ML15141A099: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by StriderTol)
 
(Created page by program invented by StriderTol)
Line 13: Line 13:
| page count = 26
| page count = 26
}}
}}
=Text=
{{#Wiki_filter:1NRR-PMDAPEm ResourceFrom:Miller, EdSent:Wednesday, May 20, 2015 8:16 AMTo:Hardgrove, Matthew; Diamond, David J (diamond@bnl.gov) (diamond@bnl.gov); Jenkins, Joel
==Subject:==
Presentation Slides for Duke Public MeetingAttachments:Duke Final  slides for NRC  RAPTOR presentation  dated 5-19-15 rev 1.pptx; Catawba Unit 1 MUR RAI Whitepaper Slides_prop3_NRC.pptxHere are the slides used at the meeting yesterday.
Ed Hearing Identifier:  NRR_PMDA  Email Number:  2099  Mail Envelope Properties  (9C2386A0C0BC584684916F7A0482B6CA018F6CB564D4) 
==Subject:==
Presentation Slides for Duke Public Meeting  Sent Date:  5/20/2015 8:15:32 AM  Received Date:  5/20/2015 8:15:00 AM  From:    Miller, Ed  Created By:  Ed.Miller@nrc.gov  Recipients:    "Hardgrove, Matthew" <Matthew.Hardgrove@nrc.gov>  Tracking Status: None  "Diamond, David J (diamond@bnl.gov) (diamond@bnl.gov)" <diamond@bnl.gov>  Tracking Status: None  "Jenkins, Joel" <Joel.Jenkins@nrc.gov>  Tracking Status: None Post Office:  HQCLSTR02.nrc.gov  Files    Size      Date & Time  MESSAGE    65      5/20/2015 8:15:00 AM  Duke Final  slides for NRC  RAPTOR presentation  dated 5-19-15 rev 1.pptx    151263 Catawba Unit 1 MUR RAI Whitepaper Slides_prop3_NRC.pptx    572923  Options  Priority:    Standard  Return Notification:    No  Reply Requested:    No  Sensitivity:    Normal  Expiration Date:      Recipients Received:
Justification for the use of RAPTOR-M3G for the Catawba Unit 1Measurement Uncertainty Recapture Power Uprate (MUR)FlEliFluence EvaluationsCecil Fletcher, Catawba Nuclear Station flffManager of  Regulatory Affairs May 19, 2015y Justification for the Use of RAPTOR-M3G for the Catawba Unit 1 Measurement Uncertainty Recapture Power Uprate Fluence Evaluations Purpose of the meetingpg*Duke requested this meeting to present its written response to  RAI SRXB-RAI8.SRXBRAI 8.*The RAPTOR-M3G code used to calculate fluence for MUR conditionsdoesnotappeartobeapprovedbytheNRCforgenericconditions does not appear to be approved by the NRC for generic application. *ThismeetingcoupledwithadditionaltechnicalinformationThis meeting coupled with additional technical information submitted to the NRC provides the justification for the use of RAPTOR-M3G for the Catawba Unit 1 MUR Power Uprate Fluence evaluations. 2 Justification for the Use of RAPTOR-M3G for the Catawba Unit 1 Measurement Uncertainty Recapture Power Uprate FluenceEvaluations ProjectOverviewProject Overview*During the course of the project, design and operational margin evaluations have been completed on all Catawba Unit 1 and Shared Structure, Systems and Components (SSCs).
These evaluations demonstrate that Catawba Unit 1 and Shared SSCs have sufficient  margin to accommodate the MUR gPower Uprate.*Cameron Measurement Systems, CaldonUltrasonics LEFM CheckPlusFlow Measurement system was installed in Catawbaunit1inMay2014.Catawba unit 1 in May 2014.3 Justification for the Use of RAPTOR-M3G for the Catawba Unit 1 Measurement Uncertainty Recapture Power Uprate Fluence Evaluations *LAR Submittal
==Background:==
*Initial submittal made on June 23, 2014 consistent with Regulatory Issue Summary (RIS) 2002-03 format.*SupplementedonAugust262014toconfirmcompletionofcommitmentrelated*Supplemented on August 26, 2014 to confirm completion of commitment related to evaluation of components for acceptability for post-MUR equipment qualification (EQ) conditions.*First request for additional information (RAI) response letter submitted on q()pDecember 15, 2014 (responded to questions from SRXB, SCVB, AFPB, EMCB, and ESGB branches and included WCAP-16083-NP and WCAP-17669-NP).*Second RAI response letter submitted on January 22, 2015 (responded to ifEVIBdEEEBbh)questions from EVIB and EEEB branches).*Third RAI response letter submitted on April 23, 2015 (responded to questions from SRXB, ESGB, and EEEB branches and included WCAP-17993-NP).4 Justification for the Use of RAPTOR-M3G for the Catawba Unit 1 Measurement Uncertainty Recapture Power Uprate Fluence Evaluations *2012 Decision to Use Raptor-BothDORT/SYNTHESISandRAPTOR-M3GhadbeenperformedBoth DORT/SYNTHESIS and RAPTORM3G had been performed. Comparison showed:*The two methods calculated fluence values for the original beltline region that were in good agreement.