ML060400352
| ML060400352 | |
| Person / Time | |
|---|---|
| Site: | Kewaunee  |
| Issue date: | 01/31/2006 |
| From: | Dominion Energy Kewaunee |
| To: | Office of Nuclear Reactor Regulation |
| jaffe D, NRR/DORL, 415-1439 | |
| References | |
| Download: ML060400352 (19) | |
Text
Application of Dominion Safety & Core Design Methods to Kewaunee Power Station (KPS)
Dominion Meeting with NRC Staff - 1131/06 SDominion
Dominion Meeting Participants
- K. L. Basehore, Director-Nuclear Analysis & Fuel
- C. B. LaRoe, Supervisor-Nuclear Safety Analysis
- J. R. Harrell, Supervisor-Fuel Project Engineering
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- J. C. Lautzenheiser, Nuclear Safety Analysis
- G. L. Darden, Fuel Project Engineering
- C. D. Sly, Kewaunee Licensing Engineer
- FDominiomr 2
Agenda
- Meeting and Project Objectives
- Dominion Methods to Be Applied to KPS
- Applicability Assessment Methodology & Examples
- NSSS Accident Analysis Methodology Using RETRAN
- Regulatory Processes: Utility Topical Reports & COLR
- Proposed Submittals and Schedule
- Open Discussion/Action Items Joominionw 3
Meeting & Project Objectives Meeting Objectives
- Define technical and licensing details of approach for application of Dominion methods to Kewaunee
- Obtain NRC feedback concerning: technical approach, licensing approach & schedule
- Explore submittal & review options
- Project Objectives
- Obtain NRC-approval for application of Dominion methods to Kewaunee
- NRC approval target date of 1/31/08 for support of Cycle 29 FDotminiow 4
Overview of Proposed KPS COLR Changes
- KPS COLR (prepared per TS 6.9.a.4) is maintained as Section 2.1 of KPS Technical Requirements Manual (TRIM)
- Dominion will retain W reference methods in COLR
- represents current licensing basis & remains technically applicable
- provides continuity during NRC review of Dominion methods e Change TS 6.9.a.4 to add a 'bridge' topical DOM-NAF-5-A as reference methodology document for use of Dominion methods to establish COLR limits
- DOM-NAF-5-A will describe the specific approach and framework for use of Dominion methods for KPS.
Poominioit
Key Elements of KPS Submittals to License Dominion Methods for KPS
- Topical DOM-NAF-5 -- submit mid-2006
- Statistical DNBR Statistical Design Limit quantification results
- Detailed benchmark/validation analysis results
- Detailed analysis results available for NRC review in audit meeting OR
- Submit DOM-NAF-5 Appendix A with detailed analysis
Dominion Methods to Be Applied to KPS
- Core Physics Methods
- VEP-FRD-42, Rev. 2.1 -A [Reload Nuclear Design Methodology]
- VEP-NE Rev. 0.1-A [Relaxed Power Distribution Control]
- DOM-NAF-1, Rev. 0.0-P-A [Core Management System (CMS) Reactor
- VEP-FRD-45-A [Nuclear Design Reliability Factors]
- VEP-FRD-36-A [Control Rod Worth Determination by Rod Swap Technique]
- Safety Analysis Methods
- VEP-FRD-41 -A [RETRAN NSSS Analysis]
- VEP-NE-2-A [Statistical DNBR Evaluation Methodology]
- DOM-NAF-2 [Core Thermal/Hydraulics Using VIPRE-D] -- UNDER NRC REVIEW Donnioir 7
Applicability Assessment Screening Process
- Description of each method, its purpose and key features and dependencies
- key phenomena/conditions predicted by method
- general calculational approach or assumptions
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- Identify conditions & limitations associated with each method
- regulatory limitations in NRC Safety Evaluation Reports (SERs)
- physical limitations (e.g., plant systems, plant features & conditions)
- limitations in Dominion topicals (e.g., specific modeling approaches or inherent assumptions)
- Assess each method with respect to conditions/limitations
- effort will range from written evaluations (minor) to validation and/or benchmark analyses and detailed comparison of results (involved)
PDominiont 8
Applicability Assessment Examples Candidate Method: DOM-NAF-2 [VIPRE-D]
- Evaluation of DOM-NAF-2 considered a minor effort
- VIPRE-D is VIPRE-01 with minor modifications
- Addition of proprietary vendor DNB correlations (e.g. WRB-1)
- Minor input/boutput customizations
- VIPRE-01 (with WRB-1) is the current DNB design basis tool for KPS
- KPS 14x14 fuel, plant conditions & features are within the bounds defined in DOM-NAF-2
Conclusion:
VIPRE-D is applicable to KPS for general DNB analysis, as defined in DOM-NAF-2
- Dominiow 9
Applicability Assessment Examples
- Candidate Method: DOM-NAF-1-A [CMS Reactor Physics]
- Evaluation of DOM-NAF-1 considered a moderate effort
- DOM-NAF-1 -A SER approved CMS as general core physics modeling methodology for application to Surry & North Anna
- SER indicates additional NRC review may be warranted for application of DOM-NAF-1 -A methods to a different fuel assembly lattice
- Demonstration analyses will confirm applicability for analysis of KPS 14x14 fuel lattice in these specific areas (use multiple cycles of data)
- Confirmation of Nuclear Reliability Factors (NRFs) applied to key parameter results from CMS (e.g., critical boron, ITC, rod worth)
