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Workshop II

Introduction to the RELAP5-3D Thermal-Hydraulics Code

Instructor: Gary W. Johnsen, RELAP5-3D Program Manager, Idaho National Laboratory Saturday April 1st 10:30 am – 5:00 pm Lunch is included

This half-day class will introduce participants to the RELAP5-3D thermal-hydraulic systems computer code. RELAP5-3D is the latest version in the RELAP code series code developed at the Idaho National Laboratory for the US Nuclear Regulatory Commission and the Department of Energy. Key features of the code include:

  • Multidimensional hydrodynamic model (Cartesian or cylindrical)

  • Integrated multidimensional nodal kinetics model based on NESTLE

  • Graphical user interface

  • Functional under UNIX and Windows platforms

RELAP5-3D has been extensively used for the analysis of light water reactors of various designs, including Generation II and III pressurized and boiling water reactors of both Western and Russian designs. Specific applications of the code have included simulations of transients in light water reactor (LWR) systems, such as loss of coolant, anticipated transients without scram (ATWS), and operational transients such as loss of feedwater, loss of offsite power, station blackout, and turbine trip. Most recently, capabilities have been added for the analysis of Generation IV reactor designs. The class will provide an overview of the code’s models and capabilities and will include “hands-on” exer- cises. Personnel interested in transient and accident analysis of current and future reactor designs should find the class informative.

NOTE: Portions of the class are “hands on”. Participants are encouraged to bring PC

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