*Being better able to track and account for high energy neutrons, RAPTOR fluence values in the extended beltline region were more realistic.-RAPTOR was validated within Westinghouse using by past surveillance lditdtRGid1190capsule dosimetry data per Reg. Guide 1.190.-RAPTOR was previously used for South Texas Capsule fluence. NRC stated:"hldfllflhdhhb*"Should future evaluations employ fluence methods that have not been NRC reviewed and approved, adequate justification regarding the application and qualification of those methods should be provided. RG 1.190 provides guidance for acceptable fluence methods."5 Justification for the Use of RAPTOR-M3G for the Catawba Unit 1 Measurement Uncertainty Recapture Power Uprate Fluence Evaluations *Catawba Reactor Vessel Material-During recent license amendment submittals the NRC Staff has requested llRVfititilbilddhddiftthall RV ferritic material be included when addressing fracture toughness requirement for RV integrity. RIS 2014-11 defines these requirements.-As a result of considering all ferritic material for the MUR submittal, the lead material for P-T limits is located in the Catawba Unit 1 extended beltline region.Factors that contributed to the shift in location are:*The original beltline materials have good toughness properties based on actual material data.*Not all material properties are available for the extended beltline material resulting in ppguncertainty which requires additional margin.-The current Catawba Unit 1 P-T limits are for 34 EFPY. Using RAPTOR to calculate fluence including the extended beltline for MUR, the current P-T limitswouldbegoodfor307EFPY(Currently251EFPY)limits would be good for 30.7 EFPY.  (Currently 25.1 EFPY)-With inclusion of margin associated with extended beltline material/nozzles and possibly BTP 5-3, the improved accuracy obtained by using RAPTOR is important in maintaining adequate but reasonable lloperational limits.6 Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.Jianwei ChenCatawba Unit 1 MUR SRXB-RAI 8 ResponsePrincipal Engineer, Ph. DGreg A. FischerPrincipalEngineerPEPrincipal Engineer, P.E.May 19, 20151 Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.BackgroundBackground*The neutron fluenceexposure at reactor pressure vessel (RPV)isanimportantinputtothereactorvesselintegrity(RPV) is an important input to the reactor vessel integrity (RVI) assessment, which is a critical evaluation for power uprate and plant life extension*Traditionally, the neutron fluencehas been evaluated using discrete ordinates radiation transport codes:-TWOTRAN(1968)-Canonlysolve1-Dand2-DproblemsTWOTRAN  (1968) Can only solve 1D and 2D problems-DOT (1970) -Can only solve 1-D and 2-D problems-DORT (1980's) -Can only solve 1-D and 2-D problems-TORT-Cansolve3-Dproblemsbutnotforfull-size-TORT -Can solve 3-D problems, but not for full-size commercial reactor vessels per Regulatory Guide 1.190 pedigree due to computer resource limitations 2 Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.BackgroundBackground*RAPTOR-M3G was developed to overcome TORT's limitationslimitationsFeatureTORTRAPTOR-M3GSolves the linear Boltzmann radiation transport equation in 3DApplies the method of discrete ordinates (theSNmethod) to treat directional variablesApplies weighted finite-difference methodsto treat spatial variablesAliltifltitttddApplies a multigroupformulation to treat energy dependenceDOORS Package(DORT/TORT) input formatExecute on a one-workstation platformExecutessimultaneouslyinparallelonanetworkofworkstationsExecutes simultaneouslyin-parallel on a network of workstationsExecute with theta-weighted(TW) spatial differencing schemeExecute with directional theta-weighted(DTW) spatial differencing scheme3 Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.BackgroundBackground*Westinghouse has performed the neutron fluenceevaluationinsupportoftheCatawbaUnit1MURusingevaluation in support of the Catawba Unit 1 MUR using RAPTOR-M3G in WCAP-17669-NP, Revision 0 *NRC issued SRXB-RAI 8:-The RAPTOR-M3G code used to calculate fluencefor MUR conditions does not appear to be approved by the NRC for use in this scenario. The NRC staff requests that the licensee qprovide justification for the use of RAPTOR-M3G for fluence calculations for MUR conditions, or provide an alternative fluencecalculationusinganNRCapprovedmethod.fluencecalculation using an NRC approved method.4 Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseWestinghouse RAI Response*Westinghouse/Duke are providing justification to the NRC thattheuseofRAPTORM3Gforfluencecalculationsforthat the use of RAPTOR-M3G for fluencecalculations for MUR conditions is acceptable.