- CASMO vs. MCNP: peaking, flux instrument reaction rates
- Comparison of SIMULATE & MCNP 2x2 assembly array predictions
- Detailed analyses made available for NRC review
Conclusion:
DOM-NAF-1 -A is applicable to KPS
- DoMninioOW 10
Applicability Assessment Examples
- Candidate Method: VEP-FRD-41 -A [RETRAN NSSS Analysis]
- Evaluation of VEP-FRD-41 -A considered an involved effort
- VEP-FRD-41 -A SER approved RETRAN for use at Surry & North Anna, plants with 3-Loop Westinghouse NSSS
- KPS fuel design & conditions are within bounds of VEP-FRD-41 -A, but behavior of 2-Loop NSSS will be evaluated
- KPS models developed in accordance with VEP-FRD-41 -A &
confirmed with selected benchmark analyses SlDominioit
NSSS Accident Analysis Methodology Using RETRAN
- VEP-FRD-41 -A documents Dominion NSSS accident analysis methodology using RETRAN-02
- VEP- FRD-41 -A methods are currently applied to SPS and NAPS UFSAR Non-LOCA transient analyses of record (AOR)
- RETRAN was approved for application to KPS NSSS accident analysis non-LOCA transients. [WPS report WPSRSEM-NP-A, Revision 3, Sep 2001]
- Westinghouse performed current USAR AOR for KPS non- LOCA transients using RETRAN-02. [Fuel Transition (Amendment 167, Apr 2003) and Stretch Uprate (Amendment 172, Feb 2004)]
Conclusion:
RETRAN-02 code is applicable to KPS--the key task involves demonstrating applicability of VEP-FRD-4 1-A methods Donminio" 12
NSSS Accident Analysis Methodology Using RETRAN
- These steps are established to demonstrate applicability of VEP-FRD-41 -A methodologies to KPS
- Define unique classes of events (RCS heatup; RCS cooldown/depressurization; reactivity excursion; loss of RCS flow; loss of secondary heat sink)
- Select one or more events from each class, based on: 1) event complexity, 2) event establishing basis for key limits of operation, 3) event uniqueness relative to VEP-FRD-41 requirements
- Perform demonstration analyses of identified events to validate capability to model key phenomena
- Verify that applicability assessment criteria are met: 1) appropriate prediction of key phenomena, 2) predicted results are technically sound with reasonable agreement with USAR analyses and/or available plant data, 3) General trends in key parameters are consistent with USAR analyses
- Detailed analyses made available for NRC review ifominioir 13
NSSS Accident Analysis Methodology Using RETRAN - Candidate Events for Benchmark Analysis
- USAR 14.1.8, Locked Rotor
- criterion 1: complex event
- criterion 3: 2-loop behavior more severe
- criterion 2: establishes KPS auxiliary feedwater flow requirements
- VEP-FRD-41 modeling verification (e.g., SG heat transfer)
- USAR 14.2.5, Rupture of a Steam Pipe
- criteria 1 & 3: complex event, with potential for 2-loop behavior to be more severe
- VEP-FRD-41 modeling verification (e.g. core inlet mixing)
ODominiow 14
Regulatory Processes: Topicals & COLR c DOM-NAF-5 will document the 'bridge' to demonstrate applicability of Dominion methods to KPS
- Approval of DOM-NAF-5 and its addition to KPS COLR is the initial step in application of Dominion methods to KPS
- Subsequent steps will follow internal procedure & use provisions of 10CFR50.59 to modify separate Dominion topical reports
- Include specific discussion in each topical to reflect the approved material and evaluations in DOM-NAF-5-A
- Publish modified versions (mods) of each topical in accordance with Dominion procedure
- Submit modified topicals to NRC for information
- This modification process is applied to all Dominion topicals that may be cited by reference in VEP-FRD-42 or in the COLR 9Dominiour 15
DOM-NAF-5 Submittal Content
- The submittal requesting approval of DOM-NAF-5 will include
- General discussion of application assessment process
- Results of executing the assessment process for each Dominion method being applied to KPS
- Commitments, as necessary, for subsequent evaluations or analyses to augment DOM-NAF-5 DOM-NAF-5 submittal is scheduled to precede the LAR requesting its addition to the COLR to provide additional time for NRC review Dominionr 16
Technical Specifications/COLR LAR Content LAR for Technical Specifications/COLR change will include
- General discussion of DOM-NAF-5 purpose and content (minimal content since DOM-NAF-5 will already have been submitted)
- Request to add DOM-NAF-5-A as reference methodology to KPS Core Operating Limits Report (COLR), TS 6.9.a.4
- Plant-specific application analysis to define DNBR Statistical Design Limit (SDL) per provisions of VEP-NE-2-A & DOM-NAF-2
- DOM-NAF-5, Appendix A documenting detailed validation analyses, if needed Plant-specific application analysis (SDL) & LAR combined in one submittal so that LAR is complete and ready for NRC review ODominioir 17
Proposed Submittals and Key Schedule Milestones
- Dominion submits DOM-NAF 6/30/06
- NRC issues SER for DOM-NAF-5-A - 9/30/07
- KPS Cycle 29 startup - Apr 2008
- Xwaominiow 18
onpen fliAq.ILQ~inn I wt W m F Action items
- Domi nior-