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MONTHYEARML21004A2202021-01-0404 January 2021 NRR E-mail Capture - Acceptance Review for Battery Resistance LAR Project stage: Acceptance Review ML21126A3152021-05-0606 May 2021 Proposed License Amendment Request to Battery Surveillance Requirements - Response to Request for Additional Information Project stage: Response to RAI ML21232A2172021-10-19019 October 2021 Issuance of Amendment Nos. 288 and 271 to Revise Technical Specifications Battery Surveillance Testing Project stage: Approval 2021-10-19
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Category:Letter
MONTHYEARML24032A1112024-02-0101 February 2024 Owner'S Activity Report for North Anna, Unit 2, Refueling Outage N2R29 - First Period of the Fifth ISI Interval ML24032A4662024-01-16016 January 2024 Response to Comments on Draft Vpdes Permit No. VA0052451 ML24017A0802024-01-11011 January 2024 Notification of Licensed Operator Initial Examination 05000338/2024301 and 05000339/2024301 ML24003A8372024-01-0909 January 2024 Letter to Elizabeth Toombs, Thpo, Cherokee Nation, Notice of Availability of the Draft Site-Specific EIS for North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8412024-01-0909 January 2024 Notice of Availability of the Draft Site-Specific Environmental Impact Statement for the North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8502024-01-0909 January 2024 Letter to Wenonah Haire, Thpo, Catawba Indian Nation, Notice of Availability of the Draft Site-Specific EIS for North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML23332A7272024-01-0909 January 2024 Notice of Availability of the Draft Site-Specific Environmental Impact Statement for the North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8382024-01-0909 January 2024 Letter to G. Anne Richardson, Chief, Rappahannock Tribe, Inc., Notice of Availability of Draft Site-Specific Environmental Impact Statement for North Anna Power Station Units 1 and 2, Subsequent License Renewal ML24003A8482024-01-0909 January 2024 Notice of Availability of the Draft Site-Specific Environmental Impact Statement for the North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8392024-01-0909 January 2024 Letter to Gerald Stewart, Chief, Chickahominy Indian Tribe, Eastern Division Re Re Notice of Availability of the Draft Site-Specific Environmental Impact Statement for North Anna Power Station Subsequent License Renewal ML24003A8472024-01-0909 January 2024 Letter to Tom Jonathan, Chief, Tuscarora Nation, Notice of Availability of the Draft Site-Specific EIS for North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8492024-01-0909 January 2024 Letter to W. Frank Adams, Chief, Upper Mattaponi Tribe Re Re Notice of Availability of the Draft Site-Specific Environmental Impact Statement for North Anna Power Station Subsequent License Renewal ML24003A8462024-01-0909 January 2024 Notice of Availability of the Draft Site-Specific Environmental Impact Statement for the North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8352024-01-0909 January 2024 Letter to Acee Watt, Thpo, United Keetoowah Band of Cherokee Indians in Oklahoma Re Notice of Availability of the Draft Site-Specific Environmental Impact Statement for North Anna Power Station Subsequent License Renewal ML24003A8422024-01-0909 January 2024 Letter to Paul Barton, Thpo, Eastern Shawnee Tribe of Oklahoma, Notice of Availability of Draft Site-Specific Environmental Impact Statement for North Anna Power Station Units 1 and 2, Subsequent License Renewal ML24003A8432024-01-0909 January 2024 Letter to Robert Gray, Chief, Pamunkey Indian Tribe, Notice of Availability of the Draft Site-Specific EIS for North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8362024-01-0909 January 2024 Notice of Availability of