ML042180089

VIPRE-D Topical Report DOM-NAF-2 Meeting with NRC

ML042180089
Person / Time
Site:	Millstone, Surry, North Anna
Issue date:	08/04/2004
From:	Dominion
To:	Office of Nuclear Reactor Regulation
References
Download: ML042180089 (28)

Text

VIPFRE-D Topic~al Report DOM-N'AF-2 ihforma don Aheting withy NIRC iZDominion

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Presen^ters

• Kerry L. Basehore - Director, and Fuel Nuclear Analysis

• Dana M. Knee - TA Supervisor, Analysis Nuclear Safety

• Dr. Sama Bilbao y Leon - Nuclear Safety Engineer and DOM-NAF-2 author

• Kurt F. Flaig - Lead Core T/H Engineer Analysis

Dominioir 2

Outline

1. Core Thermal-Hydraulics at Dominion II. VIPRE-01 Licensing History 111.

VIPRE-D is VIPRE-01 IV. DOM-NAF-2 Topical Philosophy V. VIPRE-D Modeling VI. Qualification of VIPRE-D Subchannel Model VII. Standards for Core T/H Topical Reports 3

5Dominion

IX Core Thermal Hydraulics at Dominrion e Current NRC-approved Code and Method

• COBRA-IIIC/MIT (VEP-FRD-33-A and VEP-NE-3-A)

• W-3 and WRB-1 CHF Correlations

• Current uses of COBRA-IIIC/MIT

+ Statistical & Deterministic DNB FSAR Analyses

• Steady State & Transient DNB Evaluations

• Develop Reactor Core Safety Limits for DNB Protection

+ Basis for Reactor Protection Setpoints (OTDT, OPDT, fdl)

• Code/correlation DNBR design limits

• North Anna and Surry Power Stations 4

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It Core Thermal Hydraulics at Dominion

• Basis for switching to VIPRE-01 o Fuel Vendor Independence o Industry-wide code with User's Group o Capable of analyzing PWRs o Capable of analyzing AOA/CIPS o Already approved for Westinghouse and AREVA fuel products and CHF correlations 5 Dominion

Core Thermal Hydraulics at Dominion 9 Dominion Plan for VIPRE-01 o Recover UFSAR Chapter 15 DNB analyses &

RPS setpoint analyses for North Anna with AREVA fuel o Replace COBRA-IIIC/MIT for UFSAR Chapter 14 DNB & RPS setpoint analyses for Surry with Westinghouse fuel o Incorporate additional vendor CHF correlations for advanced fuel products o Use at other Dominion plants 6

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I. Core Thermal Hydraulics at Dominlon e Dominion Implementation of VIPRE-01 o Compliance with Dominion's 1 OCFR50 Appendix B QA Program o Staff Qualification

+ 20+ years of core T/H analysis experience

+ Training on VIPRE-W with W-3 and WRB-1

+ Training on thermal-hydraulic design bases at Westinghouse facilities

+ In-house training on code enhancements W'Dominioff

S IIs VIPRE-O1 Licensing History

• VIPRE-01 developed by Battelle for EPRI from COBRA codes (including COBRA-IIIC/MIT)

+NRC SER dated May 1986 VIPRE-01 MOD-02 4Error corrections and enhancements 1 - 177 4Released April 1989

-NRC SER dated October 1993 8

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-S II. VIPRE-Ol Licensing History VIPRE-01, MOD-02.1

+ Error corrections and enhancements 178 - 231

• Released in May 2001

+ No NRC review required Recent VI PRE-01 Approved Topicals

+ Duke - VIPRE-01 + BWU CHF Correlations (2/97)

+ Westinghouse - VIPRE-01 + WRB-1, WRB-2 and WRB-2M CHF Correlations (10/99)

+ Kewaunee - VIPRE-01 + HTP CHF Correlation (9/01) 9

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/iIs VIPRE-D is VIPRE-O1

• Dominion has made NO modifications to the NRC-approved constitutive models, equations, and algorithms in VIPRE-01

• Enhancements made to VIPRE-01 MOD 2.1 under 10CFR50 Appendix B

• Vendor Proprietary CHF Correlations

• Input/Output customizations to integrate VIPRE-01 with other codes

+ Incorporate error corrections provided by code custodian after release of VIPRE-01, Mod. 2.1 10 W'Dominionr

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III. VIPRE-D is W1PREO1

• Dominion verified that each enhancement did NOT affect any of the original internal models and algorithms present in VIPRE-01

• Dominion process to customize VIPRE-01 is identical to other approved topicals

=> VIPRE-01 + CHF Correlations + Customizations

+ Verify that additions do not affect any of the original internal models and algorithms 11tDominion-

tiI VPRED is VIPREO1 O

CHF Correlations o AREVA BWU-Z (DOM-NAF-2 Appendix A) o AREVA BWU-ZM (DOM-NAF-2 Appendix A) o AREVA BWU-N (DOM-NAF-2 Appendix A) o AREVA BWU-I o Westinghouse W-3 o Westinghouse WRB-1 12

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/is VPRE-D is VIPRE-O1

• Code Customizations

-o Option to apply each CHF correlation at its applicable axial location o Checks hot channel parameters against range of validity for each CHF correlation o Increased stacked cases from 30 to 1 000 o Increased # of axial nodes from 80 to 201 o Ability to adjust radial power distribution according to partial power multiplier when iterating on power for a given MDNBR 13 DDominionf

