSE NUMBER NPF-63

U.S. Nuclear Regulatory Commission Page 1 of 24 Serial: HNP-17-003 Evaluation of the Proposed Change

Subject:

License Amendment Request for Emergency Diesel Generator Surveillance Requirements Regarding Voltage and Frequency Limits and the Voltage Limit for Emergency Diesel Generator Load Rejection 1.0

SUMMARY

DESCRIPTION 2.0 DETAILED DESCRIPTION

3.0 TECHNICAL EVALUATION

3.1

System Description

3.2 Current Surveillance Requirement Limits 3.3 Approach to Revise Surveillance Requirement Limits 3.4 Description of Changes 3.4.1 Determination of Steady-State Voltage Limit 3.4.2 Determination of Steady-State Frequency Limit 3.4.3 Determination of Voltage Limit for Full Load Rejection Testing 3.4.4 Evaluation of Proposed Limits 3.4.5 Safe Shutdown Equipment Evaluation 3.5 Impact to Accident Analyses 3.6 Conclusion

4.0 REGULATORY EVALUATION

4.1 Applicable Regulatory Requirements and Guidance 4.2 Precedents 4.3 Significant Hazards Consideration 4.4 Conclusions

5.0 ENVIRONMENTAL CONSIDERATION

S

6.0 REFERENCES

U.S. Nuclear Regulatory Commission Page 2 of 24 Serial: HNP-17-003 1.0

SUMMARY

DESCRIPTION In accordance with the provisions of 10 CFR 50.90, Duke Energy Progress, LLC (Duke Energy),

is proposing a change to the Shearon Harris Nuclear Power Plant, Unit 1 (HNP), Technical Specifications (TS) Surveillance Requirements (SRs) established for the Emergency Diesel Generators (EDGs). The proposed changes to SR 4.8.1.1.2.a.4, SR 4.8.1.1.2.e, SR 4.8.1.1.2.f.2, SR 4.8.1.1.2.f.4.b, SR 4.8.1.1.2.f.6.b, and SR 4.8.1.1.2.f.14 restrict the steady-state voltage and frequency limits for EDG operation to ensure that accident mitigation equipment can perform as designed.These changes modify the existing non-conservative voltage and frequency limits in HNP TS. The current voltage limit is plus or minus 10% of the nominal EDG voltage (6900 +/- 690 volts), and the current frequency limit is plus or minus 2% of the nominal frequency (60 +/- 1.2 hertz). The proposed voltage limit is plus or minus 4% of the nominal EDG voltage (6900 +/- 276 volts), and the proposed frequency limit is plus or minus 0.8% of the nominal frequency (60 +/- 0.48 hertz).

In addition, Duke Energy is proposing a change to HNP TS SR 4.8.1.1.2.f.11 to increase the voltage limit for the EDG full load rejection test from 110% of the EDG voltage at the start of the test to 8,280 volts at any time during the test, which is 120% of the EDG nominal voltage rating of 6900 volts. This change provides additional operating margin to test acceptance criteria. The proposed value of 8,280 volts provides adequate test margin and is acceptable for the equipment connected to the EDG.

2.0 DETAILED DESCRIPTION The proposed changes revise the following HNP TS SRs:

SR 4.8.1.1.2.a.4 is being revised to verify that on a slow start from standby conditions, the EDG will come up to a voltage of 6900 +/- 276 volts. The frequency will also be revised to 60 +/- 0.48 hertz (Hz), as this SR verifies that the EDG will start in slow speed and will reach steady-state conditions for voltage and frequency.

SR 4.8.1.1.2.e is being revised to verify that the EDG starts from a standby condition and achieves a steady-state voltage of 6900 +/- 276 volts and frequency of 60 +/- 0.48 Hz in less than or equal to 10 seconds following a start signal.

SR 4.8.1.1.2.f.2 verifies that during shutdown, on a rejection of a load of greater than or equal to 1078 kilowatts (kW), the EDG will maintain a voltage of 6900 +/- 690 volts and frequency of 60 +/-

6.75 Hz, with frequency stabilizing to 60 +/- 1.2 Hz within 10 seconds without any safety-related load tripping out or operating in a degraded condition. This SR is being revised to limit the frequency stabilizing value to 60 +/- 0.48 Hz within 10 seconds without any safety-related load tripping out or operating in a degraded condition.

SR 4.8.1.1.2.f.4.b verifies that during shutdown on a simulated loss of offsite power by itself, the EDG starts on the auto-start signal, energizing the emergency buses with permanently connected loads in less than or equal to 10 seconds, energizing the auto-connected shutdown loads through the load sequencer, and operating for greater than or equal to 5 minutes while the EDG is loaded with the emergency loads. After the energization of these loads, the steady-state voltage and frequency shall be maintained at 6900 +/- 690 volts and 60 +/- 1.2 Hz. This SR is being revised to verify that the EDG maintains a steady-state voltage of 6900 +/- 276 volts and frequency of 60 +/- 0.48 Hz.

U.S. Nuclear Regulatory Commission Page 3 of 24 Serial: HNP-17-003 SR 4.8.1.1.2.f.6.b verifies that during shutdown, on a simulated loss of offsite power in conjunction with a safety injection test signal, the EDG starts on the auto-start signal, energizing the emergency buses with permanently connected loads in less than or equal to 10 seconds, energizing the auto-connected emergency (accident) loads through the sequencing timers, and operates for greater than or equal to 5 minutes and maintains the steady-state voltage and frequency at 6900 +/- 690 volts and 60 +/- 1.2 Hz. This SR is being revised to verify that the EDG maintains a steady-state voltage of 6900 +/- 276 volts and frequency of 60 +/- 0.48 Hz.

SR 4.8.1.1.2.f.11 demonstrates the capability of the EDG to reject a load between 6200 and 6400 kW without tripping. EDG full load rejections may occur because of a system fault or an inadvertent breaker trip. This SR ensures proper engine generator response under simulated test conditions. The test acceptance criteria are established for EDG damage protection. While the EDG is not expected to experience a fault or an inadvertent breaker trip during an event, this testing ensures that the EDG is not degraded for future use, including reconnection to the bus if the trip initiator can be corrected or isolated. This SR is being revised to limit the maximum EDG voltage value achieved during this test from 110% of the EDG voltage at the start of the test to 8,280 volts at any time during the test, which is 120% of the EDG nominal voltage rating.

SR 4.8.1.1.2.f.14 verifies that during shutdown, within 5 minutes of shutting down the EDG, after the EDG has operated for at least 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> at an indicated load of 6200-6400 kW, the EDG starts and accelerates to steady-state conditions of 6900 +/- 690 volts and 60 +/- 1.2 Hz in 10 seconds or less. This SR is being revised to verify that the EDG starts and accelerates to steady-state conditions of 6900 +/- 276 volts and frequency of 60 +/- 0.48 Hz in 10 seconds or less.

The mark-up of the TS pages that illustrate the proposed SR changes are provided in.

3.0 TECHNICAL EVALUATION

3.1

System Description

The function of the EDG System is to provide a reliable source of alternate power to the emergency 6.9-kilovolt (kV) buses for use in the event that normal sources of off-site power are not available. The EDGs automatically start upon receipt of either an Engineered Safety Feature Actuation Signal (ESFAS) or a low bus voltage, as indicated by the bus undervoltage relays, and are automatically connected to the bus through the EDG output breaker upon either a low bus voltage or a loss of bus voltage. The existing onsite power system consists of two EDGs (1A-SA and 1B-SB) that are rated at nominal 6900 volts alternating current (VAC), 6.5 megawatts (MW), have a machine rated power factor of 0.8, and an apparent power rating of 8.125 megavolt amperes (MVA). The EDGs are capable of being ready to load within 10 seconds and being fully loaded within 55 seconds after receipt of a start signal. Each EDG is capable of supplying all power needed for the safe shutdown of the plant under design emergency conditions. Each EDG engine provides a reliable source of driving power to the respective EDG.

The HNP EDGs were manufactured by Transamerica Delaval Inc. (TDI), and their model number is DSRV-16-4. The EDG engine is a 16-cylinder, "V"-type, 4-stroke, turbocharged, after-cooled diesel engine and has a continuous rating of 9074 horsepower (HP). The EDG System is designed to be capable of continuous operation at rated voltage and frequency in a range from 40 to 100% full load under emergency conditions for a minimum period of 7 days. Each EDG is

U.S. Nuclear Regulatory Commission Page 4 of 24 Serial: HNP-17-003 rated for continuous operation for one year between maintenance intervals, at an output of 6,500 kW. This includes operation at 10% overload (7,150 kW) for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> in any 24-hour period. The engine-generator is designed to ensure that at no time during the loading sequence shall the voltage and frequency be lower than 95% and 75% nominal, respectively.

EDG loads are connected sequentially, through the load sequencer, to minimize the voltage drop on the safety buses due to simultaneous large motor starting while all other loads remain connected. Essential loads are divided into eight load blocks for automatic loading through the emergency sequencer in accordance with the loading sequences shown in the HNP FSAR, Table 8.3.1-2c. There are time delays known as design intervals between individual load blocks to allow motors from one load block to accelerate and to allow bus voltage to recover prior to starting motors in the next load block. There are 5-second design intervals between load blocks 1&2, 2&3, 3&4, 4&5, and 5&6. There are 10-second design intervals between load blocks 6&7 and 7&8. Load block 1 is initiated upon closure of the EDG output breaker approximately 10 seconds after receipt of the EDG start signal. Load Block 2 is initiated approximately 5 seconds later, and so on. The last load block, i.e. Load Block 8, receives a start signal 45 seconds after re-energization of the emergency bus (or approximately 55 seconds after the initial EDG start signal). Approximately 10 seconds after successful closure of the Essential Services Chilled Water (ESCW) chiller breaker in Load Block 8, the emergency sequencer generates a permissive signal, which allows HNP operators to manually add loads in Load Block 9.

HNP electrical calculations list all Engineered Safety Feature (ESF) loads and non-ESF loads used in sizing the EDG. These calculations show the nature of the various loads, the number of each load that can be connected to the ESF bus, rating of each load in HP, load in kW, and the loading sequence step time. The continuous rating of each EDG is based on the total calculated consumption of all loads, ESF and non-ESF, that will have to be powered by the system under design basis accident or safe shutdown conditions. The calculated load on each motor or heater is based on conservative design calculations under expected flow and pressure conditions, pump runout condition, or manufacturer's recommendations.

The speed of the EDG will not exceed 111.25% of nominal speed (450 revolutions per minute (rpm)), during recovery from transients caused by disconnection of the largest single load. The engine trip setpoint (overspeed) is 517.5 rpm or 115% nominal to ensure that the unit will not trip on rejection of the largest single load. Following the transient induced by a given load sequence block, the EDGs will recover to within 10% of nominal voltage and 2% of nominal frequency within 60% of each load sequence time interval.

The voltage regulator was manufactured by Portec and is capable of maintaining output voltage within 1% of the voltage setpoint under steady-state conditions between no-load and full-load.

HNP maintenance procedures calibrate the voltage regulator to +/- 1.7%. Each EDG has a Woodward 2301A model electronic speed control governor. Based upon the governor specification at steady-state, the governor has a speed band of +/- 0.25% or a frequency band of nominal +/- 0.15 Hz.

The EDG has a ready-to-load voltage input permissive from Relay UVR1A (EDG 1A-SA) and UVR1B (EDG 1B-SB) set at 5880 volts, and a frequency input permissive which comes from Tachometer K3 (called K3 for both train EDGs) which is set at 430 rpm or 57.3 Hz. Both permissive signals need to be present in order for the EDG output breaker to close.

U.S. Nuclear Regulatory Commission Page 5 of 24 Serial: HNP-17-003 3.2 Current Surveillance Requirement Limits The current EDG voltage and frequency range limits of 6900 volts +/- 10% and 60 Hz +/- 2% within the HNP TS SR 4.8.1.1.2.a.4, 4.8.1.1.2.e, 4.8.1.1.2.f.2, 4.8.1.1.2.f.4.b, 4.8.1.1.2.f.6.b, and 4.8.1.1.2.f.14, are not appropriate for steady-state voltage and frequency conditions. The reasons provided below illustrate the basis for why the current values are not appropriate.

1.

The lower end of the range (6210 VAC) is below the dropout setting of the Degraded Grid Voltage Relay (6420 VAC nominal). The Degraded Grid Voltage Relay reset setting is at 6450 VAC. HNP TS Table 3.3-4, Engineered Safety Features Actuation System Instrumentation Trip Setpoints, Item 9 specifies the Degraded Grid Voltage Relay (DGVR) voltage setpoint to be 6420 VAC with an allowable value of 6392 VAC. The nominal dropout setting is 6420 VAC and the maximum expected voltage considering tolerance is 6438 VAC. It should be noted that the breaker tripping function of the DGVR is blocked while the EDGs are supplying the emergency buses. The lower end of the range (6210 VAC) is also below the required voltage to ensure the loads will function and not be damaged. In order to address this issue, surveillance test procedures were revised to control voltage at a tighter band of 6500-7200 volts.

2.

The upper end of the range (7590 VAC) is above the maximum allowed operating voltage for the 6.6kV motors supplied by the 6.9kV emergency buses (7260 VAC). In order to address this issue, surveillance test procedures were revised to control voltage at a tighter band of 6500-7200 volts.

3.

Use of a higher than 60 Hz frequency was not previously considered in the EDG loading analysis, thus fuel consumption, motor-operated valve (MOV) stroke times, pump speed/output or impact on fan operations were not previously evaluated.

Based upon the reasons identified above, HNP has determined that the values in the HNP TS SR 4.8.1.1.2.a.4, 4.8.1.1.2.e, 4.8.1.1.2.f.2, 4.8.1.1.2.f.4.b, 4.8.1.1.2.f.6.b, and 4.8.1.1.2.f.14, are non-conservative for steady-state operation. Thus, the TS changes proposed by this license amendment request (LAR) are necessary to resolve the non-conservative condition described above.

This LAR also proposes to increase the voltage limit per HNP TS SR 4.8.1.1.2.f.11 for full load rejection testing of the EDGs. This surveillance test demonstrates the EDG capability to reject a full load without overspeed tripping or exceeding the predetermined voltage limits. An EDG may experience a full load rejection because of a system fault or an inadvertent EDG breaker trip during an event. HNP TS require testing the EDG performance per SR 4.8.1.1.2.f.11, to demonstrate the capability of the EDG to reject a load equal to the continuous load rating of the EDG without tripping or sustaining damage. This testing ensures that the EDG is immediately available to perform its required functions after the event, including reconnection to the bus if the trip initiator can be corrected or isolated. The load rejection test envelopes the voltage and frequency variations that are observed during a partial or full load rejection event with the EDG connected to the safety buses.

The existing TS voltage limit value is 110% of the EDG voltage at the start of the test. The test requires that the EDG be paralleled to the grid just prior to load rejection. This reduces margin due to the EDG being in the droop mode (EDG in parallel with the offsite power source during

U.S. Nuclear Regulatory Commission Page 6 of 24 Serial: HNP-17-003 testing). Additionally, a technical basis for the specific 110% value does not exist in any applicable industry or regulatory standards. Institute of Electrical and Electronics Engineers (IEEE) Standard 387-1977, "IEEE Standard Criteria for Diesel-Generator Units Applied as Standby Power Supplies for Nuclear Power Generating Stations (Reference 3), Section 6.4.5, Load Rejection Tests, identifies that load rejection tests shall demonstrate the capability of rejecting the maximum rated load without exceeding speed or voltage which would cause tripping, mechanical damage, or harmful overstresses. Specific voltage limit values are not provided.