the Draft Site-Specific Environmental Impact Statement for the North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8442024-01-0909 January 2024 Letter to Russell Townsend, Thpo, Eastern Band of Cherokee Indians ML24003A8402024-01-0909 January 2024 Letter to Katelyn Lucas, Thpo, Delaware Nation, Oklahoma, Notice of Availability of Draft Site-Specific Environmental Impact Statement for North Anna Power Station Units 1 and 2, Subsequent License Renewal ML24003A8452024-01-0909 January 2024 Letter to Stephen Adkins, Chief, Chickahominy Indian Tribe, Notice of Availability of Draft Site-Specific Environmental Impact Statement for North Anna Power Station Units 1 and 2, Subsequent License Renewal ML23332A1852024-01-0404 January 2024 Notice of Availability of the Draft Site-Specific Environmental Impact Statement for the North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML23332A0872024-01-0404 January 2024 Notice of Availability of the Draft Site-Specific Environmental Impact Statement for the North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML23360A6352024-01-0404 January 2024 Letter to Dominion Availability for North Anna Units 1 and 2 Draft Site Specific Environmental Impact Statement ML23332A1472023-12-21021 December 2023 Issuance of Environmental Scoping Summary Report Associated with the Staff'S Review of the North Anna Power Station, Units 1 and 2, Subsequent License Renewal Application ML23283A3052023-12-20020 December 2023 Review of Appendix F to DOM-NAF2, Qualification of the Framatome ORFEO-GAIA and ORFEO-NMGRID CHF Correlations in the Dominion Energy VIPRE-D Computer Code (EPID L-2022-LLT-0003) (Nonproprietary) ML23346A0972023-12-11011 December 2023 License Amendment Request to Revise the Emergency Plan Relocation of the Technical Support Center - Response to NRC Request for Additional Information ML23346A1022023-12-11011 December 2023 2024 North Anna Power Station Brq Inspection Notification Letter ML24012A0942023-12-0707 December 2023 GL Report from Dominion Virginia Power Regarding Transfer of Devices ML24012A0892023-12-0707 December 2023 GL Registration from Dominion Virginia Power ML23334A2432023-11-30030 November 2023 Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation ML23362A0602023-11-29029 November 2023 ISFSI, Submittal of Cask Registration for Spent Fuel Storage IR 05000339/20234022023-11-27027 November 2023 Security Baseline Inspection Report 05000338 and 05000339/2023402 IR 05000338/20230032023-11-13013 November 2023 Integrated Inspection Report 05000338/2023003 and 05000339/2023003 ML23311A2042023-10-0909 October 2023 Annual Submittal of Technical Specification Bases Changes Pursuant to Technical Specification 5.5.13.d IR 05000338/20234032023-10-0505 October 2023 Reissue - North Anna Power Station - Cyber Security Inspection Report 05000338/2023403 and 05000339/2023403 (Cover Letter) ML23279A0612023-10-0505 October 2023 Paragon Energy Solutions LLC, Part 21 Final Report Re Potential Defect with Eaton Jd and Hjd Series Molded Case Circuit Breakers (Mccbs) ML23230A0502023-10-0202 October 2023 5 of the Quality Assurance Topical Report - Review of Program Changes ML23275A0992023-09-28028 September 2023 Subsequent License Renewal Application Third 10 CFR 54.21(b) Annual Amendment IR 05000338/20230112023-09-26026 September 2023 Quadrennial Focused Engineering Inspection Commercial Grade Dedication Report 05000338/2023011 and 05000339/2023011 ML23242A3482023-09-11011 September 2023 Cyber Security Inspection Report 05000338/2023403 and 05000339/2023403 - Cover ML23254A0242023-09-0606 September 2023 Paragon Energy Solutions LLC, Potential Defect with Eaton Jd and Hjd Series Molded Case Circuit Breakers (Mccbs) ML23249A2592023-09-0606 September 2023 Core Operating Limits Report Cycle 30, Pattern Ukr, Revision 0 ML23214A2022023-09-0505 September 2023 Staff Assessment of Updated Seismic Hazards Following the NRC Process for the Ongoing Assessment of Natural Hazards Information 2024-02-01
