ML12209A175

McGuire, Units 1 & 2 - Response to Request for Additional Information Regarding License Amendment Related to Measurement Uncertainty Recapture Power Uprate

ML12209A175
Person / Time
Site:	Mcguire, McGuire
Issue date:	07/16/2012
From:	Repko R T Duke Energy Carolinas
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
TAC ME8213, TAC ME8214
Download: ML12209A175 (11)

Text

Duke REGIS T. REPKOEn~uery VicePrsdnI wrEnrgy. McGuire Nuclear StationDuke EnergyMG01 VP / 12700 Hagers Ferry Rd.Huntersville, NC 28078980-875-4111980-875-4809 faxregis. repko@duke-energy. cornJuly 16, 2012 10 CFR 50.90U. S& Nuclear Regulatory CommissionWashington, D.C. 20555ATTENTION: Document Control Desk

Subject:

Duke Energy Carolinas, LLC (Duke Energy)McGuire Nuclear Station, Units 1 and 2Docket Nos. 50-369 and 50-370Response to Request for Additional Information Regarding LicenseAmendment Related to Measurement Uncertainty Recapture PowerUprate (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 50.90in support of a measurement uncertainty recapture (MUR) power uprate.NRC MUR LAR RAI questions 32 through 40 and Duke Energy's response are provided inEnclosures 1, 2, and 3. Responses to MNS MUR LAR RAI questions 1 through 3 and questions5 through 19 were provided to the NRC via correspondence dated May 29, 2012 andJune 21, 2012 respectively. Responses to MNS MUR LAR RAI question 4 and questions 20through 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 and3 be withheld from public disclosure per 10 CFR 2.390(d)(1). Upon removal of Enclosures 2and 3, this letter is uncontrolled.The conclusions reached in the original determination that this LAR contains No SignificantHazards Considerations and the basis for the categorical exclusion from performing anEnvironmental/Impact Statement have not changed as a result of the RAI responses provided inthis submittal.Please contact Kenneth L. Ashe at 980-875-4535 if additional questions arise regarding thisLAR.Ao- owww. duke-energy, corn July 16, 2012Nuclear Regulatory CommissionPage 2Sincerely,R. T. RepkoEnclosurescc: w/enclosuresV. M. McCreeRegional Administrator, Region IIU.S. Nuclear Regulatory CommissionMarquis One Tower245 Peachtree Center Ave., NE, Suite 1200Atlanta, GA 30303-1257J. H. Thompson (addressee only)Project Manager (MNS)U.S. Nuclear Regulatory Commission11555 Rockville PikeMail Stop 0-8 G9ARockville, MD, 20852-2738J. ZeilerNRC Senior Resident InspectorMcGuire Nuclear StationW. L. Cox III, Section ChiefNorth Carolina Department of Environment and Natural ResourcesDivision of Environmental HealthRadiation Protection Section1645 Mail Service CenterRaleigh, NC 27699-1645 July 16, 2012Nuclear Regulatory CommissionPage 3OATH AND AFFIRMATIONRegis T. Repko affirms that he is the person who subscribed his name to the foregoingstatement, and that all the matters and facts set forth herein are true and correct to the best ofhis knowledge.Regis T. Repko, Vice-President, McGuire Nuclear StationSubscribed and sworn to me:-rY, ', -OZ2-DateAtryPublicMy commission expires:_I Z'0i1Date RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OFNUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORTA MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATEEnclosure 1McGuire Nuclear Station'sResponses to MUR LAR RAI Questions 32 through 40 In TheJune 15, 2012 NRC Request for Additional InformationNRC Question 32Provide 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 essentialauxiliary system, and 600 volt (V) normal and essential systems) due to the MeasurementUncertainty Recapture (MUR) power uprate and High Pressure (HP) turbine replacement.McGuire Response to NRC Question 32As discussed in Section V.1 of the LAR, the McGuire AC electrical systems were reviewed andfound to have adequate capacity at MUR uprate conditions and are bounded by existinganalyses and calculations. The following are the expected AC electrical load increases due tothe MUR uprate and HP turbine replacement project as determined during evaluations ofMcGuire systems:System Rated Pre-MUR Post-MUR PercentLoad Voltage Horsepower Brake Brake ChangeHorsepower HorsepowerCondensate Pumps 6.9kV 1500 1289 1304 1.2Condensate Booster 6.9kV 3000 2305 2329 1.1PumpsFeedwater Heater C Drain 6.9kV 1250 1133 1134 0.1PumpsFeedwater Heater G Drain 600V 250 190.6 191.0 0.2PumpsSince (a) the expected load changes are quite small, (b) post-MUR pump Brake Horsepowersare well below the rated