ML15141A099
ML15141A099 | |
Person / Time | |
---|---|
Site: | Catawba ![]() |
Issue date: | 05/20/2015 |
From: | Ed Miller Plant Licensing Branch II |
To: | Matthew Hardgrove NRC/NRR/DSS |
References | |
Download: ML15141A099 (26) | |
Text
1 NRR-PMDAPEm Resource From: Miller, Ed Sent: Wednesday, May 20, 2015 8:16 AM To: Hardgrove, Matthew; Diamond, David J (dia mond@bnl.gov) (diamond@
bnl.gov); Jenkins, Joel
Subject:
Presentation Slides for Duke Public Meeting Attachments:
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)FlEli Fl uence E va luat i onsCecil Fletcher, Catawba Nuclear Station flffManager o f Regu latory A ffairs Ma y 19, 2015 y Justification for the Use of RAPTOR-M3G for the Catawba Unit 1 Measurement Uncertainty Recapture Power Uprate Fluence Evaluations Pur pose of the meetin g pg*Duke requested this meeting to present its written response to RAI SRXB-RAI8.SRXB RAI 8.*The RAPTOR-M3G code used to calculate fluence for MUR conditionsdoesnotappeartobeapprovedbytheNRCforgenericconditions does not appear to be approved by the NRC for generic application.
- Thismeetingcoupledwithadditionaltechnicalinformation This 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 mar gin 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 re quest for additional information (RAI) res ponse 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)quest i ons from EVIB an d EEEB branc h es).*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
-B othDORT/SYNTHESISandRAPTOR
-M3Ghadbeenperformed B oth DORT/SYNTHESIS and RAPTOR M3G 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 lditdtRGid1190capsu l e d os i me t ry d a t a per R eg. G u id e 1.190.-RAPTOR was previously used for South Texas Capsule fluence. NRC stated:"hldfllflhdhhb
- "S h ou ld future eva luations emp l oy fl uence met h o d s t hat 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 llRVfititilbilddhddiftth a ll RV f err iti c ma t er i a l b e i nc l u d e d w h en a ddress i ng frac ture t oug h ness 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 p ro perties are available for the extended beltline material resultin g in pp guncertainty 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 lloperationa l l imits.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. D Greg A. FischerPrincipalEngineerPE Principal Engineer , P.E.May 19, 2015 1
Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.
Background
Background
- 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-Dproblems TWOTRAN (1968) Can only solve 1 D and 2 D 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.
Background
Background
- RAPTOR-M3G was developed to overcome TORT's limitations limitations FeatureTORTRAPTOR-M3GSolves the linear Boltzmann radiation transport equation in 3DApplies the method of discrete ordinates (theS Nmethod) to treat directional variablesApplies weighted finite-difference methodsto treat spatial variablesAli ltifltitttddA pp lies a mu lti group f ormu l a ti on t o t rea t energy d epen d enceDOORS Package(DORT/TORT) input formatExecute on a one-workstation platformExecutessimultaneously inparallelonanetworkofworkstationsExecutes simultaneously in-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.
Background
Background
- Westinghouse has performed the neutron fluenceevaluationinsupportoftheCatawbaUnit1MURusing evaluation 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 re q uests that the licensee qprovide justification for the use of RAPTOR-M3G for fluence calculations for MUR conditions, or provide an alternative fluencecalculationusinganNRCapprovedmethod.
fluence calculation using an NRC approved method.4 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponse Westinghouse RAI Response*Westinghouse/Duke are providing justification to the NRC thattheuseofRAPTORM3Gfor fluencecalculationsfor that the use of RAPTOR-M3G for fluence calculations for MUR conditions is acceptable.
- Additional Catawba Unit 1 s pecific benchmark calculations phave been done between TORT and RAPTOR-M3G
-For limiting RPV materials
-Forrepresentativefuelcycles For representative fuel cycles*Due to computer limitations with TORT, three reduced size models were used:URtEit(URE)dl(Wld06)
-U pper R eac t or E nv i ronmen t (URE) mo d e l (W e ld 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.WestinghouseRAIResponseStrategy Westinghouse 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-M3G 4 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.