[Table view] Category:Response to Request for Additional Information (RAI)
MONTHYEARML23346A0972023-12-11011 December 2023 License Amendment Request to Revise the Emergency Plan Relocation of the Technical Support Center - Response to NRC Request for Additional Information ML23208A0922023-07-26026 July 2023 Request for Approval of Appendix F of Fleet Report DOM-NAF-2-P Qualification of Framatome ORFEO-GAIA and OORFE-NMGRID CHF Correlations in the Dominion Energy Vipre-D Computer Code Response ML23136A8832023-05-16016 May 2023 Responses to Request for Additional Information and Request for Confirmation of Information Regarding Environmental Review of Subsequent License Renewal Application L-04-002, Stations - NRC Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors Fleet Response to Request for Additional Information2023-05-0808 May 2023 Stations - NRC Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors Fleet Response to Request for Additional Information ML23103A2752023-04-13013 April 2023 Response to Request for Additional Information Regarding Proposed License Amendment Request for Removal of Refueling Water Chemical Addition Tank and Replacement of Containment Sump Buffer ML23096A2982023-04-0606 April 2023 Units 1 and 2 and Millstone Power Station, Units 2 and 3 - Request for Approval of Appendix F of Fleet Report DOM-NAF-2-P Qualification of the Framatome ORFEO-GAIA and ORFEO-NMGRID CHF Correlations in the Dominion ML23089A3542023-03-30030 March 2023 Response to Request for Additional Information Regarding Proposed License Amendment Request to Revise Emergency Plan Staff Augmentation Times ML22312A4432022-11-0707 November 2022 NRC Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors Fleet Response to RAI ML22115A1752022-04-25025 April 2022 ASME Section XI Inservice Inspection Program - Relief Request N2-14-LMT-004 - Fourth Interval Third Period Limited Examinations - Response to Request for Additional Information ML21350A4082021-12-16016 December 2021 Application to Revise Technical Specifications to Adopt TSTF-577, Revised Frequencies for Steam Genera Tor Tube Inspections, Rev 1, Using the Consolidated Line-Item Improvement Process Response to RAI ML21341B4372021-12-0606 December 2021 (Naps), Units 1 and 2 - Subsequent License Renewal Application Responses to NRC Request for Additional Information Safety Review - Set 5 ML21258A3542021-09-15015 September 2021 (Naps), Units 1 and 2 - Subsequent License Renewal Application (SLRA) Response to NRC Request for Confirmation of Information Set 2 Safety Review ML21259A0852021-09-15015 September 2021 North Ann, and Surry, Units 1 and 2, Millstone, Units 2 and 3, Request for Approval of Appendix E of Fleet Report DOM-NAF-2-A Qualification of the Framatome BWU-I CHF Correlation in the Vipre-D Computer Code Response to Request for Addition ML21210A3962021-07-29029 July 2021 (Naps), Units 1 and 2 - Subsequent License Renewal Application (SLRA) Response to NRC Request for Additional Information Safety Review - Set 4 and Supplement 3 ML21147A2932021-05-27027 May 2021 (Naps), Units 1 and 2 Subsequent License Renewal Application (SLRA) Response to NRC Request for Additional Information Safety Review - Set 3 and Administrative Change to SLRA Table A4.0-1, Item 25 ML21133A2852021-05-13013 May 2021 Stations, Units 1 & 2 and Millstone Power Station, Units 2 and 3 - Request for Approval of Appendix E Fleet Report DOM-NAF-2-A Qualification of the Framatome Bwui CHF Correlation in the Dominion Energy VIPRE-D Computer Code ML21126A3152021-05-0606 May 2021 Proposed License Amendment Request to Battery Surveillance Requirements - Response to Request