motor nameplate HPs and (c) margins well beyond thePage 1 of 8 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OFNUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORTA MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATEexpected load increases are available in the current AC electrical power analyses, the loadchanges were deemed bound by the existing analyses.NRC Question 33Provide a list and brief discussion of the electrical analysis and calculations which the licenseereviewed or updated to determine that the AC distribution system(s) remain bounded by theexisting analysis and calculations of record.McGuire Response to NRC Question 33The electrical calculations of record that were reviewed to determine the impact of MUR on ACdistribution system(s) are listed in the following table. This review determined that the ACdistribution system(s) remain bounded by the existing analysis and calculations of record.Number Title DescriptionMCC- Station Blackout Coping Study This calculation documents the ability of1381.05- installed equipment to cope with a Station00-0199 Blackout (SBO) within the guidelines ofNUMARC 87-00, Revision 1.MCC- U1/2 AC Auxiliary Power This calculation documents the AC Auxiliary1381.05- System ETAP Model Base File Power System component design input data00-0257 (including modeled loads) that is subsequentlyused for AC system ETAP (output) calculations.MCC- Unit 1, 6.9kv, 4.16kv, and 600 This (output) calculation documents ETAP load1381.05- volt Auxiliary Power System flow / voltage drop analyses of the Unit 1 AC00-0258 Safety Related Voltage Auxiliary Power Systems.AnalysisMCC- Unit 2, 6.9kv, 4.16kv, and 600 This (output) calculation documents ETAP load1381.05- volt Auxiliary Power System flow / voltage drop analyses of the Unit 2 AC00-0263 Safety Related Voltage Auxiliary Power Systems.AnalysisPage 2 of 8 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OFNUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORTA MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATENumber Title DescriptionMCC- U1, 4.16kV Essential Auxiliary This calculation documents the dynamic loading1381.05- Power System (EPC) Diesel- (and voltage drop) of the Unit 1 Emergency00-0260 Generator Dynamic Loading Diesel Generators (EDGs) and associatedAnalysis, Using ETAP Essential Power Systems.MCC- U2, 4.16 KV Essential Auxiliary This calculation documents the dynamic loading1381.05- Power System (EPC) Diesel (and voltage drop) of the Unit 2 EDGs and00-0266 Generator Dynamic Loading associated Essential Power Systems.Analysis, Using ETAPMCC- U2 6.9kV, 4.16kV & 600V This (output) calculation documents ETAP short1381.05- Auxiliary Power Systems Short circuit analyses of the Unit 2 AC Auxiliary00-0265 Circuit Analysis Power Systems.MCC- Ul 6.9kV, 4.16kV & 600V This (output) calculation documents ETAP short1381.05- Auxiliary Power Systems Short circuit analyses of the Unit 1 AC Auxiliary00-0301 Circuit Analysis Power Systems.MCC- U 1/2, 24kV Unit Main Power This calculation documents the 3-phase fault1381.06- System (EPA) Generator Circuit currents through the Unit 1 and Unit 2 24kV00-0007 Breaker Short Circuit Analysis generator circuit breakers, step-up transformersand associated components.MCC- Design Calculations for This calculation documents the 3-phase fault1381.06- Determining Short Circuit currents at various Isolated Phase Bus (IPB)00-0008 Capabilities of Isolated Phase locations.BusesMCC- Protective Relay Setting This calculation determines the settings for1381.06- Calculation for Units 1 & 2 devices protecting Main Power System00-0019 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 maximum1381.06- (D/G) Loading Analysis steady-state load expected for the Safe00-0054 Shutdown Facility (SSF) D/G.Page 3 of 8 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OFNUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORTA MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATENumber Title DescriptionMCC- Main Generator Voltage This calculation documents the basis for the1381.06- Regulator Limiters and Unit 1 and Unit 2 main generator voltage00-0067 Protection Setting Calculation regulator limiter and protection settings.MCC- Unit 1 Main Generator Relay This calculation documents the settings for the1381.06- Settings for the SEL-300G and Unit 1 main generator microprocessor-based00-0073 Beckwith 3425 Relays protective relays.MCC- Unit 2 Main Generator Relay This