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 T
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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.
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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 tys of relactrr onrditions ftr IIAJhh mthkod ;i Ised
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I I I EWII IVU I0 UO1WU 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 1 4x14 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" 1 2
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
- USAR 14.1.1 0, Loss of Normal Feedwater 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 1 OCFR50.59 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
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Action items
- Domi nior-