for Additional Information ML21119A2872021-04-29029 April 2021 (Naps), Unit 1 and 2 - Subsequent License Renewal Application (SLRA) Response to NRC Request for Additional Information Safety Review - Set 2 and Flow Accelerated Corrosion Program Enhancement Completion ML21091A1872021-04-0101 April 2021 Response to NRC Request for Additional Information Regarding Safety Review - Set 1 & Clarification to Aging Management of Fire Protection System Lined Ductile Iron Valves ML21084A1822021-03-24024 March 2021 Subsequent License Renewal Application Response to NRC Requests for Confirmation of Information for the Safety Review - Set 1 ML21056A5572021-02-25025 February 2021 NRC Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors Final Supplemental Response ML21053A4332021-02-22022 February 2021 (Naps), Units 1 and 2 - Subssequent License Renewal Application (SLRA) Environmental Review - Response to NRC Request for Additional Information ML21042B9042021-02-11011 February 2021 Subsequent License Renewal Application, Response to NRC Requests for Confirmation of Information for the Environmental Review ML21033A3022021-01-25025 January 2021 (NAPS) Units 1 and 2 - Subsequent License Renewal Application (SLRA) - Provides Requested Documents in Response to Environmental Audit. Part 1 of 2 ML21022A1752020-12-16016 December 2020 Steam Generator Tube Inspection Report RAI Response ML20296A6672020-10-22022 October 2020 ASME Section XI Inservice Inspection Program Proposed Inservice Inspection Relief Request N1-I4-LMT-003 Response to Request for Additional Information ML20296A7272020-10-22022 October 2020 Stations Units 1 & 2 - Proposed License Amendment Requests Addition of Analytical Methodology to the Core Operating Limits Report for a Small Break LOCA Supplement to the Response to Request for Additional Information ML20268B1872020-09-24024 September 2020 ASME Section XI Inservice Inspection Program, Proposed Inservice Inspection Alternative N1-I5-NDE-002, Response to Request for Additional Information ML20156A2872020-06-0404 June 2020 Inservice Testing Program Plan for Pumps, Valves, and Snubbers Fifth 10-Year Interval Update for Units 1 & 2 Request for Alternatives to Requirements of ASME OM Code - Response to RAI ML20149K6942020-05-28028 May 2020 Response to Request for Additional Information, to Proposed License Amendment Requests Addition of Analytical Methodology to the Core Operating Limits Report for a Small Break Loss of Coolant Accident ML20140A3362020-05-18018 May 2020 Revised Reactor Vessel Materials Surveillance Capsule Withdrawal Schedules - Response to Request for Additional Information ML20021A0052020-01-17017 January 2020 Inservice Testing Program Request for Alternative to Requirements of ASME OM Code Relief Request P-9, Response to Request for Additional Information ML19249B7672019-08-29029 August 2019 Enclosure 1 - Millstone, Units 2 and 3 and ISFSI; North Anna, Units 1 and 2 and ISFSI; and Surry, Units 1 and 2 and ISFSI - Response to EAL Scheme Change RAIs ML19248B7622019-08-22022 August 2019 Supplement to Proposed License Amendment Request - Flood Protection Dike Modification - Response to Onsite Audit Questions ML19225D1302019-08-0808 August 2019 Response to Request for Additional Information (Follow-Up) Regarding Open Phase Protection Per NRC Bulletin 2012-01 - Proposed License Amendment Request ML19196A1102019-07-0909 July 2019 Attachments 2, 3 & 4 - Response to NRC Request for Additional Information and Correction of SBLOCA Analysis Error and Revised Marked-Up/Typed NAPS and SPS Technical Specifications Pages ML19156A2072019-05-24024 May 2019 Response to Request for Additional Information on Proposed License Amendment Request Open Phase Protection Per NRC Bulletin 2012-01 ML19071A1142019-03-0707 March 2019 Response to 03/12/2012 Information