Correlations for flow at angles between horizontal and vertical are generated via interpolation where no experimental studies or data exist. However, careful treatment of the rotational and translational kinematics is required to accurately capture the physics of the fluid motion. It is useful to express the equations of fluid motion in the acceleratingmore » frame of reference attached to the moving craft. Transient body forces affect fluid flow in thermal-fluid machinery aboard accelerating crafts during rotational and translational accelerations. The field equations have also been modified to model reactors in a non-inertial frame, such as occur in land-based reactors during earthquakes or onboard spacecraft. By changing the magnitude of the gravitational vector through user input, RELAP 5-3D can model reactors on a space station or the moon. However, it can also model reactors in other inertial and accelerating frames of reference. RELAP 5-3D is typically used to model stationary, land-based reactors.
Further refinements will be made to the model as final as-built drawings are released and when system characterization data are available for benchmarking the input model. The current model is described in detail. High Temperature Test Facility Preliminary RELAP 5-3D Input Model DescriptionĪ RELAP 5-3D input model is being developed for the High Temperature Test Facility at Oregon State University. Therefore it can be concluded, that proposed IJS conversion procedure was successfully demonstrated on the BETHSY integral test facility input model.
The overall calculated results obtained with TRACE using the converted RELAP 5 model were close to experimental data and comparable to RELAP 5/MOD3.3 calculations. The application of the IJS procedure for conversion of BETHSY input model showed that it is important to perform the steps in proper sequence. The selected BETHSY 6.2TC test was 15.24 cm equivalent diameter horizontal cold leg break in the reference pressurized water reactor without high pressure and low pressure safety injection. For calculations of the selected BETHSY 6.2TC test the RELAP 5/MOD3.3 Patch 4 and TRACE V 5.0more » Patch 1 were used. The IJS conversion procedure consists of eleven steps and is based on the use of SNAP. The purpose of this study is to demonstrate the Institut 'Josef Stefan' (IJS) conversion procedure from RELAP 5 to TRACE input model of BETHSY facility. Much of efforts have been done in the past to develop the RELAP 5 input decks. Nuclear Regulatory Commission comes with a graphical user interface called Symbolic Nuclear Analysis Package (SNAP). The TRAC/ RELAP Advanced Computational Engine (TRACE) advanced, best-estimate reactor systems code developed by the U.S. IJS procedure for RELAP 5 to TRACE input model conversion using SNAP
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