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WEEK I: FUNDAMENTALS OF BEST ESTIMATE PLUS UNCERTAINTY METHODOLOGIES
  • Upcoming Event:  BOKU University, Vienna (Austria), 5-16 July 2021
  • Registration deadline: May 06, 2021

                       

SUNBEAM - WEEK I: FUNDAMENTALS OF BEST ESTIMATE PLUS UNCERTAINTY METHODOLOGIES

Session I: Licensing Framework and Best Estimate Plus Uncertainty (part 1 of 2)
•    Fundamentals of Safety Assessment
•    Deterministic Safety Analysis
      o    Scope
      o    Postulated Initiating Events
      o    Acceptance Criteria
      o    Assumptions of the Analysis
      o    Computer Codes
•    Overview of the U.S. NRC Licensing Process
•    Licensing and Regulatory Requirements for Best Estimate Plus Uncertainty Applications: from Appendix K to CSAU and EMDAP
•    Approaches to Safety Analysis for Licensing of NPPs according to IAEA Safety Standards
•    IAEA Generic Reactor Safety Review (GRSR) and Lessons Learned
•    Results and Recommendations of International OECD/CSNI BEPU Programs
      o    UMS
      o    BEMUSE
      o    PREMIUM
      o    SAPIUM

Session II: Best Estimate System Thermal-Hydraulic Codes and V&V
•    Historical Evolution of LOCA Regulatory Requirements
•    System Thermal-Hydraulics Codes: Capabilities, Limitations and Uncertainties
•    Overview of Experimental Program for Assessing System Thermal-Hydraulics Codes
•    The OECD/NEA Computer Code Validation Matrix (CCVM)
      o    for Integral Test Facility (ITF)
      o    for Separate Effect Test Facility (SETF)
•    The importance of experimental uncertainty in the BEPU approach
•    The role of Verification & Validation Process in Best Estimate Plus Uncertainty Methodology Development
•    V&V for RELAP5
•    Validation Metric and Code Accuracy
      o    The FFTBM Metric for Quantifying the Accuracy of a Code Calculation
      o    Validation Metric through Predictive Modeling Methodology

Session III: Scaling Issue and Scaling Analysis
•    The Scaling Issue
•    Overview of Scaling Methodologies
      o    Power to Volume Ratio (Volumetric Scaling)
      o    Three-level Scaling Approach
      o    Triad Method Scaling Approach
      o    Hierarchical, Two-Tiered Scaling Approach (H2TS)
      o    Fractional Scaling Analysis (FSA)

      o    Dynamic Scaling Analysis (DSS)
•    Role of Scaling Analysis in EMDAP
•    Dynamic Scaling Analysis

Session IV: Sensitivity Analysis: Objectives and Methods
•    Sensitivity Analysis of Model Outputs: Principles and Issues for the BEPU Methodology
•    Statistical Methods for Sensitivity Analysis (Rank-based Methods, ANOVA Method, ...)
•    Deterministic Methods for Sensitivity Analysis (FSAP, ASAP)

Session V: Uncertainty Analysis: Objectives and Methods (part 1 of 2)
•    Relevant Topics for Developing Uncertainty Methodology
•    Approaches for Calculating Uncertainty
•    The Features of the UMAE Methodology
•    Bayesian Perspective in BEPU Licensing Analysis