ML21259A085
| ML21259A085 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Surry, North Anna  |
| Issue date: | 09/15/2021 |
| From: | Mark D. Sartain Dominion Energy Nuclear Connecticut, Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML21259A079 | List: |
| References | |
| 21-042B | |
| Download: ML21259A085 (18) | |
Text
PROPRIETARY INFORMATION
- WITHHOLD UNDER10CFR2.390 VIRGINIAELECTRICAND POWERCOMPANY RICHMOND,VIRGINIA23261 September 15,2021 U.S.Nuclear Regulatory Commission Serial No.
21-042B ATTN:Document Control Desk NRA/GDM RO Washington, D.C.20555 Docket Nos. 50-336/423 50-338/339 50-280/281 License Nos.DPR-65/NPF-49 NPF-4/7 DPR-32/37 NORTHANNAANDSURRYPOWERSTATIONSUNITS 1AND2 MILLSTONEPOWERSTATIONUNITS2AND3 REQUEST FORAPPROVALOFAPPENDIXEOFFLEETREPORT DOM-NAF-2-A QUALIFICATION OFTHEFRAMATOME BWU-ICHFCORRELATION INTHE DOMINIONENERGYVIPRE-D COMPUTER CODE
RESPONSE
TOREQUEST FORADDITIONAL INFORMATION By letter datedFebruary 11,2021[Serial No.21-042(ADAMS Accession No.
ML21042B321)),
Dominion Energy Virginia andDENC(collectively, Dominion Energy) submitted Appendix E,"Qualification oftheFramatome BWU-ICHFCorrelation in the Dominion Energy VIPRE-D Computer Code,"
toFleet Report DOM-NAF-2-A forNRCreview andapproval.
Byletter dated August 13,2021,theNRCrequested additional information tofacilitate their review.
Dominion Energy's response totheNRCrequest isprovided in Attachment 1
Attachment 1contains information proprietary toFramatome Inc.
andissupported byan affidavit (Attachment 3)signed byFramatome, theowneroftheinformation.
Theaffidavit setsforth thebasis onwhich theinformation maybewithheld frompublic disclosure bythe Commission andaddresses withspecificity theconsiderations listed inparagraph (b)(4) of Section 2.390 oftheCommission's regulations.
Accordingly, itisrespectfully requested theproprietary information bewithheld frompublic disclosure inaccordance with 10CFR2.390.
A redacted, non-proprietary response totheNRCrequest foradditional information isprovided inAttachment 2.
Attachment 1contains information that isbeing withheld frompublic disclosure under 10CFR2.390.
Uponseparation fromAttachment 1,thispageisdecontrolled.
Serial No.21-042B Docket Nos.50-336/423/338/339/280/281/395 RAlResponse DOM-NAF-2, Appendix E
Page2of3 lfyouhave questions orrequire additional information, please contact Mr.GaryD.Miller at (804) 273-2771 Respectfully, p
~-
MarkD.Sartain VicePresident
- Nuclear Engineering and Fleet Support Commitments madeinthis letter:
None
Attachment:
Response
toNRCRequest for Additional Information 1 Response toNRCRequest forAdditional Information, Appendix E toFleet Report DOM-NAF-2, "Qualification oftheFramatome BWU-ICHFCorrelation intheDominion Energy VIPRE-D Computer Code."
[PROPRIETARY) 2.Response toNRCRequest forAdditional Information, AppendixE to Fleet Report DOM-NAF-2, "Qualification oftheFramatome BWU-ICHFCorrelationin the Dominion Energy VIPRE-D Computer Code."