*Additional Catawba Unit 1 specific benchmark calculations phave been done between TORT and RAPTOR-M3G-For limiting RPV materials-ForrepresentativefuelcyclesFor representative fuel cycles*Due to computer limitations with TORT, three reduced size models were used:URtEit(URE)dl(Wld06)-Upper Reactor Environment (URE) model (Weld 06)-MidplaneReactor Environment (MRE) model (Weld 05)-Lower Reactor Environment (LRE) model (Weld 04)5 Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseStrategyWestinghouse RAI Response StrategyReduced Size Model + TW + TORTDemonstrate TORT and RAPTOR-M3G provide identical results Demonstrate Reduced Size Model has no impact Reduced Size Model + TW + RAPTOR-M3GDemonstrate DTW is conservative for Weld W06Full Core Fine Mesh + TW + RAPTOR-M3G4 sets of results for detailed Full Core Fine Mesh + DTW + RAPTOR-M3G (NRC submittal)6comparison of TORT and RAPTOR-M3G runs Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.Results7 Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationsWestinghouse RAI Response Calculations*RPV Materials Evaluated in Benchmark CalculationsUpperShelltoIntermediateShellCircumferentialWeldW06-Upper Shell to Intermediate Shell Circumferential Weld W06 -Intermediate Shell to Lower Shell Circumferential Weld W05-Lower Shell to Bottom Head Ring Circumferential Weld W04*Power Distributions used in Benchmark Calculations-Cycle 3, representative of Out-In (High Leakage) core design strategies-Cycle 21, representative of Low-Leakage core design strategies-A time-weighted average of power distributions through 54 ggpgEFPY, to provide fluenceprojection at 54 EFPY based on one cycle calculation8 Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationsWestinghouse RAI Response Calculations*URE model -209 radial, 195 azimuthal, and 89 axial mesh intervalsintervalsTORT and RAPTOR-M3G runs are 9using the same geometry model, materials, and source distributions Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationsWestinghouse RAI Response Calculations*MRE model -209 radial, 195 azimuthal, and 85 axial mesh intervalsintervalsTORT and RAPTOR-M3G runs are 10using the same geometry model, materials, and source distributions Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationsWestinghouse RAI Response Calculations*LRE model -209 radial, 195 azimuthal, and 91 axial mesh intervalsintervalsCombining all three reduced size models wouldbeafullcoremodelsimilarto11would be a full core model similar to geometry model used in WCAP-17669-NP, but still not as refined.
Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationsWestinghouse RAI Response Calculations*Boundary Conditions and Extent of Applicability for the ReducedSizeModelsReduced Size ModelsParameterReduced-Size ModelUREMRELREBottom of Model*0.0 cm-191.206 cm-363.296 cmBottom Boundary ConditionReflectiveVoidVoidTopofModel*34346cm190289cm00cmTop of Model343.46 cm190.289 cm0.0 cmTop Boundary ConditionVoidVoidReflective Bottom Extent of Model Applicability*75.0 cm-75.0cm-330.0 cm*DimensionsaregivenrelativetotheactivecoremidplaneTop Extent of Model Applicability*300.0 cm75.0 cm-75.0 cmMaterials Analyzed in ModelWeld W06Weld W05Weld W04UREWeld0612 Dimensions are given relative to the active core midplaneURE -Weld 06MRE -Weld 05LRE -Weld 04 Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationResultsWestinghouse RAI Response Calculation Results*Calculated Neutron FluenceRates for Catawba Unit 1 Cycle3Cycle 3ModelCalculated Neutron (E>1.0 MeV)FluenceRate (Flux) [n/cm2-s]()Weld W06Weld W05Weld W04Reduced-Size Models (TORT) with TW1.06E+092.36E+101.91E+09Reduced-SizeModels(RAPTOR-M3G)withTW106E+09236E+10190E+09Reduced-SizeModels (RAPTOR-M3G) with TW1.06E+092.36E+101.90E+09RAPTOR-M3GModel in WCAP-17669-NP, Rev. 0 with TW1.06E+092.36E+101.90E+09RAPTOR-M3GModelinWCAP-17669-NPRev0114E+09233E+10198E+09RAPTORM3G Model inWCAP17669NP, Rev. 01.14E+092.33E+101.98E+09TORT and RAPTOR-M3G with TW methods give identicalresults(<1%)13identical results (<1%).RAPTOR-M3G with DTW method yields more conservative results for limiting weld W06 Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationResultsWestinghouse RAI Response Calculation Results*Calculated Neutron FluenceRates for Catawba Unit 1 Cycle21Cycle 21ModelCalculated Neutron (E>1.0 MeV)FluenceRate (Flux) [n/cm2-s]()Weld W06Weld W05Weld W04Reduced-Size Models (TORT) with TW6.41E+081.54E+101.20E+09Reduced-SizeModels(RAPTOR-M3G)withTW640E+08154E+10120E+09Reduced-SizeModels (RAPTOR-M3G) with TW6.40E+081.54E+101.20E+09RAPTOR-M3GModel in WCAP-17669-NP, Rev. 0 with TW6.40E+081.54E+101.20E+09RAPTOR-M3GModelinWCAP-17669-NPRev0698E+08154E+10126E+09RAPTORM3G Model inWCAP17669NP, Rev. 06.98E+081.54E+101.26E+09TORT and RAPTOR-M3G with TW methods give identicalresults(<1%)14identical results (<1%).RAPTOR-M3G with DTW method yields more conservative results for limiting weld W06 Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationResultsWestinghouse RAI Response Calculation Results*Calculated Neutron Fluenceafter 54 EFPY at Catawba Unit 1(Reduced-SizeModelscalculatedusingtime-weighted1 (ReducedSize Models calculated using timeweighted average power distributions)ModelCalculated Neutron (E>1.0 MeV)Fluence[n/cm2]Fluence[n/cm2]Weld W06Weld W05Weld W04Reduced-Size Models (TORT) with TW1.05E+182.66E+191.83E+18Reduced-SizeModels (RAPTOR-M3G) with TW1.05E+182.66E+191.83E+18RAPTOR-M3GModel in WCAP-17669-NP, Rev. 0 with TW1.05E+18 (1.07E+18)*2.66E+19 (2.63E+19)*1.83E+18 (1.86E+18)**The projected 54 EFPY fluencevalue in the parenthesis is calculated by accumulating cycle-specific fluencefor cycles 1 through 22, and assuming Cycle 22 at MUR power for cycles beyond Cycle 22, the same approach used in WCAP-17669-NP, Rev. 0RAPTOR-M3G Model inWCAP-17669-NP, Rev. 01.16E+182.60E+191.95E+1815TORT and RAPTOR-M3G with TW methods give identical results (<1%).RAPTOR-M3G with DTW method yields more conservative results for limiting weld W06 Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.Westinghouse RAI Response Calculation ConclusionsConclusions*TORT and RAPTOR-M3G produce nearly identical results, iewithin1%whenusingthesamegeometricalmodeli.e., within 1%, when using the same geometrical model and calculation control parameters*The results from RAPTOR-M3G and TORT agree better thanthe13%uncertaintyassignedtothecalculationalthan the 13% uncertainty assigned to the calculationalmethodology and well within the 20% uncertainty deemed acceptable for RTPTSand RTNDTdeterminationffCf*The fast neutron fluencereported to NRC for the limiting fluenceat 54 EFPY (upper shell to intermediate shell circumferential weld W06) in WCAP-17669-NP, Rev. 0 is the bounding value*Therefore, the fast neutron flux / fluencevalues submitted to NRC in WCAP-17669-NP, Rev. 0 are acceptable16,p Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.Westinghouse RAI Response Calculation ConclusionsConclusions*The in-vessel surveillance capsule and ex-vessel neutron dosimetrydatahavebeenprovidedinWCAP-17669-NP,Rev.0,dosimetrydata have been provided in WCAP17669NP, Rev. 0, Appendix C, the measurement-to-calculation (RAPTOR-M3G) comparisons show:-The in-vessel dosimeters meet the +/-20% criteria for in-vessel illlRlGid1190surveillance capsules per Regulatory Guide 1.190-The ex-vessel dosimeters meet the +/-30% criteria for the cavity capsules per Regulatory Guide 1.190.*Furthersensitivitystudyhasshown:*Further sensitivity study has shown:-Both the RAPTOR-M3G model used in WCAP-17669-NP, Rev. 0 and the reduced size models have achieved geometrical convergence, i.e., using much coarser mesh only changes the g,,gygfluenceresults less than 2%.-Using different quadrature sets (e.g., S12vs. S8) only renders less than 3% difference in the calculated fluencevalues.17 Westinghouse Non-Proprietary Class 3&#xa9; 2015 Westinghouse Electric Company LLC. All Rights Reserved.Thankyou!Thank you !&Questions?18}}