Request, Seismic Probabilistic Risk Assessment Supplement for Recommendation 2.1 ML18267A0682018-09-18018 September 2018 Attachment - Response to Request for Clarification on Proposed Consolidated Emergency Operations Facility License Amendment Requests ML18257A2272018-09-14014 September 2018 SPRA (Fukushima 50.54f) Audit (Clarification) Questions - Plant Response ML18169A2262018-06-13013 June 2018 Attachment 1 - Response to Request for Additional Information ML18169A2272018-06-13013 June 2018 Attachment 3 - Proposed NAPS Emergency Plan Changes ML18093A4452018-03-28028 March 2018 Ad 2, Response to 03/12/2012 Information Request Seismic Probabilistic Risk Assessment for Recommendation 2.1 ML18092A0812018-03-26026 March 2018 Supplement to Proposed License Amendment Request to Revise Technical Specifications to Adopt TSTF-522, Revise Ventilation System Surveillance Requirements to Operate for 10 Hours Per Month ML18037A7042018-01-31031 January 2018 Response to Request for Additional Information Regarding Proposed License Amendment Request for Spent Fuel Storage and New Fuel Storage ML17354A1602017-12-14014 December 2017 Response to March 12, 2012 Information Request Spent Fuel Pool Seismic Evaluation for Recommendation 2.1 ML17241A0452017-08-24024 August 2017 Proposed ISI Alternatives NI-14-NDE-010 and N2-14-NDE-005 Reactor Pressure Vessel Nozzle Weld Inspections Response to Request for Additional Information ML17171A2302017-06-14014 June 2017 Response to Request for Additional Information ASME Section XI Inservice Inspection Program Request for Proposed Alternative N1-I4-009 and N2-I4-NDE-004 ML17065A2502017-02-28028 February 2017 & Independent Spent Fuel Storage Installation (ISFSI) - Submittal of Response to Request for Referenced Information Related to RAIs 2-2, 3-5, and 3-8 ML17025A1282017-01-20020 January 2017 Independent Spent Fuel Storage Installation - Response to Request for Additional Information for License Renewal Application (CAC L25121) 2023-07-26
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Text
l I
VIRGINIAELECTRIC AND POWER COMPANY l
RICHMOND,VIRGINIA 23261 I
May6,2021 ATTN:Document Control Desk U.S.NuclearRegulatory Commission Serial No.: 21-137 NRA/ENC: RO l
DC20555-0001 Washington, Docket Nos.:50-338 /
50-339 I I
License Nos.:NPF-4 l NPF-7 j I
V l NORTH ANNAPOWER STATION UNITS 1AND 2 I
I I
System dated Byletter (ADAMS)
December Accession 17,2020(Agencywide No.ML20352A394),
Documents Access andManagement Virginia Electric andPower Company l
(DominionEnergy Virginia) requested changes totheTechnical Specifications (TS) for i AnnaPower North Station (NAPS) Units 1and2.Specifically,the proposed amendment I NAPSTS 3.8.4, revises "Electrical PowerSystems, DC Sources -
Operating," l Surveillance Requirements foreachsafety-related (SRs) battery 3.8.4.2 that and3.8.4.5 specifya total byadding connection newacceptance criteria resistance value as l
f established byNorth Annacalculations. j Theinter-cell connection resistance valueof1.5E-4 Ohmcurrently specified inTS 3.8.4 i if isnon-conservative all, ora considerable number, ofthe connections are postulated to E beattheTSlimit value, sincethe acceptable totalbattery connection resistance value l wouldbeexceeded.
connection resistance Thenewacceptance iswithinpre-established criteriawillconfirm andensures limits that that thetotal thebatteries battery will
/
their perform specified safetyfunction bymaintaining required battery terminal voltage under designed load conditions. ,
I Byemaildated March 26,2021, NRCstaff indicated that additional information was I necessary response tocomplete theirreview additional oftherequested information changes. TheNRCrequested byMay7,2021. TheEnterprise a l totheirrequest for (RAl)
Project (EPID)
Identifier referenced forthisrequestisL-2020-LLA-0275.
