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![Page 1: 1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors.](https://reader030.fdocuments.net/reader030/viewer/2022032722/56649cd95503460f949a334f/html5/thumbnails/1.jpg)
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Computer Codes and Applications in the Regulatory
Process
Dr. Ralph R. Landry
Senior Level Advisor
Office of New Reactors
![Page 2: 1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors.](https://reader030.fdocuments.net/reader030/viewer/2022032722/56649cd95503460f949a334f/html5/thumbnails/2.jpg)
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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
![Page 3: 1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors.](https://reader030.fdocuments.net/reader030/viewer/2022032722/56649cd95503460f949a334f/html5/thumbnails/3.jpg)
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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
![Page 4: 1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors.](https://reader030.fdocuments.net/reader030/viewer/2022032722/56649cd95503460f949a334f/html5/thumbnails/4.jpg)
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Codes Used for Regulation
• System Level – TRACE and RELAP5
• Containment and Severe Accident – MELCOR
• Component Level - FLUENT
![Page 5: 1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors.](https://reader030.fdocuments.net/reader030/viewer/2022032722/56649cd95503460f949a334f/html5/thumbnails/5.jpg)
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TRACE EPR Results - LBLOCA
![Page 6: 1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors.](https://reader030.fdocuments.net/reader030/viewer/2022032722/56649cd95503460f949a334f/html5/thumbnails/6.jpg)
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TRACE ESBWR Results - LBLOCA
![Page 7: 1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors.](https://reader030.fdocuments.net/reader030/viewer/2022032722/56649cd95503460f949a334f/html5/thumbnails/7.jpg)
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TRACE – GSI-191 Core Blockage
![Page 8: 1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors.](https://reader030.fdocuments.net/reader030/viewer/2022032722/56649cd95503460f949a334f/html5/thumbnails/8.jpg)
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FLUENT – GSI-191 Core Blockage
![Page 9: 1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors.](https://reader030.fdocuments.net/reader030/viewer/2022032722/56649cd95503460f949a334f/html5/thumbnails/9.jpg)
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FLUENT – ESBWR Contours of Stream Functions
![Page 10: 1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors.](https://reader030.fdocuments.net/reader030/viewer/2022032722/56649cd95503460f949a334f/html5/thumbnails/10.jpg)
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FLUENT – ESBWR Contours of Axial Velocity
![Page 11: 1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors.](https://reader030.fdocuments.net/reader030/viewer/2022032722/56649cd95503460f949a334f/html5/thumbnails/11.jpg)
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FLUENT ESBWR – Boron Injection
![Page 12: 1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors.](https://reader030.fdocuments.net/reader030/viewer/2022032722/56649cd95503460f949a334f/html5/thumbnails/12.jpg)
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FLUENT ESBWR – Boron Injection
![Page 13: 1 Computer Codes and Applications in the Regulatory Process Dr. Ralph R. Landry Senior Level Advisor Office of New Reactors.](https://reader030.fdocuments.net/reader030/viewer/2022032722/56649cd95503460f949a334f/html5/thumbnails/13.jpg)
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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