ML21167A127: Difference between revisions

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{{#Wiki_filter:LICENSING MODERNIZATION PROJECT FOR OPERATING REACTORS Matt Humberstone June 2021
{{#Wiki_filter:}}
 
PURPOSE 1PHASE FFR Scope 2
PHASE Regulatory Support Discussion        Discussion        Discussion Feasibility        Scope Overview          Path              Proposals Forward Results
 
FFR SCOPE
* Feasibility
* Limited Scope Phase 1
* Level 3 PRA - Internal Events
* Expanded Insights
* More Event Sequences
* Level 3 PRA - External Phase 2    Events
 
OBJECTIVES: LMP for Operating Reactors                                    1 Limited Resource                                                            2  4 project to support 3
future NRC needs                                                                  5 jumped over the lazy Yes, the LMP methodology is feasible for LWRs dog. LMP Feasibility Used the LMP methodology with the L3PRA Pilot LMP methodology    model results Identified LMP challenges (Centerline Identify Issues/Challenges dose, crediting evacuations, accident family limitations, etc.)
Use L3PRA results      LWR safety profile in-line with NLWR target Risk-Insights on LWRs Shared Progress/Results
* RMT briefing
* OEDO Communicate
* ACRS briefing
* Final Report
* PWROG
* PSA paper
* RIC digital exhibit
* Two-pager
 
Communication: Slide 2 Technical Approach Risk-Informed and Severe Accident Research Performance-Based LWR Experience                                                                              Non-LWR licensing LMP Frequency - Consequence Curve Event Sequence Frequency 1.E+01 1.E+00 1.E-01 1.E-02 NRC Level 3                                          1.E-03                        NEI 18-04                      LMP PRA Model 1.E-04 Methodology 1.E-05 1.E-06 1.E-07 1.E-08 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 TEDE at EAB (rem)
 
Level 3 PRA (L3PRA) Process Plant Damage      Release Cutsets ~50,000    States (PDS) -368 Categories -16 6
 
Severe Accidents at Nuclear Power Plants Risk and                01 Consequence Uncertainty Analysist 06 MELCOR          02 Accident Consequence Code System (MACCS) 05                      03 Source Term Dosimetry and                                and Health Effects                            Radionuclide 04 release Transport and Dispersion
 
Communication: Slide 5 Release Categories                        5 Largest Dose Categories (orange) 6 16 Release Middle Dose B        Categories Categories (gray) 5 Lowest Dose Categories (blue)
 
Release Category Contributions Dose Contributions Frequency Contributions Largest Dose Middle Dose Low Dose 9
 
Basic LMP Frequency-Consequence Curve 1.E+01 Increasing Risk Event Sequence Frequency 1.E+00                          10 CFR 20 Selection of Licensing                                                                                                      Significance Iso-Risk Line ANTICIPATED Basis Events (LBEs)                                1.E-01    OPERATIONAL OCCURANCE                                      10 CFR 50.34 Dose Limit (AOO) REGION 1.E-02 DESIGN 1.E-03  BASIS EVENT Safety Classification                                          (DBE)
REGION of Structures,                                  1.E-04 Systems, and                                                                                                              Individual Risk 1.E-05                            Design BEYOND DESIGN Components (SSCs)                                            BASIS EVENT            Objective                              QHO (Prompt)
(BDBE) REGION 1.E-06 1.E-07 Determination of                                            Decreasing Risk                  EPA PAG Significance                    Dose Limit Defense-in-depth                                  1.E-08 (DID) Adequacy                                      1.E-02        1.E-01      1.E+00        1.E+01        1.E+02        1.E+03        1.E+04 TEDE(rem) at the Exclusion Area Boundary 10
 
LMP Frequency - Consequence Comparison Lowest Dose Middle Dose Largest Dose 11
 
Reports/Papers                      LMP Methodology
* Final Report                      can be used beyond  Insights for
* PSA paper                          the original intent  NLWR licensing
* Two pager Operating Communication                                                            Reactor Safety
* RMT briefing                                                          Insights
* ACRS briefing
* PWROG briefing
* OEDO
* RIC digital exhibit NWLR Licensing Insight
* Understand LMP upfront                                                  Opportunities
* 30-day TEDE, EAB, etc.
* NLWR Licensing LMP Challenges
* Risk-Informing CH 15
* Is TEDE the centerline maximum dose? (averaged???)                                                      Accident Analysis
* Is evacuation ignored?
* Licensing
* Limitations on accident families?
* Oversight Operating Reactors
* In-line with NLWR guidance
* Consistent with historical                PHASE 1 CONCLUSIONS perspective
 
Communication: Slide 5 PHASE 2 L3PRA A          EXPANDED INSIGHTS External Events FLEX ACCIDENT    Sequence Review B          SEQUENCES    Deeper Understanding Uncertainty
 
RES SUPPORT (LMP use in regulatory framework)
Risk-Informed Now                                                          Regulator
* Rely on deterministic PROPOSALS
* Risk-Inform CH 15 analysis
* Rely on risk-insights approaches
* 2 Approaches
* More efficient reviews
* May not explicitly rely on
* NLWR Licensing Support
* Focus on risk-significant risk-insights accidents
* Develop tools to better focus on risk-significant 14aspects
 
CH 15 Accident Analysis Research Options
* Use LMP F-C chart
* Categorize accidents
* Distance from the F-C Approach 1            target
* Map consequences to Level 1/LERF risk metrics
* Find Correlations Approach 2
* Use Level 1/LERF risk metrics to categorize
 
NEXT STEPS/QUESTIONS PHASE 2 of the LMP for Operating Reactors          A B          Program Office Engagement Continue Communication Effort
* Briefings
* Conferences                  C}}

Revision as of 08:52, 17 January 2022

2 - Lmp for Operating Reactors
ML21167A127
Person / Time
Issue date: 06/16/2021
From: Matthew Humberstone
NRC/RES/DRA
To:
Vasavada S
Shared Package
ML21167A163 List:
References
Download: ML21167A127 (16)
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