Dominion Energy Virginia's response totheNRCsRAIiscontained intheEnclosure to this letter. g i
Serial No.: 21-137 Docket Nos.: 50-338/339 Page2 of3 Please contact Erica N.Combsat804-273-3386 if youhave anyquestions regarding this submittal.
Sincerely,
.a -
MarkD.Sartain Vice President -
Nuclear Engineering & Fleet Support COMMONWEALTH OFVIRGINIA )
)
COUNTY OFHENRICO )
Theforegoing document was acknowledged before inand for theCounty rne, andCommonwealth aforesaid, today byMr.Mark D.Sartain,whoisVice President Nuclear Engineering andFleet Support, ofVirginia Electric andPower Company. Hehasaffirmed beforemethat he is duly authorized toexecute andfiletheforegoing document inbehalfofthat company,andthat thestatements inthedocument are truetothe best ofhis knowledge andbelief.
Acknowledged methis before fo dayof , 2021.
MyCommission Expires: 0N PDu a i Commonwealth ofVirginia Reg. # 7518653 MyCommission ExpiresDecember 31,2023 N taryP ic
Enclosure:
' , Response toNRCRequest for AdditionalInformation Commitments madebythis letter:None
References:
1 Letter from Dominion Energy VirginiatoNRC,"North AnnaPower Station Units 1and 2, Proposed License Amendment Request to ChangeBattery Surveillance Requirements," dated December 17,2020. [ADAMS Accession No.ML20352A394)
Serial No.:
21-137 Docket Nos.:
50-338/339 Page3of3 cc: Regional Administrator, Region II U. S.Nuclear Regulatory Commission Marquis OneTower 245Peachtree Center Avenue, NE,Suite 1200 Atlanta,Georgia 30303-1257 Mr.G.E.Miller Senior ProjectManager -
NorthAnnaPowerStation U.S.Nuclear Regulatory Commission Mail Stop 09E-3 OneWhite North Flint 11555 Rockville Pike Rockville, Maryland 20852-2738 Mr.Marcus Harris OldDominion Electric Cooperative Innsbrook Corporate Center 4201Dominion Boulevard, Suite 300 Glen Allen, Virginia 23060 NRCSenior Resident Inspector North AnnaPower Station
Serial No.:
21-137 Docket 50-338/339 Nos.:
ENCLOSURE Virginia andPowerCompany Electric Virginia)
Energy (Dominion AnnaPower North Station Unit 1 andUnit 2
Serial No.:21-137 Docket Nos.:
50-338/339 Enclosure Page1of4 RESPONSE TONRCREQUEST FORADDITIONAL INFORMATION REGARDING PROPOSED LICENSE AMENDMENT REQUEST TO CHANGE BATTERY SURVEILLANCE REQUIREMENTS Byletter dated December 17, 2020(Agencywide Documents Access andManagement System (ADAMS) Accession No. ML ML20352A394), Virginia ElectricandPower Company (Dominion EnergyVirginia) requested changes tothe Technical Specifications (TS) for North AnnaPower Station (NAPS) Units 1and2. Specifically, theproposed amendment revises NAPSTS 3.8.4, "Electrical PowerSystems, DC Sources -
Operating," Surveillance Requirements (SRs) 3.8.4.2 and3.8.4.5 byadding new acceptance criteriaforeachsafety-related battery that specify a total connection resistance value asestablished byNorth Anna calculations.
Theinter-cell connection resistance value of1.5E-4 Ohm specified inTS 3.8.4 isnon-conservative ifall,ora considerable number, oftheconnections arepostulated tobeat theTS limit value, since theacceptable totalbattery connection resistance value would beexceeded. Thenewacceptance criteria willconfirm that the total battery connection '
resistance iswithinpre-established limits andensures that the batteries will perform their specified safety function bymaintaining required battery terminal voltage under designed load conditions.
