Text

Response to Electronic Request for Additional Information Regarding Modification of Technical Specification (TS) 3.8.4, DC Sources Operating Surveillance Requirements (Srs) 3.8.4.2 and 3.8.4.5 Amendment Request, 08/28/2015
	ML15289A352
Person / Time
Site:	Grand Gulf
Issue date:	10/15/2015
From:	Kevin Mulligan; Entergy Operations
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	GNRO-2015/00064
	Download: ML15289A352 (10)
	v • d • e

Entergy Operations, Inc.P.O.Box756PortGibson,MS39150 Kevin MulliganSiteVicePresidentGrandGulfNuclearStationTel.(601)437-7500 GNRO-2015/00064 October15,2015 u.s.Nuclear Regulatory Commission Attn: DocumentControlDeskWashington,DC20555-0001

SUBJECT:

Grand Gulf Nuclear Station Response to ElectronicRequestforAdditional Information Regarding Modification of Technical Specification(TS)3.8.4,"DCSources"Operating Surveillance Requirements(SRs)3.8.4.2and 3.8.4.5 AmendmentRequest,dated August28,2015.GrandGulf NuclearStation,Unit1DocketNo.50-416LicenseNo.NPF-29

REFERENCES:

1.

ElectronicRequestfor Additional InformationRegardingModificationof Technical Specification(TS)3.8.4,"DCSources"Operating Surveillance Requirements(SRs)3.8.4.2and3.8.4.5,datedAugust28, 2015.2.EntergyLetter,"Grand Gulf NuclearStationResponsetoElectronicRequestfor Additional Information Regarding Modification of Technical Specification(TS)3.8.4,"DCSources"Operating Surveillance Requirements(SRs)3.8.4.2and3.8.4.5 AmendmentRequest," 2015/00002,datedMarch27,2015(ADAMS Accession No.ML 15089A122).

DearSirorMadam:

EntergyOperations,Inc.isprovidinginthe Attachmentaresponsetothe Reference1RequestforAdditional Information (RAI).Thislettercontainsnonew commitments.Ifyouhaveany questionsorrequireadditionalinformation,pleasecontactMr.JamesNadeauat 601-437-2103.Ideclareunderpenaltyofperjurythattheforegoingistrueandcorrect;executedon October 15, 2015.Sincerely, KM/sas 2 GNRO-2015/00064Page2of2Attachments:1.GrandGulfNuclearStationResponseto ElectronicRequestforAdditional Information Regarding ModificationofTechnical Specification(TS)3.8.4,"DCSources"Operating Surveillance Requirements(SRs)3.8.4.2and3.8.4.52.CleanTSpageforthe proposedchangesincludingtheword"battery"

Enclosures:

EC-Q1 L21-90023EC43968 MarkupEC-Q1 L21-90023 EC-Q1 L21-90033EC43968 MarkupEC-Q1 L21-90033 EC-Q1 L21-90046EC43968 Markup EC-Q1 L21-90046NOTE:These Enclosuresarerelativelylarge documents and thereforearenotEnclosedwiththisletterbutareavailableforreviewin CERTREC underaninspectiontitled"BatteryResistanceLARRAIResponses."cc:with Attachments u.S.Nuclear Regulatory CommissionATTN:Mr.Marc L.Dapas Regional Administrator,RegionIV1600EastLamarBoulevardArlington,TX76011-4511 u.S.Nuclear Regulatory CommissionATTN:Mr.A.Wang, NRR/DORLMailStop OWFN/8 G14Washington,DC20555-0001NRCSeniorResident InspectorGrandGulf Nuclear StationPortGibson,MS39150StateHealth Officer Mississippi DepartmentofHealthP.O.Box1700Jackson,MS 39215-1700 Attachment1to GNRO-2015/00064 Grand Gulf Nuclear Station Response to Electronic Request for Additional Information Regarding Modification of Technical Specification(TS)3.8.4,"DC Sources" Operating Surveillance Requirements(SRs)3.8.4.2and3.8.4.5 Attachment to GNRO-2015/00064Page1of4 By letter dated June 26, 2014 (Agencywide Document Access and Management System (ADAMS)AccessionNo.ML14177A270), Entergy OperationsInc.(Entergy,the licensee)submitted a license amendment request(LAR)for Grand Gulf NuclearStation,UnitNo.1 (GGNS)to modify Technical Specification (TS)3.8.4,"DC Sources-Operating Surveillance Requirements (SRs)3.8.4.2 and 3.8.4.5.By letter dated December 9,2014,theUS Nuclear Regulatory Commission (NRC)staff requested additional information regardingtheJune26,2014,submittal.By letter dated March 27, 2015 (ADAMS AccessionNo.ML15089A122),Entergyresponded tothisRAI.TheNRC staff has reviewed these responses and determinedthatthe following additional information is required to complete its review of the amendment request.RAI Question#1: In responsetoRAI1.a,onpage1of Attachment1,the licensee states:"GGNis deviatingfromthe current requirementsinSRs 3.8.4.2 and 3.8.4.5 because terminal resistance is accountedforinthe resistance values for inter-cellconnectionsthereforeitis appropriate to remove terminal connection resistance valuesfromSR 3.8.4.2andSR3.8.4.5.Each batterycellhastwo terminals, a positive and negative terminal."Also,onpage3,the licensee stated that the battery end connection resistance measured from test pointsCandDas shown on Figure2for Division1and2 batteriesisfor inter-rack connections,andassuchtheend terminal connection is includedinthe terminology of inter-rack.Onpage5,the licensee stated that the Division 3 battery's terminal connection resistance is measured inthesame manner as Divisions1and2 batteries.

