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Published byClement Watkins Modified over 9 years ago
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1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors
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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
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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
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4 Codes Used for Regulation System Level – TRACE and RELAP5 Containment and Severe Accident – MELCOR Component Level - FLUENT
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5 TRACE EPR Results - LBLOCA
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6 TRACE ESBWR Results - LBLOCA
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7 TRACE – GSI-191 Core Blockage
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8 FLUENT – GSI-191 Core Blockage
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9 FLUENT – ESBWR Contours of Stream Functions
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10 FLUENT – ESBWR Contours of Axial Velocity
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11 FLUENT ESBWR – Boron Injection
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12 FLUENT ESBWR – Boron Injection
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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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