ML12209A175
| ML12209A175 | |
| Person / Time | |
|---|---|
| Site: | Mcguire, McGuire  |
| Issue date: | 07/16/2012 |
| From: | Repko R Duke Energy Carolinas |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| TAC ME8213, TAC ME8214 | |
| Download: ML12209A175 (11) | |
Text
Duke REGIS T.REPKO I En~uery wrEnrgy. VicePrsdn McGuire Nuclear Station Duke Energy MG01 VP / 12700 Hagers Ferry Rd.
Huntersville, NC 28078 980-875-4111 980-875-4809 fax regis.repko@duke-energy. corn July 16, 2012 10 CFR 50.90 U. S&Nuclear Regulatory Commission Washington, D.C. 20555 ATTENTION: Document Control Desk
Subject:
Duke Energy Carolinas, LLC (Duke Energy)
McGuire Nuclear Station, Units 1 and 2 Docket Nos. 50-369 and 50-370 Response to Request for Additional Information Regarding License Amendment Related to Measurement Uncertainty Recapture Power Uprate (TAC Nos. ME8213 and ME8214)
This letter provides the responses to a June 15, 2012 Nuclear Regulatory Commission (NRC) request for additional information (RAI) related to a March 5, 2012 McGuire Nuclear Station (MNS) Units 1 and 2 License Amendment Request (LAR) submitted pursuant to 10 CFR 50.90 in support of a measurement uncertainty recapture (MUR) power uprate.
NRC MUR LAR RAI questions 32 through 40 and Duke Energy's response are provided in Enclosures 1, 2, and 3. Responses to MNS MUR LAR RAI questions 1 through 3 and questions 5 through 19 were provided to the NRC via correspondence dated May 29, 2012 and June 21, 2012 respectively. Responses to MNS MUR LAR RAI question 4 and questions 20 through 31 were provided to the NRC via correspondence dated July 6, 2012.
Enclosures 2 and 3 contain sensitive information. Duke Energy requests that Enclosures 2 and 3 be withheld from public disclosure per 10 CFR 2.390(d)(1). Upon removal of Enclosures 2 and 3, this letter is uncontrolled.
The conclusions reached in the original determination that this LAR contains No Significant Hazards Considerations and the basis for the categorical exclusion from performing an Environmental/Impact Statement have not changed as a result of the RAI responses provided in this submittal.
Please contact Kenneth L. Ashe at 980-875-4535 if additional questions arise regarding this LAR.
Ao- o www. duke-energy,corn
July 16, 2012 Nuclear Regulatory Commission Page 2 Sincerely, R. T. Repko Enclosures cc: w/enclosures V. M. McCree Regional Administrator, Region II U.S. Nuclear Regulatory Commission Marquis One Tower 245 Peachtree Center Ave., NE, Suite 1200 Atlanta, GA 30303-1257 J. H. Thompson (addressee only)
Project Manager (MNS)
U.S. Nuclear Regulatory Commission 11555 Rockville Pike Mail Stop 0-8 G9A Rockville, MD, 20852-2738 J. Zeiler NRC Senior Resident Inspector McGuire Nuclear Station W. L. Cox III, Section Chief North Carolina Department of Environment and Natural Resources Division of Environmental Health Radiation Protection Section 1645 Mail Service Center Raleigh, NC 27699-1645
July 16, 2012 Nuclear Regulatory Commission Page 3 OATH AND AFFIRMATION Regis T. Repko affirms that he is the person who subscribed his name to the foregoing statement, and that all the matters and facts set forth herein are true and correct to the best of his knowledge.
Regis T. Repko, Vice-President, McGuire Nuclear Station Subscribed and sworn to me: -rY, ', -OZ2-Date AtryPublic My commission expires: _I Z'0i1 Date
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OF NUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORT A MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATE Enclosure 1 McGuire Nuclear Station's Responses to MUR LAR RAI Questions 32 through 40 In The June 15, 2012 NRC Request for Additional Information NRC Question 32 Provide details of the load increases at various voltage levels of the Alternating Current (AC) distribution system (13.8 kiloVolt (kV) and 6.9 kV normal auxiliary system, 4.16 kV essential auxiliary system, and 600 volt (V) normal and essential systems) due to the Measurement Uncertainty Recapture (MUR) power uprate and High Pressure (HP) turbine replacement.