GGNS currentTSSRs 3.8.4.2 and 3.8.4.5 require verification of resistances for battery inter cell connections, inter-rack connections, inter-tier connections, and terminal connections within specifiedlimits.The staff notes thattheTS requirements for battery terminal connections resistance applytothe battery"output" terminal connections (i.e., connections between the battery's output terminalsandthe cables connectingtothe switchgear)sinceall the other positive and negative terminal connectionsofthe batterycellsarepartofthe cell, inter-rack, and inter-tier connections.

This terminology for battery"terminal connections" resistance is consistentwiththeNRC NUREG-1434,"Standard Technical Specifications

-General Electric Plants (BWRl6),"andthe industry guidance in Institute of Electrical and Electronics Engineers Standard(IEEEStd.)450,"Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications." Basedonthe staff's understandingoftheTS requirements for battery terminal connections resistance, the staff finds the licensee's responsetoRAI1.aisnot acceptable.

Please providetheTS acceptance criteria for Division1,2,and3 battery"output" terminal connections resistances.

Also, please consider adding these TS acceptance criteria to SRs 3.8.4.2 and 3.8.4.5 for consistency with GGNS current TS.ResponsetoRAI Question#1: The intentofthe discussion providedinthe previous submittal(RAI1.a)wasan attempt to simplify the number of different termswiththe samevalue.The proposed Division1,2,and 3 battery output terminal connection resistances TS acceptance criteriahavebeenaddedtothecleanTSpage requested in RAlltem#4for consistencywiththe current GGNS Attachment to GNRO-2015/00064Page2 of4 Technical Specifications.

The battery's output terminal connectioncarriesa100 micro-ohm restrictionforDivisionI,IIandIII.

RAI Question#2:IntheLAR,the licensee proposed the followingrevisedSR3.8.4.2: "Verify Division1and2 battery connection resistanceiss0.5E-4ohmfor inter-cell connectionsands1.0E-4ohmfor inter-rack or inter-tier connections.

AND VerifyDivision3 connection resistance is1.0E-4ohmper inter-cell and inter-tier connection."Basedonthe clarification providedinthe conferencecallandthe guidance provided in Attachment 2,"Surveillance Procedure[SP]06-EL-1L 11-R-0001,125Volt Battery Bank Physical Condition Check,"oftheMarch27,2015letter,the staff understandsthatthe procedurehasan administrative resistancelimitof0.5E-4ohmforeach positive or negative post connection measuredoneachsideofthe interconnectingbars.Sincethe inter-cell connection resistance consistsofthetotal resistance measured between the positivepostof one batterycellandthe negativepostofthe adjacent batterycell,withbothposts connectedbyabar(see Figure1below),it appearsthatthe allowable inter-cell connection resistance for GGNS Division1and2 batteries, accordingtoSP06-EL-1L11-R-0001 provided in Attachment2,is0.5E-4ohm+0.5E-4ohmor1.0E-4ohm.Pleaseexplain:a)Howtheadministrativeresistancelimitforeach positive or negative post connection as measuredinSP06-EL-1L11-R-0001 correspondstothe proposedvaluefor inter-cell connection resistanceintheSR.b)Howthe inter-cell resistancevalueis considered in battery capacity calculationsc)Howthe proposed inter-cell resistance for Division 3 battery is calculatedd)Howthe resistancesofany inter-rack cables is measured and consideredinthe battery capacity calculations.

MICRO-OHM METER ,r+--LEADS-+" I-I 1+1 I-I 1+1 CELL CELL Figure 1 Intercell Resistance measurement Attachment to GNRO-2015/00064ResponsetoRAI Question#2: Page 30f4ReferringtoFigure1above(page2of4):a.Pleasealsorefertopage5ofSP06-EL-1L11-R0001.This surveillance forDivisionIandDivisionII measures resistanceacrosseachbolted connectionbetweenthecellpost(TestPoint"A")andthetwo interconnectingstraps(TestPoint"B")recordingthe highestresistance.Eachcellthathas interconnectingstrapsistestedinthismanner.ForDivisionIandDivisionII,the administrativelimitofeachpositiveand negative connection,withthe exceptionofthebattery end connectionandcell30tocell31 connection,is100 micro-ohms.