calculation documents the settings for the1381.06- Settings for the SEL-300G and Unit 2 main generator microprocessor-based00-0076 Beckwith 3425 Relays protective relays.NRC Question 34Provide a discussion regarding any impact on generator protective relaying due to the increasein the main generator rating.McGuire ResDonse to NRC Question 34The MUR alone has no impact on generator protective relaying. However, the main generatorstator replacement project will have an impact on the settings of the generator protective relayssince the current settings are based upon the current generator rating of 1330 MVA (Unit 1) and1380 MVA (Unit 2) versus the increased rating of 1450 MVA for both Units following generatorstator replacement. The new settings for the generator protective relaying have beendetermined and incorporated into approved calculations.NRC Question 35Provide a discussion of power source(s) for the new Cameron CheckPlus leading edge flowmeter.McGuire Response to NRC Question 35The power for the Leading Edge Flow Meter (LEFM) equipment will be supplied by batterybacked, non-vital, 120VAC sources 1 KDCS1 for Unit 1 and 2KDCS1 for Unit 2. Primary powerfor the MODBUS servers will be supplied by battery backed, non-vital, 120VAC sources 1 KU forUnit 1 and 2KU for Unit 2. Backup power to the Unit 1 and Unit 2 MODBUS equipment will bePage 4 of 8 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OFNUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORTA MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATEsupplied by 1 KDCS1 for Unit 1 and 2KDCS1 for Unit 2. These power sources have sufficientmargin to accommodate the power load associated with the new Cameron CheckPlus leadingedge flow meter.NRC Question 36Provide a copy of the current One Line Diagrams of 250 V Direct Current (DC) Auxiliary PowerSystem, 125 V DC and 240/120 V AC Auxiliary Control Power System, and safety-related 125 VDC and 120 V Vital Instrument and Control Power System.McGuire Response to NRC Question 36Reference Enclosure 2 for copies of the current One Line Diagrams of the site 250 VDCAuxiliary Power System, 125 VDC and 240/120 VAC Auxiliary Control Power System, andsafety-related 125 VDC and 120 V Vital Instrument and Control Power System.NRC Question 37Provide details of any load increases on the 250 V DC Auxiliary Power System, 125 V DC andPower System, and safety-related 125 V DC and 120 V Vital Instrument and Control PowerSystem due to the MUR power uprate and HP turbine replacement.McGuire Response to NRC Question 37Existing margin in plant electrical systems can accommodate the power load associated withthe new Cameron CheckPlus LEFM (refer to the response to RAI Question 35). No other loadchanges 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 theMUR uprate and HP turbine replacement project.Page 5 of 8 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OFNUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORTA MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATENRC Question 38Provide a list and brief discussion of the electrical analysis and calculations which the licenseereviewed or updated to determine that the DC distribution system(s) [including 240/120 V ACAuxiliary Control and 120 V Vital Instrument and Control Power Systems] remain bounded bythe existing analysis and calculations of record.McGuire Response to NRC Question 38The electrical calculations of record that were reviewed to determine the impact of MUR on DCdistribution system(s) [including 240/120 V AC Auxiliary Control and 120 V Vital Instrument andControl Power Systems] are listed in the following table. This review determined that thesesystems remain bounded by the existing analysis and calculations of record.Number Title DescriptionMCC- U1/2, Essential Diesel Generator This (output) calculation verifies that the1381.05- (D/G) 125VDC Auxiliary Power existing EDG 125 VDC batteries and chargers00-0195 System (EPQ) Battery and are adequately sized for the expected loadCharger Sizing profile.MCC- U1/2, 125VDC Essential Diesel- This (output) calculation documents Unit 11381.05- Generator (D/G) Auxiliary Power and Unit 2 EDG 125 VDC System load00-0222 System (EPQ) Voltage Drop & flow / voltage drop and short circuit analyses.Short Circuit AnalysisMCC- U1/2, 125VDC Diesel-Generator This calculation documents the EDG DC1381.05- (D/G) Auxiliary Power System Auxiliary Power System component design00-0267 (EPQ) ETAP Model