[Non-Proprietary) 3.Framatome Affidavit forWithholding Proprietary Information fromPublic Disclosure
Serial No.21-0428 Docket Nos.50-336/423/338/339/280/281/39 RAlResponse DOM-NAF-2, Appendix E
Page3of3 cc:U.S. Nuclear Regulatory Commission
- Region I
2100Renaissance
- Blvd, Suite 100 KingofPrussia, Pennsylvania 19406-2713 U.S.NuclearRegulatory Commission
- Region II Marquis OneTower 245Peachtree Center
- Avenue, NESuite 1200
- Atlanta, Georgia 30303-1257 R.V.Guzman NRCSenior Project Manager Millstone PowerStation U.S.Nuclear Regulatory Commission OneWhiteFlint
- North, MailStop08-C2 11555Rockville Pike Rockville, Maryland 20852-2738 Mr.G.EdwardMiller NRCSenior Project Manager
- North AnnaPower Station U.S.Nuclear Regulatory Commission OneWhiteFlint
- North, MailStop09E-3 11555Rockville Pike Rockville, Maryland 20852-2738 Mr.J.J.Klos NRCProject Manager
- Surry PowerStation U.S.Nuclear Regulatory Commission OneWhiteFlint
- North, MailStop09E-3 11555Rockville Pike Rockville, MD20852-2738 NRCSenior Resident Inspector Millstone PowerStation NRCSenior Resident inspector North AnnaPowerStation NRCSenior Resident Inspector Surry PowerStation
Serial No.21-042B Docket Nos.50-336/423/338/339/280/281
[NonProprietary)
ATTACHMENT 2 M
Dominion Energy Nuclear Connecticut, Inc.(DENC)
Millstone PowerStation Units 2and3 Virginia Electric andPowerCompany(Dominion EnergyVirginia)
NorthAnnaandSurry PowerStations Units1and2
Serial No.21-042B Docket Nos.50-336/423/338/339/280/281 Attachment 2
Page1of12
RESPONSE
TONRCREQUESTFORADDITIONAL INFORMATION:
FRAMATOME BWU-I CHFCORRELATION INTHEDOMINIONENERGY VIPRE-D COMPUTERCODE" h
Byletter datedFebruary 11,2021 (Agencywide Documents AccessandManagement System(ADAMS)
Accession No.
assupplemented byletter dated May13,2021(ADAMS AccessionNo ML21133A285),
Dominion Energy requested approval ofAppendix E offleet report DOM-NAF-2, "QualificationoftheFramatome BWU-ICHF[Critical HeatFlux)
Correlation in the Dominion Energy VIPRE-DComputer Code."
Byletter dated August 13,2021,theNRC staff requested additional information tocomplete their review.
TheNRCrequest andDominion Energy's responses areprovided below.
NRCRAl1 Please confirm that Dominion will useaprocess togenerate thepredicted CHF[Critical HeatFlux) value that isconsistent with theprocess usedwhendetermining thepredicted CHFvalue ofthevalidation data.
h:
Yes,Dominion Energy usesaprocess toqualify CHFcorrelations whichis consistent with theapproach usedbythevendorduring thedevelopment ofthecorrelation as documented inSection 4.9and4.10ofReference 7.
NRCRAl-2:
Please identify whichfuel types havebeenvalidated using theBWU-1CHFmodel.
For application topreviously unanalyzed fuel
- types, suchasAFAfuel, please demonstrate that thenumberofdatapoints usedforvalidation ofthat fuel type issufficient forensuring theaccuracy oftheDNBR[Departure fromNucleate Boiling Ratio) limit.
Specifically,
((
M 11
Serial No.21-042B Docket Nos.50-336/423/338/339/280/281 Attachment 2
Page2of12 M:
Theresponse to this RAIisaddressed byseparating therequested information into three sections:
1 Please identify which fuel types havebeenvalidated using theBWU-ICHFmodel.
Dominion Energy is not aware ofanyfuel designs thathavebeenlicensed for reactor operations with the BWU-ICHFcorrelation;
- however, theBWUCritical HeatFluxCorrelations Topical Report(Reference 1,Section 4.2) contains information on thefuel assemblies forwhichtheBWU-ICHFcorrelation is applicable:
"Inthis
- report, then,theInconel mixingvanedesign correlation (BWU-I) isestablished asthe basic correlation forfuel assemblies with mixing vanegrids.
Theenhanced mixing vanecorrelation (BWU-z) ispresently only valid forthe Mark-BW17 design. Fuelassemblies with anyother typeofmixing vanespacer grid wouldrequire analysis withBWU-Iunless anenhancement could be demonstrated from CHFdataforthat specific design."
Notethat theterm"Inconel" isdescribed byFramatometo bea "convenient term foruseindescribing theoriginal mixing vaneconcept not the material itself" (Reference 1,Section 4.2).
2.Forapplication topreviously unanalyzed fuel
- types, suchasAFA fuel, please demonstrate that thenumberofdatapoints usedforvalidation ofthat fuel type is sufficient forensuring theaccuracy oftheDNBR[Departure from Nucleate Boiling RatioJ limit.
Historically, thetesting anddevelopment ofolder CHFcorrelations hasconsisted ofawidearray ofgrid
- types, operating conditions, axial powerdistributions, array
- sizes, andgrid spacings.