Resulting, the maximum allowed"intercell connection resistance"wouldbethesumofthe post-to-strap allowed connection resistances,or200 micro-ohms.b.The resistances are incorporated in calculations EC-Q1L21-90033,90046,andEC-Q1 L21-90023bythebolted connection resistances as describedinthe2.a.responseinthisRAI,notasthe"intercell connectionresistance".Toclarify,thevaluesare incorporatedinthe mannerthatthe surveillance is executedinthatthe resistance is incorporatedbasedonterminalconnections.Howthis resistance is calculated and incorporatedintoeach calculation is discussedinsection3.3ofEC-Q1 L21-90033andEC-Q1L21-90046,andsection3.4inEC-Q1L21-90023.The calculationsareprovidedin responsetoRAI#3.c.Pleasealsorefertopage6ofSP06-EL-1L11-R0001.This surveillance forDivisionIII measures resistanceacrosseachbolted terminal connection betweenthecellpostflag(TestPoint"A")andtheintercellstrap(TestPoint"B")and records the measuredresistance.Eachpositiveand negative terminal connector is measuredinthis mannerwithan administrativelimitof100 micro-ohms.Resulting,the maximumallowed"intercell connection resistance"wouldbethesumofthe measurements,or200 micro-ohms.d.Pleaserefertopage5ofSP06-EL-1L 11-R-0001.Steptworeferstotheprocess of measuring resistancefortheinterrackconnection.Each connection is administrativelyrestrictedto100 micro-ohms,summingto200 micro-ohms fortheinterrack connection.Howthis resistance is calculated and incorporated into each calculation is discussedinsection3.3ofEC-Q1 L21-90033andEC-Q190046.The calculationsareprovidedin responsetoRAI#3.

Attachment to GNRO-2015/00064 RAI Question#3:Page4of4 In responsetoRAI1.a,the licensee stated that adequacy of battery terminal voltage using the resistance values for inter-cell, inter-rack(if applicable), and inter-tier are validated by calculations EC-Q1L21-90033 (Division 1), EC-Q1L21-90046 (Division2),and90023 (Division3)in Engineering Change EC-43968.In Attachment3,the licensee providedacopyof EC-43968 TopicNotes.The EC-43968 Topic Notes does not include the referenced calculations for Divisions1,2,and3.Please provide summariesofthecalculations,including assumptions, performed to determinetheTS acceptance criteria for battery inter-cell, inter-tier, inter-rack, and terminal connections resistances for Divisions1,2,and3,andto validate the adequacy of battery terminal voltagesusingthe resistances values.ResponsetoRAI Question#3: The requested documents are included as Enclosuresasthebase calculation and the mark-uptothe calculation to accountforthe additional proposed resistance values.Those Enclosures are relatively large documents and therefore are available for review in CERTREC under an inspection titled"Battery ResistanceLARRAI Responses.

" RAI Question#4: In responsetoRAI1.b,the licensee statedthattheword"battery"willbeaddedtothe TS statements for clarification.

Please provideacleanTSpageforthe proposed changes includingtheword"battery." ResponsetoRAI Question#4:AcleanTSpageforthe proposed changes, including the additional word"battery" for clarification, is included as Attachment

2.

Attachment2to GNRO-2015/00064CleanTSpageforthe proposed changesincludingtheword"battery" DC Sources-Operating

3.8.4 ACTIONS

(continued)

CONDITION REQUIRED ACTION COMPLETION TIME E.Division 3 DC D.1 Declare High Pressure Immediately electrical power Core Spray System subsystem inoperable inoperable.

for reasons other than Condition A.F.Required ActionandE.1 Be in MODE 3.12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months associated Completion Time of Condition C or AND D not met.E.2 Be in MODE 4.36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months SURVEILLANCE REQUIREMENTS SR 3.8.4.1 SR 3.8.4.2 GRAND GULF SURVEILLANCE Verify battery terminal voltage is129V on float charge.Verify no visible corrosion at battery terminals and connectors.

Verify Division1and2 battery connection resistance is1.0 E-4 ohm for inter-cell connections,2.0 E-4 ohm for inter-rack connections,2.0 E-4 ohm for inter-tier connections, and1.0 E-4 ohm for battery terminal connections.

AND Verify Division 3 battery connection resistance is2.0 E-4 ohm for inter-cell,2.0 E-4 ohm for inter-tier connection, and<1.0 E-4 ohm for terminal connections.

3.8-27 FREQUENCY7days92days (continued)

Amendment No.___

DC Sources-Operating

3.8.4 SURVEILLANCE

REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.8.4.3 SR 3.8.4.4 SR 3.8.4.5 Verify battery cells, cell plates,and24months racksshowno visual indication of physical damage or abnormal deterioration that could degrade battery performance.

Remove visible corrosion and verify battery24months cell to cell and terminal connections are coated with anti-corrosion material.Verify Division1and2 battery connection24months resistance is1.0 E-4 ohm for inter-cell connections,2.0 E-4 ohm for inter-rack connections,2.0 E-4 ohm for inter-tier connections, and1.0 E-4 ohm for terminal connections.

AND Verify Division 3 battery connection resistance is2.0 E-4 ohm for inter-cell,2.0 E-4 ohm for inter-tier connection, and1.0 E-4 ohm for terminal connections.

SR 3.8.4.6 GRAND GULF Verify each Division1and2 required battery charger supplies400 amps at125V for10 hours;and the Division 3 battery charger supplies50 amps at125V for4 hours.3.8-2824months (continued)