Previous full load rejection test results have shown that inadequate margin exists between the resultant transient peak voltages and the TS voltage limit, which is addressed further in section 3.4.3 of this attachment. Therefore, the proposed increase in the voltage limit will provide adequate test margin.

3.3 Approach to Revise Surveillance Requirement Limits New voltage limits for EDG steady-state operation in the isochronous mode (with the emergency power system isolated from the normal, offsite source), were established through evaluation of the EDG nominal terminal voltage and the associated allowable range to ensure that electrical equipment supplied from the emergency power system will be operated within the continuous voltage range for the equipment. For example, motors fed directly from the 6.9kV emergency buses have a nameplate voltage rating of 6.6kV and are capable of continuous, steady-state operation between 90 and 110% of nameplate voltage (5940 VAC to 7260 VAC).

The voltage drop from the EDG to the 6.9kV emergency bus and voltage drop from the buses to the motors was considered as well. An engineering evaluation has been performed and calculations have been analyzed to demonstrate EDG operability based on the proposed voltage limits that will be implemented through HNP surveillance test procedures. Calculation analysis considered a minimum voltage of 96% and a maximum voltage of 104% of nominal steady-state voltage (6900 volts). This evaluation is summarized in section 3.4.1 of this attachment.

New frequency limits based on EDG capability were evaluated after industry operating experience indicated that the existing steady-state frequency limits may not be adequate for all conditions and events. Specifically, the EDG may not be able to support the electrical loads or parameters if the EDG is allowed to operate at the extremes of the frequency range currently allowed by HNP TS of +/- 2%. An engineering evaluation was also performed and calculations have been updated to ensure that the proposed HNP TS steady-state frequency limit is acceptable with respect to load performance.

Frequency variance is addressed from an equipment performance standpoint within calculations concerning safety-related pumps or fans driven by induction motors. The reason for this is that for induction motors, motor speed is a direct function of frequency such that relatively small changes in frequency can have a non-trivial effect on equipment performance while comparatively large changes in voltage do not have a similar effect on motor speed. Induction motors perform work and the amount of work they perform is based on their horsepower rating.

One horsepower represents approximately 746 watts. Watts or horsepower are essentially constant in induction motors such that if voltage drops, current will increase to maintain a constant kW rating. Therefore, pumps, fans, and valves are not significantly impacted from variations in voltage, as long as the manufacturers minimum voltage requirements are satisfied.

U.S. Nuclear Regulatory Commission Page 7 of 24 Serial: HNP-17-003 The plant models the electrical distribution at reduced voltage and has analysis that demonstrates that with the 6.9kV safety bus voltage above 6420 volts (which is less than the proposed EDG lower voltage TS limit), safety-related loads will perform their design function.

The engineering evaluation and calculations demonstrate that the proposed frequency tolerance of +/- 0.8% ensures safety-related pumps meet their design functions, and the accident analyses inputs and assumptions are maintained. The available net positive suction head and the required available net positive suction head of the safety-related pumps was considered for this evaluation. Additionally, safety-related MOVs meet their maximum allowed stroke time with the proposed +/- 0.8% EDG frequency tolerance value. The evaluation also demonstrated that the EDG and the required ESF components may perform their design function with the +/- 0.8% EDG frequency tolerance, as an impact on available kW. The +/- 0.8% frequency limit will be implemented through HNP surveillance test procedures. The aforementioned evaluation is summarized in section 3.4.2 and 3.4.5 of this attachment.

With respect to the increase in the voltage limit for EDG load rejection testing, the proposed voltage limit of 8,280 volts provides adequate margin, based on consideration of past test results. An engineering evaluation of the components potentially impacted by the increased voltage limit on full load rejection tests was completed and determined that the proposed voltage limit of 8,280 volts will not cause any detrimental effects to these components. This evaluation is summarized in section 3.4.3 of this attachment. The proposed limit of 8,280 volts will be incorporated in HNP surveillance test procedures following approval of this LAR.

3.4 Description of Changes 3.4.1 Determination of Steady-State Voltage Limit An evaluation of the appropriate 6.9 kV emergency bus minimum and maximum allowed steady-state EDG voltages, which minimize the effect on motor-driven loads, was completed to ensure that electrical equipment supplied from the emergency power system would be operating within the continuous voltage range of this equipment. This evaluation also confirmed that the values selected are within the capability of the EDGs ratings and control system limits. A description of the methodology used to determine an acceptable steady-state voltage range for operation of the HNP EDGs, while operating in isochronous mode, is provided below.

Methodology

Description:

The minimum allowed EDG steady-state voltage value must support all downstream emergency 480 volt power centers, motor control centers (MCCs), and panels minimum voltage criteria.

The minimum allowed steady-state voltage value needs to ensure that all emergency power system equipment will be operating within the continuous operating range of the equipment and ensure that the value selected is within the capability of the EDG voltage regulator ratings. The minimum allowed voltage limit selection considerations included the EDG operating fully loaded to a 6.5 MW rating, at an assumed 0.8 power factor, and incorporated the resultant voltage drop.

HNP identified the minimum steady-state voltage criteria for the Emergency Power System safety-related buses. Minimum steady-state voltage criteria was obtained from Calculation E-6003, Tables A1 and A2. Copies of these tables are provided in Attachment 3. The criteria is based upon evaluation of the voltage requirements of the individual loads and considers voltage

U.S. Nuclear Regulatory Commission Page 8 of 24 Serial: HNP-17-003 drop in the cables between the power supply and the respective load. Calculation E-6003 indicates that 6497 volts is the lowest voltage criterion for the 6.9kV emergency buses. To establish the minimum allowed 6.9kV emergency bus steady-state voltage necessary to ensure that all downstream 480 volt power centers, MCCs, and Panels will be at or above their minimum voltage criteria, HNP completed an evaluaton. This evaluation identifies the bus voltage during the most heavily loaded conditions with the 6.9kV emergency bus at the DGVR dropout setpoint of 6391 volts (which includes tolerances). Minimum bus voltage values were obtained from Calculation E-6000, Tables A6-1 and A6-2. Copies of these tables are provided in. The bus voltages were then scaled by a factor of 1.0166 (6497 / 6391) to show the 6.9kV emergency buses at the lowest acceptable voltage criterion. The scaling of all downstream buses demonstrated that the minimum voltage criterion is met at all downstream buses. The EDG terminal voltage needs to be slightly higher than 6497 volts to ensure that 6497 volts would be available at the 6.9kV emergency buses, considering the voltage drop in the EDG supply cable. Cable voltage drop is based on installed cable type and length, cable impedance at 85 degrees Celsius, EDG loaded to its 6.5 MW rating, and an assumption of an 0.8 power factor. The maximum cable voltage drop was calculated to be 14 volts. This resulted in an EDG terminal voltage of 6511 volts or 94.36% of nominal rating. This value was conservatively increased to 96% of nominal rating, or 6624 volts. Four percent allows sufficient margin with respect to the manufacturers specified voltage regulation tolerance of +/- 1%. It also allows sufficient margin with respect to the voltage regulator setpoint tolerance of +/- 1.7%, as described in section 3.1.

Maximum allowed EDG steady-state voltage selection must ensure that the electrical equipment supplied from the emergency power system will be operated within the continuous voltage range of the equipment. The voltage value selected must also be within the capability of the EDG voltage regulator rating. The maximum EDG steady-state voltage requires load terminal voltage to be less than the maximum criteria voltage. HNP has an established maximum steady-state voltage criteria for the Emergency Power System safety-related buses. HNP has evaluated the voltage requirements of the individual loads. Maximum voltage steady-state criteria are identified in Calculation E-6003, Tables A5 and A6. Copies of these tables are provided in Attachment 3. At the 6.9kV safety bus, the maximum voltage criteria is 7260 volts. In order to satisfy all of the above considerations, several iterations of bus voltage selections were considered. The value, which satisfies all of the aforementioned conditions, has been identified to be 7145 volts. The downstream power center, MCC, and panel voltages were evaluated and all downstream bus voltages were demonstrated to be within the maximum allowed voltage. If the maximum steady-state voltage at the 6.9kV emergency bus was restricted to EDG terminal voltage of 7145 volts, the downstream 480 VAC power centers and MCCs would be below their maximum voltage criterion, even before considering voltage drop in the load cables. HNP electrical analysis allows a maximum of 1% voltage drop for MCC-fed loads and 2% voltage drop for 480 VAC power center loads. Since MCCs are the limiting power supplies, the evaluation assumed that the minimum voltage drop is 0.5% or 2.4 volts (approximately 34 volts on a 6.9kV basis). From the EDG supply cable voltage drop analysis described above, the supply cable voltage drop of 14 volts was identified when the EDG is loaded to its 6.5MW rating.

For conservatism, the voltage drop was assumed to be 50% of that calculated, or 7 volts.

Therefore, the EDG terminal voltage can be 41 volts higher than the 6.9kV emergency bus voltage, or 7186 volts. For additional conservatism, 7176 volts (104% of nominal) has been identified as the upper limit of the allowable steady-state operating range for the EDG terminal voltage when operating in the isochronous mode. Four percent allows sufficient margin with

U.S. Nuclear Regulatory Commission Page 9 of 24 Serial: HNP-17-003 respect to the manufacturers specified voltage regulation tolerance of +/- 1%. It also allows sufficient margin with respect to the voltage regulator setpoint tolerance of +/- 1.7%.

Review of Test Results:

Maintaining the steady-state voltage limits within +/- 4% of 6900 volts has not been a challenge, based upon a review of EDG surveillance test results for voltage values obtained since 2000 to the present.

3.4.2 Determination of Steady-State Frequency Limit The EDG governor is a Woodward 2301A model electronic speed control governor. Based upon the governor specification at steady-state, the governor has a speed band of +/- 0.25% or a frequency band of nominal +/- 0.15 Hz. HNP has selected a frequency tolerance of +/- 0.8% of the nominal frequency (60 +/- 0.48 hertz) for use in TS.

Since it is possible for an EDG to operate at frequencies other than 60.0 Hz and remain operable, a review of calculations for safety-related equipment was performed to determine the impacts of frequency extremes on HNP equipment. The effects of operating the EDG at the extremes of the proposed TS frequency limits were evaluated and the conclusion is that the increase or decrease in speed for a +/- 0.8% change in frequency is well within the TS overspeed limit and will have no impact on the EDG itself. A summary of the results of this evaluation are provided in section 3.4.5 of this attachment.

Review of Test Results:

Replacement of the EDG 1A-SA governor was completed in May 2012 and replacement of the EDG 1B-SB governor was completed in November 2013 and therefore EDG surveillance test results data since these timeframes to present has been reviewed to verify the proposed frequency limit is acceptable. Maintaining the steady-state frequency limits within +/- 0.8% of 60 Hz has not been a challenge, based upon this review of the EDG surveillance test results.

3.4.3 Determination of Voltage Limit for Full Load Rejection Testing Duke Energy proposes a voltage limit of 8,280 volts (120% of the EDG nominal voltage rating of 6900 volts) for the EDG full load rejection test. The initial voltage values obtained during full load rejection testing are measured with the EDG parelleled to the grid, whereas the steady-state EDG voltage and frequency values described in Sections 3.4.1 and 3.4.2 of this attachment are measured with the EDG in the isochronous mode of operation. From review of refueling outage (RFO) data from the last eight RFOs, the existing limit provides minimal margin. This data is shown in the following table:

U.S. Nuclear Regulatory Commission Page 10 of 24 Serial: HNP-17-003 (1) Unless otherwise stated, all Actual Peak Voltage values were obtained from a calibrated portable data acquisition recorder.

(2) Actual Peak Voltage value obtained from Main Control Board voltmeter.

Historically, the test results show that the peak voltage often approaches the maximum allowed voltage of 110% of the EDG voltage at the start of the test. A failure of this test would have prevented the plant from starting up until the EDG could pass the test.

Past test results show that the average transient peak voltage is approximately 9% above the steady-state bus voltage prior to the full load rejection test. The transient peak voltage lasts for less than 1 second and returns to a steady-state voltage within approximately 3 seconds of the load rejection. Assuming a typical maximum bus voltage of 7200 volts prior to the load rejection, and a typical 9% transient due to the full load rejection, the expected transient peak voltage Refueling Outage (RFO)

EDG Initial Voltage (VAC)

Peak Voltage Limit (VAC)

Actual Peak Voltage (1)

(VAC)

% Above Initial Voltage RFO-13 1A-SA 7250 7975 7950 9.7 1B-SB 7100 7810 7810 10.0 RFO-14 1A-SA 7100 7810 7500(2) 5.6 1B-SB 7200 7920 7900 9.7 RFO-15 1A-SA 7300 8030 7950 8.9 1B-SB 7100 7810 7800 9.9 RFO-16 1A-SA 7200 7920 7900 9.7 1B-SB 7200 7920 7900 9.7 RFO-17 1A-SA 7200 7920 7800(2) 8.3 1B-SB 7100 7810 7800 9.9 RFO-18 1A-SA 7200 7920 7800(2) 8.3 1B-SB 7200 7920 7900 9.7 RFO-19 1A-SA 7300 8030 8000 9.6 1B-SB 7000 7700 7700 10.0 RFO-20 1A-SA 7300 8030 7800 6.8 1B-SB 7200 7920 7900 9.7

U.S. Nuclear Regulatory Commission Page 11 of 24 Serial: HNP-17-003 would be 7,848 volts, which is 432 volts below the proposed 8,280 volt limit. The revised voltage limit of 8,280 volts has been evaluated to ensure that there will be no component degradation of any connected equipment as a result of voltage transients. The effect of volt-ampere reactive (VAR) power loading on the full load rejection test has also been evaluated to demonstrate the proposed limit of 8,280 volts is acceptable. The effects of the increased voltage limit of 8,280 volts have been analyzed, as summarized below.

Emergency Diesel Generator, Cables, and Switchgear:

Each EDG is designed to withstand a voltage of 14,800 volts based upon initial factory test report data. From NEMA MG-1-1978, Motors and Generators, Section 1-22.51, High-potential Tests, B. Test Voltage - Armature Windings (Reference 2), the test voltage for all EDGs shall be an alternating voltage whose effective value is 1000 volts plus twice the rated voltage of the machine. For HNP, the original test voltage was 14,800 volts with subsequent tests conducted at 12,000 volts. It is acceptable to increase the voltage limit for the full load rejection from 110% of system voltage at start of test to 8,280 volts at any time during the test. The voltage increase will not challenge the electrical insulation of the stator.

The EDG output cables are rated for 15,000 volts continuous use, phase to ground. This is well above the expected maximum voltage for a full load rejection event. The voltage for the control circuitry for each EDG is obtained by transforming the EDG output by two transformers providing a nominal 248 VAC through the Exciter Power Transformer and a nominal 120 VAC through the 3-Phase Potential Transformer. The wiring for these transformers are rated at a minimum of 600 volts, which provides acceptable margin over the 297.6 volts value (i.e., 248 volts

• 120%) that would result from a 8,280 volts transient with the EDG being self-excited and the static exciter voltage regulator not compensating for the increased voltage. The switchgear breaker has a rated maximum voltage of 36,000 volts, which is well above the expected maximum voltage for a full load rejection event.