Morerecently, CHFcorrelations tendtobedeveloped for specific fuel orgrid designs whichproduce moreaccurate DNBRs,leading tolower DNBRlimits forthecorrelations whichprovide moremargin inDNBanalyses.
Forexample, theWestinghouse WRB-2CHFcorrelation wasdeveloped using tests withvarious heated
- lengths, axial powerprofiles, bothunit andguide tube
- cells, aswell asdifferent mixing vanegrid designs (Reference 5,Section A.2.3).
- Assuch, theWRB-2CHFcorrelation database contains awidevariety oftest data for17x17nuclear fuel products.
Serial No.21-042B Docket Nos.50-336/423/338/339/280/281 Attachment 2
Page3of12 Elaborating onthis
- example, theWRB-2MCHFcorrelation waslater introduced for fuel assemblies withtheModified LowPressure Drop(LPD) mixing vanegrid andModified Intermediate FlowMixer(IFM) grid(Reference 6,Section1).
Westinghouse conducted additional CHFtests withtheModified LPDandIFM grids.
TheWRB-2M CHFcorrelationisa modification totheWRB-2CHF correlation developed tooptimize theCHFpredictions toprovide moreaccurate DNBpredictions, as it was determined during testing thatWRB-2significantly underpredicted theCHF performance (Reference 6,Section 3.1).
Thetests conducted forthe development oftheWRB-2MCHFcorrelation aredocumented inReference 6,Section 2.
Assuch,theWRB-2MCHFcorrelation isamorefine-tuned correlation thanWRB-2andisspecifically intended for more accurate DNBanalysis offuel assemblies with theModified LPDandIFMgrid designs.
Westinghouse determined aminimum DNBR (95/95) limit of1.17fortheWRB-2 CHFcorrelation (Reference 5,Section A.2.3.4)and alimitof1.14fortheWRB-2M CHFcorrelation (Reference 6,Section 3.4).
The reduction inthelimit clearly demonstrates thattheWRB-2MCHFcorrelation, which wascorrelatedand optimized especially forthose fuels withModified LPD and IFMgrids, offers an improved predictive capability ofthethermal performancecompared totheWRB-2CHFcorrelation.
Reference 6,Section 1also states that the WRB-2 correlation DNBRlimit of1.17maybeconservatively applied tofuels with the Modified LPD andIFMgrids;
- however, itwasdesired todevelop a correlation which willmore accurately predict DNBforfuels withModified LPDandIFMgrids.
Similarly, Framatome hasestablished theBWU-ICHFcorrelation asthe basic correlation forfuel assemblies withmixing vanegrids (Reference 1,Section4.2).
Thethermal-hydraulic tests uponwhich theBWU-ICHFcorrelation constants were developed (herein referred toastheBWU-IExperimental Database),
consider a
widevariety oftestgeometries suchasroddiameters, pinpitches, axial flux
- shapes, heated
- lengths, andmixing vanegridspacings.
Assuch,theBWU-I correlation isageneric correlation andtherefore applicable tothedifferent types offuelassemblies thatarerepresented bytheconstituent testsections and approved bytheNRC(Reference 2).
Framatome hasdetermined aDNBRlimit of1.21fortheBWU-ICHFcorrelation usingLYNX2(Reference 1,Section 4.1).
Dominion Energy's benchmark to LYNX2/BWU-I (Reference 3,Section E.5.1) using VIPRE-D/BWU-I (Experimental Database) results inaDNBRlimit of1.23.
Serial No.21-042B Docket Nos.50-336/423/338/339/280/281 Attachment 2
Page4of12 Recall thatWestinghouse stated thattheWRB-2DNBRlimit (1.17) maybe conservatively appliedtothose fuel assemblies withModified LPDandIFMgrids.
Oncethe WRB-2M correlation wasoptimized forthese grid
- designs, theapplicable DNBRlimitdecreased (1.14),
thereby allowing moremargin forDNBanalyses.
It isexpected
- that, should aCHFcorrelation bedeveloped solely upontheAFA-type mixing vaneandmid-span mixing grid datacollected attheColumbia University HeatTransfer Research Facility (HTRF)1(referred toastheCUTests) theresulting 95/95DNBRlimit would be lowerthanthatdetermined forVIPRE-D/BWU-I Combined Database inReference 3 (1.23).
