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Computer Codes and Applications in the Regulatory Process

Computer Codes and Applications in the Regulatory Process. Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors. Purpose of Code Application. Confirmation of Submittals Are licensee/applicant analyses reasonable? Have submittals captured the phenomena? Exploratory

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Computer Codes and Applications in the Regulatory Process

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  1. Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors

  2. Purpose of Code Application • Confirmation of Submittals • Are licensee/applicant analyses reasonable? • Have submittals captured the phenomena? • Exploratory • Are there any hidden “cliffs” that have not been discovered? • Resolution of Generic Issues

  3. Fluid Code Types • DNS – Direct Numerical Simulation • Micro scale, only practical for low Re • LES – Large Eddy Simulation • Direct solution for large scale, models smallest scale • CFD – Computational Fluid Dynamics • Local and component scale • Turbulence models for closure • System Codes – TRACE, RELAP5 • Reliance on models and correlations

  4. Codes Used for Regulation • System Level – TRACE and RELAP5 • Containment and Severe Accident – MELCOR • Component Level - FLUENT

  5. TRACE EPR Results - LBLOCA

  6. TRACE ESBWR Results - LBLOCA

  7. TRACE – GSI-191 Core Blockage

  8. FLUENT – GSI-191 Core Blockage

  9. FLUENT – ESBWR Contours of Stream Functions

  10. FLUENT – ESBWR Contours of Axial Velocity

  11. FLUENT ESBWR – Boron Injection

  12. FLUENT ESBWR – Boron Injection

  13. Regulatory Applications of Codes • Systems codes have assisted in confirming behavior of licensee/applicant submittals • System codes have assisted in exploring generic issues and their resolution • CFD codes have given valuable insights into component-level behavior

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