Voltage Regulator & Control Circuits:

The supplier of safety related diesel components, Engine Systems, Inc., provided a letter to Duke Energy that states, All AC powered components such as the Remote Gate Firing Module, Automatic Voltage Regulator Module, Manual Voltage Regulator, Rectifier Assembly, and associated relays should withstand 120% voltage transient which only lasts 15 to 20 seconds with no negative impact. Electrical component power dissipation and current limits would be negligibly impacted due to the brief nature of the transient. The actual transient would be less than a 15 to 20 second timeframe.

The Exciter Power Transformer is a 6,900/248 volt potential transformer, which supplies power to the Exciter Reactors, Remote Firing Gate Module, Automatic Voltage Regulator Module, and Manual Voltage Control Module. The 3-Phase Potential Transformer is a 7,200/120 volt potential transformer, which supplies power to the Rectifier Assembly, Coils VR1 and VR2, and also feeds the voltage regulator sensing circuits, which is part of the Automatic Voltage Regulator Module.

U.S. Nuclear Regulatory Commission Page 12 of 24 Serial: HNP-17-003 The following table shows the components that are powered from the Exciter Power and 3-Phase Potential Transformers for the voltage regulator and control circuit:

Exciter Power Transformer 3-Phase Potential Transformer Automatic Voltage Regulator Module Rectifier Assembly Manual Voltage Control Module Coils VR1 and VR2 Remote Firing Gate Module Voltage Regulator Sensing Circuits (part of Automatic Voltage Regulator Module)

Exciter Reactors The components in the above table were not high voltage tested with the transformers. These components are 1970s vintage analog circuit boards and do not have published voltage ratings.

Exciter Power Transformer:

The Exciter Power Transformer is a 6900/248 volt potential transformer, which supplies power to the Exciter Reactors. The existing TS SR limit is based on the voltage at the start of the surveillance test. The highest voltage recorded in previous tests is 8000 VAC, as shown in the table on page 9 of this attachment. This resulted in 287.5 VAC to power the circuit cards. The new limit will be 8,280 VAC or 297.6 VAC to power the circuit cards. This is not a large increase in applied voltage and is only applied for approximately 3 seconds. The concerns for higher voltage are: (1) exceeding the insulation resistance to ground and causing a short; and (2) driving more current so that the power losses cause part of the circuit to open. It has been determined that both concerns will not challenge the circuit cards based upon the short amount of time the voltage is applied and the small increase above normal voltage. Therefore, these circuit cards are expected to function correctly at 120% rated voltage for the time interval described above.

The Exciter Power Transformer has a ratio of 6900/248 volts. At 8,280 VAC, the secondary side is at 297.6 VAC. This voltage is used to power the Remote Gate Firing Module, Automatic Voltage Regulator Module, and Manual Voltage Control Module. Capacitors C1 through C6 on the Remote Gate Firing Module are rated for 200 volts continuous. Zener diode VR1 clamps the voltage on these capacitors to 15 volts. The Automatic Voltage Regulator Module has a similar design with a zener diode limiting the voltage applied to the operational amplifiers.

Higher voltages may challenge the insulation resistance within the components powered by the Exciter Power Transformer. The higher voltage could increase current flow and then increase heating due to power losses. Engineering judgement has determined that the electrical component power dissipation and current limits would be negligibly impacted due to the brief nature of the transient. The 20% increased voltage for a timeframe of 1 to 3 seconds will not have an adverse impact on the Remote Gate Firing Module, Automatic Voltage Regulator Module, Exciter Reactors and Manual Voltage Control Module.

3-Phase Potential Transformer:

The 3-Phase Potential Transformer is a 7200/120 volt transformer. The Rectifier Assembly, associated capacitors, and coils VR1 and VR2 are on the secondary side of the 3-Phase Potential Transformer. The EDG output voltage of 8,280 VAC was used for evaluating the proposed limit increase. The maximum line voltage of 8,280 VAC is transformed down by a turns ratio of 60 to 138 VAC root mean square (RMS). This is converted to direct current (DC)

U.S. Nuclear Regulatory Commission Page 13 of 24 Serial: HNP-17-003 by full wave rectification. The peak voltage for 138 VAC RMS is 138

• 1.414 = 195.2 volts direct current (VDC).

Coils VR1 and VR2 are Potter & Brumfield, Product Code KUP-14D15-110. Insulation data shows the initial insulation resistance between insulated elements is 100 mega-ohms (M) at 500 VDC. The initial insulation resistance rating test voltage of 500 VDC is higher than the 195.2 VDC peak voltage identified above.

The diodes on the Rectifier Assembly are rated for 200 volts and are installed across the full wave rectifiers. The 200 VDC rating is a continuous rating and bounds the 195.2 volt peak voltage. The 20% increased voltage for 1 to 3 seconds would not have a negative impact on the Rectifier Assembly, Coils (VR1 and VR2), nor the voltage regulator sensing circuits in the Automatic Voltage Regulator Module.

Volt-Ampere Reactive Power (VAR) Loading:

VAR loading affects the initial voltage and magnitude of the voltage transient during the full load rejection test. As mentioned in Section 3.2, just prior to performing this test the EDG is in parallel with the offsite power source or in droop mode. The droop mode and the grid voltage result in a higher initial voltage than the nominal 6900 volts. The amount of droop is proportional to the VAR load present at the time of the test. Full load rejection testing should be performed at a VAR loading that bounds the design load calculation output value.

The allowable test range values for the full load rejection test are 6.2 to 6.4 MW and 3.1 to 3.6 megavolt-ampere reactive power (MVAR) per plant surveillance test procedures. The actual loads during the highest loaded block loading during a Loss of Offsite Power (LOOP) with a simultaneous Loss of Coolant Accident (LOCA) event have been evaluated. The test values bound the calculation output values, as illustrated in the following table:

EDG Calculated Output Value Bounding Test Value Real Power (MW)

Reactive Power (MVAR)

Real Power (MW)

Reactive Power (MVAR) 1A-SA 6.115 2.823 6.2 3.1 1B-SB 6.066 2.826 6.2 3.1 3.4.4 Evaluation of Proposed Limits Surveillance procedures will allow for voltage data collection by either plant indicators on the main control board (MCB), Emergency Response Facility Information System (ERFIS) data, or a portable data acquisition recorder. The voltage indicators on the MCB are Weschler Instruments, Model VX-252, vertical indicators. The indicators display 0-9000 volts, with 200-volt demarcations. ERFIS voltage indication for each EDG is digitally indicated as a four digit whole number. The use of the ERFIS indication provides readability which is sufficient to confirm if the EDG output voltage is within the proposed TS steady-state allowed voltage range without the need to perform rounding, as is required on the MCB indicators due to their readability limitation.

The portable data acquisition recorder is available for EDG full load rejection testing to verify the EDG output voltage is within the proposed TS limit if necessary.

U.S. Nuclear Regulatory Commission Page 14 of 24 Serial: HNP-17-003 Surveillance procedures will allow for frequency data collection by either plant indicators on the MCB or by use of a digital tachometer. The frequency indicators on the MCB are Weschler Instruments, Model VX-252, vertical indicators. The indicators display 55-65 Hz, with half Hz demarcations. A digital tachometer may be used to measure EDG engine speed, which would be converted to obtain frequency indication. There is a direct and fixed correlation between engine speed and frequency of 7.5 rpm per Hz, based on the EDG generator being a 16-pole synchronous unit. The use of the digital tachometer provides readability which is sufficient to confirm if the EDG output frequency is within the proposed TS steady-state allowed frequency range without the need to perform rounding, as is required on the MCB indicators due to their readability limitation.

3.4.5 Safe Shutdown Equipment Evaluation Sections 3.4.5 and 3.5 of this attachment pertain to the proposed steady-state voltage and frequency tolerance changes only, since these changes affect EDG-driven components. As a result of incorporating the proposed surveillance tolerances into HNPs design bases, some calculated maximum post-accident flow rates have increased due to the effect of increased bus frequency on motor speed. Previously, these tolerances were not part of the design bases and pump performance was based on nominal frequency and motor speed. The incorporation of the

+/- 0.8% steady-state frequency tolerance value into the design bases resulted in an increase in the calculated maximum volume demanded from the Refueling Water Storage Tank (RWST) during switchover from injection to recirculation mode. The required volume has increased from 63,360 gallons to 64,688 gallons. Therefore, the RWST must reserve at least 64,688 gallons to meet the switchover demand. Insufficient switchover volume could result in air ingestion and damage to safety-related pumps drawing suction from the RWST. Built-in margin exists to compensate for the increase in required volume. Part of the volume between the RWST Lo-Lo and Empty setpoints is margin that is uncredited by analysis. The currently available switchover margin is approximately 20,600 gallons. The available switchover margin decreased to approximately 19,300 gallons. Since some of the RWST margin can be credited to compensate for the increase in analytical outflow, none of the existing RWST setpoints are affected.

All existing RWST level setpoints remain unchanged and all associated automatic and procedural actions remain unchanged. Current design bases and current licensing bases descriptions that include NUREG-1038, the HNP Safety Evaluation Report (Reference 1),

Sections 6.3.1, 6.3.2, and 7.3.2.1, do not specify a minimum required switchover margin or volume. Therefore, the increase in maximum required switchover volume and corresponding decrease in switchover margin have no impact on the likelihood of equipment malfunction.

The proposed steady-state voltage and frequency tolerances also resulted in a reduction to the injection and recirculation-mode net positive suction head (NPSH) margin for the containment spray (CT) pump. Insufficient NPSH margin can result in pump cavitation and performance degradation. In injection mode, the CT pump net positive suction head available (NPSHA) decreased from 92.3 feet to 92.0 feet and net positive suction head required (NPSHR) increased from 12.5 feet to 13.0 feet. In recirculation mode, CT pump NPSHA decreased from 27.1 feet to 25.5 feet and NPSHR increased from 12.0 feet to 12.4 feet. Although this is a reduction in the available NPSH for the CT pumps, the available NPSH is still greater than the required NPSH in both modes of operation. Current design bases and current licensing bases descriptions that include Reference 1, Sections 6.2.2 and 7.3.2.3 do not specify a minimum

U.S. Nuclear Regulatory Commission Page 15 of 24 Serial: HNP-17-003 required CT NPSH margin. Therefore, the reduction to the CT pump injection and recirculation-mode NPSH margin has no impact on the likelihood of CT pump malfunction.

The changes to RWST switchover margin and CT pump NPSH margin do not affect equipment performance and do not require revision of any safety analysis. The method of calculating these margins was unchanged. Only the flow-rate inputs were revised to account for increased pump speeds associated with the +0.8% frequency tolerance.

In addition, the impact to Auxiliary Feedwater (AFW), Emergency Service Water (ESW),

Component Cooling Water (CCW), Spent Fuel Pool Cooling (SFPC), Boric Acid Transfer (BAT),

and ESCW systems has been evaluated, and the conclusion reached for each of these systems is that equipment functions and limits are maintained with the +/- 0.8% frequency tolerance value.

Plant heating, ventilation, and air conditioning (HVAC) systems have been evaluated for adequacy at the proposed voltage and frequency bands, since variations in voltage and frequency of the power source can impact gas flow rate and efficiency of a charcoal bed due to a lower heater capacity and faster fan speed. The heater performance in these systems was evaluated and it was concluded that the heater design function and performance will be maintained. Design fan flow rates are assumed in engineering calculations, with a +/-20%

tolerance for a residence time of 0.25 seconds per two inches of bed depth in accordance with American National Standards Institute N510-1975, Testing of Nuclear Air-Cleaning Systems.

Fan flow rates are controlled to within +/-10% of design values and it has been determined that the +/- 20% tolerance on residence time is sufficient to envelope speed changes resulting from +/-

0.8% bus frequency.

The Diesel Fuel Oil Transfer system has also been evaluated to determine the impact of the proposed frequency limits on the EDG fuel consumption rate. The plants fuel consumption rate analysis is based upon the full load rating (nameplate) of the EDG. Analysis has shown that at the proposed upper frequency limit, the EDG will operate at less than the full load rating.

There are a number of safety-related MOVs within multiple systems that must operate during or after sequencing. A variation in bus voltage and frequency affects available valve motor torque and valve stroke times. The motor torque values for affected valves were evaluated. Using the proposed EDG voltage and frequency variations, the minimum and maximum motor torque values calculated did not result in an increase or decrease in MOV motor torque outside the bounds of what was previously determined to be the minimum and maximum motor torque with either Offsite Power Available or with current TS variation limits applied. As a result, MOV stroke times are bounded by the more conservative calculated torque values. Maximum and minimum torque value calculation results are summarized in Table B1 of Calculation E5-0001, which is provided in Attachment 3. This table shows the minimum and maximum steady state torque for each MOV for four cases (1) Offsite Power Available; (2) EDG operating at the current TS limit values of 6900 VAC +/- 690 VAC at 60 Hz +/-1.2 Hz; (3) EDG operating at EC

[Engineering Change] 84102 variation levels (which are equal to the proposed TS limit values of 6900 +/- 276 VAC at 60 Hz +/- 0.48 Hz); (4) the EDG at the voltage regulator limit of 6500 VAC at the current TS upper frequency limit of 61.2 Hz.

Motor minimum available output torque is calculated using the MCC voltage for steady-state conditions as powered by the EDG TS minimum allowable voltage and maximum frequency criteria. For those valves which have been identified as not auto-starting during sequencing

U.S. Nuclear Regulatory Commission Page 16 of 24 Serial: HNP-17-003 (refer to Table B1 valves identified with an asterisk in the last column of table), it has been assumed that the motor has heated up due to completion of a single stroke. For the remainder of the valves (those that can auto-start during safeguards sequencing), it has been assumed that the motor has heated up due to a postulated stall during the transient voltage period and completion of a single stroke.

Motor maximum available output torque is calculated using the MCC voltage for steady-state conditions as powered by the EDG TS maximum allowable voltage and minimum frequency criteria. For conservatism, no heat up of the motor, cable or thermal overload relay heaters has been assumed.

The results of the calculation are contained in Table B1. Within Table B1 the minimum and maximum steady state torque values calculated for each valve are identified within the Summary column to the far right side of the table.

A review of the Summary column data indicates that none of the motor torque steady state minimum or maximum values are a result of the proposed TS voltage and frequency limits. For all MOVs except 1CC [Component Cooling Water Valve]-252, the calculated minimum and maximum steady state torque values are a result of the current EDG TS operating limits. The minimum and maximum motor torque values associated with 1CC-252 are associated with the Offsite Power Available case. With implementation of the proposed EDG voltage and frequency variation TS changes, the values shown in the EDG Operating at T/S variation Levels data are no longer applicable. As a result, the values presented in the Summary column will no longer be bounding.

Table B1 also shows that the EDG Operating at EC 284102 Variation Levels motor torque minimum and maximum values calculated are bounded by, or in the case of 1SW [Service Water Valve]-126 which is equal to, the Offsite Power Available motor torque minimum and maximum values presented in Table B1. Therefore, following the change to the EDG steady state voltage and frequency TS proposed limits, all analyzed MOV minimum and maximum torque values will be the result of the evaluated Offsite Power Available case.

As stated in Section 3.1 of this attachment, the FSAR, Table 8.3.1-2c shows the EDG equipment loading sequence. The equipment that is manually loaded on the EDG would be placed in operation in Load Block 9. Each of the manually connected loads has been considered and the equipment credited for safe shutdown and for accident analyses has been evaluated to ensure these loads are capable of performing as designed with the proposed voltage and frequency tolerances on the EDG. Non-rotating loads that are loaded onto the EDG such as uninterruptible power supplies (UPS), battery chargers, and pressurizer heaters were evaluated and this equipment will maintain the capability to meet design requirements with the changes to EDG voltage and frequency bands.