McGuire Response to NRC Question 32 As discussed in Section V.1 of the LAR, the McGuire AC electrical systems were reviewed and found to have adequate capacity at MUR uprate conditions and are bounded by existing analyses and calculations. The following are the expected AC electrical load increases due to the MUR uprate and HP turbine replacement project as determined during evaluations of McGuire systems:
System Rated Pre-MUR Post-MUR Percent Load Voltage Horsepower Brake Brake Change Horsepower Horsepower Condensate Pumps 6.9kV 1500 1289 1304 1.2 Condensate Booster 6.9kV 3000 2305 2329 1.1 Pumps Feedwater Heater C Drain 6.9kV 1250 1133 1134 0.1 Pumps Feedwater Heater G Drain 600V 250 190.6 191.0 0.2 Pumps Since (a) the expected load changes are quite small, (b) post-MUR pump Brake Horsepowers are well below the rated motor nameplate HPs and (c) margins well beyond the Page 1 of 8
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OF NUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORT A MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATE expected load increases are available in the current AC electrical power analyses, the load changes were deemed bound by the existing analyses.
NRC Question 33 Provide a list and brief discussion of the electrical analysis and calculations which the licensee reviewed or updated to determine that the AC distribution system(s) remain bounded by the existing analysis and calculations of record.
McGuire Response to NRC Question 33 The electrical calculations of record that were reviewed to determine the impact of MUR on AC distribution system(s) are listed in the following table. This review determined that the AC distribution system(s) remain bounded by the existing analysis and calculations of record.
Number Title Description MCC- Station Blackout Coping Study This calculation documents the ability of 1381.05- installed equipment to cope with a Station 00-0199 Blackout (SBO) within the guidelines of NUMARC 87-00, Revision 1.
MCC- U1/2 AC Auxiliary Power This calculation documents the AC Auxiliary 1381.05- System ETAP Model Base File Power System component design input data 00-0257 (including modeled loads) that is subsequently used for AC system ETAP (output) calculations.
MCC- Unit 1, 6.9kv, 4.16kv, and 600 This (output) calculation documents ETAP load 1381.05- volt Auxiliary Power System flow / voltage drop analyses of the Unit 1 AC 00-0258 Safety Related Voltage Auxiliary Power Systems.
Analysis MCC- Unit 2, 6.9kv, 4.16kv, and 600 This (output) calculation documents ETAP load 1381.05- volt Auxiliary Power System flow / voltage drop analyses of the Unit 2 AC 00-0263 Safety Related Voltage Auxiliary Power Systems.
Analysis Page 2 of 8
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OF NUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORT A MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATE Number Title Description MCC- U1, 4.16kV Essential Auxiliary This calculation documents the dynamic loading 1381.05- Power System (EPC) Diesel- (and voltage drop) of the Unit 1 Emergency 00-0260 Generator Dynamic Loading Diesel Generators (EDGs) and associated Analysis, Using ETAP Essential Power Systems.
MCC- U2, 4.16 KV Essential Auxiliary This calculation documents the dynamic loading 1381.05- Power System (EPC) Diesel (and voltage drop) of the Unit 2 EDGs and 00-0266 Generator Dynamic Loading associated Essential Power Systems.
Analysis, Using ETAP MCC- U2 6.9kV, 4.16kV & 600V This (output) calculation documents ETAP short 1381.05- Auxiliary Power Systems Short circuit analyses of the Unit 2 AC Auxiliary 00-0265 Circuit Analysis Power Systems.
MCC- Ul 6.9kV, 4.16kV & 600V This (output) calculation documents ETAP short 1381.05- Auxiliary Power Systems Short circuit analyses of the Unit 1 AC Auxiliary 00-0301 Circuit Analysis Power Systems.
MCC- U 1/2, 24kV Unit Main Power This calculation documents the 3-phase fault 1381.06- System (EPA) Generator Circuit currents through the Unit 1 and Unit 2 24kV 00-0007 Breaker Short Circuit Analysis generator circuit breakers, step-up transformers and associated components.
MCC- Design Calculations for This calculation documents the 3-phase fault 1381.06- Determining Short Circuit currents at various Isolated Phase Bus (IPB) 00-0008 Capabilities of Isolated Phase locations.
Buses MCC- Protective Relay Setting This calculation determines the settings for 1381.06- Calculation for Units 1 & 2 devices protecting Main Power System 00-0019 Generators, 24kV IPB and equipment (e.g. Main Generators, 24KV IPB, Transformers Main Step Up and Unit Auxiliary Transformers).
MCC- U1/2, SSF Diesel-Generator This calculation determines the maximum 1381.06- (D/G) Loading Analysis steady-state load expected for the Safe 00-0054 Shutdown Facility (SSF) D/G.
Page 3 of 8
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OF NUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORT A MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATE Number Title Description MCC- Main Generator Voltage This calculation documents the basis for the 1381.06- Regulator Limiters and Unit 1 and Unit 2 main generator voltage 00-0067 Protection Setting Calculation regulator limiter and protection settings.
