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Computer Codes and Applications in the Regulatory Process

Dr. Ralph R. Landry, Senior Level Advisor at the Office of New Reactors, emphasizes the critical role of computational codes in the regulatory process. These codes, including DNS, LES, CFD, TRACE, and RELAP5, are essential for confirming licensee analyses, capturing phenomena, and identifying potential gaps in submissions. The methodologies provide insights into fluid behavior at various scales, assist in resolving generic issues, and enhance understanding of component-level behavior. Ultimately, these regulatory applications ensure safety and reliability in nuclear reactor operations.

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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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