Base File input data (including modeled loads) that issubsequently used for system (output)calculations.MCC- U1/2 125VDC Vital I&C Power This (output) calculation verifies that the1381.05- System (EPL) Battery Sizing and existing 125 VDC Vital I & C System batteries00-0200 Battery Charger Sizing and chargers are adequately sized for theexpected load profile.MCC- Ul/2, 125VDC Vital I&C Power This (output) calculation documents Unit 11381.05- System (EPL) Voltage Drop and Unit 2 125 VDC Vital I & C System load00-0230 Analysis flow / voltage drop analyses.Page 6 of 8 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OFNUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORTA MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATENumber Title DescriptionMCC- U1/2, 240/120VAC Auxiliary This (output) calculation verifies that Unit 11381.06- Control Power System (EPF), and Unit 2 125 VDC Control and 240/12000-0013 Inverter & Regulator Sizing VAC System batteries, chargers, invertersand regulators are adequately sized.MCC- U 1/2, 125VDC Auxiliary Control This (output) calculation verifies that Unit 11381.06- Power System (EPK) Battery and and Unit 2 125 VDC Control System batteries00-0062 Charger Sizing are adequately sized.MCC- U1/2, 250VDC Auxiliary Power This (output) calculation verifies that Unit 11381.06- System (EPJ) Battery and and Unit 2 250 VDC Power System batteries00-0025 Charger Sizing and chargers are adequately sized.MCC- 250/125VDC SSF Auxiliary This (output) calculation verifies that SSF1381.06- Power Battery and Battery 250/125 VDC Power System batteries and00-0027 Charger Sizing Calculation chargers are adequately sized.MCC- 125VDC Switchyard Battery and This (output) calculation verifies that1381.06- Battery Charger Sizing switchyard 125 VDC Power System batteries00-0056 Calculation and chargers are adequately sized.MCC- SSF Diesel Generator 24VDC This (output) calculation verifies that SSF DG1381.06- Starting Battery Sizing 24 VDC Power System batteries and chargers00-0061 Calculation are adequately sized.NRC Question 39Provide One Line Diagrams of 230 kV and 525 kV switchyards to which MNS Unit 1 and Unit 2are connected. Provide a discussion of any impact on 230 kV and 525 kV switchyardcomponents due to the increase of 40 MWe power output from each unit of MNS.McGuire Response to NRC Question 39Reference Enclosure 3 for copies of the One Line Diagrams of the 230 kV and 525 kVswitchyards 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 OFNUCLEAR REGULATION REGARDING A MCGUIRE LICENSE AMENDMENT TO SUPPORTA MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATEThe MUR, along with the HP Turbine project and generator replacement project, will collectivelyresult in an increase of approximately 40 MWe from each Unit at MNS. This will return thegross MNS generation capability to the current generator's maximum design output of 1450MVA. Associated switchyard components were originally designed to accommodate the mainpower 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 kVand 525 kV switchyard components can accommodate the increased 40 MWe power outputfrom each MNS unit.NRC Question 40Provide minimum 230 KV and 500 kV switchyard voltages agreed upon between the MNS andthe Transmission System Operator (TSO) for N-1 (generator trip) conditions for the pre-MURand post-MUR operating conditions. Discuss whether these minimum switchyard voltages havebeen considered to calculate the degraded voltage relay settings (as provided in the MNSTechnical 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 40The minimum pre-MUR Unit 1 230 kV switchyard voltages are 224.77 kV (both offsite circuitsavailable) and 235.25 kV (one offsite circuit out of service). The minimum pre-MUR Unit 2525 kV switchyard voltages are 503.37 kV (both offsite circuits available) and 525.63 kV (oneoffsite circuit out of service).The MNS switchyard voltages are set based upon the degraded voltage relay settings at thesafety-related buses (as specified in Technical Specifications Surveillance Requirement SR3.3.5.2.) and plant loading. The degraded voltage relay settings at the safety related buses willnot be changed under post-MUR uprate conditions. Therefore, any changes in switchyardvoltages after MUR implementation will be dependent on plant loading. Any change in thesepost-MUR switchyard voltages will be discussed and communicated with the TSO prior toimplementation of the MUR.Page 8 of 8