MCC- Unit 1 Main Generator Relay This calculation documents the settings for the 1381.06- Settings for the SEL-300G and Unit 1 main generator microprocessor-based 00-0073 Beckwith 3425 Relays protective relays.
MCC- Unit 2 Main Generator Relay This calculation documents the settings for the 1381.06- Settings for the SEL-300G and Unit 2 main generator microprocessor-based 00-0076 Beckwith 3425 Relays protective relays.
NRC Question 34 Provide a discussion regarding any impact on generator protective relaying due to the increase in the main generator rating.
McGuire ResDonse to NRC Question 34 The MUR alone has no impact on generator protective relaying. However, the main generator stator replacement project will have an impact on the settings of the generator protective relays since the current settings are based upon the current generator rating of 1330 MVA (Unit 1) and 1380 MVA (Unit 2) versus the increased rating of 1450 MVA for both Units following generator stator replacement. The new settings for the generator protective relaying have been determined and incorporated into approved calculations.
NRC Question 35 Provide a discussion of power source(s) for the new Cameron CheckPlus leading edge flow meter.
McGuire Response to NRC Question 35 The power for the Leading Edge Flow Meter (LEFM) equipment will be supplied by battery backed, non-vital, 120VAC sources 1 KDCS1 for Unit 1 and 2KDCS1 for Unit 2. Primary power for the MODBUS servers will be supplied by battery backed, non-vital, 120VAC sources 1 KU for Unit 1 and 2KU for Unit 2. Backup power to the Unit 1 and Unit 2 MODBUS equipment will be Page 4 of 8
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OF NUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORT A MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATE supplied by 1 KDCS1 for Unit 1 and 2KDCS1 for Unit 2. These power sources have sufficient margin to accommodate the power load associated with the new Cameron CheckPlus leading edge flow meter.
NRC Question 36 Provide a copy of the current One Line Diagrams of 250 V Direct Current (DC) Auxiliary Power System, 125 V DC and 240/120 V AC Auxiliary Control Power System, and safety-related 125 V DC and 120 V Vital Instrument and Control Power System.
McGuire Response to NRC Question 36 Reference Enclosure 2 for copies of the current One Line Diagrams of the site 250 VDC Auxiliary Power System, 125 VDC and 240/120 VAC Auxiliary Control Power System, and safety-related 125 VDC and 120 V Vital Instrument and Control Power System.
NRC Question 37 Provide details of any load increases on the 250 V DC Auxiliary Power System, 125 V DC and Power System, and safety-related 125 V DC and 120 V Vital Instrument and Control Power System due to the MUR power uprate and HP turbine replacement.
McGuire Response to NRC Question 37 Existing margin in plant electrical systems can accommodate the power load associated with the new Cameron CheckPlus LEFM (refer to the response to RAI Question 35). No other load changes are identified for the 250 V DC Auxiliary Power System, 125 V DC and Power System, and safety-related 125 V DC and 120 V Vital Instrument and Control Power System due to the MUR uprate and HP turbine replacement project.
Page 5 of 8
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OF NUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORT A MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATE NRC Question 38 Provide a list and brief discussion of the electrical analysis and calculations which the licensee reviewed or updated to determine that the DC distribution system(s) [including 240/120 V AC Auxiliary Control and 120 V Vital Instrument and Control Power Systems] remain bounded by the existing analysis and calculations of record.
McGuire Response to NRC Question 38 The electrical calculations of record that were reviewed to determine the impact of MUR on DC distribution system(s) [including 240/120 V AC Auxiliary Control and 120 V Vital Instrument and Control Power Systems] are listed in the following table. This review determined that these systems remain bounded by the existing analysis and calculations of record.
Number Title Description MCC- U1/2, Essential Diesel Generator This (output) calculation verifies that the 1381.05- (D/G) 125VDC Auxiliary Power existing EDG 125 VDC batteries and chargers 00-0195 System (EPQ) Battery and are adequately sized for the expected load Charger Sizing profile.
MCC- U1/2, 125VDC Essential Diesel- This (output) calculation documents Unit 1 1381.05- Generator (D/G) Auxiliary Power and Unit 2 EDG 125 VDC System load 00-0222 System (EPQ) Voltage Drop & flow / voltage drop and short circuit analyses.
Short Circuit Analysis MCC- U1/2, 125VDC Diesel-Generator This calculation documents the EDG DC 1381.05- (D/G) Auxiliary Power System Auxiliary Power System component design 00-0267 (EPQ) ETAP Model Base File input data (including modeled loads) that is subsequently used for system (output) calculations.