Ina March 26,2021 e-mail from Mr.EdMiller (NRC Senior Project Manager) toMs.Erica I
Combs(Dominion Energy Virginia Corporate Licensing), theNRC technical staff requested additional information regarding theproposed changes byMay7,2021. The Enterprise ProjectIdentifier (EPID) referenced for this request isL-2020-LLA-0275.
Dominion's response totheNRCrequest for additional information (RAI) isprovided below.
RAl Question No.1 W:
Theregulations at10CFR50.36, "Technicalspecifications," establish therequirements related tothe content oftheTS.Pursuant to10CFR50.36(c), TSarerequired toinclude items infivespecificcategories related tostation operation:
(1)Safety limits,limiting safety system settings, andlimiting control settings, (2)Limiting conditions for operation (LCOs),
Serial No.: 21-137 Docket Nos.: 50-338/339 Enclosure Page2 of4 (3) Surveillance requirements (SRs),
(4)Design features; and (5) Administrative controls.
Theproposed changes inthis LARrelate tothe SRcategory.
10CFRPart 50.36(c)(3), "Surveillance requirements," requires surveillance relating to test,calibration, orinspection toassurethat thenecessary quality ofsystems and components ismaintained,that facility operationwill bewithin safety limits, andthat the conditions limiting for operationwill bemet.
E519115185L.
IntheLAR,Section 3.2, Technical Analysis, the licensee states:
AlorthAnnavoltage profile calculations for the Class 1Ebatteries provide a basis for themaximum allowable total connection resistance values (to include the i nter-cell, inter-jar, and cable termination connectors) that would ensure proper operation of the 125V D C Vital Bus in Design Basis Accident andSBO[station blackout) scenarios. The inter-rack and inter-tier cable resistance is not included within the basis of total connection resistance values. Theperiodic tests measure fromthecell post to thecable termination for thecable termination connectors. Theinter-rack and inter-tiercables areseparately included inthecalculation analysis, and any configuration change that would impact these cables would require an update tothe analysis.
Pleaseprovide asummary ofassumptions, design basis andmargins considered for total circuit resistances including battery internal resistance, battery system connection resistance,external conductor andconductor connection resistances.
Besponse:
CalculationsEE-0857, "NAPSStation Battery 1-Ill Voltage Profile Calculation" andEE-0858,"NAPSStation Battery 1-ll Voltage Profile Calculation," provide thebasis for the Intercell total Connection Resistance (ICR) ofall North Anna125VDCVital BusStation Batteries.Analyses inboth calculations wereperformed using theElectrical Transient Analyzer Program (ETAP) software. TheEnersys/Exide 2GN-23 stationary batteries wereoriginally installed under Design Change DC85-29 andconsist of60cells residing in30jarssecured tofour battery racks.
SerialNo.:21-137 Docket Nos.:50-338/339 Enclosure Page3of4 Calculation EE-0857, Revision 0 provides anallowable maximum ICRof2,502 micro-Ohmsbased ontheresults ofETAPvoltage drop analysis forthe125VDCdistribution system ofthe 1-Ill 125VDCVital Bus. This analysis isconsidered bounding for batteries 1-I,2-I, and2-Ill based onbattery duty cycle loading (amp-hours removed) andcontrol circuit lengths.
Calculation EE-0858, Revision 0,provides anallowable maximum ICRof902micro-Ohms based o n the results of ETAP voltage drop a nalysis forthe125VDCdistribution system ofthe1-ll 125VDC Vital Bus.Addendum G tothis calculation provides an allowable maximum ICRof1,502 micro-Ohms based onthe results ofETAPvoltage drop analysis forthe2-II 125VDCVital Bus. Theanalysis ofthe2-II 125VDCVital Busis considered bounding for batteries 1-IV and 2-IV based onbattery duty cycle loading.