The UPS are rated for an AC input voltage and frequency that envelopes the proposed EDG voltage and frequency tolerances and it has been determined that the UPS design function will be maintained. The Class 1E, 125 VDC battery chargers are also rated for an AC input voltage and frequency that envelopes the proposed EDG voltage and frequency tolerances and it has been determined that the battery function will also be maintained.

U.S. Nuclear Regulatory Commission Page 17 of 24 Serial: HNP-17-003 The Pressurizer Backup Heater Groups A and B are required to have a capacity of at least 125 KW of heating in Modes 1, 2 and 3 per HNP TS 3.4.3. Pressurizer heater output is not affected by variations in frequency. The proposed EDG voltage lower limit is 6624 volts. Engineering calculations demonstrate that both groups of heaters are designed to exceed the required KW per TS 3.4.3 at the DGVR setpoint of 6420 volts. The Pressurizer Heater KW verification surveillance test includes adjustment to the measured KW value in order to determine KW output at DGVR voltage. Therefore, the pressurizer heater power supply design provides the capability to supply, from either the offsite power source or the emergency power source (when offsite power is not available), a predetermined number of pressurizer heaters and associated controls necessary to establish and maintain natural circulation at hot standby conditions. The required heaters and their controls are also connected to the emergency buses in a manner that will provide redundant power supply capability.

An evaluation of the HNP Final Safety Analysis Report (FSAR) accident analyses was performed. The events during which safety-related equipment is operating with power from the EDGs were assessed for the effects of the +/- 0.8% EDG frequency tolerance. The impact to HNP FSAR accident analyses is described within section 3.5 of this attachment.

3.5 Impact to Accident Analyses The FSAR accident analyses can be affected by changes to EDG voltage and frequency through their impact to pump, fan, and valve performance characteristics assumed in the accident analyses. As described in Section 3.3, induction motors in the safety-related pumps, fans, and valves considered in the accident analyses do not see any significant impact from variations in voltage for the requested EDG voltage tolerance of +/- 4%. EDG frequency variations can affect pump and fan flow rates, however, as well as MOV stroke times. From Sections 3.3 and 3.4.5, engineering evaluations show that safety-related pumps will continue to perform their design function and no safety-related MOVs will exceed their maximum allowed stroke time with the proposed +/- 0.8% EDG frequency tolerance. Therefore, the sole impact to the accident analyses from the requested EDG frequency tolerance is a potential change to the assumed pump and fan flow rates. Engineering evaluations have confirmed that the FSAR accident analyses of record (AOR) remain bounding with an EDG frequency tolerance of +/-

0.8%.

3.6 Conclusion Duke Energy has concluded that the more restrictive EDG steady-state voltage and frequency limits proposed demonstrate EDG load equipment functionality. Duke Energy has also concluded that the proposed higher voltage limit for EDG load rejection testing is not beyond the design capabilities of the EDG or its connected equipment. Thus, no degradation would be incurred from short EDG output voltages of 8,280V. In addition, the TS surveillance testing continues to assure that the EDG is not degraded for future application, including reconnection to the bus if the trip initiator may be corrected or isolated.

U.S. Nuclear Regulatory Commission Page 18 of 24 Serial: HNP-17-003

4.0 REGULATORY EVALUATION

4.1 Applicable Regulatory Requirements and Guidance 10 CFR 50.36, "Technical Specifications," paragraph (c)(3), "Surveillance Requirements,"

specifies that surveillance requirements are requirements relating to test, calibration, or inspection to assure the necessary quality of systems and components is maintained, that facility operations will be within safety limits, and that the limiting conditions for operation will be met.

HNP TS are based on the Standard Technical Specifications (STS) NUREG-0452, "Standard Technical Specifications for Westinghouse Pressurized Water Reactors," Revision 4, November 1979 (Agency-wide Documents Access and Management System (ADAMS) Accession No. ML102590431), which were in effect during the initial licensing of HNP.

Sections 3.1.13 and 3.1.14 of the HNP FSAR identify that HNP onsite power system conforms to the following criterion within 10 CFR 50, Appendix A, "General Design Criteria for Nuclear Power Plants":

(1) General Design Criterion 17, "Electric Power Systems," which requires that an onsite electric power system and an offsite electric power system be provided to permit functioning of structures, systems, and components important to safety. The safety function for each system (assuming the other system is not functioning) shall be to provide sufficient capacity and capability to assure that: (1) specified acceptable fuel design limits and design conditions of the reactor coolant pressure boundary are not exceeded as a result of anticipated operational occurrences, and (2) the core is cooled and containment integrity and other vital functions are maintained, in the event of postulated accidents.

The onsite electric power supplies, including the batteries, and the onsite electric distribution system, shall have sufficient independence, redundancy, and testability to perform their safety functions assuming a single failure.

Electric power from the transmission network to the onsite electric distribution system shall be supplied by two, physically independent circuits.

Provisions shall be included to minimize the probability of losing electric power from any of the remaining supplies as a result of, or coincident with, the loss of power from the transmission network, or the loss of power from the onsite electric power supplies.

(2) General Design Criterion 18, "Inspection and testing of electric power systems," which requires that electric power systems that are important to safety be designed to permit appropriate periodic inspection and testing of important areas and features, such as wiring, insulation, connections, and switchboards, to assess the continuity of the systems and the condition of their components.

HNP EDG design surveillance testing requirements are based upon Regulatory Guide 1.9, "Selection of Diesel Generator Set Capacity for Standby Power Supplies," Revision 2, December 1979 (ADAMS Accession No. ML12305A253), and Regulatory Guide 1.108, "Periodic Testing of Diesel Generator Units Used as Onsite Electric Power Systems at Nuclear

U.S. Nuclear Regulatory Commission Page 19 of 24 Serial: HNP-17-003 Power Plants," Revision 1, August 1977 (ADAMS Accession No. ML12216A011) as modified in accordance with the guidance of Information Notice 85-32, dated April 22, 1985.

The HNP FSAR Section 1.8, Conformance to NRC Regulatory Guides, acknowledges that HNP complies with Regulatory Guide 1.9, Revision 2, as presented in FSAR Sections 8.3.1.2.4 and 14.2.12.1.16.

The HNP FSAR Section 1.8 also acknowledges that HNP complies with Regulatory Guide 1.108, Revision 1, as described in FSAR Sections 8.3.1.1.2.14, 14.2.12.1.16, and 3.1.14, with the following exceptions:

RG 1.108, paragraph C.2.a.(5) requires that design accident loading sequence be performed immediately after the 24-hour load run. The requirements of this paragraph will not be fulfilled immediately after the 24-hour load run. Instead, this test will be performed in conjunction with the Integrated ESFAS Test. The Diesel Engine will be operated at full load conditions to reestablish full load temperature conditions. A loss of all AC voltage will then be simulated to demonstrate that the diesel generator unit can start automatically and attain required voltage and frequency. In addition, proper operation for the design-accident-loading-sequence to design-load requirements while maintaining voltage and frequency within limits will be demonstrated as required. This will provide for accomplishment of 24-hour full load carrying capability demonstration as soon as the EDG Systems are ready.

RG 1.108, paragraph C.2.d defines the periodic test interval for the EDGs. The requirements of this section will be fulfilled, as required by FSAR Section 3.1.14, by performing the periodic tests in accordance with the schedule provided in TS.

Transient voltage and frequency response of EDGs is governed by Regulatory Guide 1.9, Revision 2. Section C.4 of Regulatory Guide 1.9, Revision 2, states, in part, the following:

"Frequency should be restored to within 2% of nominal, and voltage should be restored to within 10% of nominal within 60% of each load-sequence time interval.

It is important to note that the +/- 2% criterion on frequency and the +/- 10% criterion on voltage are starting and accelerating design criteria for the EDG. The frequency and voltage criteria are specified in the context of the capability of the EDG to recover from a transient such as EDG load sequencing. To be consistent with the safety analyses and EDG steady-state loading calculations, the +/- 2% criterion on frequency and the +/- 10% criterion on voltage should not have been incorporated into the TS as steady-state operating criteria.

The surveillance requirements affected by this LAR are supported by sections of Regulatory Guide 1.108, Section C. Regulatory Position, Section 2. Testing, as described below.

TS SR 4.8.1.1.2.a.4 is supported by Regulatory Guide 1.108, Section C.2.c.(1), which identifies the following test requirement: Periodic testing during normal plant operation should demonstrate proper startup and verify that the required voltage and frequency are automatically attained within acceptable limits and time. This test should also verify that the components of the EDG unit required for automatic startup are operable.

U.S. Nuclear Regulatory Commission Page 20 of 24 Serial: HNP-17-003 TS SR 4.8.1.1.2.e is supported by Regulatory Guide 1.108, Section C.2.a.(1), which identifies the following test requirement: At least once every 18 months, demonstrate proper startup operation by simulating loss of all AC voltage and demonstrate that the EDG unit can start automatically and attain the required voltage and frequency within acceptable limits and time.

TS SR 4.8.1.1.2.f.2 is supported by Regulatory Guide 1.108, Section C.2.a.(4), which identifies the following test requirement: At least once every 18 months, demonstrate proper operation during EDG load shedding, including a test of the loss of the largest single load and of complete loss of load, and verify that the voltage requirements are met and that the overspeed limits are not exceeded.

TS SR 4.8.1.1.2.f.4.b is supported by Regulatory Guide 1.108, Section C.2.a.(2), which identifies the following test requirement: At least once every 18 months, demonstrate proper operation for design-accident-loading-sequence to design-load requirements and verify that voltage and frequency are maintained within required limits.

TS SR 4.8.1.1.2.f.6.b is not directly supported by a specific section in Regulatory Guide 1.108.

TS SR 4.8.1.1.2.f.11 is supported by Regulatory Guide 1.108, Section C.2.a(4), which requires demonstration of proper operation during EDG load shedding, including a test of the loss of the largest single load and of complete loss of load, and verification that the voltage requirements are met and that the overspeed limits are not exceeded. Reference 3, paragraph 6.4.5 identifies that load rejection tests shall demonstrate the capability of rejecting the maximum rated load without exceeding speeds or voltages which will cause tripping, mechanical damage, or harmful overstresses.

TS SR 4.8.1.1.2.f.14 is supported by Regulatory Guide 1.108, Section C.2.a.(5), which identifies the following test requirement: At least once every 18 months, demonstrate functional capability at full-load temperature conditions by rerunning the test phase outlined in this Regulatory Guide under Regulatory Positions C.2.a.(1) and (2) above immediately following C.2.a(3).

==

Conclusions:==

The following conclusion was reached with respect to the EDG steady-state voltage and frequency limit changes:

Duke Energy reviewed the pertinent regulatory guidance and industry standards for the EDG steady-state voltage and frequency limits and concluded that the proposed changes are appropriate for the SRs being revised. The proposed voltage limit of plus or minus 4% of the nominal EDG voltage (6900 +/- 276 volts) and the proposed frequency limit of plus or minus 0.8%

of the nominal frequency (60 +/- 0.48 hertz) accurately reflect the HNP design bases and the way the plant is operated and are not in conflict with the 10 CFR 50.36 requirements. The proposed changes do not adversely impact the ability of the EDGs to function as designed and do not impact conformance to the applicable General Design Criteria for Nuclear Power Plants, 10 CFR 50, Appendix A. Therefore, the proposed changes are consistent with applicable regulatory requirements and criteria.

The following conclusion was reached with respect to the EDG voltage limit increase during a full load rejection:

Duke Energy reviewed the pertinent regulatory guidance and industry standards for the EDG voltage limit for full load rejection. No numerical voltage criteria is specified in the guidance

U.S. Nuclear Regulatory Commission Page 21 of 24 Serial: HNP-17-003 documents and the HNP TS voltage limit was originally identified as 110% of the initial voltage at start of the test. Typical HNP system voltage is 7200 volts, which equates to a maximum test voltage of 7920V. This value is also equal to 115% of the nominal bus voltage of 6900 volts.

HNP TS are based on the Standard Technical Specifications (STS) NUREG-0452, "Standard Technical Specifications for Westinghouse Pressurized Water Reactors," which were in effect during the initial licensing of HNP. A review of the regulatory guidance documents and industry standards indicates that the voltage resulting from full load rejection should not result in equipment damage which could prevent subsequent use of the affected EDG. Duke Energy has evaluated the proposed voltage limit of 8,280 volts and has determined that there will be no component degradation of any connected equipment as a result of voltage transients with the new voltage limit. In addition, the current, standard industry value for peak voltage has been changed to a value of 5000 volts (120% of nominal 4160 volts), which is identified in the Improved Standard Technical Specifications (NUREG-1431, Standard Technical Specifications -

Westinghouse Plants, Revision 4, April 2012 (ADAMS Accession No. ML12100A222), SR 3.8.1.10). Therefore, Duke Energy is proposing a new maximum voltage limit of 8,280 volts for SR 4.8.1.1.2.f.11, which represents a value of 120% of the nominal 6900 volts.

As discussed above, the proposed changes comply with the above regulatory requirements and guidance.

4.2 Precedents The following letters contain examples in which approval was granted to other pressurized water reactor (PWR) licensees for restricting EDG steady-state voltage and frequency TS surveillance limits: (1) By letter dated April 27, 2016 (ADAMS Accession No. ML16083A481), the NRC issued an amendment to Davis-Besse Nuclear Power Station, Unit 1, to increase the EDG minimum steady-state voltage and frequency acceptance criterion for TS surveillance testing; (2) By letter dated December 10, 2009, (ADAMS Accession Number ML092680285), the NRC issued an amendment to Crystal River, Unit 3, to restrict the voltage and frequency TS surveillance limits for both slow and fast EDG starts; (3) By letter dated April 30, 2009 (ADAMS Accession Number ML090630245), the NRC issued an amendment for Donald C. Cook Nuclear Plant, Units 1 and 2, to revise the diesel generator steady-state parameters.

The following letters contain examples in which approval was granted to other PWR licensees for modifying the EDG voltage limit for the load rejection surveillance requirement: (1) By letter dated December 17, 2015 (ADAMS Accession Number ML15293A589), the NRC issued an amendment to Braidwood Station Units 1 and 2, and Byron Station, Units 1 and 2, to increase the voltage limit for the EDG load rejection surveillance requirement; (2) By letter dated April 24, 2015 (ADAMS Accession Number ML15082A233), the NRC issued an amendment to Seabrook Station, Unit No.1, to increase the voltage limit for the EDG load rejection surveillance requirement; (3) By letter dated December 2, 2013 (ADAMS Accession Number ML13282A147), the NRC issued an amendment to Wolf Creek Generating Station to increase the EDG full load rejection test voltage limit.

4.3 Significant Hazards Consideration Pursuant to 10 CFR 50.90, Duke Energy Progress, LLC (Duke Energy), proposes a license amendment request (LAR) for the Shearon Harris Nuclear Power Plant, Unit 1 (HNP) Technical Specifications (TS) Surveillance Requirements (SR) established for the Emergency Diesel

U.S. Nuclear Regulatory Commission Page 22 of 24 Serial: HNP-17-003 Generators (EDGs). The proposed changes to SR 4.8.1.1.2.a.4, SR 4.8.1.1.2.e, SR 4.8.1.1.2.f.2, SR 4.8.1.1.2.f.4.b, SR 4.8.1.1.2.f.6.b, and SR 4.8.1.1.2.f.14 will modify the Emergency Diesel Generator (EDG) steady-state voltage and frequency limits. In addition, Duke Energy is proposing a change to HNP TS SR 4.8.1.1.2.f.11 to revise the voltage limit for the EDG full load rejection test from 110% of the EDG voltage at the start of the test to 120% of the EDG nominal voltage rating or 8,280 volts at any time during the test.