Revision as of 12:01, 11 June 2018

2015/05/20 NRR E-mail Capture - Presentation Slides for Duke Public Meeting
ML15141A099
Person / Time
Site: Catawba  Duke Energy icon.png
Issue date: 05/20/2015
From: Ed Miller
Plant Licensing Branch II
To: Matthew Hardgrove
NRC/NRR/DSS
References
Download: ML15141A099 (26)


Text

1NRR-PMDAPEm ResourceFrom:Miller, EdSent:Wednesday, May 20, 2015 8:16 AMTo:Hardgrove, Matthew; Diamond, David J (diamond@bnl.gov) (diamond@bnl.gov); Jenkins, Joel

Subject:

Presentation Slides for Duke Public MeetingAttachments:Duke Final slides for NRC RAPTOR presentation dated 5-19-15 rev 1.pptx; Catawba Unit 1 MUR RAI Whitepaper Slides_prop3_NRC.pptxHere are the slides used at the meeting yesterday.

Ed Hearing Identifier: NRR_PMDA Email Number: 2099 Mail Envelope Properties (9C2386A0C0BC584684916F7A0482B6CA018F6CB564D4)

Subject:

Presentation Slides for Duke Public Meeting Sent Date: 5/20/2015 8:15:32 AM Received Date: 5/20/2015 8:15:00 AM From: Miller, Ed Created By: Ed.Miller@nrc.gov Recipients: "Hardgrove, Matthew" <Matthew.Hardgrove@nrc.gov> Tracking Status: None "Diamond, David J (diamond@bnl.gov) (diamond@bnl.gov)" <diamond@bnl.gov> Tracking Status: None "Jenkins, Joel" <Joel.Jenkins@nrc.gov> Tracking Status: None Post Office: HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 65 5/20/2015 8:15:00 AM Duke Final slides for NRC RAPTOR presentation dated 5-19-15 rev 1.pptx 151263 Catawba Unit 1 MUR RAI Whitepaper Slides_prop3_NRC.pptx 572923 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: Recipients Received:

Justification for the use of RAPTOR-M3G for the Catawba Unit 1Measurement Uncertainty Recapture Power Uprate (MUR)FlEliFluence EvaluationsCecil Fletcher, Catawba Nuclear Station flffManager of Regulatory Affairs May 19, 2015y Justification for the Use of RAPTOR-M3G for the Catawba Unit 1 Measurement Uncertainty Recapture Power Uprate Fluence Evaluations Purpose of the meetingpg*Duke requested this meeting to present its written response to RAI SRXB-RAI8.SRXBRAI 8.*The RAPTOR-M3G code used to calculate fluence for MUR conditionsdoesnotappeartobeapprovedbytheNRCforgenericconditions does not appear to be approved by the NRC for generic application. *ThismeetingcoupledwithadditionaltechnicalinformationThis meeting coupled with additional technical information submitted to the NRC provides the justification for the use of RAPTOR-M3G for the Catawba Unit 1 MUR Power Uprate Fluence evaluations. 2 Justification for the Use of RAPTOR-M3G for the Catawba Unit 1 Measurement Uncertainty Recapture Power Uprate FluenceEvaluations ProjectOverviewProject Overview*During the course of the project, design and operational margin evaluations have been completed on all Catawba Unit 1 and Shared Structure, Systems and Components (SSCs).

These evaluations demonstrate that Catawba Unit 1 and Shared SSCs have sufficient margin to accommodate the MUR gPower Uprate.*Cameron Measurement Systems, CaldonUltrasonics LEFM CheckPlusFlow Measurement system was installed in Catawbaunit1inMay2014.Catawba unit 1 in May 2014.3 Justification for the Use of RAPTOR-M3G for the Catawba Unit 1 Measurement Uncertainty Recapture Power Uprate Fluence Evaluations *LAR Submittal

Background:

