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Transcript of 1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor...
1
Computer Codes and Applications in the Regulatory
Process
Dr. Ralph R. Landry
Senior Level Advisor
Office of New Reactors
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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
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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
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Codes Used for Regulation
• System Level – TRACE and RELAP5
• Containment and Severe Accident – MELCOR
• Component Level - FLUENT
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TRACE EPR Results - LBLOCA
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TRACE ESBWR Results - LBLOCA
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TRACE – GSI-191 Core Blockage
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FLUENT – GSI-191 Core Blockage
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FLUENT – ESBWR Contours of Stream Functions
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FLUENT – ESBWR Contours of Axial Velocity
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FLUENT ESBWR – Boron Injection
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FLUENT ESBWR – Boron Injection
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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