Duke Energy has evaluated whether or not a significant hazards consideration (SHC) is warranted with the proposed amendment by addressing the three criterion set forth in 10 CFR 50.92(c) as discussed below:

(1)

Does the proposed amendment involve a significant increase in the probability or consequences of an accident previously evaluated?

The LAR proposes to provide voltage and frequency limits that are more restrictive for the steady-state operation of the EDGs than the current TS limits and proposes a change in the voltage limit following a load rejection. The current steady-state voltage limit is plus or minus 10% of the nominal EDG voltage (6900 +/- 690 volts) and the current steady-state frequency limit is plus or minus 2% of the nominal frequency (60 +/- 1.2 hertz). The proposed voltage limit is plus or minus 4% of the nominal EDG voltage (6900

+/- 276 volts) and the proposed frequency limit is plus or minus 0.8% of the nominal frequency (60 +/- 0.48 hertz). The voltage limit following a load rejection is being changed from 110% of the EDG voltage at the start of the test to 8,280 volts at any time during the test, which is 120% of the EDG nominal voltage rating.

More restrictive voltage and frequency limits for the output of the EDG restores design margin and provides assurance that the equipment supplied by the EDG will operate correctly and within the assumed timeframe to perform their mitigating functions. Testing results have been reviewed to verify that the proposed voltage and frequency limits are reasonable for the performance characteristics of the EDGs.

The technical analysis performed to support the change in the voltage limit following a load rejection has demonstrated that the EDGs can withstand voltages at the new proposed maximum voltage limit without a loss of protection. The proposed higher limit will continue to provide assurance that the EDGs are protected, and the safety function of the EDGs will be unaffected by the proposed change.

The EDGs are safety-related components that function to mitigate the impact of an accident with a concurrent loss of offsite power. A loss of offsite power is typically a significant contributor to postulated plant risk and, as such, onsite alternating current (AC) EDGs have to be maintained available and reliable in the event of a loss of offsite power event. The EDGs are not initiators for any analyzed accident; therefore, the probability for an accident that was previously evaluated is not increased by the proposed changes. The proposed voltage and frequency limits will ensure the EDGs will remain capable of performing their design function.

Therefore, the proposed changes do not involve a significant increase in the probability or consequences of an accident previously evaluated.

U.S. Nuclear Regulatory Commission Page 23 of 24 Serial: HNP-17-003 (2)

Does the proposed amendment create the possibility of a new or different kind of accident from any accident previously evaluated?

The LAR proposes to provide voltage and frequency limits that are more restrictive for the steady-state operation of the EDGs than the current TS limits and proposes a change in the voltage limit following a load rejection.

The voltage and frequency limits were established for the steady-state operation voltage and frequency limits, using verified design calculations and the guidance of NRC Administrative Letter 98-10 (Nuclear Document System (NUDOCS) Accession Number 9812280273). These limits will ensure the EDGs will perform as designed. No new configuration is established by this change.

The proposed higher limit for the EDG voltage limit following a load rejection will continue to provide assurance that the EDGs are protected, and the safety function of the EDGs will be unaffected by the proposed change. The proposed increase in the TS SR limit does not affect the interaction of the EDGs with any system whose failure or malfunction can initiate an accident.

The change does not involve a physical modification of the plant. There are no alterations to the parameters within which the plant is normally operated. No changes are being proposed to the procedures relied upon to mitigate a design basis event. The change does not have a detrimental impact on the manner in which plant equipment operates or responds to an actuation signal.

Therefore, no new or different kind of accident from any previously evaluated can be created.

(3)

Does the proposed amendment involve a significant reduction in a margin of safety?

The LAR proposes to provide voltage and frequency limits that are more restrictive for the steady-state operation of the EDGs than the current TS limits and proposes a change in the voltage limit following a load rejection. The proposed TS limits on voltage and frequency will ensure that the EDG will be able to perform all design functions assumed in the accident analyses. The change in the acceptance criteria for specific surveillance testing provides assurance that the EDGs will be capable of performing their design function. Previous test history has shown that the proposed limits are well within the capability of the EDGs.

There will be no effect on those plant systems necessary to assure the accomplishment of protection functions associated with reactor operation or the reactor coolant system.

There will be no impact on safety limits and the associated margin of safety.

The proposed changes do not eliminate any surveillance or alter the frequency of surveillance required by HNP TS. The more restrictive EDG voltage and frequency limits for steady-state operation and the increase in the TS SR voltage limit for the EDGs following a load rejection will not affect the ability of the EDGs to perform their safety function.

U.S. Nuclear Regulatory Commission Page 24 of 24 Serial: HNP-17-003 Therefore, the proposed changes do not involve a significant reduction in a margin of safety.

Based upon the above evaluation, Duke Energy concludes that the proposed amendment presents no significant hazards consideration under the standards set forth in 10 CFR 50.92(c) and, accordingly, a finding of "no significant hazards consideration" is justified.

4.4 Conclusions In conclusion, based on the considerations discussed above, (1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.

5.0 ENVIRONMENTAL CONSIDERATION

S Duke Energy has determined that the proposed amendment changes a requirement with respect to use of a facility component located within the restricted area, as defined in 10 CFR

20. However, the proposed amendment does not involve (i) a significant hazards consideration, (ii) a significant change in the types or significant increase in the amounts of any effluent that may be released onsite, or (iii) a significant increase in individual or cumulative occupational radiation exposure.

Accordingly, the proposed amendment meets the eligibility criterion for categorical exclusion set forth in 10 CFR 51.22(c)(9). Therefore, pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the proposed amendment.

6.0 REFERENCES

1. NUREG-1038, Safety Evaluation Report Related to the Operation of Shearon Harris Nuclear Power Plant, Units 1 and 2, U.S. Nuclear Regulatory Commission, Washington, DC, November 1983 and the following supplements: Supplement 1, dated June 1984; Supplement 2, dated June 1985; Supplement 3, dated May 1986; and Supplement 4, dated October 1986

2. NEMA MG-1-1978, Motors and Generators, Section 1-22.51, High-potential Tests, B. Test Voltage - Armature Windings, dated November 1984

3. IEEE Std 387-1977, "IEEE Standard Criteria for Diesel-Generator Units Applied as Standby Power Supplies for Nuclear Power Generating Stations," Institute of Electrical and Electronics Engineers, 1977

4. Duke Energy Letter, Annual Report of Changes Pursuant to 10 CFR 50.46, dated May 19, 2014 (ADAMS Accession No. ML14139A137)

U.S. Nuclear Regulatory Commission Serial: HNP-17-003 SERIAL HNP-17-003 ATTACHMENT 2 PROPOSED TECHNICAL SPECIFICATION CHANGES (MARK-UP)

SHEARON HARRIS NUCLEAR POWER PLANT, UNIT 1 DOCKET NO. 50-400 RENEWED LICENSE NUMBER NPF-63

INSERT: "0.48" INSERT:

"steady-state" INSERT:

"276"

INSERT:

"steady-state" INSERT: "0.48" INSERT: "276"

INSERT:

"0.48"

INSERT:

"276" INSERT: "0.48" INSERT: "276" INSERT: "0.48"

INSERT:

"8280 volts"

INSERT:

"0.48" INSERT:

"276" INSERT: "a steady-state voltage and frequency of"

U.S. Nuclear Regulatory Commission Serial: HNP-17-003 SERIAL HNP-17-003 ATTACHMENT 3 CALCULATION E-6003, TABLES A1, A2, STEADY STATE VOLTAGE CRITERIA - TRAINS A AND B CALCULATION E-6003, TABLES A5, A6, MAXIMUM VOLTAGE CRITERIA - TRAINS A AND B CALCULATION E-6000, TABLES A6-1, A6-2, DEGRADED GRID VOLTAGE RELAY DROPOUT SETPOINT EVALUATION - TRAINS A AND B CALCULATION E5-0001, TABLE B1, AC VAM MINIMUM AND MAXIMUM TORQUE SHEARON HARRIS NUCLEAR POWER PLANT, UNIT 1 DOCKET NO. 50-400 RENEWED LICENSE NUMBER NPF-63

ATTACHMENT A Voltage Criteria Summary CALCULATION E-6003 PAGE A1, REV. 11 TABLE A1 STEADY-STATE VOLTAGE CRITERIA - TRAIN A POWER NOMINAL MAX CABLE MINIMUM STEADY-STATE VOLTAGE CRITERIA SUPPLY VOLTAGE VOLT DROP MOTORS MOVs SPECIAL CNTR CKTS OVERALL NOTES NOTE 1 NOTE 2a NOTE 3a NOTE 3b NOTE 3c NOTE 3d 6.9KV SWITCHGEAR 1A-SA 6900 34.50 5974.50 6497.00 6497.00 6 480V POWER CENTERS 1A1 480 9.60 423.60 423.60 1A2-SA 480 4.70 418.70 418.70 14 1A3-SA 480 n/a no direct fed loads 480V MOTOR CONTROL CENTERS 1A21-SA 480 4.80 418.80 425.00 424.14 440.00 440.00 1A22-SA 480 4.80 418.80 417.31 410.13 418.80 1A23-SA 480 4.80 418.80 440.00 440.00 1A24 480 4.80 418.80 430.00 421.80 400.00 430.00 20 1A31-SA 480 4.80 418.80 425.00 423.97 440.00 440.00 1A32-SA 480 4.80 418.80 425.93 425.93 1A34-SA 480 4.80 418.80 422.68 417.27 422.68 1A35-SA 480 4.80 418.80 425.00 409.11 417.11 425.00 1A36-SA 480 4.80 418.80 399.21 407.65 418.80 1&4A33-SA 480 4.80 418.80 407.12 389.65 418.80 480V AND 208V PANELS DP-1A3 480 4.80 419.00 390.00 419.00 25 PHPP-1A 480 9.60 267.00 267.00 19 1A211-SA 208 4.16 183.25 190.59 190.59 16, 17, 23 1A212-SA 208 4.16 180.00 180.00 1A231-SA 208 4.16 159.35 159.35 18 1A311-SA 208 4.16 195.10 195.10 23 1A321-SA 208 4.16 183.25 190.09 190.09 16 1&4A33-SA 208 4.16 180 180.00

ATTACHMENT A Voltage Criteria Summary CALCULATION E-6003 PAGE A2, REV. 11 TABLE A2 STEADY-STATE VOLTAGE CRITERIA - TRAIN B POWER NOMINAL MAX CABLE MINIMUM STEADY STATE VOLTAGE CRITERIA SUPPLY VOLTAGE VOLT DROP MOTORS MOVs SPECIAL CNTR CKTS OVERALL NOTES NOTE 1 NOTE 2a NOTE 3a NOTE 3b NOTE 3c NOTE 3d 6.9KV SWITCHGEAR 1B-SB 6900 34.50 5974.50 6497.00 6497.00 6 480V POWER CENTERS 1B1 480 9.60 423.60 423.60 1B2-SB 480 7.40 421.40 421.40 14 1B3-SB 480 n/a no direct fed loads 480V MOTOR CONTROL CENTERS 1B21-SB 480 4.80 418.80 425.00 423.80 416.55 425.00 1B22-SB 480 4.80 418.80 423.00 417.54 401.26 423.00 1B23-SB 480 4.80 418.80 440.00 440.00 1B24 480 4.80 418.80 430.00 421.80 400.00 430.00 20 1B31-SB 480 4.80 418.80 425.00 423.77 440.00 440.00 1B32-SB 480 4.80 418.80 440.00 440.00 1B34-SB 480 4.80 418.80 422.51 430.94 430.94 1B35-SB 480 4.80 418.80 425.00 410.69 440.00 440.00 1B36-SB 480 4.80 418.80 399.18 440.00 440.00 1&4B33-SB 480 4.80 418.80 406.61 389.17 418.80 480V AND 208V PANELS DP-1A3 480 4.80 419.00 390.00 419.00 25 PHPP-1B 480 9.60 285.00 285.00 19 1B211-SB 208 4.16 183.25 189.07 189.07 16, 17, 23 1B212-SB 208 4.16 180.00 180.00 1B231-SB 208 4.16 159.35 159.35 18 1B311-SB 208 4.16 189.75 189.75 23 1B321-SB 208 4.16 183.25 187.65 187.65 16 1&4B33-SB 208 4.16 180.00 180.00

ATTACHMENT A Voltage Criteria Summary CALCULATION E-6003 PAGE A5, REV. 9.

TABLE A5 MAXIMUM VOLTAGE CRITERIA - TRAIN A POWER NOMINAL MAXIMUM STEADY STATE VOLTAGE CRITERIA SUPPLY VOLTAGE MOTORS MOVs BREAKERS SPECIAL CNTR CKTS OVERALL NOTES NOTE 1 NOTE 5a NOTE 5b NOTE 5c NOTE 5d NOTE 5e 6.9KV SWITCHGEAR 1A-SA 6900 7260.00 7260.00 480V POWER CENTERS 1A1 480 506.00 508.00 506.00 1A2-SA 480 506.00 508.00 506.00 1A3-SA 480 508.00 508.00 480V MOTOR CONTROL CENTERS 1A21-SA 480 506.00 504.00 504.00 528.00 506.00 504.00 1A22-SA 480 506.00 504.00 506.00 504.00 1A23-SA 480 506.00 504.00 506.00 504.00 1A24 480 506.00 504.00 504.00 528.00 506.00 504.00 20 1A31-SA 480 506.00 504.00 504.00 520.00 506.00 504.00 1A32-SA 480 506.00 504.00 506.00 504.00 1A34-SA 480 506.00 504.00 506.00 506.00 504.00 1A35-SA 480 506.00 504.00 504.00 506.11 506.00 504.00 1A36-SA 480 506.00 504.00 504.69 506.00 504.00 1&4A33-SA 480 506.00 504.00 506.12 506.00 504.00 480V AND 208V PANELS DP-1A3 480 506.00 552.00 506.00 25 PHPP-1A 480 1A211-SA 208 230.00 230.00 230.00 15, 16, 23 1A212-SA 208 230.00 230.00 15 1A231-SA 208 230.00 230.00 230.00 15, 18 1A311-SA 208 230.00 230.00 15, 23 1A321-SA 208 230.00 230.00 230.00 15, 16 1&4A33-SA 208 230.00 230.00 15

ATTACHMENT A Voltage Criteria Summary CALCULATION E-6003 PAGE A6, REV. 9.