MCC- U1/2 125VDC Vital I&C Power This (output) calculation verifies that the 1381.05- System (EPL) Battery Sizing and existing 125 VDC Vital I & C System batteries 00-0200 Battery Charger Sizing and chargers are adequately sized for the expected load profile.
MCC- Ul/2, 125VDC Vital I&C Power This (output) calculation documents Unit 1 1381.05- System (EPL) Voltage Drop and Unit 2 125 VDC Vital I & C System load 00-0230 Analysis flow / voltage drop analyses.
Page 6 of 8
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OF NUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORT A MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATE Number Title Description MCC- U1/2, 240/120VAC Auxiliary This (output) calculation verifies that Unit 1 1381.06- Control Power System (EPF), and Unit 2 125 VDC Control and 240/120 00-0013 Inverter & Regulator Sizing VAC System batteries, chargers, inverters and regulators are adequately sized.
MCC- U1/2, 125VDC Auxiliary Control This (output) calculation verifies that Unit 1 1381.06- Power System (EPK) Battery and and Unit 2 125 VDC Control System batteries 00-0062 Charger Sizing are adequately sized.
MCC- U1/2, 250VDC Auxiliary Power This (output) calculation verifies that Unit 1 1381.06- System (EPJ) Battery and and Unit 2 250 VDC Power System batteries 00-0025 Charger Sizing and chargers are adequately sized.
MCC- 250/125VDC SSF Auxiliary This (output) calculation verifies that SSF 1381.06- Power Battery and Battery 250/125 VDC Power System batteries and 00-0027 Charger Sizing Calculation chargers are adequately sized.
MCC- 125VDC Switchyard Battery and This (output) calculation verifies that 1381.06- Battery Charger Sizing switchyard 125 VDC Power System batteries 00-0056 Calculation and chargers are adequately sized.
MCC- SSF Diesel Generator 24VDC This (output) calculation verifies that SSF DG 1381.06- Starting Battery Sizing 24 VDC Power System batteries and chargers 00-0061 Calculation are adequately sized.
NRC Question 39 Provide One Line Diagrams of 230 kV and 525 kV switchyards to which MNS Unit 1 and Unit 2 are connected. Provide a discussion of any impact on 230 kV and 525 kV switchyard components due to the increase of 40 MWe power output from each unit of MNS.
McGuire Response to NRC Question 39 Reference Enclosure 3 for copies of the One Line Diagrams of the 230 kV and 525 kV switchyards to which McGuire Nuclear Station (MNS) Unit 1 and Unit 2 are connected.
Page 7 of 8
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OF NUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORT A MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATE The MUR, along with the HP Turbine project and generator replacement project, will collectively result in an increase of approximately 40 MWe from each Unit at MNS. This will return the gross MNS generation capability to the current generator's maximum design output of 1450 MVA. Associated switchyard components were originally designed to accommodate the main power step-up transformer ratings (Unit 1 - 1520 MVA, 230kV; Unit 2 - 1500 MVA, 525kV),
which exceed the replacement generator's design rating of 1450 MVA. Therefore, the 230 kV and 525 kV switchyard components can accommodate the increased 40 MWe power output from each MNS unit.
NRC Question 40 Provide minimum 230 KV and 500 kV switchyard voltages agreed upon between the MNS and the Transmission System Operator (TSO) for N-1 (generator trip) conditions for the pre-MUR and post-MUR operating conditions. Discuss whether these minimum switchyard voltages have been considered to calculate the degraded voltage relay settings (as provided in the MNS Technical Specifications Surveillance Requirement SR 3.3.5.2) at the safety-related buses.
Discuss any impact of the post-MUR uprate conditions on the degraded voltage relay settings.
McGuire Response to NRC Question 40 The minimum pre-MUR Unit 1 230 kV switchyard voltages are 224.77 kV (both offsite circuits available) and 235.25 kV (one offsite circuit out of service). The minimum pre-MUR Unit 2 525 kV switchyard voltages are 503.37 kV (both offsite circuits available) and 525.63 kV (one offsite circuit out of service).
The MNS switchyard voltages are set based upon the degraded voltage relay settings at the safety-related buses (as specified in Technical Specifications Surveillance Requirement SR 3.3.5.2.) and plant loading. The degraded voltage relay settings at the safety related buses will not be changed under post-MUR uprate conditions. Therefore, any changes in switchyard voltages after MUR implementation will be dependent on plant loading. Any change in these post-MUR switchyard voltages will be discussed and communicated with the TSO prior to implementation of the MUR.
Page 8 of 8