  • Initial submittal made on June 23, 2014 consistent with Regulatory Issue Summary (RIS) 2002-03 format.*SupplementedonAugust262014toconfirmcompletionofcommitmentrelated*Supplemented on August 26, 2014 to confirm completion of commitment related to evaluation of components for acceptability for post-MUR equipment qualification (EQ) conditions.*First request for additional information (RAI) response letter submitted on q()pDecember 15, 2014 (responded to questions from SRXB, SCVB, AFPB, EMCB, and ESGB branches and included WCAP-16083-NP and WCAP-17669-NP).*Second RAI response letter submitted on January 22, 2015 (responded to ifEVIBdEEEBbh)questions from EVIB and EEEB branches).*Third RAI response letter submitted on April 23, 2015 (responded to questions from SRXB, ESGB, and EEEB branches and included WCAP-17993-NP).4 Justification for the Use of RAPTOR-M3G for the Catawba Unit 1 Measurement Uncertainty Recapture Power Uprate Fluence Evaluations *2012 Decision to Use Raptor-BothDORT/SYNTHESISandRAPTOR-M3GhadbeenperformedBoth DORT/SYNTHESIS and RAPTORM3G had been performed. Comparison showed:*The two methods calculated fluence values for the original beltline region that were in good agreement.*Being better able to track and account for high energy neutrons, RAPTOR fluence values in the extended beltline region were more realistic.-RAPTOR was validated within Westinghouse using by past surveillance lditdtRGid1190capsule dosimetry data per Reg. Guide 1.190.-RAPTOR was previously used for South Texas Capsule fluence. NRC stated:"hldfllflhdhhb*"Should future evaluations employ fluence methods that have not been NRC reviewed and approved, adequate justification regarding the application and qualification of those methods should be provided. RG 1.190 provides guidance for acceptable fluence methods."5 Justification for the Use of RAPTOR-M3G for the Catawba Unit 1 Measurement Uncertainty Recapture Power Uprate Fluence Evaluations *Catawba Reactor Vessel Material-During recent license amendment submittals the NRC Staff has requested llRVfititilbilddhddiftthall RV ferritic material be included when addressing fracture toughness requirement for RV integrity. RIS 2014-11 defines these requirements.-As a result of considering all ferritic material for the MUR submittal, the lead material for P-T limits is located in the Catawba Unit 1 extended beltline region.Factors that contributed to the shift in location are:*The original beltline materials have good toughness properties based on actual material data.*Not all material properties are available for the extended beltline material resulting in ppguncertainty which requires additional margin.-The current Catawba Unit 1 P-T limits are for 34 EFPY. Using RAPTOR to calculate fluence including the extended beltline for MUR, the current P-T limitswouldbegoodfor307EFPY(Currently251EFPY)limits would be good for 30.7 EFPY. (Currently 25.1 EFPY)-With inclusion of margin associated with extended beltline material/nozzles and possibly BTP 5-3, the improved accuracy obtained by using RAPTOR is important in maintaining adequate but reasonable lloperational limits.6 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.Jianwei ChenCatawba Unit 1 MUR SRXB-RAI 8 ResponsePrincipal Engineer, Ph. DGreg A. FischerPrincipalEngineerPEPrincipal Engineer, P.E.May 19, 20151 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.BackgroundBackground*The neutron fluenceexposure at reactor pressure vessel (RPV)isanimportantinputtothereactorvesselintegrity(RPV) is an important input to the reactor vessel integrity (RVI) assessment, which is a critical evaluation for power uprate and plant life extension*Traditionally, the neutron fluencehas been evaluated using discrete ordinates radiation transport codes:-TWOTRAN(1968)-Canonlysolve1-Dand2-DproblemsTWOTRAN (1968) Can only solve 1D and 2D problems-DOT (1970) -Can only solve 1-D and 2-D problems-DORT (1980's) -Can only solve 1-D and 2-D problems-TORT-Cansolve3-Dproblemsbutnotforfull-size-TORT -Can solve 3-D problems, but not for full-size commercial reactor vessels per Regulatory Guide 1.190 pedigree due to computer resource limitations 2 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.BackgroundBackground*RAPTOR-M3G