TABLE A6 MAXIMUM VOLTAGE CRITERIA - TRAIN B POWER NOMINAL MAXIMUM STEADY STATE VOLTAGE CRITERIA SUPPLY VOLTAGE MOTORS MOVs BREAKERS SPECIAL CNTR CKTS OVERALL NOTES NOTE 1 NOTE 5a NOTE 5b NOTE 5c NOTE 5d NOTE 5e 6.9KV SWITCHGEAR 1B-SB 6900 7260.00 7,260.00 480V POWER CENTERS 1B1 480 506.00 508.00 506.00 1B2-SB 480 506.00 508.00 506.00 1B3-SB 480 508.00 508.00 480V MOTOR CONTROL CENTERS 1B21-SB 480 506.00 504.00 504.00 528.00 506.00 504.00 1B22-SB 480 506.00 504.00 504.00 506.00 504.00 1B23-SB 480 506.00 504.00 506.00 504.00 1B24 480 506.00 504.00 504.00 505.21 506.00 504.00 20 1B31-SB 480 506.00 504.00 504.00 528.00 506.00 504.00 1B32-SB 480 506.00 504.00 506.00 504.00 1B34-SB 480 506.00 504.00 506.00 506.00 504.00 1B35-SB 480 506.00 504.00 504.00 507.69 506.00 504.00 1B36-SB 480 506.00 504.00 505.18 506.00 504.00 1&4B33-SB 480 506.00 504.00 505.61 506.00 504.00 480V AND 208V PANELS DP-1A3 480 506.00 552.00 506.00 25 PHPP-1B 480 1B211-SB 208 230.00 230.00 230.00 15, 16, 23 1B212-SB 208 230.00 230.00 15 1B231-SB 208 230.00 230.00 230.00 15, 18 1B311-SB 208 230.00 230.00 15, 23 1B321-SB 208 230.00 230.00 230.00 15, 16 1&4B33-SB 208 230.00 230.00 15

Tab A CALCULATION E-6000 Voltage, Loading & Available Fault Current Summary PAGE A25, REV. 13 TABLE A6-1 DGVR DROPOUT SETPOINT EVALUATION - TRAIN A VOLTAGE CRITERIA1 CALCULATED3 BUS (E-6003, TBL A1)

(CASE Train A DGVR) 6.9 kV BUSES 1A-SA 5974.502 6386 480 V POWER CENTERS 1A1 423.60 451 1A2-SA 418.70 437 1A3-SA n/a 447 1A3-SAR n/a 442 480 V MOTOR CONTROL CENTERS & PANELS 1A21-SA 440.00 441 1A22-SA 418.80 445 1A23-SA 440.00 445 1A24 430.00 448 1A31-SA 440.00 441 1A32-SA 440.00 445 1A34-SA 421.35 447 1A35-SA5 440.00 440 1A36-SA5 440.00 440 1&4A33-SA 440.00 442 DP-1A3 419.00 436 PHPP-1A 267.00 454 208 V POWER PANELS PP-1A211-SA 190.59 199 PP-1A212-SA 180.00 201 PP-1A231-SA 159.35 202 PP-1A311-SA 195.10 200 PP-1A321-SA 190.09 203 PP-1&4A33-SA 180.00 199 TABLE A6-1 NOTES

1. Voltage criteria has been obtained from Calculation E-6003, Table A1.

2. Voltage criteria for 6.9kv Bus 1A-SA is based on the most limiting equipment fed from the bus as noted in Calculation E-6003, Table A1 (not including DGVR reset / pickup criteria).

This is done to demonstrate that at the DGVR dropout setpoint, Bus 1A-SA voltage is greater than the voltage required by equipment fed from the bus.

3. Voltages are calculated in Tab Z, Case Train A DGVR using the LOCA with offsite power model after sequencing has been completed. (See Tab Z page Z1352). This model results in worst case emergency power system loading and thus maximum voltage drop in power system cables & transformers. Switchyard voltage has been decreased until Bus 1A-SA voltage is equal to the DGVR dropout setpoint including tolerance (as closely as can be achieved by the computer model). DGVR dropout voltage including tolerance is 6391.4v per Calc E2-0005.09, Table 5.2.

4. See Tab D, Section 2.3 for a description of computer databases and associated cases.

5. Indicates limiting power supply with approximately 0% margin. However, as discussed in E-6000-ICC-0030 (EC 290100) the 440vac criteria is conservative and temporary until all the safety related buckets on each MCC have been replaced by EC 284170.

Tab A CALCULATION E-6000 Voltage, Loading & Available Fault Current Summary PAGE A26, REV. 13 TABLE A6-2 DGVR DROPOUT SETPOINT EVALUATION - TRAIN B VOLTAGE CRITERIA1 CALCULATED3 BUS (E-6003, TBL A2)

(CASE Train B DGVR) 6.9 kV BUSES 1B-SB 5974.502 6390 480 V POWER CENTERS 1B1 423.60 451 1B2-SB 421.40 438 1B3-SB n/a 447 1B3-SBR n/a 442 480 V MOTOR CONTROL CENTERS & PANELS 1B21-SB 440.00 441 1B22-SB 440.00 444 1B23-SB 440.00 445 1B24 430.00 449 1B31-SB 440.00 441 1B32-SB 440.00 443 1B34-SB 430.94 446 1B35-SB5 440.00 440 1B36-SB5 440.00 440 1&4B33-SB 440.00 442 DP-1A3 (1B1) 419.00 444 PHPP-1B 285.00 451 208 V POWER PANELS PP-1B211-SB 189.07 199 PP-1B212-SB 180.00 201 PP-1B231-SB 159.35 202 PP-1B311-SB 189.75 200 PP-1B321-SB 187.65 202 PP-1&4B33-SB 180.00 200 TABLE A6-2 NOTES

1. Voltage criteria has been obtained from Calculation E-6003, Table A2.

2. Voltage criteria for 6.9kv Bus 1B-SB is based on the most limiting equipment fed from the bus as noted in Calculation E-6003, Table A2 (not including DGVR reset / pickup criteria).

This is done to demonstrate that at the DGVR dropout setpoint, Bus 1B-SB voltage is greater than the voltage required by equipment fed from the bus.

3. Voltages are calculated in Tab Z, Case Train B DGVR using the LOCA with offsite power model after sequencing has been completed. (See Tab Z page Z1368). This model results in worst case emergency power system loading and thus maximum voltage drop in power system cables & transformers. Switchyard voltage has been decreased until Bus 1B-SB voltage is equal to the DGVR dropout setpoint including tolerance (as closely as can be achieved by the computer model). DGVR dropout voltage including tolerance is 6391.4v per Calc E2-0005.09, Table 5.2.

4. See Tab D, Section 2.3 for a description of computer databases and associated cases.

5. Indicates limiting power supply with approximately 0% margin. However, as discussed in E-6000-ICC-0030 (EC 290100) the 440vac criteria is conservative and temporary until all the safety related buckets on each MCC have been replaced by EC 284170.

ATTACHMENT B TORQUE CALCULATIONS CALCULATION E5-0001 PAGE B1, REV. 16 TABLE B1 AC VAM MINIMUM AND MAXIMUM TORQUE Offsite Power Available EDG Operating at T/S Variation Levels EDG Operating at EC 84102 Variation Levels EDG at Voltage Regulator Level

SUMMARY

Doc.

CP&L Motor Terminal Voltage Motor LRA MOTOR TORQUE Motor Term Voltage Motor LRA Motor Torque Motor Term Voltage Motor LRA Motor Torque Mtr Term Volt Mtr LRA Mtr T MOTOR TORQUE Note No.

Tag No Trans > 90% Lo SS > 90%

Hi Trans Lo SS Hi Trans Lo SS Max Lo SS > 90%

Hi Lo SS Hi Lo SS Max Lo SS > 90%

Hi Lo SS Hi Lo SS Max Lo SS > 90%

Lo SS Lo SS Trans Lo SS Max 5 & 6 B001 1CC-99 354.86 No 404.33 > 90% 481.33 9.59 10.93 13.67 6.19 8.03 14.00 406.71 > 90% 504.25 10.99 14.33 7.80 15.98 433.95 > 90% 476.75 11.73 13.54 9.10 13.96 425.79 > 90%

11.51 8.55 6.19 7.80 15.98 B002 1CC-113 356.47 No 406.16 > 90% 483.56 9.63 10.98 13.74 6.24 8.11 14.13 408.80 > 90% 506.58 11.05 14.39 7.88 16.13 436.19 > 90% 478.95 11.79 13.61 9.20 14.09 427.99 > 90%

11.57 8.64 6.24 7.88 16.13 B003 1CC-127 357.62 No 407.48 > 90% 485.01 9.66 11.01 13.78 6.28 8.16 14.22 410.13 > 90% 508.10 11.08 14.43 7.93 16.23 437.60 > 90% 480.39 11.83 13.65 9.26 14.17 429.37 > 90%

11.60 8.70 6.28 7.93 16.23 B004 1CC-128 353.85 No 403.18 > 90% 480.07 9.56 10.90 13.64 6.15 7.99 13.93 405.56 > 90% 502.93 10.96 14.29 7.76 15.90 432.73 > 90% 475.50 11.69 13.51 9.05 13.88 424.59 > 90%

11.47 8.50 6.15 7.76 15.90 B005 1CS-165 359.61 No 410.47 No 488.70 7.67 8.19 11.69 5.45 6.65 13.21 412.89 No 511.98 8.24 12.24 6.46 15.07 440.55 > 90% 484.05 8.80 11.58 7.54 13.16 432.27 > 90%

8.63 7.08 5.45 6.46 15.07 B006 1CS-166 360.22 No 411.14 No 487.57 7.69 8.21 11.66 5.47 6.67 13.14 413.81 No 510.78 8.26 12.21 6.49 15.00 441.53 > 90% 482.92 8.82 11.55 7.57 13.10 433.23 > 90%

8.65 7.11 5.47 6.49 15.00 B007 1CS-291 348.56 No 398.48 No 473.48 18.46 19.60 26.25 13.72 16.64 31.25 400.83 No 496.02 19.71 27.50 16.17 35.67 427.68 > 90% 468.97 21.03 26.00 18.86 31.15 419.64 > 90%

20.64 17.72 13.72 16.17 35.67 B008 1CS-292 347.91 No 397.77 No 472.66 18.43 19.56 26.20 13.66 16.58 31.15 400.36 No 495.17 19.69 27.45 16.13 35.55 427.18 > 90% 468.16 21.01 25.95 18.82 31.04 419.15 > 90%

20.61 17.68 13.66 16.13 35.55 B011 1SI-3 359.31 No 409.98 No 487.04 19.46 20.79 27.53 8.77 10.69 22.42 413.56 No 510.23 20.98 28.84 10.44 25.59 441.26 > 90% 482.40 22.38 27.27 12.19 22.35 432.97 > 90%

21.96 11.45 8.77 10.44 25.59 B012 1SI-4 356.31 No 406.71 No 483.27 19.30 20.63 27.32 8.62 10.52 22.07 409.10 No 506.29 20.75 28.62 10.22 25.20 436.51 > 90% 478.67 22.14 27.06 11.93 22.00 428.30 > 90%

21.72 11.20 8.62 10.22 25.20 B013 1SI-52 359.53 No 409.65 No 487.29 11.96 13.63 16.95 8.77 11.38 19.64 412.06 No 510.50 13.71 17.76 11.05 22.42 439.67 > 90% 482.65 14.63 16.79 12.90 19.57 431.40 > 90%

14.36 12.12 8.77 11.05 22.42 B014 1SI-86 353.04 No 402.26 No 479.12 11.75 13.39 16.67 8.45 10.97 18.99 405.77 No 501.94 13.50 17.46 10.72 21.67 432.95 > 90% 474.56 14.41 16.51 12.51 18.92 424.81 > 90%

14.14 11.75 8.45 10.72 21.67 B015 1SI-107 362.85 No 413.43 No 491.46 12.07 13.76 17.09 8.93 11.59 19.98 415.87 > 90% 514.87 13.84 17.91 11.26 22.80 443.73 > 90% 486.78 14.77 16.93 13.14 19.91 435.38 > 90%

14.49 12.34 8.93 11.26 22.80 B016 1SW-39 355.42 No 405.81 No 481.34 8.32 8.92 12.56 5.36 6.56 12.81 408.20 No 504.26 8.97 13.15 6.37 14.62 435.54 > 90% 476.76 9.58 12.44 7.43 12.77 427.35 > 90%

9.40 6.98 5.36 6.37 14.62 B017 1SW-40 353.70 No 403.94 No 478.92 8.28 8.88 12.49 5.31 6.50 12.68 406.56 No 501.73 8.94 13.09 6.32 14.48 433.80 > 90% 474.36 9.54 12.37 7.37 12.64 425.64 > 90%

9.36 6.93 5.31 6.32 14.48 B018 1SW-270 358.09 No 408.72 No 485.11 8.68 9.28 12.65 5.63 6.87 13.01 411.12 No 508.21 9.34 13.26 6.68 14.85 438.66 > 90% 480.49 9.97 12.53 7.79 12.97 430.42 > 90%

9.78 7.32 5.63 6.68 14.85 B019 1SW-271 354.78 No 405.09 No 480.90 8.59 9.20 12.55 5.52 6.75 12.79 407.73 No 503.80 9.26 13.14 6.57 14.60 435.04 > 90% 476.32 9.88 12.43 7.66 12.75 426.86 > 90%

9.70 7.20 5.52 6.57 14.60 B020 1SW-274 360.00 No 410.79 No 487.30 8.53 9.14 12.71 5.56 6.80 13.13 413.47 No 510.51 9.20 13.32 6.61 14.99 441.16 > 90% 482.66 9.81 12.59 7.72 13.09 432.87 > 90%

9.63 7.25 5.56 6.61 14.99 B021 1SW-275 360.07 No 410.87 No 487.37 8.51 9.12 12.71 5.55 6.79 13.13 413.54 No 510.57 9.17 13.32 6.60 14.99 441.25 > 90% 482.72 9.79 12.59 7.70 13.09 432.95 > 90%

9.61 7.23 5.55 6.60 14.99 B022a 1AF-55 361.25 No 412.02 No 489.71 20.17 22.12 38.33 10.89 14.56 33.43 415.62 > 90% 513.03 22.31 40.15 14.28 38.16 443.46 > 90% 485.04 23.81 37.96 17.22 33.32 435.12 > 90%

23.36 16.02 10.89 14.28 38.16 B023a 1AF-74 360.64 No 411.36 No 489.10 20.13 22.08 38.28 10.85 14.50 33.35 414.95 > 90% 512.39 22.27 40.10 14.23 38.07 442.74 > 90% 484.44 23.77 37.91 17.15 33.24 434.42 > 90%

23.32 15.96 10.85 14.23 38.07 B024a 1AF-93 361.97 No 412.83 No 490.44 20.21 22.16 38.38 10.95 14.63 33.53 416.43 > 90% 513.79 22.35 40.21 14.35 38.27 444.32 > 90% 485.77 23.85 38.02 17.30 33.42 435.97 > 90%

23.40 16.10 10.95 14.35 38.27 B025 1CC-147 356.58 No 406.29 No 483.55 8.76 9.98 12.61 5.66 7.34 12.93 408.68 No 506.58 10.04 13.22 7.13 14.76 436.06 > 90% 478.94 10.71 12.49 8.32 12.89 427.86 > 90%

10.51 7.82 5.66 7.13 14.76 B026 1CC-167 358.20 No 408.14 No 485.60 8.80 10.02 12.67 5.71 7.41 13.04 410.79 No 508.72 10.09 13.27 7.21 14.88 438.31 > 90% 480.97 10.76 12.55 8.41 13.00 430.07 > 90%

10.56 7.90 5.71 7.21 14.88 B027 1CS-214 353.88 No 403.88 No 480.35 25.40 27.66 37.59 12.59 16.98 32.17 406.26 No 503.22 27.82 39.38 16.54 36.72 433.48 > 90% 475.77 29.69 37.23 19.94 32.06 425.33 > 90%

29.13 18.55 12.59 16.54 36.72 B028 1CS-235 352.57 No 402.42 No 478.36 26.35 28.66 37.44 12.80 17.27 31.90 405.93 No 501.14 28.91 39.22 16.95 36.41 433.13 > 90% 473.80 30.85 37.08 20.43 31.80 424.98 > 90%