A value of8.5micro-Ohms forinter-jarconnectors and9.5micro-Ohms for inter-cell connectors wasassumed present inthemanufacturer suppliedperformance data based onmanufacturer data anda review ofstation battery resistance readings. Perthe manufacturer, Enersys, six toeight cellsareconnected inseries toderive discharge curves for endcell voltage. Therefore theimpact ofconnection plates isincluded inthe data supplied. Thevalues assumed werebased onanaverage ofmeasured resistances from all station batteries andcompared toaverage resistance readings supplied by Enersys. Thevalues assumed wereconservatively lower than the values supplied by Enersys. Theresistance ofconnector endplates wasincluded as part oftheoverall battery system connection resistance andwasnot included aspart of the assumed inter-cellandinter-jar connection resistance.
Overall analyzed battery system connection plate resistance doesnot include the effects ofinstalled battery connector cables, only connected inter-cell, inter-jar, and end connector plates. Theeffects ofcables areconsidered asa separate elementof the North Anna125VDCbattery ETAPmodel(s). During performance ofperiodic teststhat measure battery resistance, theconnection cables arenot included in field measurements. Forcells attheendofeachrack, measurements aretaken fromthe battery post tothebolted lugconnecting thebattery cable. Thetotal sumofinter-cell, inter-jar, andendconnector plateresistance iscompared toavalue bound bythe analysis performed inCalculations EE-0857 andEE-0858.
Cable temperatures wereassumed tobeoperating ata maximumrating of750Cto conservatively increase theresistance ofall cables. Forcables within theNorth Anna battery rooms, thehighest expected roomtemperature is29.40C, allowing thecables 45.60C oftemperature rise during operation. This wasconsidered conservative when comparing theevaluated 750Campacity ofthe250MCM Aluminum cables that connect
Serial No.: 21-137 Docket Nos.: 50-338/339 Enclosure Page4 of4 thebattery bank totheir respective distribution panel tothehighest continuous current produced in the ETAP model(s).
Battery cables are maintained asscheduled cables with pullticketlengths referenced via Dominion's Plant Data Management System (PDMS) for North Anna.Each125VDC battery iscomposed of 4 racks for all 60cells. Scheduled inter-rackcables connect cell 12tocell 13andcell48 to cell49.An unscheduled inter-tier cableconnects cell 30to cell 31.Cell 31resides on the rack directly below cell 30andisconnected bya setof fourparallel 2/0Copper cables supplied bythemanufacturer, with theexception of Battery 1-III,which hasfour parallel 4/0Aluminum conductors asprovided fromthe manufacturer during theoriginal installation ofthe2GN-23batteries. Thebattery I analyzed inCalculation EE-0857 includes theuseofthe4/0Aluminum cables, which j bounds the useof2/0Copper onall other batteries.
Battery Internal Resistance isa part oftheincluded ETAP battery library for theGNseries [
ofbatteries. Itseffectsarepresent inthewayETAP calculates terminal voltage based j onapplication ofIEEE 485Annex Ctomanufacturer performance data.
Margin for overall battery connection resistance isnotincluded inthe analyses performed inCalculations Calculation EE-0857 EE-0857 andEE-0858.
toallow for increases Instead, a small margin load toDCpowered loads over time isincluded andinclude in j a
theimpacts ofthepotential increases inload onvoltage drop. Calculation EE-0858 creditsa small margin load for the2-II, 1-IV, and2-IV 125VDCVital Bus Distribution Systems butdoesnotinclude anyfor 1-II duetothe voltage analysisresults during 1-ll i Station Battery's duty cycle. Themargin loads aretracked byCorporate Electrical/I&C Analysis inconjunction with theNorth Station Anna Electrical Load Listandany required g calculation updates. I TheETAPbattery model analyzes thetotal connection plate resistanceinseries with the batterycables toinclude their effects onvoltage drop within theNorth Anna125VDC l batterymodel between the modeled battery source andthemain distribution panel. The maximum allowable resistance from the calculations hasbeenused asthebasis for this d License Amendment Request. j I
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