Results 7 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculations Westinghouse 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-wei g hted avera g e of power distributions throu g h 54 ggpgEFPY, to provide fluenceprojection at 54 EFPY based on one
cycle calculation 8
Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculations Westinghouse RAI Response Calculations
- URE model -209 radial, 195 azimuthal, and 89 axial mesh intervals intervals TORT 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.WestinghouseRAIResponseCalculations Westinghouse RAI Response Calculations
- MRE model -209 radial, 195 azimuthal, and 85 axial mesh intervals intervals TORT 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.WestinghouseRAIResponseCalculations Westinghouse RAI Response Calculations
- LRE model -209 radial, 195 azimuthal, and 91 axial mesh intervals intervalsCombining all three reduced size models wouldbeafullcoremodelsimilarto 11 would 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.WestinghouseRAIResponseCalculations Westinghouse RAI Response Calculations
- Boundary Conditions and Extent of Applicability for the ReducedSizeModels Reduced Size ModelsParameterReduced-Size ModelUREMRELREBottom of Model
- 0.0 cm-191.206 cm-363.296 cmBottom Boundary ConditionReflectiveVoidVoidTopofModel
- 34346cm190289cm00cmTop of Model 343.46 cm 190.289 cm 0.0 cmTop Boundary ConditionVoidVoidReflective Bottom Extent of Model Applicability
- 75.0 cm-75.0cm-330.0 cm
- Dimensionsaregivenrelativetotheactivecore midplaneTop Extent of Model Applicability
- 300.0 cm75.0 cm-75.0 cmMaterials Analyzed in ModelWeld W06Weld W05Weld W04 UREWeld06 12 Dimensions are given relative to the active core midplane URE -Weld 06MRE -Weld 05LRE -Weld 04 Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.WestinghouseRAIResponseCalculationResults Westinghouse RAI Response Calculation Results*Calculated Neutron FluenceRates for Catawba Unit 1 Cycle3 Cycle 3ModelCalculated Neutron (E>1.0 MeV)FluenceRate (Flux) [n/cm 2-s]()Weld W06Weld W05Weld W04Reduced-Size Models (TORT) with TW1.06E+092.36E+101.91E+09 Reduced-SizeModels(RAPTOR
-M3G)withTW106E+09236E+10190E+09 Reduced-Size Models (RAPTOR-M3G) with TW 1.06E+09 2.36E+10 1.90E+09RAPTOR-M3GModel in WCAP-17669-NP, Rev. 0 with TW1.06E+092.36E+101.90E+09RAPTOR-M3GModelin WCAP-17669-NPRev0114E+09233E+10198E+09RAPTOR M3G Model in WCAP 17669 NP , Rev. 0 1.14E+09 2.33E+10 1.98E+09TORT and RAPTOR-M3G with TW methods give identicalresults(<1%)
13 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.WestinghouseRAIResponseCalculationResults Westinghouse RAI Response Calculation Results*Calculated Neutron FluenceRates for Catawba Unit 1 Cycle21 Cycle 21ModelCalculated Neutron (E>1.0 MeV)FluenceRate (Flux) [n/cm 2-s]()Weld W06Weld W05Weld W04Reduced-Size Models (TORT) with TW6.41E+081.54E+101.20E+09 Reduced-SizeModels(RAPTOR
-M3G)withTW640E+08154E+10120E+09 Reduced-Size Models (RAPTOR-M3G) with TW 6.40E+08 1.54E+10 1.20E+09RAPTOR-M3GModel in WCAP-17669-NP, Rev. 0 with TW6.40E+081.54E+101.20E+09RAPTOR-M3GModelin WCAP-17669-NPRev0698E+08154E+10126E+09RAPTOR M3G Model in WCAP 17669 NP , Rev. 0 6.98E+08 1.54E+10 1.26E+09TORT and RAPTOR-M3G with TW methods give identicalresults(<1%)
14 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.WestinghouseRAIResponseCalculationResults Westinghouse RAI Response Calculation Results*Calculated Neutron Fluenceafter 54 EFPY at Catawba Unit 1(Reduced-SizeModelscalculatedusingtime
-weighted 1 (Reduced Size Models calculated using time weighted average power distributions)ModelCalculated Neutron (E>1.0 MeV)
Fluence[n/cm 2]Fluence[n/cm 2]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 TW 1.05E+18 (1.07E+18)
- 2.66E+19 (2.63E+19)
- 1.83E+18 (1.86E+18)
- The projected 54 EFPY fluencevalue in the parent hesis 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+18 15TORT 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 Conclusions Conclusions
- TORT and RAPTOR-M3G produce nearly identical results, iewithin1%whenusingthesamegeometricalmodel i.e., within 1%, when using the same geometrical model and calculation control parameters
- The results from RAPTOR-M3G and TORT agree better thanthe13%uncertaintyassignedtothe calculational than the 13% uncertainty assigned to the calculationalmethodology and well within the 20% uncertainty deemed acceptable for RT PTS and RT NDT determination f f Cf*The f ast neutron fluencereported to NR C f or 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 acce p table 16 ,p Westinghouse Non-Proprietary Class 3© 2015 Westinghouse Electric Company LLC. All Rights Reserved.
Westinghouse RAI Response Calculation Conclusions Conclusions
- The in-vessel surveillance capsule and ex-vessel neutron dosimetrydatahavebeenprovidedinWCAP
-17669-NP,Rev.0, dosimetry data have been provided in WCAP 17669 NP, Rev. 0, Appendix C, the measurement-to-calculation (RAPTOR-M3G) comparisons show:
-The in-vessel dosimeters meet the +/-20% criteria for in-vessel illlRlGid1190 surve ill ance capsu l es per R egu l atory G u id e 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
conver g ence , i.e., usin g much coarser mesh onl y chan g es the g,,gygfluenceresults less than 2%.
-Using different quadrature sets (e.g., S 12vs. S 8) 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