30.27 19.01 12.80 16.95 36.41 B029 1CS-238 359.76 No 410.38 No 487.49 26.89 29.23 38.15 13.46 18.14 33.13 412.79 No 510.70 29.40 39.97 17.67 37.82 440.45 > 90% 482.85 31.37 37.79 21.30 33.02 432.16 > 90%

30.78 19.82 13.46 17.67 37.82 B030 1CT-50 357.42 No 407.78 No 484.49 26.71 29.04 37.92 13.24 17.85 32.72 411.09 No 507.56 29.28 39.72 17.49 37.35 438.62 > 90% 479.87 31.24 37.56 21.08 32.62 430.38 > 90%

30.65 19.61 13.24 17.49 37.35 B031 1CT-88 357.56 No 407.93 No 484.66 26.72 29.05 37.93 13.26 17.87 32.75 411.49 No 507.74 29.31 39.74 17.53 37.38 439.06 > 90% 480.05 31.27 37.57 21.13 32.64 430.80 > 90%

30.68 19.66 13.26 17.53 37.38 B032 1CT-102 354.09 No 403.45 No 478.42 3.22 3.67 5.41 2.38 3.09 6.49 406.97 No 501.21 3.70 5.67 3.02 7.41 434.23 > 90% 473.87 3.95 5.36 3.53 6.47 426.07 > 90%

3.88 3.31 2.38 3.02 7.41 B033 1CT-105 353.68 No 402.99 No 477.96 3.30 3.76 5.51 2.39 3.10 6.48 406.25 No 500.72 3.79 5.77 3.03 7.39 433.47 > 90% 473.41 4.04 5.45 3.53 6.46 425.32 > 90%

3.96 3.32 2.39 3.03 7.39 B034 1RC-113 355.50 No 409.83 No 481.83 18.07 20.83 27.23 8.06 10.71 21.94 417.34 > 90% 504.77 21.21 28.53 10.66 25.05 445.30 > 90% 477.24 22.63 26.97 12.44 21.87 436.93 > 90%

22.21 11.68 8.06 10.66 25.05 B035 1RC-115 351.17 No 404.84 No 476.04 17.85 20.57 26.91 7.86 10.45 21.42 412.51 No 498.71 20.96 28.19 10.41 24.45 440.15 > 90% 471.50 22.37 26.65 12.15 21.35 431.87 > 90%

21.95 11.41 7.86 10.41 24.45 B036 1RC-117 356.46 No 410.94 No 482.87 18.12 20.88 27.29 8.10 10.76 22.04 418.73 > 90% 505.87 21.28 28.59 10.73 25.15 446.78 > 90% 478.27 22.71 27.03 12.52 21.97 438.38 > 90%

22.28 11.76 8.10 10.73 25.15 B037 1SW-276 363.69 No 414.69 > 90% 492.26 11.55 12.59 17.12 8.56 10.64 20.04 417.13 > 90% 515.70 12.66 17.94 10.33 22.87 445.07 > 90% 487.57 13.51 16.96 12.06 19.98 436.71 > 90%

13.26 11.33 8.56 10.33 22.87 B038 1CS-745 349.21 No 397.89 No 474.23 11.66 13.28 16.50 8.30 10.77 18.60 401.36 No 496.82 13.40 17.28 10.52 21.23 428.25 > 90% 469.72 14.30 16.34 12.28 18.54 420.20 > 90%

14.03 11.53 8.30 10.52 21.23 B039 1CS-746 353.66 No 404.03 No 479.83 18.39 19.50 26.08 14.14 17.13 32.10 407.31 No 502.68 19.66 27.32 16.71 36.64 434.59 > 90% 475.26 20.98 25.83 19.50 31.99 426.42 > 90%

20.58 18.32 14.14 16.71 36.64 B040 1CT-11 362.00 No 412.80 No 490.43 12.09 13.16 17.06 8.92 11.07 19.89 416.40 > 90% 513.78 13.27 17.87 10.81 22.70 444.29 > 90% 485.76 14.16 16.90 12.62 19.83 435.94 > 90%

13.89 11.85 8.92 10.81 22.70 B041 1CT-12 353.08 No 402.89 No 479.22 11.79 12.84 16.67 8.48 10.54 18.99 406.16 No 502.04 12.94 17.46 10.29 21.68 433.37 > 90% 474.66 13.81 16.51 12.00 18.93 425.22 > 90%

13.55 11.27 8.48 10.29 21.68 B044 1CC-176 379.25 No 403.49 No 479.79 12.61 12.90 16.69 6.50 7.07 13.49 407.02 No 502.64 13.01 17.48 6.91 15.40 434.28 > 90% 475.23 13.88 16.53 8.06 13.45 426.12 > 90%

13.62 7.57 6.50 6.91 15.40 B045 1CC-202 380.14 No 404.42 No 480.85 12.64 12.93 16.73 6.53 7.10 13.55 407.95 No 503.75 13.04 17.52 6.94 15.47 435.28 > 90% 476.27 13.92 16.57 8.10 13.51 427.09 > 90%

13.65 7.61 6.53 6.94 15.47 B046 1CC-207 384.88 No 409.34 No 486.44 12.80 13.09 16.92 6.69 7.28 13.87 411.75 No 509.60 13.16 17.73 7.07 15.83 439.34 > 90% 481.81 14.05 16.76 8.25 13.82 431.08 > 90%

13.78 7.75 6.69 7.07 15.83 B047 1CC-208 381.36 No 403.78 No 482.25 12.68 12.91 16.77 6.57 7.08 13.63 411.93 No 505.21 13.17 17.57 7.08 15.56 439.53 > 90% 477.65 14.05 16.61 8.26 13.58 431.26 > 90%

13.79 7.76 6.57 7.08 15.56 B048 1CC-249 357.36 No 408.06 No 481.46 15.52 16.62 26.69 11.82 14.45 32.32 411.37 No 504.39 16.75 27.96 14.10 36.89 438.93 > 90% 476.88 17.87 26.44 16.45 32.21 430.67 > 90%

17.54 15.45 11.82 14.10 36.89 B049 1CC-251 357.45 No 408.30 No 486.90 18.95 20.10 26.99 14.44 17.49 33.05 416.55 > 90% 510.09 20.50 28.28 17.47 37.73 444.45 > 90% 482.27 21.87 26.73 20.39 32.94 436.10 > 90%

21.46 19.15 14.44 17.47 37.73 B050 1CC-252 379.14 No 407.58 No 479.60 20.10 21.61 26.59 16.24 18.77 32.07 N/A During EDG Operation N/A During EDG Operation N/A During EDG Operation 16.24 18.77 32.07

ATTACHMENT B TORQUE CALCULATIONS CALCULATION E5-0001 PAGE B2, REV. 15 TABLE B1 AC VAM MINIMUM AND MAXIMUM TORQUE Offsite Power Available EDG Operating at T/S Variation Levels EDG Operating at EC 84102 Variation Levels EDG at Voltage Regulator Level

SUMMARY

Doc.

CP&L Motor Terminal Voltage Motor LRA MOTOR TORQUE Motor Term Voltage Motor LRA Motor Torque Motor Term Voltage Motor LRA Motor Torque Mtr Term Volt Mtr LRA Mtr T MOTOR TORQUE Note No.

Tag No Trans > 90% Lo SS > 90%

Hi Trans Lo SS Hi Trans Lo SS Max Lo SS > 90%

Hi Lo SS Hi Lo SS Max Lo SS > 90%

Hi Lo SS Hi Lo SS Max Lo SS > 90%

Lo SS Lo SS Trans Lo SS Max 5 & 6 B051 1CC-297 385.71 No 410.22 No 487.65 10.51 10.80 16.96 5.51 6.02 13.94 413.54 No 510.87 10.89 17.77 5.87 15.91 441.25 > 90% 483.01 11.62 16.80 6.85 13.89 432.95 > 90%

11.40 6.44 5.51 5.87 15.91 B052 1CC-299 354.31 No 404.23 No 480.64 11.78 12.92 16.72 5.67 7.10 13.54 407.76 No 503.53 13.04 17.51 6.93 15.45 435.08 > 90% 476.06 13.91 16.56 8.09 13.49 426.90 > 90%

13.65 7.60 5.67 6.93 15.45 B053 1CS-182 358.34 No 408.74 No 485.96 11.97 13.03 16.90 8.74 10.85 19.53 411.40 No 509.10 13.11 17.71 10.56 22.29 438.96 > 90% 481.33 13.99 16.74 12.32 19.47 430.71 > 90%

13.73 11.57 8.74 10.56 22.29 B054 1CS-196 350.55 No 400.09 No 476.15 11.71 12.75 16.56 8.36 10.40 18.75 402.69 No 498.82 12.84 17.35 10.11 21.40 429.67 > 90% 471.61 13.70 16.40 11.80 18.69 421.59 > 90%

13.44 11.08 8.36 10.11 21.40 B055 1CS-210 350.31 No 399.82 No 475.84 11.70 12.74 16.55 8.35 10.38 18.73 402.42 No 498.50 12.83 17.34 10.10 21.37 429.38 > 90% 471.31 13.69 16.39 11.79 18.67 421.30 > 90%

13.43 11.07 8.35 10.10 21.37 B056 1CS-217 349.24 No 397.93 No 474.51 8.75 9.97 12.38 8.30 10.78 18.62 400.52 No 497.10 10.03 12.97 10.48 21.25 427.35 > 90% 469.99 10.70 12.26 12.23 18.56 419.31 > 90%

10.50 11.49 8.30 10.48 21.25 B057 1CS-218 356.49 No 406.19 No 483.54 8.93 10.17 12.61 8.65 11.23 19.34 408.58 No 506.57 10.23 13.21 10.91 22.07 435.95 > 90% 478.94 10.92 12.49 12.73 19.27 427.75 > 90%

10.71 11.96 8.65 10.91 22.07 B058 1CS-219 356.47 No 406.17 No 483.52 8.93 10.17 12.61 8.65 11.23 19.34 408.56 No 506.55 10.23 13.21 10.91 22.07 435.93 > 90% 478.92 10.92 12.49 12.73 19.27 427.74 > 90%

10.71 11.95 8.65 10.91 22.07 B059 1CS-220 356.19 No 405.85 No 483.18 8.92 10.17 12.60 8.64 11.21 19.31 408.49 No 506.18 10.23 13.20 10.90 22.04 435.85 > 90% 478.57 10.92 12.48 12.72 19.24 427.66 > 90%

10.71 11.95 8.64 10.90 22.04 B061 1CS-341 349.40 No 398.11 No 474.50 8.73 9.94 12.38 5.52 7.17 12.45 401.58 No 497.10 10.03 12.97 7.00 14.21 428.48 > 90% 469.98 10.70 12.26 8.17 12.41 420.42 > 90%

10.50 7.68 5.52 7.00 14.21 B062 1CS-382 351.99 No 401.06 No 477.79 8.79 10.02 12.46 5.61 7.28 12.62 404.56 No 500.54 10.10 13.06 7.11 14.41 431.66 > 90% 473.24 10.78 12.35 8.30 12.58 423.55 > 90%

10.58 7.79 5.61 7.11 14.41 B063 1CS-423 351.35 No 400.33 No 476.97 8.77 10.00 12.44 5.58 7.25 12.58 403.82 No 499.69 10.08 13.04 7.08 14.36 430.87 > 90% 472.43 10.76 12.32 8.26 12.54 422.77 > 90%

10.56 7.76 5.58 7.08 14.36 B064 1CS-470 357.05 No 407.60 No 484.10 7.33 7.90 12.63 4.74 5.84 12.96 410.91 No 507.16 7.97 13.23 5.69 14.79 438.43 > 90% 479.49 8.50 12.51 6.65 12.92 430.19 > 90%

8.34 6.24 4.74 5.69 14.79 B065 1CS-472 351.55 No 401.53 No 477.17 8.78 9.39 12.45 5.59 6.83 12.59 405.03 No 499.89 9.47 13.04 6.67 14.37 432.16 > 90% 472.62 10.11 12.33 7.79 12.55 424.04 > 90%

9.92 7.31 5.59 6.67 14.37 B066 1CS-752 346.08 No 395.79 No 470.29 17.99 19.10 25.56 13.54 16.44 30.83 399.24 No 492.68 19.27 26.78 16.06 35.19 425.99 > 90% 465.81 20.56 25.32 18.74 30.73 417.98 > 90%

20.18 17.60 13.54 16.06 35.19 B067 1CS-753 350.43 No 399.28 No 475.87 11.69 13.33 16.55 8.35 10.84 18.73 402.52 No 498.53 13.43 17.34 10.58 21.38 429.48 > 90% 471.34 14.33 16.39 12.35 18.67 421.41 > 90%

14.06 11.60 8.35 10.58 21.38 B068 1CT-26 345.67 No 393.86 No 470.05 3.60 4.11 5.11 2.71 3.52 6.26 396.18 No 492.43 4.13 5.35 3.42 7.15 422.72 > 90% 465.57 4.41 5.06 3.99 6.24 414.77 > 90%

4.33 3.74 2.71 3.42 7.15 B070 1CT-71 352.05 No 401.13 No 478.41 3.67 4.18 5.20 2.81 3.65 6.49 404.63 No 501.19 4.22 5.45 3.56 7.41 431.73 > 90% 473.86 4.50 5.15 4.16 6.47 423.62 > 90%

4.42 3.91 2.81 3.56 7.41 B072 1ED-94 337.95 No 385.40 No 456.25 3.23 3.64 5.46 2.16 2.77 5.90 388.53 No 477.98 3.67 5.71 2.71 6.74 414.55 > 90% 451.90 3.92 5.40 3.16 5.88 406.76 No 3.84 2.97 2.16 2.71 6.74 B073 1ED-95 350.33 No 399.35 No 476.36 4.03 4.53 5.70 2.79 3.58 6.43 402.83 No 499.04 4.57 5.97 3.50 7.34 429.82 > 90% 471.82 4.88 5.64 4.08 6.41 421.74 > 90%

4.79 3.83 2.79 3.50 7.34 B076 1RH-25 342.79 No 390.57 No 473.53 17.76 20.23 25.74 13.23 17.18 31.26 392.88 No 496.07 20.35 26.96 16.69 35.68 419.19 > 90% 469.02 21.72 25.49 19.47 31.16 411.31 No 21.31 18.29 13.23 16.69 35.68 B077 1RH-31 361.18 No 412.16 No 489.37 8.25 8.78 11.70 5.89 7.15 13.24 414.59 > 90% 512.67 8.83 12.26 6.94 15.11 442.36 > 90% 484.71 9.42 11.59 8.10 13.20 434.05 > 90%

9.24 7.61 5.89 6.94 15.11 B080 1RH-63 351.98 No 401.05 No 482.80 18.24 20.78 26.24 13.95 18.11 32.50 403.66 No 505.79 20.91 27.49 17.62 37.09 430.70 > 90% 478.20 22.31 25.99 20.56 32.39 422.60 > 90%

21.89 19.31 13.95 17.62 37.09 B081 1RH-69 361.24 No 412.23 No 489.45 8.25 8.78 11.70 5.89 7.15 13.25 415.83 > 90% 512.75 8.85 12.26 6.99 15.12 443.68 > 90% 484.78 9.45 11.59 8.15 13.20 435.34 > 90%

9.27 7.66 5.89 6.99 15.12 B085 1SI-300 360.13 No 410.62 No 486.91 71.55 79.06 115.80 30.72 38.70 88.51 413.95 > 90% 510.09 79.70 121.31 37.76 101.03 441.68 > 90% 482.27 85.04 114.70 44.06 88.22 433.38 > 90%

