ML042180089
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 ihformadon Aheting withy NIRC iZDominion
-,a I c Presen^ters
- Kerry L. Basehore - Director, Nuclear Analysis and Fuel
- Dana M. Knee - TA Supervisor, Nuclear Safety Analysis
- Dr. Sama Bilbao y Leon - Nuclear Safety Analysis Engineer and DOM-NAF-2 author
- Kurt F. Flaig - Lead Core T/H Engineer 2
- Dominioir
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
IXCore Thermal Hydraulicsat 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
- 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 _Domiinion
It Core Thermal Hydraulicsat 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 Hydraulicsat 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 :pominiow
I. Core Thermal Hydraulics at Dominlon e Dominion Implementation of VIPRE-01 o Compliance with Dominion's 10CFR50 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 WDominionf
-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 ;Dominiowr
/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
-i N, 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 CHF O 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 -Dominioit
/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 1000 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-NAF2 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
IVNAIF-2 Topical Structure Compliance with VIPRE-01 SER (Section 2.2)
- 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 10CFR50 Appendix B Quality Assurance program.
16 WDominion-
I V D0 -NAF-2 Topical Structure s VIPRE-D Code Description (Section 3)
. VIPRE-D Modeling (Section 4) mQualification of Subchannel Model (Section 5) e Appendix A: DNBR Design Limits for BWU CHF Correlations 17
!-rominion-
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 !o iin
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 14x1 4, 15x1 5 and 17x1 7 fuel o Radial Power Distribution - Section 4.4 method applicable to 14x1 4, 15x1 5 and 17x1 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
7fI.,dp ~~
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. Qualificationof 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 !4Dominiow
I. Qualificationof VIPRE-D SubchannelModel 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 .WDominiow
,fr -- 4 VI. Qualification of VIPRE-D SubchannelModel VIPRE-D LYNXT 1.20000 F I T 1.15000 I 1 4 NEGA11VE SHAPES I. %P p Ot I Y l A L 0
P
-o 1.05000-I E
. W V V m h ~ 0i aL- - ;; j s p . nqn q qww- 1.1111wolw - .11111111 i &r % r -uw -ef lww w -; _
- a 9
c 0.95000 4- 4-0.90000 4 4 1.55 COSINE 0.85000 4- 4 n arxvn S S U S I T S V5 S 5 1 V.W9W
- S I II I . . I . .
0 10 20 30 40 50 60 70 80 90 10 110 12D 130 140 150 160 170 180 STATEPOINT 24
-eDominion
ni- 7 V1. Qualificationof 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 Standardsfor 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 !Dominion
VII. Standardsfor 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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