Inother words,applying theDNBR limit derived usingthegeneric VIPRE-D/BWU-I CombinedDatabaseis conservative.
TheBWU-ICHFcorrelation wasnotdeveloped using theCUTests.
Asmentioned previously, theBWU-ICHFcorrelation is a generic correlationintended forfuel assemblies with mixing vanegrids.
Therefore, astatistical analysis ofthetwodata sets(the BWU-ICHFcorrelation Experimental Database andtheCUTests) is performed todetermine ifthedataaresimilar enough tocombineand conservatively apply one-sided tolerance theory for the determination ofa95/95 DNBRlimit.
Section E.5.2 ofReference 3documents this statistical analysis ofthe VIPRE-D/BWU-I Experimental Database andtheCUTests, which demonstrates that thetwodatagroups areofsimilar populations andtherefore may becombined forfurther analysis.
Thistotal database isreferred toasthe VIPRE-D/BWU-I Combined Database.
TheDNBRlimits forboththeVIPRE-D/BWU-I Experimental andCombined Databases weredetermined tobe1.23.
Additionally, the CHF results ofthetwodatabases areindistinguishable inFigures E.5.2-1 through E.5.2-4 ofReference 3,demonstrating thattheBWU-ICHFcorrelation accurately predicts CHFforassemblies whichemploy AFA-type mixing vaneandmid-span mixing grids.
Insummary, thehistorical experience ofgeneric versus optimized correlations, the generic applicability oftheBWU-ICHFcorrelation toa widevariety offuel assembly configurations, theextensive history oftheColumbia HTRFwiththe development ofNRC-approved CHF correlations, andtheresults ofthe aforementioned statistical andvisual analysis provide confidence that theDNBR limits fortheVIPRE-D/BWU-I code/correlation pair documented inReference 3
provide adequate protection ata 95/95confidence level.
Therefore, thelimit of 1TheColumbia HTRFhasanextensive history withthetesting anddevelopment ofvarious NRC-approved CHFcorrelations, suchastheFramatome BWU-zandtheWestinghouse WRB-2MCHFcorrelations.
Serial No.21-042B Docket Nos.50-336/423/338/339/280/281 Attachment 2
Page5of12 1.23 as documented inReference 3 isconservative forapplication tofuel assemblies withAFA-typemixing vaneandmid-span mixing grids.
3.Specifically,((
M 11 M
TABLEREDACTED Figures RAI2-1through 2-4
Serial No.21-042B Docket Nos.50-336/423/338/339/280/281 Attachment 2
Page6of12 Figure RAl2-1 M
FIGURE REDACTED Figure RAI2-2:
M FIGURE REDACTED
Serial No.21-042B Docket Nos.50-336/423/338/339/280/281 Attachment 2
Page7of12 Figure RAl2-3:
M FIGURE REDACTED Figure RAl2-4:
M FIGURE REDACTED
Serial No.21-042B Docket Nos.50-336/423/338/339/280/281 Attachment 2
Page8of12 As noted intheRAl, MassVelocity Dominion Energy thermal-hydraulic analyses using theVIPRE-Dcodearenot conducted at Thermal-hydraulic analyses performed inVIPRE-D are conducted atconservative initial flowconditions.
Forexample, theminimum measured flowrateusedin VIPRE-DforSurry PowerStation forcurrent andintended future operation is 273,000gpm,whichtranslates toapproximately 2.37MIbm/hr-ft2.
Similarly, for NorthAnnaPowerStation, theminimum measured flowrateis 295,000
- gpm, whichtranslates toapproximately 2.51MIbm/hr-ft2.
ForMillstone Unit 3,the minimum measured flowrateis379,200 gpm,whichtranslates toapproximately 2.55Mlbm/hr-ft2 Assuch,theflowrates usedinVIPRE-D analyses shall M
AsDominion Energy thermal-hydraulic analyses donotutilize M
theBWU-ICHFcorrelation M
Ibeanody.namic.Quality
Serial No.21-042B Docket Nos.50-336/423/338/339/280/281 Attachment 2
Page9of12 M
FromFigures RAI 2-3and2-4,itappears that by veryconservativepoints inthetests considered.