was developed to overcome TORT's limitationslimitationsFeatureTORTRAPTOR-M3GSolves the linear Boltzmann radiation transport equation in 3DApplies the method of discrete ordinates (theSNmethod) to treat directional variablesApplies weighted finite-difference methodsto treat spatial variablesAliltifltitttddApplies a multigroupformulation to treat energy dependenceDOORS Package(DORT/TORT) input formatExecute on a one-workstation platformExecutessimultaneouslyinparallelonanetworkofworkstationsExecutes simultaneouslyin-parallel on a network of workstationsExecute with theta-weighted(TW) spatial differencing schemeExecute with directional theta-weighted(DTW) spatial differencing scheme3 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.BackgroundBackground*Westinghouse has performed the neutron fluenceevaluationinsupportoftheCatawbaUnit1MURusingevaluation in support of the Catawba Unit 1 MUR using RAPTOR-M3G in WCAP-17669-NP, Revision 0 *NRC issued SRXB-RAI 8:-The RAPTOR-M3G code used to calculate fluencefor MUR conditions does not appear to be approved by the NRC for use in this scenario. The NRC staff requests that the licensee qprovide justification for the use of RAPTOR-M3G for fluence calculations for MUR conditions, or provide an alternative fluencecalculationusinganNRCapprovedmethod.fluencecalculation using an NRC approved method.4 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseWestinghouse RAI Response*Westinghouse/Duke are providing justification to the NRC thattheuseofRAPTORM3Gforfluencecalculationsforthat the use of RAPTOR-M3G for fluencecalculations for MUR conditions is acceptable.*Additional Catawba Unit 1 specific benchmark calculations phave been done between TORT and RAPTOR-M3G-For limiting RPV materials-ForrepresentativefuelcyclesFor representative fuel cycles*Due to computer limitations with TORT, three reduced size models were used:URtEit(URE)dl(Wld06)-Upper Reactor Environment (URE) model (Weld 06)-MidplaneReactor Environment (MRE) model (Weld 05)-Lower Reactor Environment (LRE) model (Weld 04)5 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseStrategyWestinghouse RAI Response StrategyReduced Size Model + TW + TORTDemonstrate TORT and RAPTOR-M3G provide identical results Demonstrate Reduced Size Model has no impact Reduced Size Model + TW + RAPTOR-M3GDemonstrate DTW is conservative for Weld W06Full Core Fine Mesh + TW + RAPTOR-M3G4 sets of results for detailed Full Core Fine Mesh + DTW + RAPTOR-M3G (NRC submittal)6comparison of TORT and RAPTOR-M3G runs Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.Results7 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationsWestinghouse RAI Response Calculations*RPV Materials Evaluated in Benchmark CalculationsUpperShelltoIntermediateShellCircumferentialWeldW06-Upper Shell to Intermediate Shell Circumferential Weld W06 -Intermediate Shell to Lower Shell Circumferential Weld W05-Lower Shell to Bottom Head Ring Circumferential Weld W04*Power Distributions used in Benchmark Calculations-Cycle 3, representative of Out-In (High Leakage) core design strategies-Cycle 21, representative of Low-Leakage core design strategies-A time-weighted average of power distributions through 54 ggpgEFPY, to provide fluenceprojection at 54 EFPY based on one cycle calculation8 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationsWestinghouse RAI Response Calculations*URE model -209 radial, 195 azimuthal, and 89 axial mesh intervalsintervalsTORT and RAPTOR-M3G runs are 9using the same geometry model, materials, and source distributions Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationsWestinghouse RAI Response Calculations*MRE model -209 radial, 195 azimuthal, and 85 axial mesh intervalsintervalsTORT and RAPTOR-M3G runs are 10using the same geometry model, materials, and source distributions Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationsWestinghouse RAI Response Calculations*LRE model -209 radial, 195 azimuthal, and 91 axial mesh intervalsintervalsCombining all three reduced size models wouldbeafullcoremodelsimilarto11would be a full core model similar to geometry model used in WCAP-17669-NP, but still not as refined.

Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationsWestinghouse RAI Response Calculations*Boundary Conditions and Extent of Applicability for the ReducedSizeModelsReduced Size ModelsParameterReduced-Size ModelUREMRELREBottom of Model*0.0 cm-191.206 cm-363.296 cmBottom Boundary ConditionReflectiveVoidVoidTopofModel*34346cm190289cm00cmTop of Model343.46 cm190.289 cm0.0 cmTop Boundary ConditionVoidVoidReflective Bottom Extent of Model Applicability*75.0 cm-75.0cm-330.0 cm*DimensionsaregivenrelativetotheactivecoremidplaneTop Extent of Model Applicability*300.0 cm75.0 cm-75.0 cmMaterials Analyzed in ModelWeld W06Weld W05Weld W04UREWeld0612 Dimensions are given relative to the active core midplaneURE -Weld 06MRE -Weld 05LRE -Weld 04 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationResultsWestinghouse RAI Response Calculation Results*Calculated Neutron FluenceRates for Catawba Unit 1 Cycle3Cycle 3ModelCalculated Neutron (E>1.0 MeV)FluenceRate (Flux) [n/cm2-s]()Weld W06Weld W05Weld W04Reduced-Size Models (TORT) with TW1.06E+092.36E+101.91E+09Reduced-SizeModels(RAPTOR-M3G)withTW106E+09236E+10190E+09Reduced-SizeModels (RAPTOR-M3G) with TW1.06E+092.36E+101.90E+09RAPTOR-M3GModel in WCAP-17669-NP, Rev. 0 with TW1.06E+092.36E+101.90E+09RAPTOR-M3GModelinWCAP-17669-NPRev0114E+09233E+10198E+09RAPTORM3G Model inWCAP17669NP, Rev. 01.14E+092.33E+101.98E+09TORT and RAPTOR-M3G with TW methods give identicalresults(<1%)13identical results (<1%).RAPTOR-M3G with DTW method yields more conservative results for limiting weld W06 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationResultsWestinghouse RAI Response Calculation Results*Calculated Neutron FluenceRates for Catawba Unit 1 Cycle21Cycle 21ModelCalculated Neutron (E>1.0 MeV)FluenceRate (Flux) [n/cm2-s]()Weld W06Weld W05Weld W04Reduced-Size Models (TORT) with TW6.41E+081.54E+101.20E+09Reduced-SizeModels(RAPTOR-M3G)withTW640E+08154E+10120E+09Reduced-SizeModels (RAPTOR-M3G) with TW6.40E+081.54E+101.20E+09RAPTOR-M3GModel in WCAP-17669-NP, Rev. 0 with TW6.40E+081.54E+101.20E+09RAPTOR-M3GModelinWCAP-17669-NPRev0698E+08154E+10126E+09RAPTORM3G Model inWCAP17669NP, Rev. 06.98E+081.54E+101.26E+09TORT and RAPTOR-M3G with TW methods give identicalresults(<1%)14identical results (<1%).RAPTOR-M3G with DTW method yields more conservative results for limiting weld W06 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationResultsWestinghouse RAI Response Calculation Results*Calculated Neutron Fluenceafter 54 EFPY at Catawba Unit 1(Reduced-SizeModelscalculatedusingtime-weighted1 (ReducedSize Models calculated using timeweighted average power distributions)ModelCalculated Neutron (E>1.0 MeV)Fluence[n/cm2]Fluence[n/cm2]Weld W06Weld W05Weld W04Reduced-Size Models (TORT) with TW1.05E+182.66E+191.83E+18Reduced-SizeModels (RAPTOR-M3G) with TW1.05E+182.66E+191.83E+18RAPTOR-M3GModel in WCAP-17669-NP, Rev. 0 with TW1.05E+18 (1.07E+18)*2.66E+19 (2.63E+19)*1.83E+18 (1.86E+18)**The projected 54 EFPY fluencevalue in the parenthesis is calculated by accumulating cycle-specific fluencefor cycles 1 through 22, and assuming Cycle 22 at MUR power for cycles beyond Cycle 22, the same approach used in WCAP-17669-NP, Rev. 0RAPTOR-M3G Model inWCAP-17669-NP, Rev. 01.16E+182.60E+191.95E+1815TORT and RAPTOR-M3G with TW methods give identical results (<1%).RAPTOR-M3G with DTW method yields more conservative results for limiting weld W06 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.Westinghouse RAI Response Calculation ConclusionsConclusions*TORT and RAPTOR-M3G produce nearly identical results, iewithin1%whenusingthesamegeometricalmodeli.e., within 1%, when using the same geometrical model and calculation control parameters*The results from RAPTOR-M3G and TORT agree better thanthe13%uncertaintyassignedtothecalculationalthan the 13% uncertainty assigned to the calculationalmethodology and well within the 20% uncertainty deemed acceptable for RTPTSand RTNDTdeterminationffCf*The fast neutron fluencereported to NRC for the limiting fluenceat 54 EFPY (upper shell to intermediate shell circumferential weld W06) in WCAP-17669-NP, Rev. 0 is the bounding value*Therefore, the fast neutron flux / fluencevalues submitted to NRC in WCAP-17669-NP, Rev. 0 are acceptable16,p Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.Westinghouse RAI Response Calculation ConclusionsConclusions*The in-vessel surveillance capsule and ex-vessel neutron dosimetrydatahavebeenprovidedinWCAP-17669-NP,Rev.0,dosimetrydata have been provided in WCAP17669NP, Rev. 0, Appendix C, the measurement-to-calculation (RAPTOR-M3G) comparisons show:-The in-vessel dosimeters meet the +/-20% criteria for in-vessel illlRlGid1190surveillance capsules per Regulatory Guide 1.190-The ex-vessel dosimeters meet the +/-30% criteria for the cavity capsules per Regulatory Guide 1.190.*Furthersensitivitystudyhasshown:*Further sensitivity study has shown:-Both the RAPTOR-M3G model used in WCAP-17669-NP, Rev. 0 and the reduced size models have achieved geometrical convergence, i.e., using much coarser mesh only changes the g,,gygfluenceresults less than 2%.-Using different quadrature sets (e.g., S12vs. S8) only renders less than 3% difference in the calculated fluencevalues.17 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.Thankyou!Thank you !&Questions?18