Ie DOM-NA F2 Topical Structure

• Non-proprietary o Vendor CHF test data already at NRC o Fuel specific parameters omitted (FLC, FAHE)

• Level of detail comparable to approved VIPRE-01 topicals

• Divided in two parts:

o Main body - VIPRE-01 modeling choices o Appendixes - code/correlation DNBR design limits for fuel vendor CHF correlations 14 W'Dominion

z DNADF=2 Topical Structure e Intended Uses (Section 2. 1) oStatistical & Deterministic DNB FSAR Analyses oSteady State & Transient DNB Evaluations o Development of Reactor Core Safety Limits o Basis for Reactor Protection Setpoints oCode/correlation DNBR design limits oAnalysis of 14x1 4, 15x1 5 and 17x1 7 fuel in PWR reactors 4North Anna, Surry and plants of similar design 15

Dominion

IVNA IF-2 Topical Structure Compliance with VIPRE-01 SER (Section 2.2)

1. PWR licensing calculations with heat transfer regime up to CHF

2. CHF correlations reviewed and approved by NRC. DNBR design limits will be derived and submitted to NRC for review and approval.

3. Justification for all modeling assumptions

4. Appropriate time steps selected for transient analyses

5. Code maintained within Dominion's 1 OCFR50 Appendix B Quality Assurance program.

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I V D0 -NA F-2 Topical Structure s VIPRE-D Code Description (Section 3)

. VIPRE-D Modeling (Section 4) m Qualification of Subchannel Model (Section 5) e Appendix A: DNBR Design Limits for BWU CHF Correlations 17

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Va VPRE-D Modeling e Modeling choices described in Section 4 are consistent with industry practice and satisfy SER Restriction #3 e User instructions are not part of a Topical o VIPRE-01 User Manual fully applicable o VIPRE-D manual constructed to describe code enhancements (e.g., how to select the BWU-Z CHF correlation) 18

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MeAodln VIPRE-01 MODEL SELECTION DOM-NAF-2 Turbulent Mixing No momentum mixing Section 4.5 ABETA = 0.038 Axial Friction Losses McAdams Correlation Section 4.6 Crossflow Resistance Idel-Chik Correlation Section 4.6 Two Phase Flow and EPRI Correlations Sections 4.8 & 5.4 Heat Transfer Dittus-Boelter Correlation S4 Run Control Default Options with Parameters Courant > 1 for transients Section 4.12 19 5'~Dominiow

V VIPRE-D Modeling e Fuel Specific Parameters o Radial Nodalization - Section 4.1 method applicable to 1 4x1 4, 1 5x1 5 and 1 7x1 7 fuel o Radial Power Distribution - Section 4.4 method applicable to 1 4x1 4, 1 5x1 5 and 1 7x1 7 fuel o Axial Nodalization o Fuel Rod Modeling (dummy rod model) o Form Loss Coefficients (vendor proprietary) o CHF Correlation (vendor proprietary) o Engineering Factors (vendor proprietary 20 Dominion

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VI.

Qualification of VIPRE-D Subchannel Model

• 173 Statepoints from UFSAR Chapter 15 (Section 5.1)

+ Reactor Core Safety Limits

• Axial Offset Envelopes

• Rod Withdrawal at Power

+ Rod Withdrawal from Subcritical

• Control Rod Misalignment

+ Loss of Flow Accident

• Locked Rotor

• Main Steam Line Break (Section 5.2) 21 eDominion-

VI. Qualification of VIPRE-D Subchannel M~odel e Exercise DNB sensitivity to 4Power level, pressure and temperature mAxial power shapes

• Elevated Hot Rod Power 4Low Flow VARIABLE RANGE Pressure [psial 1860 to 2400 Power [%

66 to 135 Inlet Temperature [OF]

506.6 to 626.2 Flow []

64 to 100 FAH 1.49 to 1.945 Axial Offset [%]

-48.7 to 57.9 22

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I. Qualification of VIPRE-D Subchannel Model Benchmarked to the AREVA LYNXT code o Average Deviation in MDNBR of 0.14%

o Maximum Deviation in MDNBR of 2.2%

o Within 5% uncertainty associated to thermal-hydraulic codes 23

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-- 4 VI. Qualification of VIPRE-D Subchannel Model VIPRE-D LYNXT 1.20000 1.15000 F

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ni-7 V1. Qualification of VIPRE-D Subchannel llodel e Transient calculations (Section 5.3) o VIPRE-01 transients in EPRI NP-251 1 -CCM still applicable o VIPRE-D - demonstrate model integrity and code capability to process forcing functions o LOFA and RWAP examples oTransient MDNBR was rerun as a steady-state statepoint condition --> same result 25 WDominion

VIL Standards for Core TMH Topical Reports VIPRE-D is VIPRE-01: VIPRE-01 qualification is fully applicable

• DOM-NAF-2 includes expected uses and compliance with VIPRE-01 SER

• Dominion qualification of subchannel models consistent with approved VIPRE-01 topicals

• DOM-NAF-2 format and level of detail consistent with approved VIPRE-01 topicals 26

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VII.

Standards for Core TIH Topical Reports 9 Dominion develops DNBR design limits from test section data o COBRA/WRB-1 o VIPRE-D/BWU (Appendix A)

@ NRC expectations for qualification of CHF correlations (Appendix A) 27 WDominion

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