Theseconservative points have M
Points with (Figure RAI2-3) areM andappear tobe
- Assuch, Similarly, points withM M
(Figure RAl2-4) are andappear tobe Thesepoints M
Figures RAl2-5and2-6areidenticalto Figures RAl2-3and2-4,respectively,
Serial No.21-042B Docket Nos.50-336/423/338/339/280/28 Attachment 2
Page10of12 Figure RAI25:
FIGURE REDACTED Figure RAI26:
FIGURE REDACTED
Serial No.21-042B Docket Nos.50-336/423/338/339/280/281 ATTACHMENT 3 FramatomeAffidavit:
Dominion Energy Nuclear Connecticut, Inc.(DENC)
Milistone PowerStation Units 2and3 Virginia Electric andPowerCompany(Dominion Energy Virginia)
NorthAnnaandSurryPowerStations Units 1and2
Serial No.21-042B Docket Nos.50-336/423/338/339/280/28 Attachment 3
Page1of3 A FFIDAV IT 1.
Myname isGayleElliott.
IamDeputy
- Director, Licensing andRegulatory
2.
Iamfamiliar with the criteria applied byFramatome todetermine whether certain Framatome information isproprietary.
Iamfamiliar withthepolicies established by Framatome toensure theproper application of these criteria.
3.
Iamfamiliar with the Framatome information contained inAttachment 1,
"Response toNRCRequest forAdditional Information:
Appendix EtoFleet Report DOM-NAF-2-A,
'Qualification oftheFramatome BWU-ICHFCorrelation intheDominion Energy VIPRE-D Computer Code',"
ofaLetter fromMr.MarkSartain(Virginia ElectricandPower Company) toDocumentControl Desk(NRC),
Serial No.21-042B, Docket Nos. 50-336/423, 50-338/339, 50-280/281, datedSeptember 13,2021andreferred herein as "Document."
Information contained inthis Document hasbeenclassified byFramatome asproprietary in accordance with thepolicies established byFramatome forthecontrol andprotectionof proprietary andconfidential information.
4.
ThisDocument contains information ofaproprietary andconfidential nature andisofthetypecustomarily held inconfidence byFramatome andnotmadeavailable tothe public.
Basedonmyexperience, Iamaware that other companies regard information ofthe kind contained inthis Document asproprietary andconfidential.
5.
ThisDocument hasbeenmadeavailable totheU.S.Nuclear Regulatory Commission inconfidence with therequest that theinformation contained inthis Document be withheld frompublic disclosure.
Therequest forwithholding ofproprietary information ismadein accordance with10CFR2.390.Theinformation forwhich withholding fromdisclosure is
Serial No.21-042B Docket Nos.50-33614231338/339/280/28 Attachment 3
Page2of3 requested qualifies under 10CFR2.390(a)(4)
"Trade secrets andcommercial orfinancial information."
6.
The following criteria arecustomarily applied byFramatome todetermine whether informationshould beclassifiedasproprietary:
(a)Theinformation revealsdetails ofFramatome's research anddevelopment plans andprograms ortheir results.
(b) Useofthe information byacompetitor wouldpermit thecompetitor to significantly reduce itsexpenditures, intimeorresources,
- todesign, produce, ormarket asimilar productor service.
(c)Theinformation includes test data or analytical techniquesconcerning a
- process, methodology, orcomponent,the application ofwhichresults ina competitive advantage forFramatome.
(d) Theinformation reveals certain distinguishing aspects ofaprocess, methodology, orcomponent, theexclusive useofwhich provides a
competitive advantage forFramatome inproduct optimization or marketability.
(e)Theinformation isvital toacompetitive advantage held byFramatome, would behelpful tocompetitors toFramatome, andwouldlikely cause substantial harmtothecompetitive position ofFramatome.
Theinformation inthis Document isconsidered proprietary forthereasons setforth in paragraphs 6(d) and6(e) above.
7.
Inaccordance withFramatome's policies governing theprotection andcontrol ofinformation, proprietary information contained inthis Document hasbeenmadeavailable, on alimited
- basis, toothers outside Framatome only asrequired andunder suitable agreement providing fornondisclosure andlimited useoftheinformation.
8.
Framatome policy requires that proprietary information bekeptinasecured file orareaanddistributed onaneed-to-know basis.
Serial No.21-042B Docket Nos.50-336/423/338/339/280/28 Attachment 3
Page3of3 9.
Theforegoing statements aretrueandcorrect tothebestofmyknowledge, information, and belief.
Ideclare under penalty ofperjury that theforegoing istrueandcorrect.
Executed on:September 13,2021 Digitally signed byELUOTT ELLIOTTGayle cavieDate:
2021.09.1311:29:11
-04'00' Gayle Elliott