83.44 41.39 30.72 37.76 101.03 B086 1SI-301 359.72 No 410.16 No 486.35 71.47 78.97 115.67 30.65 38.62 88.31 413.74 No 509.51 79.66 121.17 37.72 100.80 441.46 > 90% 481.72 84.99 114.56 44.02 88.02 433.16 > 90%

83.39 41.35 30.65 37.72 100.80 B087 1SI-310 360.76 No 411.39 No 488.61 70.93 77.92 100.16 35.40 44.34 95.90 414.73 > 90% 511.87 78.55 104.93 43.26 109.46 442.51 > 90% 483.95 83.82 99.21 50.48 95.59 434.19 > 90%

82.24 47.42 35.40 43.26 109.46 B088 1SI-311 361.02 No 411.67 No 488.93 70.98 77.98 100.23 35.45 44.40 96.03 415.27 > 90% 512.21 78.66 105.00 43.37 109.61 443.09 > 90% 484.27 83.93 99.28 50.61 95.72 434.75 > 90%

82.35 47.54 35.45 43.37 109.61 B089 1SI-322 360.97 No 411.29 No 488.87 70.97 80.87 100.22 35.44 46.01 96.00 413.71 No 512.15 81.34 104.99 44.69 109.58 441.43 > 90% 484.21 86.79 99.26 52.15 95.69 433.13 > 90%

85.16 48.98 35.44 44.69 109.58 B090 1SI-323 360.03 No 410.22 No 487.87 82.87 94.42 116.03 35.57 46.18 88.86 413.80 No 511.10 95.24 121.55 45.11 101.43 441.52 > 90% 483.22 101.62 114.92 52.64 88.57 433.22 > 90%

99.71 49.44 35.57 45.11 101.43 B091 1SI-326 361.91 No 412.37 No 490.20 55.11 62.80 77.47 23.86 30.97 56.78 414.80 > 90% 513.54 63.17 81.16 30.09 64.81 442.58 > 90% 485.53 67.40 76.73 35.11 56.59 434.26 > 90%

66.13 32.98 23.86 30.09 64.81 B092 1SI-327 357.36 No 407.18 No 484.39 45.37 51.70 64.23 23.12 30.01 55.44 410.74 No 507.46 52.15 67.29 29.31 63.28 438.25 > 90% 479.78 55.65 63.62 34.21 55.26 430.01 > 90%

54.60 32.13 23.12 29.31 63.28 B093 1SI-340 352.91 No 402.11 No 478.60 100.04 113.98 141.50 45.15 58.61 113.66 404.48 No 501.40 114.65 148.24 56.93 129.74 431.57 > 90% 474.05 122.33 140.15 66.43 113.29 423.46 > 90%

120.03 62.40 45.15 56.93 129.74 B094 1SI-341 357.36 No 407.18 No 484.26 101.30 115.43 143.17 46.29 60.10 116.37 410.74 No 507.32 116.43 149.99 58.71 132.82 438.25 > 90% 479.65 124.23 141.81 68.51 115.99 430.01 > 90%

121.90 64.35 46.29 58.71 132.82 B095 1SI-359 357.26 No 407.07 No 484.10 101.10 115.19 143.12 46.19 59.96 116.29 409.47 No 507.15 115.87 149.94 58.24 132.73 436.90 > 90% 479.49 123.63 141.76 67.97 115.91 428.68 > 90%

121.31 63.84 46.19 58.24 132.73 B096 1SW-91 352.23 No 401.34 No 478.41 3.37 3.84 4.78 2.81 3.65 6.49 404.59 No 501.19 3.88 5.01 3.56 7.41 431.70 > 90% 473.85 4.13 4.74 4.15 6.47 423.58 > 90%

4.06 3.90 2.81 3.56 7.41 B097 1SW-92 352.77 No 401.94 No 479.08 3.38 3.85 4.79 2.82 3.66 6.51 405.21 No 501.90 3.88 5.02 3.57 7.43 432.35 > 90% 474.52 4.14 4.75 4.16 6.49 424.22 > 90%

4.06 3.91 2.82 3.57 7.43 B098 1SW-97 352.76 No 401.94 No 479.08 3.38 3.85 4.79 2.82 3.66 6.51 405.20 No 501.89 3.88 5.02 3.57 7.43 432.34 > 90% 474.51 4.14 4.75 4.16 6.49 424.21 > 90%

4.06 3.91 2.82 3.57 7.43 B099 1SW-98 351.96 No 401.03 No 478.06 3.37 3.84 4.78 2.80 3.64 6.48 404.53 No 500.83 3.87 5.01 3.56 7.40 431.63 > 90% 473.51 4.13 4.74 4.15 6.46 423.51 > 90%

4.06 3.90 2.80 3.56 7.40 B100 1SW-109 352.23 No 401.34 No 478.41 3.37 3.84 4.78 2.81 3.65 6.49 404.59 No 501.19 3.88 5.01 3.56 7.41 431.70 > 90% 473.85 4.13 4.74 4.15 6.47 423.58 > 90%

4.06 3.90 2.81 3.56 7.41 B101 1SW-110 346.63 No 394.96 No 470.98 3.32 3.78 4.71 2.72 3.53 6.29 398.40 No 493.40 3.82 4.93 3.45 7.18 425.09 > 90% 466.49 4.07 4.66 4.02 6.27 417.10 > 90%

3.99 3.78 2.72 3.45 7.18 B110 1SW-225 351.97 No 401.04 No 478.07 3.37 3.84 4.78 2.80 3.64 6.48 404.54 No 500.84 3.87 5.01 3.56 7.40 431.64 > 90% 473.52 4.13 4.74 4.15 6.46 423.52 > 90%

4.06 3.90 2.80 3.56 7.40 B111 1SW-227 346.62 No 394.94 No 470.96 3.32 3.78 4.71 2.72 3.53 6.29 398.39 No 493.39 3.82 4.93 3.45 7.18 425.08 > 90% 466.47 4.07 4.66 4.02 6.27 417.09 > 90%

3.99 3.78 2.72 3.45 7.18 B074A 1RH-1 360.56 No 410.83 No 488.16 27.46 31.29 40.33 22.66 29.41 55.18 414.41 > 90% 511.41 31.56 42.25 28.73 62.99 442.17 > 90% 483.51 33.68 39.94 33.53 55.00 433.86 > 90%

33.04 31.49 22.66 28.73 62.99 B074B 1RH-1 358.35 No 408.31 No 485.29 27.29 31.10 40.09 22.38 29.05 54.54 411.62 No 508.40 31.35 42.00 28.35 62.25 439.19 > 90% 480.67 33.45 39.71 33.08 54.36 430.93 > 90%

32.82 31.07 22.38 28.35 62.25 B075 1RH-2 355.49 No 405.05 No 481.58 37.64 42.89 55.80 32.74 42.51 84.39 408.34 No 504.51 43.23 58.46 41.47 96.33 435.69 > 90% 476.99 46.13 55.27 48.40 84.12 427.50 > 90%

45.26 45.46 32.74 41.47 96.33

ATTACHMENT B TORQUE CALCULATIONS CALCULATION E5-0001 PAGE B3, REV. 15 TABLE B1 AC VAM MINIMUM AND MAXIMUM TORQUE Offsite Power Available EDG Operating at T/S Variation Levels EDG Operating at EC 84102 Variation Levels EDG at Voltage Regulator Level

SUMMARY

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CP&L Motor Terminal Voltage Motor LRA MOTOR TORQUE Motor Term Voltage Motor LRA Motor Torque Motor Term Voltage Motor LRA Motor Torque Mtr Term Volt Mtr LRA Mtr T MOTOR TORQUE Note No.

Tag No Trans > 90% Lo SS > 90%

Hi Trans Lo SS Hi Trans Lo SS Max Lo SS > 90%

Hi Lo SS Hi Lo SS Max Lo SS > 90%

Hi Lo SS Hi Lo SS Max Lo SS > 90%

Lo SS Lo SS Trans Lo SS Max 5 & 6 B078 1RH-39 358.27 No 408.21 No 485.21 27.14 30.92 40.08 22.25 28.88 54.52 411.77 No 508.32 31.19 41.99 28.21 62.23 439.36 > 90% 480.59 33.28 39.70 32.92 54.34 431.10 > 90%

32.65 30.92 22.25 28.21 62.23 B079A 1RH-40 362.24 No 412.74 No 490.20 27.44 31.26 40.49 22.74 29.53 55.64 416.09 > 90% 513.54 31.52 42.42 28.81 63.51 443.96 > 90% 485.53 33.63 40.11 33.62 55.46 435.61 > 90%

32.99 31.57 22.74 28.81 63.51 B079B 1RH-40 361.28 No 411.65 No 488.96 27.36 31.18 40.39 22.62 29.37 55.36 415.24 > 90% 512.24 31.45 42.32 28.69 63.19 443.06 > 90% 484.30 33.56 40.01 33.48 55.18 434.73 > 90%

32.93 31.45 22.62 28.69 63.19 B112 1SW-124 333.26 No 379.72 No 454.31 1.39 1.58 1.98 1.01 1.30 2.63 381.96 No 475.94 1.59 2.07 1.27 3.01 407.55 No 449.98 1.70 1.96 1.48 2.62 399.89 No 1.66 1.39 1.01 1.27 3.01 B113 1SW-129 333.09 No 379.53 No 454.09 1.39 1.58 1.97 1.00 1.30 2.63 381.99 No 475.71 1.59 2.07 1.27 3.00 407.58 No 449.76 1.70 1.96 1.48 2.62 399.92 No 1.66 1.39 1.00 1.27 3.00 B114 1SW-130 333.05 No 379.48 No 454.03 1.39 1.58 1.97 1.00 1.30 2.63 381.94 No 475.65 1.59 2.07 1.27 3.00 407.53 No 449.71 1.70 1.96 1.48 2.62 399.87 No 1.66 1.39 1.00 1.27 3.00 B102 1SW-121 333.57 No 380.07 No 457.76 1.39 1.58 1.99 1.01 1.31 2.67 382.31 No 479.56 1.59 2.09 1.27 3.05 407.92 No 453.40 1.70 1.97 1.48 2.67 400.25 No 1.67 1.39 1.01 1.27 3.05 B103 1SW-123 333.54 No 380.04 No 457.73 1.39 1.58 1.99 1.01 1.31 2.67 382.28 No 479.52 1.59 2.08 1.27 3.05 407.89 No 453.37 1.70 1.97 1.48 2.66 400.22 No 1.67 1.39 1.01 1.27 3.05 B105 1SW-126 333.28 No 379.75 No 454.33 1.39 1.58 1.98 1.01 1.31 2.63 381.98 No 475.97 1.59 2.07 1.27 3.01 407.57 No 450.00 1.70 1.96 1.48 2.63 399.91 No 1.66 1.39 1.01 1.27 3.01 B106 1SW-127 333.11 No 379.55 No 454.11 1.39 1.58 1.97 1.00 1.30 2.63 382.02 No 475.73 1.59 2.07 1.27 3.00 407.61 No 449.78 1.70 1.96 1.48 2.62 399.94 No 1.66 1.39 1.00 1.27 3.00 B109 1SW-132 333.54 No 380.04 No 457.73 1.39 1.58 1.99 1.01 1.31 2.67 382.51 No 479.53 1.59 2.08 1.27 3.05 408.14 No 453.37 1.70 1.97 1.48 2.66 400.46 No 1.67 1.39 1.01 1.27 3.05

ATTACHMENT B TORQUE CALCULATIONS CALCULATION E5-0001 PAGE B17, REV. 13 NOTES FOR TABLES B1 THROUGH B9 

1 All applicable MCC starters are NEMA Size 1.

2 EST-1 is not used. EST-2 is based on vendor curve M2734. EST-3 is based on vendor curve M1468. EST-4 is based on vendor curve SK-59446. See Section 4.5.13 for bases.

3 See Section 4.3 for methodology used in the performance of torque calculations.

4 See Section 4.4 for sources of input data.

5 For valves marked with an asterisk (*), MOV actuator will not receive an automatic start signal during safeguards sequencing. For these valves, steady-state minimum torque should be used in the Mechanical "setup" calculations. The calculated steady-state torque for these motors does not include the heating effect from a postulated 3 second stall since they would not be called upon to stroke simultaneous with the starting of a large motor. No "delay time" need be considered in the Mechanical "setup" calculations due to a postulated stall.

6 For valves not marked with an asterisk (*), the MOV actuator can receive an automatic start signal during safeguards sequencing. For these valves, steady-state minimum torque may be used in lieu of transient minimum torque based on the justification in Attachment D. The steady-state minimum torque values include the effects of motor "heatup" due to pulling locked rotor current during the postulated stall under transient conditions. A "delay time" must be considered in the Mechanical "setup" calculations to account for the postulated stall. MOVs marked with a "$",

have two functions, containment isolation (operates during safeguards sequencing) and RCP thermal barrier tube rupture (does not operate during safeguards sequencing). For the containment isolation function, the applicable MOV setup calculations utilize low transient torque values; however, the low steady-state torque values may be used if desired since they include motor heat-up assuming a 3-second stall. For the RCP thermal barrier tube rupture function, the low steady-state torque value should be used. Note that this value is conservative for the RCP thermal barrier tube rupture scenario since the calculated torque value assumes a 3-second motor stall (which does not need to be considered for non-LOCA sequencing scenarios).

7 Motor temperature rise shown on Table B8 is the same value for use in transient and steady-state minimum torque calculations. The MOV will not be called upon to operate during safeguards sequencing and therefore would not attempt to start during a severe voltage transient caused by the simultaneous starting of a large motor. Therefore, there will not be a postulated "stall" and the motor will not experience the additional temperature rise associated with a stall.

8 Motor temperature rise shown on Table B8 is higher for use in steady-state minimum torque calculations since the motor can receive an auto-start signal during safeguards sequencing. It has been assumed that the motor receives an autostart signal simultaneous with a large motor starting and stalls for 3 seconds. The assumed stall will heat up the motor due to the sustained locked rotor current.

9 Cable "ID" on Table B2 is an identifier which refers to the cable information found in Table B4.

10 On Table B2, the motor temperature rise labeled as "norm" is used in the calculation of minimum transient torque and does not include motor temperature rise due to an assumed stall. The motor temperature rise labeled as "stall" is used in the calculation of minimum steady-state torque. For those motors identified as capable of starting during safeguards sequencing, this temperature rise value includes an assumed stall temperature rise. If not identified as capable of auto-starting during sequencing, the "stall" temperature rise does not include an assumed stall and is the same value as the "norm" temperature rise.

11 In Table B1, the formula used to calculate "Trans" and "Lo SS" Motor Torque for 25 ft-lb, 3600 rpm motors (1AF-55, 1AF-74, 1AF-93, 1CS-214, 1CS-235, 1CS-238, 1CT-50 & 1CT-88) is different than the formula used for the other MOVs. Per Rev 8 of EGR-NGGC-0101 (Page 19), for this particular motor, the voltage ratio must be raised to an exponent of 2.5 (instead of 2).

12 In Table B2, the Tran MCC Voltage is 400vac for MOVs 1CC-176, 1CC-202, 1CC-207, 1CC-208, and 1CC-297 (refer to EC 84363 ).

Notes 1-4 are not applicable to Table B1 Notes 7-12 are not applicable to Table B1

• • • The notes on this page that are not applicable to Table B1 have been removed as this information is unnecessary.